Consulta: subjectFacets:"Caffeine"
Registros recuperados: 43
Data/hora: 05/06/2024 10:10:26

EFFECT OF THE POSTHARVEST PROCESSING METHOD ON THE BIOCHEMICAL COMPOSITION AND SENSORY ANALYSIS OF ARABICA COFFEE
Provedor de dados: 70
Autores: Rodriguez,Yeison F. B.; Guzman,Nelson G.; Hernandez,Joel G.
ABSTRACT The objective of this work was to study the influence of two postharvest processing methods on the biochemical composition and sensory analysis of a Colombian specialty coffee. For this purpose, coffee beans (Coffea arabica) of the Castillo variety were collected and processed using the wet and semi-dry methods, and the drying process was conducted in a sun drier prototype with a plastic parabolic cover, with a maximum drying air temperature of 50 °C; green coffee beans were managed according to the official Specialty Coffee Association cupping protocol and roasted to a medium and dark degree. Physicochemical determinations (pH, color, titratable acidity, caffeine content, and chlorogenic acid quantification) in green coffee and roasted coffee...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caffeine; Coffee roasting; Coffee processing; Cup quality; Chlorogenic acids.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000200177

Effects of caffeine and used coffee grounds on biological features of Aedes aegypti (Diptera, Culicidae) and their possible use in alternative control
Provedor de dados: 74
Autores: Laranja,Alessandra Theodoro; Manzatto,Antonio José; Campos Bicudo,Hermione Elly Melara de.
Caffeine and used coffee grounds completely blocked the development of Aedes aegypti in the early stages, in treatments with the concentrations 1.0 mg/mL and 50 mg/mL, respectively. More advanced stages and even adults were obtained in lower concentrations of both substances, enabling observations to be made of mortality rate, longevity and esterase patterns. The experiments involved treatments using either eggs or 3rd instar larvae (L3), with or without the addition of fish food. Mortality rates prior to the adult stage and adult longevity were significantly different in the comparisons among treatments, in every kind of experiment, but in those using L3 larvae, their percentages were smaller. Observations of the time of larva and adult onset suggested...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aedes aegypti; Caffeine; Used coffee grounds; Mortality; Longevity; Esterases; Alternative control.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000400004

Teor de cafeina em sementes secas de guarana Paullinia cupana var. Sorbilis.
Provedor de dados: 14
Autores: GARCIA, T. B.; NASCIMENTO FILHO, F. J. do; COSTA JUNIOR. R. C.; AQUINO, C. T. de.
Visando caracterizar clones de guaraná quanto ao teor de cafeína, foram coletadas amostras compostas de sementes secas de 67 genótipos, em experimentos localizados no município de Maués, AM, e submetidas a análise espectofotométrica.
Tipo: Outras publicações técnicas (INFOTECA-E)
Palavras-chave: Paullinia cupana var; Sorbilis; Brasil; Amazonas; Genotypes.; Cafeína; Análise Química; Clone; Espectrofotometria; Guaraná; Genótipo; Semente.; Caffeine; Seeds.
Ano: 1991
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/665208

Development of microbial and chemical MST tools to identify the origin of the faecal pollution in bathing and shellfish harvesting waters in France
Provedor de dados: 5
Autores: Gourmelon, Michele; Caprais, Marie-paule; Mieszkin, Sophie; Marti, Romain; Wery, Nathalie; Jarde, E.; Derrien, Marc; Jadas-hecart, A.; Communal, P. Y.; Jaffrezic, A.; Pourcher, A. M.
The microbiological quality of coastal or river waters can be affected by faecal pollution from human or animal sources. An efficient MST (Microbial Source Tracking) toolbox consisting of several host-specific markers would therefore be valuable for identifying the origin of the faecal pollution in the environment and thus for effective resource management and remediation. In this multidisciplinary study, after having tested some MST markers on faecal samples, we compared a selection of 17 parameters corresponding to chemical (steroid ratios, caffeine, and synthetic compounds), bacterial (host-specific Bacteroidales, Lactobacillus amylovorus and Bifidobacterium adolescentis) and viral (genotypes I-IV of F-specific bacteriophages, FRNAPH) markers on...
Tipo: Text
Palavras-chave: Microbial source tracking; Faecal pollution; Bacteroidales; Bifidobacterium adolescentis; Lactobacillus; FRNA bacteriophages; Steroids; Caffeine.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00016/12710/9690.pdf

Genetic investigations on the caffeine and chlorogenic acid relationship in an interspecific cross between Coffea liberica dewevrei and C-pseudozanguebariae
Provedor de dados: 5
Autores: Ky, Chin-long; Barre, Philippe; Noirot, Michel.
The objective of the paper was to identify the number of major loci explaining caffeine content in coffee seeds. Investigations were based on previously published results: (1) Caffeine binds to chlorogenic acids in a 1:1 molecular ratio; (2) Between species, the caffeine content is correlated to the chlorogenic acid content; (3) Only a part of chlorogenic acids is bound to caffeine. Especially, the content ratio between caffeine and chlorogenic acids varied between species. For identifying the number of major loci, a quantitative trait locus (QTL) approach was carried out using an interspecific cross between two highly differentiated species-Coffea liberica dewevrei and Coffea pseudozanguebariae, the latter being a caffeine-free species. As main finding,...
Tipo: Text
Palavras-chave: Coffea; Chlorogenic acids; Caffeine; QTL; Interspecific cross.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00152/26298/24429.pdf

Quantitative genetic analysis of methylxanthines and phenolic compounds in mate progenies
Provedor de dados: 86
Autores: Cardozo Junior,Euclides Lara; Donaduzzi,Carmen Maria; Ferrarese-Filho,Osvaldo; Friedrich,Juliana Cristhina; Gonela,Adriana; Sturion,José Alfredo.
The objective of this work was to determine the contents of methylxanthines, caffeine and theobromine, and phenolic compounds, chlorogenic and caffeic acids, in 51 mate progenies (half-sib families) and estimate the heritability of genetic parameters. Mate progenies were from five Brazilian municipalities: Pinhão, Ivaí, Barão de Cotegipe, Quedas do Iguaçu, and Cascavel. The progenies were grown in the Ivaí locality. The contents of the compounds were obtained by high performance liquid chromatography (HPLC). The estimation of genetic parameters by the restricted maximum likelihood (REML) and the prediction of genotypic values via best linear unbiased prediction (BLUP) were obtained by the Selegen - REML/BLUP software. Caffeine (0.248-1.663%) and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ilex paraguariensis; Caffeine; Caffeic acid; Chlorogenic acid; Genetic parameters; Theobromine.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010000200008

Leaf Morphoanatomy and Biochemical Variation on Coffee Cultivars Under Drift Simulation of Glyphosate
Provedor de dados: 87
Autores: REIS,L.A.C.; CARVALHO,F.P.; FRANÇA,A.C.; FRANCINO,D.M.T.; PINTO,N.A.V.D.; FREITAS,A.F.
ABSTRACT: The most widely used herbicide in coffee crop is glyphosate, it inhibits the biosynthesis of secondary metabolites, responsible for structures and substances of plant defense. This work aimed to evaluate the morphoanatomy, total phenols, flavonoids and caffeine in leaves of Arabica coffee submitted to different sub-doses of glyphosate. The treatments were combinations of three coffee cultivars (MGS Travessia, Oeiras MG 6851 and Catuaí IAC 144) and five sub-doses of glyphosate (0.0, 57.6, 115.2, 230.4 and 460.8 g a.e. ha-1). The total thickness of the leaf blade, thickness of adaxial and abaxial epidermis, palisade and spongy parenchyma, in addition to the total phenol, total flavonoids and caffeine were evaluated 30 days after spraying. Catuaí...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Herbicide drift; Coffea arabica; Epidermis; Parenchyma; Caffeine; Flavonoid.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100336

Nutritional Contributions of Nonalcoholic Beverages to the U.S. Diet: 1998-2003
Provedor de dados: 31
Autores: Dharmasena,   Senarath; Capps,   Oral, Jr.; Clauson,   Annette L.
Using data from U.S. households over the period 1998 to 2003, we examine economic and demographic factors affecting per capita daily intake of calories, calcium, caffeine, and vitamin C derived from the consumption of nonalcoholic beverages. Our study demonstrates the effectiveness of the USDA 2000 Dietary Guidelines in reducing such caloric and nutrient intake.
Tipo: Conference Paper or Presentation
Palavras-chave: Nonalcoholic beverages; Nutritional elements; Calories; Calcium; Vitamin C; Caffeine; And econometric analysis; Consumer/Household Economics; Food Consumption/Nutrition/Food Safety.
Ano: 2009
URL: http://purl.umn.edu/46386

Chemical composition, acetylcholinesterase inhibitory and antifungal activities of Pera glabrata (Schott) Baill. (Euphorbiaceae)
Provedor de dados: 88
Autores: Cardoso-Lopes,Elaine Monteiro; Paula,Daisy Maria Bentes de; Barbo,Fausto Erritto; Souza,Amanda de; Blatt,Cecília Terumi Teradaira; Torres,Luce Maria Brandão; Young,Maria Cláudia Marx.
Pera glabrata (Schott) Baill. was selected for this study after showing a preliminary positive result in a screening of Atlantic Forest plant species in the search for acetylcholinesterase inhibitors and antifungal compounds. The bioassays were conducted with crude ethanol extract of the leaves using direct bioautography method for acetylcholinesterase and antifungal activities. This extract was partitioned with hexane, chloroform and ethyl acetate solvents. The active chloroform fraction was submitted to silica gel chromatography column affording 12 groups. Caffeine, an alkaloid, which showed detection limits of 0.1 and 1.0 µg for anticholinesterasic and antifungal activities, respectively, was isolated from group nine. After microplate analyses, only...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 9-hydroxy-4-megastigmen-3-one; Biological activities; Caffeine; Euphorbiaceae.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042009000400019

The inclusion of coffee in commercial layer diets
Provedor de dados: 89
Autores: Mendes,LR; Silva,RB; Bueno,CFD; Couto,FAP; Dias,AN; Fernandes,V; Faria Filho,DE.
This experiment aimed at evaluating the effect of the dietary inclusion of caffeinated and decaffeinated coffee on the performance and internal and external egg quality of commercial layers. One hundred and twenty 25-week-old Hy-line Brown layers, with 1575 ± 91 average body weight, were distributed according to a completely randomized experimental design with three treatments (control, 1.2% caffeinated coffee, or 1.2% decaffeinated coffee) of five replicates of eight birds each. The inclusion of 1.2% caffeinated coffee was calculated to supply 6mg caffeine per kg body weight, which is considered a moderate dose. The applied treatments did not influence (p&amp;gt;0.05) feed intake, egg production, egg weight, egg mass, feed conversion ratio, Haugh units,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Layers; Caffeinated coffee; Decaffeinated coffee; Caffeine.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2013000200010

Changes in composition, antioxidant content, and antioxidant capacity of coffee pulp during the ensiling process
Provedor de dados: 96
Autores: Rios,Teodulo Salinas; Torres,Teresa Sánchez; Cerrilla,María Esther Ortega; Hernández,Marcos Soto; Cruz,Antonio Díaz; Bautista,Jorge Hernández; Cuéllar,Cuauhtémoc Nava; Huerta,Humberto Vaquera.
The objective of the present study was to determine the nutritive value, the presence of antioxidant compounds, and the antioxidant capacity of coffee pulp ensiled or non-ensiled. Dry matter (DM), crude protein (CP), ash, acid detergent fiber (ADF), neutral detergent fiber (NDF), and lignin, as well as the antioxidant compounds present in coffee pulp and their antioxidant capacity, were determined. A completely randomized design was used. Data were analyzed by analysis of variance. Ensiling of coffee pulp increased the CP content from 98.6 to 111.6 g kg−1 DM, NDF from 414.6 to 519.5 g kg−1 DM, ADF from 383.9 to 439.3 g kg−1 DM, and lignin from 122.9 to 133.6 g kg−1 DM. Caffeine decreased from 5.72 to 5.02 mg g−1 DM. Three antioxidant compounds were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caffeic; Caffeine; Chlorogenic; Gallic acid; Silage; Trolox.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014000900492

Semen quality and reproductive performance of boars kept in pens containing conventional coffee husk as a floor covering
Provedor de dados: 96
Autores: Teles,Mariele Cristina; Pereira,Bárbara Azevedo; Rocha,Luiz Gustavo Pessoa; Resende,Carla Oliveira; Rodrigues,Valéria Vânia; Pereira,Luciano José; Rodríguez-Gil,Joan Enric; Zangeronimo,Márcio Gilberto.
ABSTRACT The objective of this study was to evaluate the putative effects of the use of coffee husk as floor covering on boar semen quality. Sixteen boars were divided into two groups. The first group was held in a conventional system with a compact floor. The second group was kept on a compact floor covered with coffee pods. The experimental period was 60 days. Levels of caffeine and chlorogenic acid in the insemination doses (ID) before and after 96 h of storage at 15 °C and the reproductive performance (litter size and rate of return to estrus) of these doses after their utilization in a standard artificial insemination protocol were evaluated. The ID from the animals kept in pens containing the coffee pods contained 25.4±8.7 µg/mL of caffeine, whereas...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant; By-product; Caffeine; Pig; Sperm.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982016000700365

Catabolism of caffeine and purification of a xanthine oxidade responsible for methyluric acids production in Pseudomonas putida L
Provedor de dados: 59
Autores: Yamaoka-Yano,Dirce Mithico; Mazzafera,Paulo.
Caffeine catabolism and a xanthine oxidase involved in the alkaloid breakdown were studied in Pseudomonas putida L, a strain displaying high ability to grow on this substrate. Cells cultured with unlabelled caffeine and 14C labeled caffeine and xanthine showed that this alkaloid was broken-down via theobromine/paraxanthine -&amp;gt; 7-methylxanthine -&amp;gt; xanthine -&amp;gt; uric acid -&amp;gt; allantoin -&amp;gt; allantoic acid. Methyluric acids were formed from the oxidation of theobromine, paraxanthine and 7-methylxanthine, although no bacterial growth was observed on these compounds, indicating that this might be due to a wide substrate specificity of xanthine oxidase. This was confirmed by activity staining in PAGE where activity was observed with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caffeine; Methylpurines; Methyluric acids; Pseudomonas; Xanthine oxidase.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37141999000100013

Ploidy level and caffeine content in leaves of Coffea
Provedor de dados: 63
Autores: Silvarolla,Maria Bernadete; Mazzafera,Paulo; Lima,Marinez Muraro Alves de; Medina Filho,Herculano Penna; Fazuoli,Luiz Carlos.
Several species of Coffea and varieties of C. arabica differing in chromosome number had their caffeine content determined in the leaves. For Coffea arabica var. "Angustifolia", var. "Caturra" and var. "Icatu", it was observed caffeine decrease from the haploid (2n = 22) to tetraploid leaves (2n = 44). Caffeine in the tetraploid "Angustifolia" was decreased by 50% when compared to the haploid. Caffeine reduction was also observed in leaves of C. canephora var. "Kouilou" as chromosome number was increased (2n = 22 ® 2n = 44). In this case, caffeine in the leaves of the diploid genotype was close to 4 times higher than in the tetraploid. On the other hand it was observed an increase of the alkaloid when the chromosome number was doubled in the C. canephora...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caffeine; Coffea; Leaves; Ploidy.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300021

Avaliação de compostos não-voláteis em diferentes cultivares de cafeeiro produzidas na região sul de Minas Gerais - DOI: 10.4025/actasciagron.v31i1.6629
Provedor de dados: 1
Autores: Malta, Marcelo Ribeiro; EPAMIG; Chagas, Sílvio Júlio de Rezende; EPAMIG.
O presente trabalho teve como objetivo avaliar os teores de trigonelina, ácidos clorogênicos (5-ACQ) e cafeína em grãos de diferentes cultivares de cafeeiro (Coffea arabica L.). As cultivares avaliadas foram coletadas na Fazenda Experimental da Epamig em Lavras, Estado de Minas Gerais, no ano agrícola de 2005/2006. O delineamento experimental utilizado foi um inteiramente casualizado constando de oito cultivares de café com três repetições. Foram avaliadas as cultivares: Oeiras MG 6851, Acaiá Cerrado MG 1474, Catuaí Vermelho IAC 99, Rubi MG 1192, Topázio MG 1190, Mundo Novo IAC 379/19, Catucaí Amarelo 2 SL e Catuaí Amarelo IAC 62. Após a colheita dos cafés por derriça manual no pano, estes foram lavados e submetidos ao processo de descascamento e...
Palavras-chave: 5.01.03.04-0 Produção de Mudas Coffea arabic; Melhoramento; Composição química; Ácido clorogênico; Cafeína; Trigonelina. Coffea Arabica; Breeding; Chemical composition; Chlorogenic acids; Caffeine; Trigonelline.
Ano: 2009
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/6629

Effects of nitrogen and potassium on the chemical composition of coffee beans and on beverage quality
Provedor de dados: 1
Autores: Clemente, Junia Maria; Martinez, Herminia Emilia Prieto; Alves, Leonardo Corrêa; Finger, Fernando Luíz; Cecon, Paulo Roberto.
The ratio of nitrogen (N) to potassium (K) is important in the production of specialty coffees because the relative amounts of N and K can either suppress the formation or increase the concentration of compounds that are essential to the flavor and aroma of specialty coffees. The purpose of this study was to evaluate the effect of different N:K ratios (w/w) and K doses on the cup quality of coffee. The concentrations of chemical compounds essentials to achieve good flavor and aroma, the N and K contents, and the caffeine contents of coffee leaves and beans were evaluated in this study. The N:K ratio and the K dose were found to be important factors in cup quality, the best quality corresponding to an N:K ratio of 1:1.56. The best cup quality was obtained...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fisiologia de Plantas Cultivadas Coffea arabica L.; Coffee; Caffeine; Fertilization Nutrição Mineral de Plantas.
Ano: 2015
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/19063

Direct inhibitory effect of caffeine on viability, synthesis activity and gene expression in cultures of chondrocytes extracted from the articular cartilage of rats
Provedor de dados: 45
Autores: Reis,A.M.S.; Oliveira,K.P.; Paula,I.H.F.; Silva,A.P.; Tarragô,J.F.; Ocarino,N.M.; Serakides,R.
ABSTRACT The aim of this study was to evaluate the effect of concentrations of caffeine on the viability, synthesis activity and gene expression in cultures of chondrocytes. Extracted articular cartilage from the femurs and tibias of 15 Wistar rats at three days old to isolate chondrocytes. Chondrocytes were cultured in chondrogenic medium (control) or supplemented with caffeine (0.5, 1.0, 2.0mM). Cell viability, alkaline phosphatase activity and collagen synthesis were assessed using colorimetric assays at 7, 14, 21 days. The chondrocyte cultures of all groups grown under coverslips were stained with hematoxylin-eosin to determine the percentage of cells/field and with PAS, safranin O, alcian blue to determine the percentage of matrix chondrogenic/field...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rats; Caffeine; Chondrocytes; Chondrogenesis.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352019000200509

DNA injury induced by 5-aminouracil and caffeine in G2 checkpoints path of higher plant cells
Provedor de dados: 47
Autores: Del Campo,A.; Bracho,M.; Marcano,L.; Guíñez,J.; De la Torre,C.
This work evaluated the qualitative and quantitative cellular changes induced by treatment with 5-aminouracil (5-AU) and a combination of 5-AU and caffeine in plant cells in relation to DNA damage, repaired damage, and residual damage. As biological material, Allium cepa L. root tips were used, grown in filtered water, in darkness, with aeration at constant temperature of 25 °C ± 0.5. Cell populations were synchronized using 5 mM caffeine in order to study the effects of 5-AU and caffeine/5-AU combined treatment on the DNA content and their incidence in the entrance to mitosis. The results showed a delay in the G2 period due to induced DNA damage by the 5-AU and caffeine/5-AU combined treatment, shown by aberrant metaphases, anaphases and telophases. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 5-aminouracil; G2 checkpoints; Caffeine.
Ano: 2005
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452005000200003

Roles of nibrin and ATM/ATR kinases on the G2 checkpoint under endogenous or radio-induced DNA damage
Provedor de dados: 48
Autores: Marcelain,Katherine; de la Torre,Consuelo; González,Patricio; Pincheira,Juana.
Checkpoint response to DNA damage involves the activation of DNA repair and G2 lengthening subpathways. The roles of nibrin (NBS1) and the ATM/ATR kinases in the G2 DNA damage checkpoint, evoked by endogenous and radio-induced DNA damage, were analyzed in control, A-T and NBS lymphoblast cell lines. Short-term responses to G2 treatments were evaluated by recording changes in the yield of chromosomal aberrations in the ensuing mitosis, due to G2 checkpoint adaptation, and also in the duration of G2 itself. The role of ATM/ATR in the G2 checkpoint pathway repairing chromosomal aberrations was unveiled by caffeine inhibition of both kinases in G2. In the control cell lines, nibrin and ATM cooperated to provide optimum G2 repair for endogenous DNA damage. In...
Tipo: Journal article
Palavras-chave: Ataxia-telangiectasia; ATM; ATR kinases; Caffeine; G2 checkpoint; Nibrin (Nbs1); Nijmegen breakage syndrome (NBS).
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602005000200007

Modulation by caffeine of calcium-release microdomains in frog skeletal muscle fibers
Provedor de dados: 48
Autores: VERGARA,JULIO L; DIFRANCO,MARINO.
The effects of caffeine on the process of excitation-contraction coupling in amphibian skeletal muscle fibers were investigated using the confocal spot detection technique. This method permits to carefully discriminate between caffeine effects on the primary sources of Ca2+ release at the Z-lines where the triads are located and secondary actions on other potential Ca Release sources. Our results demonstrate that 0.5 mM caffeine potentiates and prolongs localized action-potential evoked Ca2+ transients recorded at the level of the Z-lines, but that 1mM only prolongs them. The effects at both doses are reversible. At the level of the M-line, localized Ca2+ transients displayed more variability in the presence of 1 mM caffeine than in control conditions. At...
Tipo: Journal article
Palavras-chave: Excitation-contraction coupling; Caffeine; Confocal spot detection; Calcium transients; Frog skeletal muscle; Calcium microdomains.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000300017

Characterisation of AC1: a naturally decaffeinated coffee
Provedor de dados: 53
Autores: Benatti,Luciana Benjamim; Silvarolla,Maria Bernadete; Mazzafera,Paulo.
We compared the biochemical characteristics of the beans of a naturally decaffeinated Arabica coffee (AC1) discovered in 2004 with those of the widely grown Brazilian Arabica cultivar "Mundo Novo" (MN). Although we observed differences during fruit development, the contents of amino acids, organic acids, chlorogenic acids, soluble sugars and trigonelline were similar in the ripe fruits of AC1 and MN. AC1 beans accumulated theobromine, and caffeine was almost entirely absent. Tests on the supply of [2-14C] adenine and enzymatic analysis of theobromine synthase and caffeine synthase in the endosperm of AC1 confirmed that, as in the leaves, caffeine synthesis is blocked during the methylation of theobromine to caffeine. The quality of the final coffee...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea arabica; Caffeine; Decaffeination; Beverage quality.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052012000200001

Mineral nutrition and caffeine content in coffee leaves
Provedor de dados: 53
Autores: MAZZAFERA,PAULO.
The effect of nutrient supply on the caffeine content of coffee (Coffea arabica L.) leaves was investigated. Seeds were germinated in nutrient-agar media lacking N, P, K, Ca, Mg, S, Zn, B or Mo. The control treatment contained all essential nutrients. The caffeine concentration was determined seven months after seed sowing when the seedlings have 3 to 4 pair of leaves. The omission of K induced the highest caffeine content in the leaves (24.5 g.kg-1). Caffeine in the control treatment was 21.9 g.kg -1. Absence of P induced the lowest content, 17.5 g.kg-1.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Caffeine; Coffea arabica L.; Mineral nutrition.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051999000200018

Hydroxypropylcellulose controlled release tablet matrix prepared by wet granulation: effect of powder properties and polymer composition
Provedor de dados: 52
Autores: Teixeira,Antonio Zenon Antunes.
The aim of this study was to attain 100% drug release of caffeine after 24 h from hydroxypropylcellulose (HPC) tablet matrices and to investigate the effect of co-excipient. Physical properties of the powders were evaluated and suggested for a wet granulation process. The tablet containing caffeine was formulated by different weight ratios of hydrophilic polymers. The results of polymer evaluation confirmed that the increase of HPC level with the same drug content significantly decreased the rate of drug release. The presence of co-polymer excipients carboxymethylcellulose (CMC) and polyvinylpyrrolidone (PVP) in the tablet matrix was also investigated. The release rate was also controlled by low levels of CMC (&lt;10%) while PVP did not show any...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Controlled release; Caffeine; Hydroxypropylcellulose (HPC); Polyvinylpyrrolidone (PVP); Carboxymethylcellulose (CMC); Lactose.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000100021

Sobre a Padronização de um Método Prático Para a Dosagem da Cafeína
Provedor de dados: 52
Autores: Bührer,Nilton E.
In this work the author puts in evidence a practical and at the same time rapid method for the determination of the cafein quantity in erva-mate, that may be utilized to perfection in food and industrial analyses or others that not demand scientific rigour. The author presents a description of the method and makes a comparison with the classical method of Grandval-Lajoux, showing that the differences between the one and the other are practically nil. In conclusion, the result of the three analyses of the same sample of erva-mate, made by the Grandval-Lajoux method are cited, show that the same differences appear as those shown between the rapid method suggested by the author and the classical method. In this case, the maximum difference was 0,06% and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caffeine; Erva-mate; Caffeine assay.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132001000500007

The influence of caffeine and thymol on the survival, growth and reproduction of Subulina octona (Brugüière, 1789) (Mollusca, Subulinidae)
Provedor de dados: 52
Autores: Ferreira,Paula; Soares,Geraldo Luiz Gonçalves; D'ávila,Sthefane; Bessa,Elisabeth Cristina de Almeida.
Subulina octona is a terrestrial snail which serves as an intermediate host for the parasites. It is also an agricultural pest. The aim of this work was to assess, during 120 days, the effects of caffeine and thymol at 2.5 g/L and 5 g/L on the hatchability, survival after hatching, growth and reproduction of S. octona under the laboratory conditions. A total of 240 eggs, 240 juveniles aged 10-day-old, and 240 aged 30-day-old were tested. The results showed that thymol (at 2.5 g/L and 5 g/L) and caffeine (at 5 g/L) acted as ovicides. In the 10-day-old juveniles, caffeine at 5 g/L caused 25% mortality and at 2.5 g/L it caused 30% mortality. Thymol at 2.5 and 5 g/L caused 20 and 22.5% mortality, respectively. In the 30-day-old juveniles, caffeine at 5 g/L...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caffeine; Thymol; Molluscicide; Subulina octona; Snail-terrestrial.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000400018

Caffeine formation by suspension cultures of Coffea dewevrei
Provedor de dados: 52
Autores: Sartor,Rosana Mary; Mazzafera,Paulo.
The low caffeine content in leaves of C. dewevrei (~ 0.5 mg/g) is due to a low biosynthesis associated with a fast degradation. On the other hand, high biosynthesis and low degradation confer a higher content (~ 8 mg/g) in leaves of C. arabica. In this work it was observed that cell cultures of C. dewevrei recovered the ability to synthesize caffeine almost in similar levels of C. arabica cultures. Tracer experiments with labelled carbon dioxide showed a significant accumulation of radioactivity in caffeine and metabolites, indicating an active biosynthesis. When the cultures were fed with labelled caffeine most of the radioactivity was recovered in caffeine, indicating that although active, degradation was not so efficient as in leaves, and therefore,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffee; Caffeine; Cell suspension culture; Methylxanthines.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132000000100009

Stability of phenolic compounds and antioxidant capacity of regular and decaffeinated coffees
Provedor de dados: 52
Autores: Vicente,Silvio José Valadão; Queiroz,Yara Severino; Gotlieb,Sabina Léa Davidson; Torres,Elizabeth Aparecida Ferraz da Silva.
This study compared the regular and decaffeinated coffees in relation to antioxidant capacity, levels of some antioxidant molecules and stability of these parameters over a six-month period under different storage conditions. The regular coffee samples analyzed right after the industrial production showed higher antioxidant capacity (ORAC and DPPH), the same levels of phenolic compounds and higher levels of phenolic acids than decaffeinated coffee. After six months, the closed packs of both the grades kept under vacuum at 20°C did not show significant changes from the initial results; the open packs stored at 4°C showed small but statistically significant reductions and the open packs stored at 20°C showed higher and statistically significant losses (p...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffee; Antioxidant capacity; Phenolic compounds; Caffeine; ORAC; DPPH.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132014000100016

Spectrophotometric determination of tannins and caffeine in preparations from Paullinia cupana var. sorbilis
Provedor de dados: 52
Autores: Pelozo,Maria Inez de Godoy; Cardoso,Mara Lane Carvalho; Mello,João Carlos Palazzo de.
The present work was designed to quantify the caffeine and total polyphenols in the extractive solution and the granulated form from the seeds of Paullinia cupana var. sorbilis, by the spectrophotometric method. The method showed linearity for the caffeine and polyphenols in the range of 5-25 µg/ml and 2.4-5.6 µg/ml respectively. The solutions of the semipurified fraction (EPA) and granulated form (GRA) showed linear responses in the range of 0.288-0.672 and 0.4-1.2 µg/ml, respectively. The precision and accuracy were determined for the EPA solution at a concentration of 100 µg/ml. The spectrophotometric method performed well in quantifying the caffeine and total polyphenols.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caffeine; Paullinia cupana; Total polyphenols; Spectrophotometric quantification assay.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000300002

Influence of integral and decaffeinated coffee brews on metabolic parameters of rats fed with hiperlipidemic diets
Provedor de dados: 52
Autores: Gomes,Júlia Ariana de Souza; Faria,Bruno Generoso; Silva,Viviam de Oliveira; Zangerônimo,Márcio Gilberto; Miranda,José Rafael; Lima,Adriene Ribeiro de; Pereira,Rosemary Gualberto Fonseca Alvarenga; Pereira,Luciano José.
The objective of this study was to evaluate the influence of integral and decaffeinated coffee brews (Coffea arabica L and C. canephora Pierre) on the metabolic parameters of rats fed with hyperlipidemic diet. Thirty male Wistar rats (initial weight of 270 g ± 20 g) were used in the study, which were divided into six groups five each. The treatments were normal diet, hyperlipidemic diet, hyperlipidemic diet associated with integral coffee arabica or canephora brews (7.2 mL/kg/day) and hyperlipidemic diet associated to decaffeinated arabica, or canephora brews, using the same dosage. After 41 days, performance analyses were conducted.The rats were then euthanized and the carcasses were used for the analysis of dried ether extract and crude protein....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lipids; Adipocytes; Hyperlipidemia; Caffeine; Decaffeination.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132013000500015

Coffee has hepatoprotective benefits in Brazilian patients with chronic hepatitis C even in lower daily consumption than in American and European populations
Provedor de dados: 55
Autores: Machado,Silmara Rodrigues; Parise,Edison Roberto; Carvalho,Luciana de.
The potential role of coffee as a hepatoprotective substance for chronic liver diseases has been widely discussed. Our main aim was to evaluate the effect of coffee intake regarding clinical, biochemical tests and liver biopsy data in treatment naïve patients with chronic hepatitis C. One hundred and thirty-six patients with chronic hepatitis C, diagnosed through liver biopsy, or by means of clinical, ultrasound or endoscopic signs of cirrhosis, were assessed by determination of biochemical tests, metabolic and morphological alterations. Food frequency was scrutinized by using a structured questionnaire. Coffee intake represented more than 90% of the total daily caffeine, and the 75th percentile was 4-Brazilian coffee-cup/day (&gt;255mL/day or &gt;123mg...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffee; Caffeine; Hepatitis C; Fibrosis.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702014000200170

Bovine serum albumin potentiates caffeine- or ATP-induced tension in human skinned skeletal muscle fibers
Provedor de dados: 56
Human skinned muscle fibers were used to investigate the effects of bovine serum albumin (BSA) on the tension/pCa relationship and on the functional properties of the Ca2+-release channel of the sarcoplasmic reticulum (SR). In both fast- and slow-type fibers, identified by their tension response to pSr 5.0, BSA (0.7-15 µM) had no effect on the Ca2+ affinity of the contractile proteins and elicited no tension per se in Ca2+-loaded fibers. In contrast, BSA (&amp;gt;1.0 µM) potentiated the caffeine-induced tension in Ca2+-loaded fibers, this effect being more intense in slow-type fibers. Thus, BSA reduced the threshold caffeine concentration required for eliciting detectable tension, and increased the amplitude, the rate of rise and the area under the curve...
Palavras-chave: Calcium-release channel; Sarcoplasmic reticulum; Human muscle fiber; Bovine serum albumin; Caffeine.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997000500017

Effects of caffeine on learning and memory in rats tested in the Morris water maze
Provedor de dados: 56
Autores: Angelucci,M.E.M.; Cesário,C.; Hiroi,R.H.; Rosalen,P.L.; Cunha,C. Da.
We studied some of the characteristics of the improving effect of the non-specific adenosine receptor antagonist, caffeine, using an animal model of learning and memory. Groups of 12 adult male Wistar rats receiving caffeine (0.3-30 mg/kg, ip, in 0.1 ml/100 g body weight) administered 30 min before training, immediately after training, or 30 min before the test session were tested in the spatial version of the Morris water maze task. Post-training administration of caffeine improved memory retention at the doses of 0.3-10 mg/kg (the rats swam up to 600 cm less to find the platform in the test session, P&lt;=0.05) but not at the dose of 30 mg/kg. Pre-test caffeine administration also caused a small increase in memory retrieval (the escape path of the rats...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Memory; Learning; Caffeine; Methylxanthines; Adenosine receptor antagonist; Morris water maze.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002001000013

Effects of caffeine on time to exhaustion in exercise performed below and above the anaerobic threshold
Provedor de dados: 56
Autores: Denadai,B.S.; Denadai,M.L.D.R.
Controversy still exists concerning the potential ergogenic benefit of caffeine (CAF) for exercise performance. The purpose of this study was to compare the effects of CAF ingestion on endurance performance during exercise on a bicycle ergometer at two different intensities, i.e., approximately 10% below and 10% above the anaerobic threshold (AT). Eight untrained males, non-regular consumers of CAF, participated in this study. AT, defined as the intensity (watts) corresponding to a lactate concentration of 4 mM, was determined during an incremental exercise test from rest to exhaustion on an electrically braked cycle ergometer. On the basis of these measurements, the subjects were asked to cycle until exhaustion at two different intensities, i.e.,...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Caffeine; Anaerobic threshold; Endurance; Lactate; Perceived exertion.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998000400017

Comparison of the quantification of caffeine in human plasma by gas chromatography and ELISA
Provedor de dados: 56
Autores: Carregaro,A.B.; Woods,W.E.; Tobin,T.; Queiroz-Neto,A.
In the present study we evaluated the precision of the ELISA method to quantify caffeine in human plasma and compared the results with those obtained by gas chromatography. A total of 58 samples were analyzed by gas chromatography using a nitrogen-phosphorus detector and routine techniques. For the ELISA test, the samples were diluted to obtain a concentration corresponding to 50% of the absorbance of the standard curve. To determine whether the proximity between the I50 of the standard curve and that of the sample would bring about a more precise result, the samples were divided into three blocks according to the criterion of difference, in modulus, of the I50 of the standard curve and of the I50 of the sample. The samples were classified into three...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Gas chromatography; ELISA; Caffeine; Plasma; Quantification.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001000600019

Caffeine intake by patients with autosomal dominant polycystic kidney disease
Provedor de dados: 56
Autores: Vendramini,L.C.; Nishiura,J.L.; Baxmann,A.C.; Heilberg,I.P.
Because caffeine may induce cyst and kidney enlargement in autosomal dominant polycystic kidney disease (ADPKD), we evaluated caffeine intake and renal volume using renal ultrasound in ADPKD patients. Caffeine intake was estimated by the average of 24-h dietary recalls obtained on 3 nonconsecutive days in 102 ADPKD patients (68 females, 34 males; 39 ± 12 years) and compared to that of 102 healthy volunteers (74 females, 28 males; 38 ± 14 years). The awareness of the need for caffeine restriction was assessed. Clinical and laboratory data were obtained from the medical records of the patients. Mean caffeine intake was significantly lower in ADPKD patients versus controls (86 vs 134 mg/day), and 63% of the ADPKD patients had been previously aware of caffeine...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Polycystic kidneys; ADPKD; Cyclic AMP; Caffeine; Nutrition; Renal volume.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2012000900007

Inhibition of the sarcoplasmic reticulum Ca2+ pump with thapsigargin to estimate the contribution of Na+-Ca2+ exchange to ventricular myocyte relaxation
Provedor de dados: 56
Autores: Bassani,R.A.; Bassani,J.W.M.
Relaxation in the mammalian ventricle is initiated by Ca2+ removal from the cytosol, which is performed by three main transport systems: sarcoplasmic reticulum Ca2+-ATPase (SR-A), Na+-Ca2+ exchanger (NCX) and the so-called slow mechanisms (sarcolemmal Ca2+-ATPase and mitochondrial Ca2+ uptake). To estimate the relative contribution of each system to twitch relaxation, SR Ca2+ accumulation must be selectively inhibited, usually by the application of high caffeine concentrations. However, caffeine has been reported to often cause changes in membrane potential due to NCX-generated inward current, which compromises the reliability of its use. In the present study, we estimated integrated Ca2+ fluxes carried by SR-A, NCX and slow mechanisms during twitch...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Myocardium; Relaxation; Calcium fluxes; Sodium-calcium exchanger; Sarcoplasmic reticulum calcium ATPase; Caffeine.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003001200014

Effects of caffeine on the electrophysiological, cognitive and motor responses of the central nervous system
Provedor de dados: 56
Autores: Deslandes,A.C.; Veiga,H.; Cagy,M.; Piedade,R.; Pompeu,F.; Ribeiro,P.
Caffeine is the most consumed psychoactive substance in the world. The effects of caffeine have been studied using cognitive and motor measures, quantitative electroencephalography (qEEG) and event-related potentials. However, these methods are not usually employed in combination, a fact that impairs the interpretation of the results. The objective of the present study was to analyze changes in electrophysiological, cognitive and motor variables with the ingestion of caffeine, and to relate central to peripheral responses. For this purpose we recorded event-related potentials and eyes-closed, resting EEG, applied the Stroop test, and measured reaction time. Fifteen volunteers took caffeine (400 mg) or placebo in a randomized, crossover, double-blind...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Quantitative electroencephalography; P300; Caffeine; Cognitive and motor measures; Psychostimulants.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005000700011

Effect of caffeine and tannins on cultivation and fructification of Pleurotus on coffee husks
Provedor de dados: 58
Autores: Fan,Leifa; Soccol,Andréa Thomaz; Pandey,Ashok; Vandenberghe,Luciana Porto de Souza; Soccol,Carlos Ricardo.
The objective of this work was to study the effect of caffeine and tannins on Pleurotus sp. cultivation and to evaluate the feasibility of using coffee husks as substrate for mushroom cultivation. Eight strains of P. ostreatus and two strains of P. sajor-caju were screened on a medium prepared from agar extract of coffee husk. Based on best mycelial growth and biomass production, the strain P. ostreatus LPB 09 was selected for detailed studies. With the increase of caffeine concentration, the mycelial growth and the biomass production decreased, and no growth was observed when concentration of caffeine was 2500 mg/L. Furthermore, Pleurotus did not degrade the caffeine, but absorbed it. Tannin under 100 mg/L in the medium stimulated the growth of mycelia,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cultivation; Pleurotus; Caffeine; Tannin; Detoxification.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822006000400003

Caffeine degradation by Rhizopus delemar in packed bed column bioreactor using coffee husk as substrate
Provedor de dados: 58
Autores: Tagliari,Cristiane Vanessa; Sanson,Raquel K.; Zanette,André; Franco,Telma Teixeira; Soccol,Carlos Ricardo.
Various microorganisms including bacteria, yeast and fungi can degrade caffeine. There are few publications about caffeine degradation pathway in filamentous fungi, mainly by solid-state fermentation (SSF). Studies were carried out on degradation of caffeine and their metabolites by filamentous fungi in SSF using coffee husk as substrate. The purpose of this work was to investigate the caffeine degradation pathway by Rhizopus delemar in packed bed column fermenter and to compare this degradation metabolism with glass flasks fermentation. The methylxanthines were quantified by HPLC analysis. The experiments were realized with the optimized conditions in previous experiments: pH 6.5, 28ºC, inoculation rate 10(6) spores/g substrate, aeration rate 60 mL/min...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Decaffeination; Fermentation; Caffeine; Theophylline; Bioreactor; Filamentous fungi.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822003000500035

Neuroprotective and MAOB inhibitory effects of a series of caffeine-8-thioglycolic acid amides
Provedor de dados: 60
Autores: Kasabova-Angelova,Alexandra; Kondeva-Burdina,Magdalena; Mitkov,Javor; Georgieva,Maya; Tzankova,Virginia; Zlatkov,Alexander.
The effects of new derivatives of caffeine-8-thioglycolic acid (100 µM) on isolated rat brain synaptosomes, human neuroblastoma cell line SH-SY5Y and human recombinant MAOB enzyme (hMAOB) (1 µM) were evaluated. Most of the compounds, administered alone, didn’t show statistically significant neurotoxic effects on SH-SY5Y, when compared to the control (non-treated cells). Of all studied structures JTA-2Ox, JTA-11, JTA-12 and JTA-13 decreased cell viability. In combination with 6-hydroxydopamine (6-OHDA) (100 µM), only JTA-1 and JTA-2 revealed neuroprotective effects, stronger than those of caffeine. All compounds administered alone revealed, neurotoxic effects on synaptosomes, as compared to non-treated synaptosomes. JTA-1, JTA-2 and JTA-3 showed lowest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neuroprotection; Caffeine; Synaptosomes; SH-SY5Y; HMAOB.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502020000100529

Nanoemulsion containing caffeine for cellulite treatment: characterization and in vitro evaluation
Provedor de dados: 60
Autores: Freire,Thamires Batello; Dario,Michelli Ferrera; Mendes,Otávio Gil; Oliveira,Andressa Costa de; Vetore Neto,Alberto; Faria,Dalva Lucia Araújo de; Silva,Vânia Rodrigues Leite e; Baby,André Rolim; Velasco,Maria Valéria Robles.
The Ginoide Hydrolipodystrophy (GHLD), commonly known as cellulite, occurs in 80-90% of the female population after the puberty period and comes from a metabolic modification in the cutaneous adipose tissue. Caffeine has been used in topical formulations due to its lipolytic action. We studied a nanoemulsion (F3) containing caffeine with two surfactants (oleth-3 and oleth-20) by emulsification method by phase inversion temperature inversion (PIT). The polydispersion indices (PDI) showed the reduced deviation of 0.1. The mean droplet size was ~ 40 nm. The evaluated constant of Ostwald, in the refrigerator condition was the most favorable during the stability test. In the In Raman spectroscopy assay, the caffeine bands found in F3 were compatible with those...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cellulite; Caffeine; Gynoid hydrolipodystrophy; Nanoemulsion; Permeation.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502019000100567

Metabolism of alkaloids in coffee plants
Provedor de dados: 61
Autores: Ashihara,Hiroshi.
Coffee beans contain two types of alkaloids, caffeine and trigonelline, as major components. This review describes the distribution and metabolism of these compounds. Caffeine is synthesised from xanthosine derived from purine nucleotides. The major biosynthetic route is xanthosine -&gt; 7-methylxanthosine -&gt; 7-methylxanthine -&gt; theobromine -&gt; caffeine. Degradation activity of caffeine in coffee plants is very low, but catabolism of theophylline is always present. Theophylline is converted to xanthine, and then enters the conventional purine degradation pathway. A recent development in caffeine research is the successful cloning of genes of N-methyltransferases and characterization of recombinant proteins of these genes. Possible biotechnological...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea; Caffeine; Purine alkaloids; Pyridine alkaloids; Theobromine; Trigonelline.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202006000100001

Phenolic compounds, methylxanthines and antioxidant activity in cocoa mass and chocolates produced from "witch broom disease" resistant and non resistant cocoa cultivars
Provedor de dados: 64
Autores: Leite,Paula Bacelar; Maciel,Leonardo Fonseca; Opretzka,Luiza Carolina França; Soares,Sergio Eduardo; Bispo,Eliete da Silva.
The "witch broom disease" caused by the fungus called Moniliophthora perniciosa is one of the most important cocoa diseases in Latin America, causing around 70% production reduction in the southern Bahia. In attempt to solve the problem, many cultivars resistant to the disease have been recommended to farmers. On the other hand, the chocolate flavour is composed by many compounds whose formation depends on the genetic background, environment where cocoa is grown and processing operations. Therefore, this work aimed at determining the monomeric phenolic compounds, methylxanthines and antioxidant activity of cocoa mass and dark chocolate from cocoa cultivars resistant to "witch broom disease" and non resistant to the disease. The total phenolic compounds in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Functional food; Theobromine; Caffeine; Epicatechin; Catechin.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542013000300007