Consulta: subjectFacets:"Phytochemistry"
Registros recuperados: 13
Data/hora: 10/06/2024 16:03:20

A method to assess algicidal activity of microalgal extracts coupling microalgae produced in stirred closed photobioreactor operating in continuous with pulse amplitude modulated (PAM) fluorometry
Provedor de dados: 5
Autores: Menguy, Eva; Dumontet, Vincent; Coulombier, Noémie; Meriot, Vincent; Le Dean, Loic; Barthelemy, Vanille; Jauffrais, Thierry.
We describe in the present study a quick and reliable method based on chlorophyll a fluorescence to assess putative algicidal effect of different microalgal extracts. We couple microalgal production under chemostat cultivation mode to continuously produce a given microalgae species (e.g. Dunaliella salina in this study) at a stable physiological state to ease comparison between extracts tested; with a non-destructive method based on chlorophyll a fluorescence. Pulse amplitude modulated (PAM) fluorometry was used to assess over time the effect of different microalgal crude extracts on the efficiency of the photosystem II (PSII) of a tested microalgae (Dunaliella salina). • Microalgal production at stationary phase in stirred closed photobioreactor (PBR)...
Tipo: Text
Palavras-chave: Bioassay; Cytoxicity; Microalgae; Quantum efficiency; Fv/Fm; Non photochemical quenching; NPQ; Electron transport rate; Phytochemistry; Anti algal.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00643/75524/76400.pdf

Principaux taxons ligneux de la cosmétopée tropicale : une analyse bibliographique
Provedor de dados: 5
Autores: Ansel, Jean-luc; Butaud, Jean-francois; Raharivelomanana, Phila.
"Cosmetopoiea" refers to popular uses of plants for traditional cosmetic and body care that have always existed in many countries and cultures over the world since centuries, but this concept is still very poorly documented under the form of written reports. We report herein on a first assessment on cosmetopoiea from tropical regions, which consists in reviewing the available literature data (related to ethnobotany and pharmacopoeia) in order to highlight the tropical trees and the taxa mostly used in traditional cosmetic or dermatology and, for some of them, treated as examples, to describe briefly their chemical composition and biological activities.
Tipo: Text
Palavras-chave: Cosmetopoiea; Lignified taxa; Tropical region; Ethnobotany; Phytochemistry; Biological activities.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00664/77569/79534.pdf

Biological properties of medicinal plants: a review of their antimicrobial activity
Provedor de dados: 80
Autores: Silva,NCC; Fernandes Júnior,A.
Plants have been used for thousands of years to flavor and conserve food, to treat health disorders and to prevent diseases including epidemics. The knowledge of their healing properties has been transmitted over the centuries within and among human communities. Active compounds produced during secondary vegetal metabolism are usually responsible for the biological properties of some plant species used throughout the globe for various purposes, including treatment of infectious diseases. Currently, data on the antimicrobial activity of numerous plants, so far considered empirical, have been scientifically confirmed, concomitantly with the increasing number of reports on pathogenic microorganisms resistant to antimicrobials. Products derived from plants may...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Medicinal plants; Phytochemistry; Antimicrobial activity; Plant extracts; Essential oils; Synergism.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992010000300006

A revision of Eupatorium (Compositae: Eupatorieae) from Michoacan
Provedor de dados: 85
Autores: Garcia Sanchez,E; Ramirez Lopez,CB; del Rio Torres,REN; Martinez Pacheco,MM.
An important study in species of the genus Eupatorium, that inhabits other parts of the world, was conducted in the search for new molecules with pharmacological activities, thus showing that it is a potential source of novel secondary metabolites. We reviewed the number of Eupatorium species that have been described in the State of Michoacan, and that can be available for harvesting, to make a phytochemical screening. It was found that 69 Eupatorium spp are growing in 69% of the Michoacan territory. Within this group there are ten species used in Mexican traditional medicine. It was evident the difficulty in taxonomic classifying these species since several Eupatorium spp have synonyms. It appeared that the number of native members should be reduced in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity; Eupatorium; Phytochemistry; Michoacan; Terpenes.
Ano: 2011
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572011000200004

Phytochemistry and quantification of polyphenols in extracts of the Asteraceae weeds from Diamantina, Minas Gerais state, Brazil
Provedor de dados: 87
Autores: Petacci,F.; Tavares,W.S.; Freitas,S.S.; Teles,A.M.; Serrão,J.E.; Zanuncio,J.C.
Asteraceae weeds are rich in chemicals that have biological and pharmaceutical activities. The aims of this work were to describe the phytochemistry and quantify the polyphenols in ethanol extracts from leaves of 12 species of Asteraceae weeds collected in Diamantina, Minas Gerais State, Brazil. The screening of Asteraceae extracts revealed the presence of tannins, steroids, triterpenes, anthocyanins, and flavonoids. The total phenolic content was high in extracts of Lychnophora ericoides (147.97 ± 2.66), Lepidaploa lilacina (141.11 ± 1.99), and Eremanthus elaeagnus (134.61 ± 7.81) and low in extracts of Lychnophora ramosissima (32.65 ± 0.70), and Lychnophora sp. (54.03 ± 0.73). Extracts of Asteraceae weeds from Diamantina could have potential for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Asteraceae; Campos rupestres; Diamantina; Pesticides; Phytochemistry; Polyphenols.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582012000100002

Characterization of cycloartanol triterpene isolated from dichloromethane extract of Pedilanthus tithymaloides
Provedor de dados: 98
Autores: Cabrera Suárez,Hirán; Cuellar Cuellar,Armando; Pita,Roberto Carlo.
Introduction: Pedilanthus tithymaloides is known as ítamo real and it has been previously reported as an alternative to treatment of oral cavity virus infections. Objective: to explain procedures to characterize one of the major compounds isolated from dichloromethane extracts of Pedilanthus tithymaloides (L.) Poit (leaves). Methods: it was obtained cycloartanol from dichloromethane extract modifying polarity of the solvents with methanol and by increasing polarity to extract, they were used chromatography technique and spectroscopic of nuclear magnetic resonance H+ and 13C to characterize this compounds. Results: phytochemical studies showed quality parameters that were similar to average limits in the use of majority of medicinal plants except total...
Tipo: Journal article
Palavras-chave: Pedilanthus tithymaloides; Cycloartanol; Triterpene; Itamo real; Phytochemistry.
Ano: 2011
URL: http://scielo.sld.cu/scielo.php?script=sci_arttext&pid=S1028-47962011000400006

Caracterización de ácidos grasos de hojas de Pedilanthus tithymaloides (L.) Poit.
Provedor de dados: 98
Autores: Cabrera Suárez,Hirán; Cuellar Cuellar,Armando.
INTRODUCCIÓN: Pedilanthus tithymaloides (L.) Poit. es utilizado en medicina tradicional pero existen pocos estudios sobre su composición química. OBJETIVO: identificar los metabolitos presentes en el extracto de menor polaridad realizado a las hojas de P. tithymaloides. MÉTODOS: se procedió al tratamiento del material vegetal según los estudios farmacognósticos realizados previamente y se emplearon técnica de cromatografía de placa delgada, cromatografía de columna y cromatografía gaseosa acoplada a masa, para la caracterización de los componentes aislados de una de las fracciones obtenida por cristalización fraccionada a partir del extracto clorofórmico de las hojas de esta especie. RESULTADOS: se pudo identificar por mediación de la cartoteca del equipo...
Tipo: Journal article
Palavras-chave: Fitoquímica; Pedilanthus tithymaloides; Plantas medicinales; Phytochemistry; Pedilantlhys tithymaloides; Medicinal plants.
Ano: 2009
URL: http://scielo.sld.cu/scielo.php?script=sci_arttext&pid=S1028-47962009000100004

Can the Apparency Hypothesis explain the selection of medicinal plants in an area of caatinga vegetation? A chemical perspective
Provedor de dados: 39
Autores: Alencar,Nélson Leal; Araújo,Thiago Antonio de Sousa; Amorim,Elba Lúcia Cavalcanti de; Albuquerque,Ulysses Paulino de.
This scientific note examines the ability of the apparency hypothesis to explain the selection of medicinal plants by members of a rural community located in the Caatinga dryland region of Pernambuco state. A total of 61 plants considered to be medicinal were examined phytochemically to test the premises of this hypothesis. It was concluded that apparency does not completely explain our findings.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ethnobotany; Phytochemistry; Traditional botanical knowledge; Traditional pharmacopeia.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062009000300033

Anatomical, phytochemical and histochemical study of Solidago chilensis Meyen
Provedor de dados: 42
Autores: SOUZA,DOUGLAS M.F. DE; SÁ,RAFAELA D.; ARAÚJO,EVANI L.; RANDAU,KARINA P.
ABSTRACT Solidago chilensis Meyen, belonging to the family Asteraceae, is a plant native to South America and the only representative of the genus in Brazil. This species is popularly known as “arnica” and is used to treat bruises, muscle pain and inflammation. The objective of this work was to contribute to the pharmacognostic standardization of S. chilensis. Cross-sections were obtained, by freehand, for microscopic analysis of root, stem and leaf; for these parts of the plant maceration was also performed according to the method of Jeffrey. For the leaf were still made paradermal sections, scanning electron microscopy analysis, phytochemical and histochemical tests. Thus, it was determined anatomical features useful for diagnosis of the species which,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anatomy; Arnica; Asteraceae; Histochemistry; Phytochemistry; Solidago chilensis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502107

Studies on the biocidal and cell membrane disruption potentials of stem bark extracts of Afzelia africana (Smith)
Provedor de dados: 48
Autores: AKINPELU,DAVID A; AIYEGORO,AYOBAMI O; OKOH,ANTHONY I.
We had recently reported antibacterial activity in the crude extract of the stem bark of Afzelia africana (Akinpelu et al., 2008). In this study, we assessed the biocidal and cell membrane disruption potentials of fractions obtained from the crude extract of the plant. The aqueous (AQ) and butanol (BL) fractions exhibited appreciable antibacterial activities against the test bacteria. The minimum inhibitory concentrations of the AQ and BL fractions ranged between 0.313 and 2.5 mg/ml, while their minimum bactericidal concentrations varied between 0.625 and 5.0 mg/ml. Also, the AQ fraction killed about 95.8% of E. coli cells within 105 min at a concentration of 5 mg/ml, while about 99.1% of Bacillus pumilus cells were killed by this fraction at the same...
Tipo: Journal article
Palavras-chave: Afzelia africana; Antibacteria; Phytochemistry; Killing rate; Protein leakage.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000300008

Phytochemical and morpho-anatomical study of the vegetative organs of Psychotria fractistipula L.B.Sm., R.M. Klein &amp;amp; Delprete (Rubiaceae)
Provedor de dados: 60
Autores: Oliveira,Camila Freitas de; Oliveira,Vinicius Bednarczuk; Bobek,Vanessa Barbosa; Rech,Katlin Suellen; Betim,Fernando Cesar Martins; Dias,Josiane de Fatima Gaspari; Zanin,Sandra Maria Warumby; Miguel,Obdulio Gomes; Miguel,Marilis Dallarmi.
Psychotria fractistipula L.B.Sm, R.M. Klein &amp; Delprete (Rubiaceae) is found in the existing Atlantic Forest in the South of Brazil, in the Paraná and Santa Catarina States. The members of Rubiaceae are characterized chemically by the presence of alkaloids, some pharmacological properties of which include antifungal, antibacterial, analgesic, antioxidant, antimutagenic, and antiviral activities. In this study, we report the results of anatomical, morphological, and histochemical analyses of the leaves and stems of the Rubiaceae family member, P. fractistipula. The anatomical analysis involved of light microscopy and scanning electron microscopy. Morpho-anatomical and histochemical characterization were made using standard methodology. The isolated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Psychotria; Morpho-anatomical; Phytochemistry.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502020000100565

Extraction of &amp;#947-oryzanol from rice bran
Provedor de dados: 64
Autores: Heidtmann-Bemvenuti,Renata; Nora,Náthali Saião; Badiale-Furlong,Eliana.
γ-oryzanol, a phytochemical, has antioxidant activities and potential health benefits. In this study, we aimed to develop a method for extracting high amounts of γ-oryzanol from rice bran and for verifying its stability in different solvents. Of the 5 methods under investigation, the one that yielded the highest γ-oryzanol content was further improved by using a central composite rotational design (DCCR - 2(4), including 8 tests in axial conditions and 4 central points, totaling 28 trials). The parameters under study were temperature, time, volume, and the ratio of hexane:isopropanol. High γ-oryzanol content (13.98 mg.g-1) was obtained by using the following extraction conditions: 40° C, 40 min, and 75 mL hexane:isopropanol (1:3). The limits of detection...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant; Spectrophotometer; Stability; Phytochemistry.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000600008

Maceration extraction conditions for determining the phenolic compounds and the antioxidant activity of Catharanthus roseus (L.) G. Don
Provedor de dados: 64
Autores: Cacique,Ane Patrícia; Barbosa,Érica Soares; Pinho,Gevany Paulino de; Silvério,Flaviano Oliveira.
ABSTRACT Catharanthus roseus(L.) G. Don is a medicinal plant known for its important constituent aromatic compounds. In the literature, no detailed studies elucidating the methods of extraction of phenolic compounds for this species are available. Therefore, the present study was aimed at evaluating the maceration parameters for determining the total phenols content in C. roseus. The parameters of plant mass, extraction phase composition, homogenization type, extraction time, and temperature were evaluated in terms of improving the extraction conditions. The plant extracts were subjected to specific spectrophotometric analysis designed for each parameter, and the total phenols content was determined. After establishing the optimal conditions, the extracts...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phytochemistry; DPPH; ABTS; FRAP; Phenolic acids.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542020000100245