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| 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 -> 7-methylxanthosine -> 7-methylxanthine -> theobromine -> 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 |
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| 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 |
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| DEUS,Valterney Lima; CERQUEIRA E SILVA,Mariana Barros de; MACIEL,Leonardo Fonseca; MIRANDA,Lucas Caldeirão Rodrigues; HIROOKA,Elisa Yoko; SOARES,Sérgio Eduardo; FERREIRA,Ederlan de Souza; BISPO,Eliete da Silva. |
| Abstract This work aimed to evaluate the performance of different drying methods in the development of phenolic compounds, methylxanthines, and antioxidant activity in cocoa bean and to evaluate the presence of ochratoxin A (OTA). Antioxidant activity was determined using DPPH, FRAP, ORAC and β-carotene-linoleic acid assays. Phenolic compounds and methylxanthines were determined using high-performance liquid chromatography with an ultraviolet detector (HPLC-UV). OTA was determined by ultra-performance liquid chromatography with fluorescence detection (UPLC-FLR). It was found that during cocoa drying, there was a reduction in antioxidant activity with reduced phenolic compound content (0.04 mg.g-1 of catechin before drying to 0.02 mg.g-1 after drying) and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Catechin; Epicatechin; Caffeine; Theobromine; Mycotoxin. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612018000500278 |
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| 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 |
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