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Registro Completo |
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Biblioteca(s): |
Embrapa Unidades Centrais. |
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Data corrente: |
11/03/1999 |
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Data da última atualização: |
02/08/2019 |
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Autoria: |
VITÓRIA, A. P.; MAZZAFERA, P. |
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Afiliação: |
ANGELA PIERRE VITÓRIA, Universidade Estadual de Campinas - UNICAMP/Departamento Fisiologia Vegetal. Bolsista do CNPq; PAULO MAZZAFERA, Universidade Estadual de Campinas - UNICAMP/Departamento Fisiologia Vegetal. Bolsista do CNPq. |
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Título: |
Caffeine degradation in leaves and fruits of coffea arabica and coffea dewevrei. |
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Ano de publicação: |
1998 |
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Fonte/Imprenta: |
Pesquisa Agropecuária Brasileira, Brasília, DF, v. 33, n. 12, p. 1957-1961, dez. 1998. |
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Idioma: |
Inglês |
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Notas: |
Título em inglês: Degradação de cafeína em folhas e frutos de coffea arábica e coffea dewevrei. |
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Conteúdo: |
The coffee species Coffea dewevrei and Coffea arabica have marked differences in caffeine metabolism and the control of the caffeine content during fruit ripening and leaf aging is still not clear. The aim of this work was a detailed investigation on the alkaloid degradation in young and aged leaves, and immature and mature fruits of these species. Young and aged leaves, and immature and mature fruits were fed with (2-14 C) caffeine. After an incubation period they were extracted for (2-14 C) caffeine and metabolites and analysed by reversed-phase liquid chromatography and radiocounting of collected fraction. In leaves and fruits of Coffea dewevrei there were higher degradation rates of caffeine. In both species, compared to young tissues, aged leaves and mature fruits presented lower capacity to degrade the alkaloid, what was shown by the low radioactivities detected in the metabolites formed in the degradation pathway. Radioactivity was detected in 7-methylxanthine, which is also a precursor in the caffeine biosynthesis. The data support the conclusion that the ratio betwenn biosynthesis and biodegradation controls the variation of the caffeine content during fruit ripening and leaf aging in C. arabica and C. dewevrei. |
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Palavras-Chave: |
Caffeine metabolism; Coffee; Metabolismo da cafeina; Methylxanthines; Metilxantinas. |
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Thesagro: |
Café. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/AI-SEDE/3676/1/pab414_96.pdf
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Marc: |
LEADER 01964naa a2200217 a 4500
001 1086984
005 2019-08-02
008 1998 bl uuuu u00u1 u #d
100 1 $aVITÓRIA, A. P.
245 $aCaffeine degradation in leaves and fruits of coffea arabica and coffea dewevrei.
260 $c1998
500 $aTítulo em inglês: Degradação de cafeína em folhas e frutos de coffea arábica e coffea dewevrei.
520 $aThe coffee species Coffea dewevrei and Coffea arabica have marked differences in caffeine metabolism and the control of the caffeine content during fruit ripening and leaf aging is still not clear. The aim of this work was a detailed investigation on the alkaloid degradation in young and aged leaves, and immature and mature fruits of these species. Young and aged leaves, and immature and mature fruits were fed with (2-14 C) caffeine. After an incubation period they were extracted for (2-14 C) caffeine and metabolites and analysed by reversed-phase liquid chromatography and radiocounting of collected fraction. In leaves and fruits of Coffea dewevrei there were higher degradation rates of caffeine. In both species, compared to young tissues, aged leaves and mature fruits presented lower capacity to degrade the alkaloid, what was shown by the low radioactivities detected in the metabolites formed in the degradation pathway. Radioactivity was detected in 7-methylxanthine, which is also a precursor in the caffeine biosynthesis. The data support the conclusion that the ratio betwenn biosynthesis and biodegradation controls the variation of the caffeine content during fruit ripening and leaf aging in C. arabica and C. dewevrei.
650 $aCafé
653 $aCaffeine metabolism
653 $aCoffee
653 $aMetabolismo da cafeina
653 $aMethylxanthines
653 $aMetilxantinas
700 1 $aMAZZAFERA, P.
773 $tPesquisa Agropecuária Brasileira, Brasília, DF$gv. 33, n. 12, p. 1957-1961, dez. 1998.
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Registro original: |
Embrapa Unidades Centrais (AI-SEDE) |
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Tipo/Formato |
Classificação |
Cutter |
Registro |
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Voltar
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Registro Completo
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Biblioteca(s): |
Embrapa Semiárido; Embrapa Uva e Vinho. |
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Data corrente: |
19/04/2013 |
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Data da última atualização: |
24/04/2017 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
B - 2 |
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Autoria: |
CAZARIN, C. B. B.; CORREA, L. C.; SILVA, J. K. da; BATISTA, A. G.; FURLAN, C. P. B.; BIASOTO, A. C. T.; PEREIRA, G. E.; RYBKA, A. C. P.; MARÓSTICA JUNIOR, M. R. |
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Afiliação: |
LUIZ CLAUDIO CORREA, CPATSA; ALINE TELLES BIASOTO MARQUES, CPATSA; GIULIANO ELIAS PEREIRA, CNPUV / CPATSA; ANA CECILIA POLONI RYBKA, CPATSA. |
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Título: |
Tropical Isabella grape juices: bioactive compounds and antioxidant power depends on harvest season. |
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Ano de publicação: |
2013 |
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Fonte/Imprenta: |
Journal of Food Science and Engineering, El Monte v. 3, n. 2, p. 64-70, fev. 2013. |
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Idioma: |
Inglês |
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Conteúdo: |
Grapes are important sources of antioxidants compounds and one of the most used varieties to elaborate juices is 'Isabel', or 'Isabella', as it is called in North-America. This study aimed to evaluate the antioxidant activity of Isabella grape juices from the tropical semi-arid climate produced in Brazil on March and September, 2010. Total phenolics and anthocyanins were determined, as well as the antioxidant capacity by DPPH, FRAP and hydrophilic ORAC methods. Test T was used to compare statistical difference at 5% of significance level. As expected, the results showed that the season can play a significant role on phenolics content and antioxidant power. Polyphenols content in juices varied from 82.9 ± 0.92 to 102.2 ± 1.59 mg GAE 100 mL-1 and anthocyanins content ranged from 44.3 ± 2.01 to 129.5 ± 2.82 mg cyanidin-3-glucoside 100 mL-1. Regression analyses showed a high correlation of antioxidant capacity and anthocyanins content. Grapes from Sao Francisco River Valley demonstrated to be a good source of antioxidant for human diet. |
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Palavras-Chave: |
Atividade antioxidante; Grape; Isabel. |
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Thesagro: |
Análise química; Antocianina; Composto Fenólico; Nutrição; Suco; Uva; Viticultura; Vitis Vinifera. |
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Categoria do assunto: |
--
F Plantas e Produtos de Origem Vegetal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/82421/1/Aline-2013.pdf
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/81757/1/CASARIN-JFoodSciEng-v3n2p64-2013.pdf
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Marc: |
LEADER 02058naa a2200349 a 4500
001 1957191
005 2017-04-24
008 2013 bl uuuu u00u1 u #d
100 1 $aCAZARIN, C. B. B.
245 $aTropical Isabella grape juices$bbioactive compounds and antioxidant power depends on harvest season.$h[electronic resource]
260 $c2013
520 $aGrapes are important sources of antioxidants compounds and one of the most used varieties to elaborate juices is 'Isabel', or 'Isabella', as it is called in North-America. This study aimed to evaluate the antioxidant activity of Isabella grape juices from the tropical semi-arid climate produced in Brazil on March and September, 2010. Total phenolics and anthocyanins were determined, as well as the antioxidant capacity by DPPH, FRAP and hydrophilic ORAC methods. Test T was used to compare statistical difference at 5% of significance level. As expected, the results showed that the season can play a significant role on phenolics content and antioxidant power. Polyphenols content in juices varied from 82.9 ± 0.92 to 102.2 ± 1.59 mg GAE 100 mL-1 and anthocyanins content ranged from 44.3 ± 2.01 to 129.5 ± 2.82 mg cyanidin-3-glucoside 100 mL-1. Regression analyses showed a high correlation of antioxidant capacity and anthocyanins content. Grapes from Sao Francisco River Valley demonstrated to be a good source of antioxidant for human diet.
650 $aAnálise química
650 $aAntocianina
650 $aComposto Fenólico
650 $aNutrição
650 $aSuco
650 $aUva
650 $aViticultura
650 $aVitis Vinifera
653 $aAtividade antioxidante
653 $aGrape
653 $aIsabel
700 1 $aCORREA, L. C.
700 1 $aSILVA, J. K. da
700 1 $aBATISTA, A. G.
700 1 $aFURLAN, C. P. B.
700 1 $aBIASOTO, A. C. T.
700 1 $aPEREIRA, G. E.
700 1 $aRYBKA, A. C. P.
700 1 $aMARÓSTICA JUNIOR, M. R.
773 $tJournal of Food Science and Engineering, El Monte$gv. 3, n. 2, p. 64-70, fev. 2013.
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Embrapa Semiárido (CPATSA) |
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