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Seasonal variations in theaflavin, thearubigin and caffeine contents of argentinian black teas
Author(s) -
Malec Laura S
Publication year - 1988
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740450210
Subject(s) - theaflavin , caffeine , black tea , chemistry , zoology , linear correlation , linear relationship , winter season , positive correlation , seasonality , food science , biology , biochemistry , ecology , mathematics , polyphenol , endocrinology , medicine , statistics , climatology , geology , antioxidant
Thirty‐three Argentinian black tea samples of three grades (BOP, BOPF and PF) obtained fortnightly were examined for their theaflavin (TF), thearubigin (TR) and total and extractable caffeine contents during the 1985/86 season. Total and extractable caffeine contents decreased gradually during most of the season after an early rapid increase. TF contents fluctuated following climatic variations, decreasing after rainy periods. Total colour and TF curves were consistent with there being a good linear correlation between them, whereas TR showed erratic fluctuations throughout the whole season.