Theanine and Caffeine content of infusions prepared from commercial tea samples
نویسندگان
چکیده
منابع مشابه
Acute effects of theanine, caffeine and theanine-caffeine combination on attention.
OBJECTIVE l-theanine is a constituent of tea which is claimed to enhance cognitive functions. We aimed to determine whether theanine and theanine-caffeine combination have acute positive effects on cognitive and neurophysiological measures of attention, compared to caffeine (a positive control) and a placebo in healthy individuals. DESIGN In a placebo-controlled, five-way crossover trial in 2...
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To date quality and selling price of a tea mainly depends on its flavour, taste and texture but not on its medicinal properties though a Chinese scientist in 780 AD suggested and acclaimed tea as a divine remedy and supreme gift of God for preserving mental tranquillity. Different studies have been showed that L-theanine is the key component of tea which can make us mentally calm, cool and rela...
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The present communication describes a simple and modified colorimetric procedure for the estimation of caffeine content in both commercial and locally available tea samples. Comparative data of caffeine content in different brands of tea samples are shown here. The present method is no doubt an improvised procedure for estimating directly caffeine content from the tea extracts. A possible expla...
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The effects of product and preparation variables on the in-cup chemical composition of tea extracts is of interest because the appearance and taste characteristics and the possible health effects of a tea liquor arise from the chemical components extracted from the leaf during tea preparation. A comprehensive study was therefore undertaken to determine the contributions of product and preparati...
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ژورنال
عنوان ژورنال: Pharmacognosy Magazine
سال: 2016
ISSN: 0973-1296
DOI: 10.4103/0973-1296.176061