John K. Wanyoko
54 Papers
270 Citations
John K. Wanyoko is an academic researcher. The author has contributed to research in topics: Camellia sinensis & Chemistry. The author has an hindex of 15, co-authored 54 publications.
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Papers
Total polyphenols, catechin profiles and antioxidant activity of tea products from purple leaf coloured tea cultivars.
TL;DR: The results of this study suggest that the antioxidant potency of teas is dependent on the predominant flavonoid compound, the type of tea cultivar and the processing method.
157
Characterization of anthocyanins in Kenyan teas: Extraction and identification
TL;DR: In this article, the authors extracted monomeric anthocyanins from tea products from a number of newly bred purple leaf coloured Kenyan tea cultivars (Camellia sinensis) using acidified methanol/HCl (99:1 v/v).
155
Correlation of theaflavins content and valuations of Kenyan black teas.
TL;DR: Correlation between the theaflavins content and tasters' valuations of Kenyan black teas generally give positive but statistically non-significant correlation coefficients as discussed by the authors, however, in 105 correlations using 12 samples each, only eight analyses gave statistically significant (P⩽0.05) correlations.
63
Green tea from purple leaf coloured tea clones in Kenya- their quality characteristics.
TL;DR: It is concluded that all the studied clones/varieties have above the minimum 14% of total polyphenols, and K-purple and TRFK 91/1 showed high green tea quality indices with the latter doubling with high levels of theanine; hence its highly recommended for green tea manufacture.
36
Effect of Sunlight Exposure and Different Withering Durations on Theanine Levels in Tea ( Camellia sinensis )
TL;DR: Theanine is a non-protein amino acid representing as much as 50% of the total amino acids in black tea and 1% - 2% of dry weight in green tea as discussed by the authors.