Characterization and Analysis of Polyphenols in Green and Black Tea Brands Available in Commercial Market of Pakistan
Abstract
In present study, the quality of commercially brands of green and black tea available in Pakistan
was analyzed on the basis of phenolic contents. Total phenolic content was analyzed through
spectrophotometric measurement using the Ferrous Tartrate method. Individual catechins along
with gallic acid and caffeine were determined using HPLC-UV. TPC of green tea was found to be
higher than black tea. Among green tea brands, Lipton Clear Green showed higher TPC than
Tapal Gulbahar. Both green and black tea polyphenols showed higher solubility in the aqueous
acetone (50%, v/v) compared to water. (-)-EGCG was detected as the most abundant catechins in
all green and black tea samples. Theaflavin content of Lipton Yellow Label and Vital was
significantly higher than Tapal Family Mixture and Tetley. Based on catechins and theaflavins
content, Lipton Clear Green, Lipton Yellow Label, and Vital Tea were considered to be of higher
quality than other brands.
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