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Black Tea Is a Powerful Chemopreventor of Reactive Oxygen and Nitrogen Species: Comparison with Its Individual Catechin Constituents and Green Tea

Black Tea Is a Powerful Chemopreventor of Reactive Oxygen and Nitrogen Species: Comparison with Its Individual Catechin Constituents and Green Tea

Author: Anasuya Sarkar and Amar Bhaduri

Production of black tea [BT] results in biotransformation of catechins of green tea [GT] to theaflavins and thearubigins. BT was found to be more efficient than GT and its individual catechin constituents in proportionate amounts in abrogating production of NO and O2 in activated murine peritoneal macrophages. In a reconstitution system of BT that is free of all catechins, stepwise addition of catechins showed that though all the constituents contributed to the overall effect of BT, theaflavin was the most powerful in abrogating NO production. RT-PCR analysis also showed theaflavin to be the most important constituent in down-regulating synthesis of iNOS. Clearly, BT containing theaflavin is an excellent chemopreventor against reactive oxygen and nitrogen species.

 

 

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