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A Thought on the Biological Activities of Black Tea

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Title A Thought on the Biological Activities
of Black Tea
 
Creator Vasundhara, Sharma
Jagan Mohan Rao, L.
 
Subject 08 Tea
32 Antioxidants
 
Description Tea is the most widely used ancient beverage in the world and black tea possesses many biological effects on the organisms.
It acts as an effective antioxidant because of its free radical-scavenging and metal-chelating ability. Due to this, it is active
against inflammation, clastogenesis, and several types of cancer. Tea reduces DNA damage and mutagenesis due to oxidative
stress or the presence of pro-mutagens through antioxidant function, blocking activation pathways of mutagens, suppressing
transcription of enzymes involved etc. Inhibition of low-density lipoprotein (LDL) peroxidation, suppression of fatty acid
synthase etc., suggest that tea may have a role in preventing cardiovascular diseases. Some epidemiological studies support
the protective role of black tea against cardiovascular diseases but some do not. Besides, black tea has beneficial effects on
the gastrointestinal tract; it affects motility, absorption, microflora etc., by influencing the hormonal balance and antioxidant
function black tea improves bone mineral density. It is also antiviral due to its enzyme-inhibiting and receptor-blocking
properties. Although its role in cancers of the gastrointestinal tract, liver, and prostate is confirmed, its effect against urinary
tract cancer is uncertain and further studies are required.
Apart from these, excess consumption may lead to the formation of a stained pellicle layer on teeth, which is difficult to
eliminate, inhibits trypsin, influences mineral absorption, causes convulsions etc. Excess caffeine intake may have adverse
effects on selected organs as reported in studies on some organisms. These reports indicate that there is a wide scope of
further research for the efficient use of black tea active conserves/isolates to reap health benefits.
 
Date 2009
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://ir.cftri.com/3081/1/Critical_Reviews_in_Food_Science_and_Nutrition%2C_1549-7852%2C_Volume_49%2C_Issue_5%2C_2009%2C_Pages_379_%E2%80%93_404.pdf
Vasundhara, Sharma and Jagan Mohan Rao, L. (2009) A Thought on the Biological Activities of Black Tea. Critical Reviews in Food Science and Nutrition, 49. pp. 379-404.