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How manufacturing processes affect the level of pesticide residues in tea†

IR@CSIR-IHBT

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Title How manufacturing processes affect the level
of pesticide residues in tea†
 
Creator Sood, Chitra
Jaggi, Shivani
Kumar, Vipin
S D , Ravindranath
Shanker, Adarsh
 
Subject Pest and Pesticides
 
Description Tea (both green and black) is consumed throughout the world, both for pleasure and therapeutic
purposes. Most people will be unaware of their involuntary exposure to residues of pesticides lingering
in processed tea and so possibly transferring into infusions of tea. The purpose of this work was to
study the effect of green tea and orthodox black tea manufacturing processes on the fate of pesticides
sprayed onto tea bushes (Camellia sinensis). The fates of residues of dimethoate, quinalphos, dicofol
and deltamethrin in these two different types of tea manufacturing processes were compared. For black
tea, the manufacturing process involves leaf harvesting, withering, rolling, fermentation and drying; and
for green tea, leaf harvesting, microwave heating, rolling and drying. The two processes resulted in the
same concentration factor of plant material into the dried commodity, while the decreases in residue
levels were different for different pesticides. Initial microwave heating and dehydration in the green tea
manufacturing process resulted in greater loss of pesticide residues than did withering and dehydration
in black tea; no significant reduction in residue level resulted from the rolling and fermentation steps in
black tea. Residue levels in both green and black teas were reduced during final drying.
2004 Society of Chemical Industry
 
Date 2004
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://ihbt.csircentral.net/410/1/157_2004_How.pdf
Sood, Chitra and Jaggi, Shivani and Kumar, Vipin and S D , Ravindranath and Shanker, Adarsh (2004) How manufacturing processes affect the level of pesticide residues in tea†. Journal of Science ofFood and Agriculture, 84 (15). pp. 2123-2127.
 
Relation http://ihbt.csircentral.net/410/