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Fate of imidacloprid and acetamiprid residues during black tea manufacture and transfer into tea infusion

IR@CSIR-IHBT

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Title Fate of imidacloprid and acetamiprid residues during black tea manufacture and transfer
into tea infusion
 
Creator Gupta, Mamta
Shanker, Adarsh
 
Subject Pest and Pesticides
 
Description The objective of this paper is to investigate the loss/stability of neonicotinoids (imidacloprid and acetamiprid)
residues during the manufacture of black tea and to study the transfer of these pesticides from made tea to its
infusion. For orthodox black tea, the manufacturing process involves leaf harvesting (plucking two leaves and
a bud), withering, rolling, fermentation (oxidation), and drying. Initial withering and final drying resulted in the
loss of pesticide residues, but no significant reduction in residue levels resulted from the rolling and fermentation
steps. The drying process resulted in a residue transfer of 64–70% and 69–74% of the initial level, whereas the
brewing process resulted in a residue transfer of 37–39% and 45–49% of imidacloprid and acetamiprid,
respectively, from dried tea into the infusion. The decrease in acetamiprid levels during drying was also significant
(8–13%), whereas the total loss during the manufacturing process ranged from 26 to 31%. Further, brewing for
longer periods (an extended brewing time) resulted in higher transfer (up to 44% for imidacloprid and 53% for
acetamiprid) of pesticides to tea infusion. Further, the extent of pesticide leaching depends on its water solubility,
partition coefficient, and the brewing time.
 
Date 2009
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://ihbt.csircentral.net/288/1/263_2009_Fate_of_imidacloprid.pdf
Gupta, Mamta and Shanker, Adarsh (2009) Fate of imidacloprid and acetamiprid residues during black tea manufacture and transfer into tea infusion. Food Additives and Contaminants, 26 (2). pp. 157-163.
 
Relation http://ihbt.csircentral.net/288/