Dissipation of carbofuran and carbaryl on Oolong tea during tea bushes, manufacturing and roasting processes.
Carbofuran (2,3-dihydro-2,2-dimethyl-7-benzofuranol-N-methylcarbamate) and carbaryl (1-naphthyl-N-methylcarbamate) are insecticides widely used in tea plantations. The objective of the present study was to evaluate the dissipation of carbofuran and carbaryl during the growth periods of Oolong tea, processing and roasting. Analysis of the residual insecticides was carried out using high-pressure liquid chromatography with a post-column fluorescence detector. Results showed that in the tea field carbofuran dissipated faster then carbaryl. Manufacturing processes of Oolong tea further reduced the carbofuran and carbaryl contents. The persistence of carbofuran and carbaryl was decreased with increasing roasting temperature. From the results, we conclude that the presence of carbofuran and carbaryl in tea can be reduced by proper field management, manufacturing and roasting processes.
Wu
Chia-Chang
CC
Tea Research Extension Station, Nantou, Taiwan.
Chu
Chun
C
Wang
Yei-Shung
YS
Lur
Huu-Sheng
HS
D012721:Carbaryl / Q000032:analysis* / Q000737:chemistry; D002235:Carbofuran / Q000032:analysis* / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D003257:Consumer Product Safety; D005506:Food Contamination / Q000032:analysis*; D005511:Food Handling / Q000379:methods*; D006801:Humans; D007306:Insecticides / Q000737:chemistry*; D010573:Pesticide Residues / Q000032:analysis; D013050:Spectrometry, Fluorescence; D013662:Tea / Q000737:chemistry* / Q000254:growth & development; D013696:Temperature
D007306:Insecticides; D010573:Pesticide Residues; D013662:Tea; D012721:Carbaryl; D002235:Carbofuran