Factors Affecting Transfer of Pyrethroid Residues from Herbal Teas to Infusion and Influence of Physicochemical Properties of Pesticides

Jin-Jing Xiao, Yang Li, Qing-Kui Fang, Yan-Hong Shi, Min Liao, Xiang-Wei Wu, Ri-Mao Hua and Hai-Qun Cao
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Jin-Jing Xiao: School of Plant Protection, Anhui Agricultural University, Hefei 230036, China
Yang Li: Provincial Key Laboratory for Agri-Food Safety, Anhui Agricultural University, Hefei 230036, China
Qing-Kui Fang: School of Plant Protection, Anhui Agricultural University, Hefei 230036, China
Yan-Hong Shi: Provincial Key Laboratory for Agri-Food Safety, Anhui Agricultural University, Hefei 230036, China
Min Liao: School of Plant Protection, Anhui Agricultural University, Hefei 230036, China
Xiang-Wei Wu: Provincial Key Laboratory for Agri-Food Safety, Anhui Agricultural University, Hefei 230036, China
Ri-Mao Hua: Provincial Key Laboratory for Agri-Food Safety, Anhui Agricultural University, Hefei 230036, China
Hai-Qun Cao: School of Plant Protection, Anhui Agricultural University, Hefei 230036, China

IJERPH, 2017, vol. 14, issue 10, 1-12

Abstract: The transfer of pesticide residues from herbal teas to their infusion is a subject of particular interest. In this study, a multi-residue analytical method for the determination of pyrethroids (fenpropathrin, beta-cypermethrin, lambda-cyhalothrin, and fenvalerate) in honeysuckle, chrysanthemum, wolfberry, and licorice and their infusion samples was validated. The transfer of pyrethroid residues from tea to infusion was investigated at different water temperatures, tea/water ratios, and infusion intervals/times. The results show that low amounts (0–6.70%) of pyrethroids were transferred under the different tea brewing conditions examined, indicating that the infusion process reduced the pyrethroid content in the extracted liquid by over 90%. Similar results were obtained for the different tea varieties, and pesticides with high water solubility and low octanol–water partition coefficients (log K ow ) exhibited high transfer rates. Moreover, the estimated values of the exposure risk to the pyrethroids were in the range of 0.0022–0.33, indicating that the daily intake of the four pyrethroid residues from herbal tea can be regarded as safe. The present results can support the identification of suitable tea brewing conditions for significantly reducing the pesticide residue levels in the infusion.

Keywords: infusion; transfer; herbal tea; pyrethroids; risk assessment (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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