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Int. J. Environ. Res. Public Health 2017, 14(10), 1157; doi:10.3390/ijerph14101157

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

1
School of Plant Protection, Anhui Agricultural University, Hefei 230036, China
2
Provincial Key Laboratory for Agri-Food Safety, Anhui Agricultural University, Hefei 230036, China
3
School of Resource & Environment, Anhui Agricultural University, Hefei 230036, China
*
Author to whom correspondence should be addressed.
Received: 1 September 2017 / Revised: 23 September 2017 / Accepted: 25 September 2017 / Published: 30 September 2017
(This article belongs to the Special Issue Dietary Exposures)
View Full-Text   |   Download PDF [1965 KB, uploaded 30 September 2017]   |  

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 Kow) 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. View Full-Text
Keywords: infusion; transfer; herbal tea; pyrethroids; risk assessment infusion; transfer; herbal tea; pyrethroids; risk assessment
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Xiao, J.-J.; Li, Y.; Fang, Q.-K.; Shi, Y.-H.; Liao, M.; Wu, X.-W.; Hua, R.-M.; Cao, H.-Q. Factors Affecting Transfer of Pyrethroid Residues from Herbal Teas to Infusion and Influence of Physicochemical Properties of Pesticides. Int. J. Environ. Res. Public Health 2017, 14, 1157.

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