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In vitro assessment of pyrethroid bioaccessibility via particle ingestion
Environment International ( IF 11.8 ) Pub Date : 2018-06-26 , DOI: 10.1016/j.envint.2018.05.043
Jie Wang , Kunde Lin , Allison Taylor , Jay Gan

Due to their intensive use in agricultural and residential pest control, human exposure to residues of multiple pyrethroids frequently occurs. Pyrethroids have exceptionally high affinity for solid particles, highlighting the need to understand human exposure through oral ingestion of contaminated soil or dust particles. In this study, we used artificial gastrointestinal fluids to measure the desorption or bioaccessibility of eight current-use pyrethroids in soil and dust samples. Tenax was further included as a sink in parallel treatments to simulate the effect of removal due to transfer of pyrethroids to lipid membranes. The use of 0.4 g of Tenax in 20 mL digestive fluids resulted in rapid and efficient trapping of pyrethroids, and further, greatly increased bioaccessibility. In the artificial digestive fluids without Tenax, 6.0–48.0% of pyrethroids were desorbed over 21 h, and the fractions increased by 1.6–4.1 folds to 21.5–79.3% with the Tenax sink. Therefore, 6.0–79.3% of soil or dust-borne pyrethroids may be considered bioavailable upon ingestion. While protein and sucrose increased the estimated bioaccessibility, co-presence of lipid (vegetable oil) decreased the bioaccessibility of pyrethroids, likely due to competitive phase partition. Pyrethroids were also found to be unstable in the artificial intestinal fluid containing pancreatin, further decreasing the potential bioaccessibility of pyrethroids on soil or dust particles. The limited bioaccessibility should be considered to refine the prediction of human exposure and risk through oral ingestion of pyrethroid residues.



中文翻译:

通过颗粒摄入体外评估拟除虫菊酯的生物可及性

由于它们在农业和住宅病虫害防治中的大量使用,人体经常暴露于多种拟除虫菊酯的残留物中。拟除虫菊酯对固体颗粒具有极高的亲和力,这突出表明需要通过口服摄入被污染的土壤或粉尘颗粒来了解人体暴露。在这项研究中,我们使用人工胃肠液来测量土壤和粉尘样品中八种目前使用的拟除虫菊酯的解吸或生物可及性。Tenax还作为平行处理中的水槽包括在内,以模拟由于拟除虫菊酯转移至脂质膜而产生的去除效果。在20 mL消化液中使用0.4 g Tenax可以快速有效地捕获拟除虫菊酯,并进一步大大提高了生物利用度。在没有Tenax的人工消化液中,为6.0–48。0%的拟除虫菊酯在21 h内解吸,并且使用Tenax水槽时,其分数增加了1.6–4.1倍,达到21.5–79.3%。因此,摄食后认为有6.0-79.3%的土壤或粉尘类拟除虫菊酯具有生物利用度。尽管蛋白质和蔗糖增加了估计的生物利用度,但脂质(植物油)的共存降低了拟除虫菊酯的生物利用度,这可能是由于竞争性相分配所致。拟除虫菊酯在含有胰酶的人工肠液中也不稳定,进一步降低了拟除虫菊酯在土壤或粉尘颗粒上的潜在生物利用度。应考虑有限的生物可及性,以通过口服摄入拟除虫菊酯残留物来完善对人类接触和风险的预测。Tenax水槽的3%。因此,摄食后认为有6.0-79.3%的土壤或粉尘类拟除虫菊酯具有生物利用度。尽管蛋白质和蔗糖增加了估计的生物利用度,但脂质(植物油)的共存降低了拟除虫菊酯的生物利用度,这可能是由于竞争性相分配所致。拟除虫菊酯在含有胰酶的人工肠液中也不稳定,进一步降低了拟除虫菊酯在土壤或粉尘颗粒上的潜在生物利用度。应考虑有限的生物可及性,以通过口服摄入拟除虫菊酯残留物来完善对人类接触和风险的预测。Tenax水槽的3%。因此,摄食后认为有6.0-79.3%的土壤或粉尘类拟除虫菊酯具有生物利用度。尽管蛋白质和蔗糖增加了估计的生物利用度,但脂质(植物油)的共存降低了拟除虫菊酯的生物利用度,这可能是由于竞争性相分配所致。拟除虫菊酯在含有胰酶的人工肠液中也不稳定,进一步降低了拟除虫菊酯在土壤或粉尘颗粒上的潜在生物利用度。应考虑有限的生物可及性,以通过口服摄入拟除虫菊酯残留物来完善对人类接触和风险的预测。脂质(植物油)的共存会降低拟除虫菊酯的生物利用度,这可能是由于竞争性相分配所致。拟除虫菊酯在含有胰酶的人工肠液中也不稳定,进一步降低了拟除虫菊酯在土壤或粉尘颗粒上的潜在生物利用度。应考虑有限的生物可及性,以通过口服摄入拟除虫菊酯残留物来完善对人类接触和风险的预测。脂质(植物油)的共存会降低拟除虫菊酯的生物利用度,这可能是由于竞争性相分配所致。拟除虫菊酯在含有胰酶的人工肠液中也不稳定,进一步降低了拟除虫菊酯在土壤或粉尘颗粒上的潜在生物利用度。应考虑有限的生物可及性,以通过口服摄入拟除虫菊酯残留物来完善对人类接触和风险的预测。

更新日期:2018-07-12
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