Comparison of Four Different Polymeric Adsorbents as Clean-up Agents for Pesticide Analysis in Tea with LC MS/MS

Nihat Özcan
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Abstract

Previously published studies indicate that tea (Camellia sinensis) contains essential oils, flavonoids, phenolics, lipids, natural pigments, sugars, and oligosaccharides. These essential biomolecules in Camellia sinensis cause serious problems in the determination of pesticide residues. High amount of co extractives can exhibit chromatographic characteristics similar to some pesticides, which may cause serious matrix effects and significant interference in mass spectrometry analysis. In this study, we compared four polymeric resins as clean-up sorbents for the determination of 216 pesticide residues in tea by a high performance liquid chromatography triple quadrupole mass spectrometry. styrene-divynilbenzene  (Diaion HP20), Polyamide 6, Polyvinylpolypyrrolidone (PPVP), and Amberlite XAD 7 were used as clean-up sorbents instead of PSA. However,to evaluate the effectiveness of the adsorbents, recovery studies were carried out using these adsorbents. In addition, GC-MS analysis was also performed to see the ability of these adsorbents to remove co-extracts. According to the recovery results, when the acceptable limit was accepted as 60-140%, it was determined that the resin that gave the best results with 170 pesticides was polyamide. Diaion was the second resin with 166 pesticides, while XAD, PSA which was used as control group and PPVP were determined as the third, fourth, and fifth resins with very close values of 159, 155, and 152 pesticides, respectively. According to GC-MS total ion analysis, it was observed that PSA gave the chromatogram with the least co- extract, while it was observed that PSA was the worst adsorbent in removing caffeine, one of the main bioactive compounds in tea. XAD-7 and Polyamide were found to be the best adsorbents in removing caffeine.
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四种不同聚合物吸附剂在茶叶农药分析中的净化效果比较
先前发表的研究表明,茶(Camellia sinensis)含有精油、类黄酮、酚类物质、脂质、天然色素、糖和低聚糖。山茶中这些重要的生物分子在农药残留的测定中引起了严重的问题。大量的共萃取物会表现出与某些农药类似的色谱特征,可能会造成严重的基质效应,对质谱分析产生明显的干扰。采用高效液相色谱-三重四极杆质谱法测定茶叶中216种农药残留,比较了4种聚合物树脂作为清洁吸附剂的效果。用苯乙烯-二乙烯苯(Diaion HP20)、聚酰胺6、聚乙烯聚吡罗烷酮(PPVP)和Amberlite XAD 7代替PSA作为清理吸附剂。然而,为了评估吸附剂的有效性,使用这些吸附剂进行了回收研究。此外,还进行了GC-MS分析,以了解这些吸附剂去除共提取物的能力。根据回收率结果,在可接受限度为60 ~ 140%时,确定了对170种农药效果最好的树脂为聚酰胺树脂。第二种树脂为Diaion,含166种农药;第三、第四、第五种树脂为XAD,以PSA为对照,PPVP为PPVP,分别含159、155、152种农药。GC-MS总离子分析发现,PSA对茶中主要生物活性物质之一的咖啡因的吸附效果最差,同时PSA对茶中主要生物活性物质之一的咖啡因的吸附效果最差。XAD-7和聚酰胺是去除咖啡因的最佳吸附剂。
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