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Reduced-Pressure Fiber-in-Needle Sampling of Aldehydes for Room Temperature Assessment of Edible Oils' Oxidative Stability

机译:醛的减压纤维纤维取样进行室温评估食用油的氧化稳定性

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摘要

A thin film of polypyrrole/graphene oxide (PPy/GO) nanocomposite was coated on the surface of a stainless-steel fiber by electrochemical polymerization, fixed inside a needle, and used for reduced-pressure fiber-in-needle (RP-FIN) dynamic sampling of aldehydes in edible oils, followed by GC-FID determination. Heating the sample matrix is among the most used strategies to improve the extraction efficiency and reduce the extraction time. Nevertheless, heat increases the aldehyde content of the oil samples and cannot be used to improve release of the analytes from the matrix and achieve a proper extraction efficiency. Reduced-pressure condition is a promising alternative for enhancing the extraction efficiency in low-temperature condition, especially for oxygen-sensitive samples. Therefore, the sampling was performed under the reduced-pressure conditions. The influential experimental variables were evaluated. Under the optimal conditions, limits of detection were in the range of 0.1-0.8 mu g L-1 and linear dynamic ranges were found to be 0.7-50,000 mu g L-1. The relative standard deviations were obtained 5.9-9%. The RP-FIN-GC-FID method was successfully applied for the sampling and analysis of hexanal, heptanal, nonanal, decanal and undecanal in several edible oil real samples and the samples' oxidative resistances were compared.
机译:通过电化学聚合,固定在针内的不锈钢纤维表面上的薄膜薄膜,涂覆在不锈钢纤维表面上,并用于减压纤维 - 针(RP-FIN)可食用油中醛的动态取样,其次是GC-FID测定。加热样品矩阵是提高提取效率并减少提取时间的最常用策略之一。然而,热量增加了油样的醛含量,不能用于改善来自基质的分析物的释放并实现适当的提取效率。减压条件是提高低温条件下提取效率的有希望的替代方案,特别是对于氧敏感样品。因此,在减压条件下进行采样。评估有影响的实验变量。在最佳条件下,检测限范率在0.1-0.8μmGL-1和线性动态范围的范围内为0.7-50,000μgl-1。获得相对标准偏差5.9-9%。成功地应用RP-Fin-GC-FID方法对几种可食用油真实样品中己醛,庚醇,壬醛,癸醛和未食指的取样和分析,并进行了样品的氧化抗性。

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