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首页> 外文期刊>Journal of the Mass Spectrometry Society of Japan >Determination of Total Hydroperoxides in Oxidized Vegetable Oils Based on Triphenylphosphine Oxidation Using Electron Ionization Mass Spectrometry
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Determination of Total Hydroperoxides in Oxidized Vegetable Oils Based on Triphenylphosphine Oxidation Using Electron Ionization Mass Spectrometry

机译：三苯膦氧化-电子电离质谱法测定氧化植物油中的总氢过氧化物

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摘要

A method for determining the peroxide value (POV) of oxidized vegetable oil using electron ionization mass spectrometry (EI-MS) was developed. The range of POV measured by the method developed in this study is 0-100 meq/kg, which is a matter of interest for those involved in the vegetable oil industry. This method consists of three steps: the hydroperoxides in the sample oxidize triphenylphosphine (TPP), which produces triphenylphosphine oxide (TPPO); the TPPO concentration in the reaction solution is determined by EI-MS; and the POV of the sample is obtained from the calibration curve, which correlates the POV from the iodometric method with the TPPO concentration. The oxidation reaction of TPP was obtained by mixing TPP, oxidized vegetable oil, 3,5-di-t-butyl-4-hydroxy toluene (antioxidant), and the mixed solvent of chloroform and methanol in a test tube. The test tube was tightly sealed and then stored in the dark at 60℃ for 60 min. The resultant solution was poured into a test tube for the EI and ionized using an ionization energy of 20 eV. The ion strength of the TPPO dehydride molecule, by which the TPPO concentration was obtained, was determined using the maximum value of the selected ion current chromatogram peak. The calibration curve was prepared from the POV obtained from the iodometric method and the TPPO concentration obtained by this method, using a moderately oxidized vegetable oil. For samples of air-oxidized cotton seed oil, olive oil, soybean oil, and safflower oil, the POV obtained from the TPPO concentration using the calibration curve showed good agreement with that obtained by the iodometric method.
机译：开发了一种使用电子电离质谱（EI-MS）测定氧化植物油的过氧化物值（POV）的方法。通过本研究开发的方法测得的POV范围为0-100 meq / kg，这是涉及植物油行业的人们关注的一个问题。该方法包括三个步骤：样品中的氢过氧化物氧化三苯膦（TPP），生成三苯膦氧化物（TPPO）；用EI-MS测定反应溶液中的TPPO浓度。从标定曲线获得样品的POV，该标定曲线将来自碘量法的POV与TPPO浓度相关联。通过在试管中混合TPP，氧化的植物油，3,5-二叔丁基-4-羟基甲苯（抗氧化剂）以及氯仿和甲醇的混合溶剂，可以得到TPP的氧化反应。将试管紧密密封，然后在60℃的黑暗环境中存放60分钟。将所得溶液倒入用于EI的试管中，并使用20 eV的电离能将其电离。使用所选离子流色谱图峰的最大值，确定获得TPPO浓度的TPPO脱水物分子的离子强度。使用中度氧化的植物油，由碘量法获得的POV和由该方法获得的TPPO浓度绘制校正曲线。对于空气氧化的棉籽油，橄榄油，大豆油和红花油的样品，使用校准曲线从TPPO浓度获得的POV与碘量法获得的POV显示出良好的一致性。

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