An improved method for determining the phosphorus content in vegetable oils

Authors

  • Bin Chen,

    1. Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy, School of Chemical Engineering, Northwest University, Xi'an, P. R. China
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  • Xia Xiao,

    1. Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy, School of Chemical Engineering, Northwest University, Xi'an, P. R. China
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  • Rong Li,

    Corresponding author
    1. Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy, School of Chemical Engineering, Northwest University, Xi'an, P. R. China
    • Correspondence: Prof. Rong Li, Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy, School of Chemical Engineering, Northwest University, Xi'an 710069, P. R. China

      E-mail: lhr40222@tom.com

      Fax: +86 29 88302223

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  • Wanli Zhao,

    1. Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy, School of Chemical Engineering, Northwest University, Xi'an, P. R. China
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  • Kaidi Yang,

    1. School of Natural and Applied Sciences, Northwestern Polytechnical University, Xi'an, P. R. China
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  • Guoliang Chen,

    1. Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy, School of Chemical Engineering, Northwest University, Xi'an, P. R. China
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  • Xiaoxun Ma

    1. Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy, School of Chemical Engineering, Northwest University, Xi'an, P. R. China
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Abstract

During pretreatment process for oil sample, charring and ashing processes of oil in AOCS Official Method Ca 12-55 were improved. Oil was pretreated with concentrated sulfuric acid and potassium hydroxide instead of zinc oxide. As a result, soluble phosphate was obtained in a short time, the subsequent steps were also simplified. Firstly, phosphorus contents were measured, then the equivalent phosphatide contents in oil samples were calculated, RSD (relative SD) was only 1.03%. According to the spiking experiments at low, middle and high concentration levels, recoveries were between 97.03 and 100.99%, RSD were all less than 1.57% (n = 5). The method was applied for determining the equivalent phosphatide content of different types of oils. Compared with AOCS Official Method Ca 12-55, the improved method can provide a more effective means for detecting and analyzing the phosphorus or the equivalent phosphatide content in vegetable oils.

Practical applications: In theory, the applicable scope of the improved method should be consistent with that of AOCS Official Method Ca 12-55, that is, the method is also suitable for detecting phosphorus or the equivalent phosphatide content in crude, degummed and refined vegetable oils. However, the promotion of the method should be based on more experimental data from various vegetable oils.

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