Quality assessment and safety measurement of different industrial processing stages of soybean oil

Authors : Nasrullah Syed, Sarfaraz Mahesar, Syed Tufail H. Sherazi, Mustafa Soylak

Pages : 28-33

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Publication Date : 2019-12-30

Article Type : Research

Abstract :The impact of industrial processing on physical and chemical properties as well as fatty acid    composition of soybean oil (SBO) was analyzed.  These physicochemical parameters were tested by standard (IUPAC and AOCS) methods. The observed results of physical properties showed that, at some stages in neutralization, bleaching and deodorization of crude SBO, the value of the  freezing point, color, moisture content and smoke point greatly decreased whereas a slight reduction in refractive index was obtained. Likewise, in the instance of chemical parameters,   saponification value, free fatty acids, peroxide value and iodine value were decreased from 177.0 to 176.1 mg KOH/g oil, 1.26 to 0.05%, 3.5 to 1.8 mEq O 2 /kg oil and 125.0 to 124.1 g I 2 /100g of oil, correspondingly. Refining processing did not obtain major impact on the fatty acid composition. During chemical neutralization step, soap contents were generated. Consequently, soap content was reduced from 61.0 to 15.2 ppm in bleaching and deodorization stages. Additionally, this study indicates that overall deodorization step has significant influence on physicochemical parameters to enhance the quality, stability and safety measurement of soybean oil. 
Keywords : Soybean oil, Physiochemical properties