Article

Journal of the American Oil Chemists' Society

, Volume 81, Issue 4, pp 407-413

Zero-trans shortening using palm stearin and rice bran oil

  • P. N. MayamolAffiliated withAgro Processing and Natural Products Division, Regional Research Laboratory, Council of Scientific and Industrial Research
  • , T. SamuelAffiliated withAgro Processing and Natural Products Division, Regional Research Laboratory, Council of Scientific and Industrial Research
  • , C. BalachandranAffiliated withAgro Processing and Natural Products Division, Regional Research Laboratory, Council of Scientific and Industrial Research
  • , A. SundaresanAffiliated withAgro Processing and Natural Products Division, Regional Research Laboratory, Council of Scientific and Industrial Research
  • , C. ArumughanAffiliated withAgro Processing and Natural Products Division, Regional Research Laboratory, Council of Scientific and Industrial Research Email author 

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Abstract

Several pilot-scale trials reported in this paper, using palm stearin-rice bran oil (PS-RBO) blends, obviously did not contain trans FA (TFA), whereas the commercial products were found to contain 18–27% TFA. The effects of processing conditions such as rate of agitation, crystallization temperature, and composition of the blends on the crystal structure of shortenings were studied. The products were evaluated for their physicochemical characteristics using DSC, X-ray diffraction (XRD), HPLC, and FTIR techniques. The formulation containing 50% PS and 50% RBO showed melting and cooling characteristics similar to those of hydrogenated commercial “vanaspati” samples. Analysis of the FA composition revealed that the formulated shortenings contained 15–19% C18∶2 PUFA. Tocopherol and tocotrienol contents of the experimental shortenings were in the range of 850–1000 ppm with oryzanol content up to 0.6%. XRD studies demonstrated that the crystal form in the shortenings was predominantly the most stable β′ form, and there was less of the undesirable β form.

Key Words

DSC margarine crystallizer palm stearin polyunsaturated fatty acids rice bran oil solid fat content trans-fatty acids zero-trans shortening