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Thermal oxidation of rice bran oil during oven test and microwave heating

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Abstract

The purpose of the present study was to evaluate the oxidative stability of physically refined rice bran oil (RBO) under oven heating at 63 °C and microwave heating conditions by absorptivity. Oil samples with tertiary-butylhydroquinone (TBHQ) (100 ppm and 200 ppm), citric acid (CA), butylhydroxyanisole/butylhydroxytoluene (BHA/BHT) and in other combination, BHA/BHT+CA were submitted to oven test for 6 days, and the linear coefficient of correlation between peroxide value and absorptivity at 232 nm was determined. The gradual increase in peroxide value and absorptivity at 232 nm was observed in all the RBO samples, control and antioxidant added. RBO samples added with tertiary-butylhydroquinone (TBHQ) had shown the least peroxide value and absorptivity as 6.10 and 5.8 respectively, when added at a concentration of 200 ppm whereas; the control RBO samples had shown the maximum values. The peroxide values obtained from the correlations during the oven test were found closely correlated with the peroxide values obtained during the microwave oven heating experimentally. The effect of microwave heating on the oryzanol content and p-anisidine value was also observed and the correlation to the oven test was established. The oryzanol content and p-anisidine values obtained after oven heating when correlated to the microwave heating data showed the oryzanol content 13,371, 13,267 and 13,188 ppm after 1 day, 4 days and 5 days respectively which were closely correlated with the experimental value.

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Authors and Affiliations

  1. Food Engineering and Technology Department, Sant Longowal Institute of Engineering and Technology (Deemed-To-Be-University), Longowal, 148 106, Sangrur, India

    Richa Mishra, Harish K. Sharma, Bhavesh C. Sarkar & Charanjiv Singh

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  1. Richa Mishra
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  2. Harish K. Sharma
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  3. Bhavesh C. Sarkar
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  4. Charanjiv Singh
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Correspondence to Harish K. Sharma.

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Mishra, R., Sharma, H.K., Sarkar, B.C. et al. Thermal oxidation of rice bran oil during oven test and microwave heating. J Food Sci Technol 49, 221–227 (2012). https://doi.org/10.1007/s13197-011-0274-7

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  • DOI: https://doi.org/10.1007/s13197-011-0274-7

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