Oxidative stability of oils extracted from intact and dehulled sesame seeds was determined by monitoring changes in fatty acid composition, iodine value (IV), peroxide value (PV), conjugated diene (CD), para-anisidine value (p-AV), and 2-thiobarbituric acid (TBA) value and by nuclear magnetic resonance spectroscopy after storage under Schaal oven conditions at 65°C for up to 35 d. The oils from coated seeds were more stable, as reflected in PV, CD, p-AV and TBA values, than those extracted from dehulled seeds after roasting at 200°C, steaming at 100°C, roasting at 200°C plus steaming, or microwaving at 2450 MHz, except for TBA values of oil from microwaved seeds. After 35 d of storage at 65°C, the CD, p-AV, and TBA values of extracted oil from dehulled microwaved seeds were 17.72, 10.20, and 1.22, respectively, while those of their coated counterparts were significantly (P<0.05) different at 14.20, 16.47, and 1.26, respectively. Few significant changes were evident in the fatty acid composition of oil obtained from either coated and dehulled seeds subjected to different treatments. Nuclear magnetic resonance analyses found that Rao (aliphatic to olefinic protons) and Rad (aliphatic to diallylmethylene protons) ratios increased steadily over the entire storage period, which indicated progressive oxidation of unsaturated fatty acids.
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Salunkhe, D.K., J.K. Chavan, R.N. Adsule, and S.S. Kadam, Sesame, in World Oilseeds: Chemistry, Technology and Utilization, Van Nostrand Reinhold, New York, 1991, pp. 371–402.
Sawaya, W.N., M. Ayaz, J.K. Khalil, and A.F. Al-Shalhat, Chemical Composition and Nutritional Quality of Tehineh (Sesame Butter), Food Chem. 18:35–45 (1985).
Inyang, U.E., and C.U. Nwadimkpa, Functional Properties of Dehulled Sesame (Sesamum indicum L.) Seed Flour, J. Am. Oil Chem. Soc. 69:819–822 (1992).
Fukuda, Y., and M. Namiki, Recent Studies on Sesame Seed Oil, J. Jpn. Soc. Food Sci. Technol. 35:552–562 (1988).
Yen, G.-C., and S.-L. Shyu, Oxidative Stability of Sesame Oil Prepared from Sesame Seed with Different Roasting Temperatures, Food Chem. 31:215–224 (1989).
Yen, G.C., Influence of Seed Roasting Process on the Changes in Composition and Quality of Sesame (Sesame indicum) Oil, J. Sci. Food Agric. 50:563–570 (1990).
Wanasundara, U.N., F. Shahidi, and C.R. Jablonski, Comparison of Standard and NMR Methodologies for Assessment of Oxidative Stability of Canola and Soybean Oils, Food Chem. 52:249–253 (1995).
American Oil Chemists’ Society, Official Methods and Recommended Practices of the American Oil Chemists’ Society, 4th edn., edited by D. Firestone, American Oil Chemists’ Society, Champaign, 1990.
IUPAC, Standard Methods for the Analysis of Oils, Fats and Derivatives, 7th edn., edited by C. Paquot and A. Hautfenne, International Union of Pure and Applied Chemistry, Blackwell Scientific Publications, United Kingdom, 1987, pp. 210–211.
Wanasundara, U.N., and F. Shahidi, Application of NMR Spectroscopy to Assess Oxidative Stability of Canola and Soybean Oils, J. Food Lipids 1:15–24 (1993).
Yoshida, H., and G. Kajimoto, Microwave Heating Affects Composition and Oxidative Stability of Sesame (Sesamum indicum) Oil, J. Food Sci. 59:613–616, 625 (1994).
Osawa, T., Plant Antioxidants: Protective Role Against Oxygen Radical Species, Cosmetics & Toiletries Mag. 109:77–81 (1994).
Yoshida, H., and G. Kajimoto, Effects of Microwave Treatment on the Trypsin Inhibitor and Molecular Species of Triglycerides in Soybeans, J. Food Sci. 53:1756–1760 (1988).
Gray, J.I., Measurement of Lipid Oxidation: A Review, J. Am. Oil Chem. Soc. 55:539–546 (1978).
Logani, M.K., and R.E. Davies, Lipid Oxidation: Biologic Effects and Antioxidants—A Review, Lipids 15:485–495 (1980).
Jackson, H.W., Techniques for Flavor and Odor Evaluation of Soy Oil, J. Am. Oil Chem. Soc. 58:227–231 (1981).
Yen, G.C., S.L. Shyu, and T.C. Lin, Studies on Improving the Processing of Sesame Oil. I. Optimum Processing Conditions, Food Sci. 13:198–211 (1988).
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Abou-Gharbia, H.A., Shahidi, F., Adel, A. et al. Effects of processing on oxidative stability of sesame oil extracted from intact and dehulled seeds. J Amer Oil Chem Soc 74, 215–221 (1997). https://doi.org/10.1007/s11746-997-0126-9