EFFECT OF SOME HEAT TREATMENTS ON CHEMICAL COMPOSITION AND OIL CHARACTERISTICS OF SESAME                              SEEDS (Sesamum indicum L.)

Abo Khashaba, A. M.; Shaltout, Omayma E.; El-Difrawy, Entisar A.; Abou El-yazeed, A. M.; El- Sorady, M. E. I.

doi:10.21608/jfds.2014.53204

EFFECT OF SOME HEAT TREATMENTS ON CHEMICAL COMPOSITION AND OIL CHARACTERISTICS OF SESAME SEEDS (Sesamum indicum L.)

Document Type : Original Article

Authors

¹ Oil and Fat Department, Food Technology Research Institute, Agricultural Research Center, Giza, Egypt.

² Food Science Department, Faculty of Agriculture Saba Basha, Alex. University, Alexandria, Egypt.

10.21608/jfds.2014.53204

Abstract

Proximate chemical compositions of black and white sesame seeds (Sesamum indicum L.) were determined. The chemical properties after heat treatment of white seeds at 60 & 80ºC for (10 & 15 min) as compared to their raw counterparts were determined. Bioactive components of sesame oils, namely, lignans, tocopherols and total phenols were determined in raw black and white seeds then determined in white seeds after heating. Results indicated that the black and white sesame seeds contained high proportions of oil (52.82 and 56.24 %) and protein (20.14 and 20.91%), respectively. Sesame seeds were found to be good sources of minerals, where calcium exhibited the highest value among the other determined minerals in black seeds (0.97%) and (1.08%) in white seeds. Both Iron and Zinc were present in almost equal amounts in both seeds (372 & 230.6 mg/ kg) in white seeds and (340 & 289.4 mg/ kg) in black seeds, respectively. Palmitic and linoleic acids were the predominate fatty acids in sesame oil as measured by GC. After heating, the saturated fatty acids were increased while the unsaturated fatty acids were decreased. Lecithin and carob seeds powder were added to white tehina at different levels to delay the separation process of oil that might take place in tehina paste. Results showed that by adding carob seeds powder at (15 & 20%) significantly delayed separation time up to 45 & 60 days, respectively.

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