Effects of seed roasting temperature and time on the quality characteristics of sesame (Sesamum indicum) oil
1997
Yoshida, H. | Takagi, Shūji
The quality characteristics and composition of sesame oils prepared at different roasting temperatures (160-250 degrees C) from sesame seeds using a domestic electric oven were evaluated as compared to an unroasted oil sample: only minor increases (P < 0.05) in characteristics, such as peroxide value, carbonyl value, anisidine value and thiobarbituric acid reactive substances, of sesame oils occurred in relation to increasing roasting temperature and time between 160 and 200 degrees C, but colour units of oils increased markedly over a 220 degrees C roasting temperature. Significant decreases (P < 0.05) were observed in the amounts of triacylglycerols and phospholipids in the oils prepared using a 250 degrees C roasting temperature. The amounts of gamma-tocopherol and sesamin still remained over 80 and 90%, respectively, of the original levels after roasting at 250 degrees C. In the oil prepared using a 250 degrees C roasting temperature, sesamol was detected at 3370 mg per kg oil, but sesamolin was almost depleted after 25 min of roasting. Burning and bitter tastes were found in the oils prepared at roasting temperatures over 220 degrees C. The results suggested that a high-quality product would be obtained by roasting for 25 min at 160 or 180 degrees C, 15 min at 200 degrees C and 5 min at 220 degrees C when compared with the other samples.
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