Effect Of GAMMA Irradiation On Sesamol Contents In Sesame Seeds And Their Coats

The present study was carried out to determine sesamol content of raw and irradiated sesame seeds and their coats SC1 and SC2 at dose levels of 5, 10, 15, 20, 25 and 30 kGy using high performance liquid chromatography (HPLC). Sesame coat-1(SC1) and sesame coat-2 (SC2) were obtained as by-products after de-hulling and roasting processes during preparation of sesame paste (Tehina) for the manufacturing of Halawa tehinia. The extraction of sesame oil from sesame seeds and coats (SC1 and SC2) using a supercritical fluid extraction system (SFE-CO2) was carried out at 50 degree C, 350 bar and 2 ml CO2 /min using 5 min static followed by 25 min dynamic extraction. The effects of gamma rays on chemical composition and some minerals (sodium, potassium, calcium) of sesame seeds and coats (SC1 and SC2) were also investigated. The results showed that the gamma irradiation treatments did not induced any significant changes in the chemical composition and the minerals (sodium, potassium, calcium) of sesame seeds and their coats. The results showed that there was large variation between sesamol content in raw sesame seeds and sesame coats (SC1 and SC2). The distribution plot of sesamol contents in non-irradiated sesame seeds and coats (SC1 and SC2) showed that the values of sesamol were 18.365, 55.093 and 84.683 μg/g, respectively. The study exhibited extensive variability in sesamol contents among sesame seeds and their coats (SC1 and SC2). Moreover, gamma rays had detectable effects on sesamol contents in sesame seeds and coats (SC1 and SC2). It increased with increasing gamma irradiation dose and the highest values were observed for sesame coat-2.