Research On Key Control Technology Of Quality And Safety(BaP) And Production Process Of Sesame Oil

Benzopyrene (BaP) is a carcinogenic, teratogenic and mutagenic environmental pollutant which is internationally recognized. The content of BaP shouldn’t be more than lOppb in the edible vegetable oil that specified in GB2716-2005--"Hygienic standard for edible vegetable oil". Its content of edible vegetable oil is associated with material quality of, manufacturing technique and technological conditions of oil plants and edible oil, while the particular manufacturing technique can increase BaP. For this reason, it is significant to study the main technology of BaP in the sesame oil to ensure the quality safety of sesame oil.The improper factor with high temperature is possible to aggravate BaP in the production of sesame oil. Hence, we focus on the factors with different roasting temperatures and timel. The results showed that the BaP content was2.05μg/kg extracted from white sesame seed grown in XiangCheng of Henan Province, which exceeded2μg/kg compared to the standard of EU, while it was far below the hygienic standard of our country. The sesame oil was creamy yellow. The BaP content presented an overall increasing trend with prolonged time at180℃and260℃,and the previous content was higher than the latter. Moreover, it had larger rangeability with prolonged roasting time at200℃. At first the content decreased, then increased obviously with prolonged roasting time at220℃and240℃. The lowest content appeared on20min (1.17μg/kg) and30min (0.7μg/kg) respectively. AS roasting temperature and roasting time were prolonged, the oil color became deeper. In consideration of other indexes of sesame oil, such as the acid value, peroxide value, active ingredients, odour et al, we suggested to use200℃and15min-20min as the roasting condition.This paper was focus on the removal of bonzopyrene from sesame oil by using different reagents and adsorbent dosage. Under condition of110℃, vacuum degree of0.095Mpa and mixing for30min, the results show that when added5%activated clay to the content of18.6μg/kg BaP artificially, the limit amount of residue was13.13lg/kg. The BaP residue was4.7μg/kg when added2%ordinary activated carbon, and it decreased to8.35lg/kg and8.44μg/kg as added0.1%NORIT8014-2activated carbon and NORIT8014-2activated carbon, respectively. While the NORIT8014-2and NORIT8014-2increased to0.2%, the BaP residue decreased to1.03μg/kg and1.62μg/kg, severally. The residues of BaP are5.51μg/kg,4.6μg/kg and6.39μg/kg when we add the mixture of activated clay and oridinary activated carbon(3%+0.3%), NORIT8014-2activated carbon(3%+0.05%), NORIT8015-2 activated carbon(3%+0.05%) respectively. With the increasing of the additive adsorbent amount of3%+0.8%,3%+0.15%,3%+0.15%, BaP residue are1.73μg/kg、0.86μg/kg、0.90μg/kg. NORIT8014-2activated carbon and NORIT8014-2activated carbon had a significantly better effect on removing BaP than ordinary activated carbon, and the mixed adsorbent had a better effect on removing BaP than using one adsorbent, separately.According to experimental results, roasting and adsorption refining process were the key elements to obtain the high quality sesame oil. So two parts of the process were need to be taken in to consideration, one is squeezing system process after wetting, using sieve-eliminating stone-magnetic separation and roasting with wet condition of15min-20min at200℃; The other is adsorption refining process with mixed reagent, and the adsorption refining conditions were as follows:with temperature of110℃, roasting for30min, under the vacuum degree of0.095Mpa and stirring. The ratio of hybrid adsorbent was3%+0.15%(activated clay+NORIT activated carbon).