| Antioxidant activity of sesamol was verified by adding pure sesamol in cold pressed sesame oil. The sesamolin was decomposed into sesamol and sesaminol catalyzed by phosphotungstic-heteropoly(HPW). The effects of dosage of HPW, reaction temperature and reaction time on acid catalysis experiment were investigated to improve the oxidative stability of cold pressed sesame oil. The results showed that a certain content of pure sesamol could improve the oxidative stability of cold pressed sesame oil effectively. The oxidation time (OSI) extended from 4.20 h to 6.62 h when adding 100 mg/100 g sesamol. Under the conditions of dosage of HPW 0.8%, reaction temperature 80?℃ and reaction time 120 min, sesamolin transformed completely, and the OSI of cold pressed sesame oil was 9.32 h. The acid value, peroxide value and saponification value of cold pressed sesame oil catalyzed by HPW increased in different degrees and the color decreased, but the scopes of the changes were small. The indexes were within the first grade sesame oil of national standard. There was not a great effect on quality of cold pressed sesame oil. |
