Chemical characterization oxidative stability and in vitro antioxidant capacity of sesame oils extracted by supercritical and subcritical techniques and conventional methods: A comparative study using chemometrics

Abstract

In this study, profiles of chemical characterization, oxidative stability and in vitro antioxidant capacity of sesame oils obtained from supercritical and subcritical techniques and conventional methods were studied and compared. The results showed that a large proportion of fatty acid and triacylglycerol were not significantly influenced by the processing technologies (except for LLLn, SOA, C_18:3n-6 and C_22:0). However, significant differences of minor component, oxidation stability and free radical scavenging activity among the test oil samples were observed. Supercritical sesame oils were more excellent than the subcritical sesame oils and oils obtained from the traditional methods, especially in terms of γ-tocopherol, lignan and polyphenol contents and antioxidant capacity, thus indicating that CO₂ fluid technology was a desirable alternative to extract sesame oils with rich nutrition and superb physiological activity. Further, oils obtained from roasted sesame seeds exhibited higher oxidative stability and antioxidant capacity, thus declaring that high temperature roasting was a critical issue that influenced the quality of the final sesame oil product.

Practical applications: This study used two burgeoning technologies, namely supercritical and subcritical techniques for the practical applications of the extraction process of sesame oils from sesame (Sesamum indicum, L.) seeds. Supercritical fluid was an excellent technology to selectively extract bioactive compounds from sesame by using CO₂ as a carrier solvent. The use of CO₂ supercritical fluid in the present study was associated with high efficiency and antioxidant activities of the obtained sesame oils. These results indicate that this technology was an efficient and rapid method for extracting phytochemicals when compared with the conventional methods (hot pressing, cold pressing, solvent extraction and aqueous extraction), thus indicating that it had the potential to work as a satisfactory approach to produce specific sesame oil products for health care and cosmetic use. This method can be easily implemented on an industrial scale.

http://ift.tt/2xyuPVt