Effect of far-infrared irradiation on the antioxidant activity of defatted sesame meal extracts.
To determine the effect of far-infrared (FIR) irradiation on the antioxidant activities of sesame meal, half of sesame seeds were FIR-irradiated and then oil was extracted from the seeds. The resulting defatted sesame meal (DSM) was extracted with methanol, and the antioxidant activities of methanolic extract were determined. FIR irradiation of sesame seeds for 30 min increased the total phenol content from 34.0 to 59.0 muM and radical scavenging activity of DSM extracts from 26.40 to 68.76%. The induction time of lipid oxidation of oil added to extracts was also retarded from 0.82 to 0.96 h. According to the gas chromatography-mass spectrometry analysis, several low molecular weight phenolic compounds, such as p-hydroxy benzoic acid, vanillic acid, p-coumaric acid, isoferulic acid, and o-coumaric acid, were frequently detected in FIR-irradiated DSM extracts as compared to unirradiated ones. These results indicated that FIR irradiation of sesame seeds increased the antioxidant activity of methanolic extracts of DSM.
Lee
Seung-Cheol
SC
Division of Food Science and Biotechnology, Kyungnam University, Masan 631-701, Korea. sclee@kyungnam.ac.kr
Jeong
Seok-Moon
SM
Kim
So-Young
SY
Nam
K C
KC
Ahn
D U
DU
D000975:Antioxidants / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry; D007259:Infrared Rays; D000432:Methanol; D010636:Phenols / Q000032:analysis / Q000737:chemistry; D010936:Plant Extracts / Q000737:chemistry; D012639:Seeds / Q000737:chemistry; D012715:Sesame Oil / Q000737:chemistry*; D031685:Sesamum / Q000737:chemistry* / Q000528:radiation effects
D000975:Antioxidants; D010636:Phenols; D010936:Plant Extracts; D012715:Sesame Oil; D000432:Methanol