title: Preparation and characterization of foxtail millet bran oil using subcritical propane and supercritical carbon dioxide extraction.
abstract: The foxtail millet (Setaria italica Beauv) bran oil was extracted with traditional solvent extraction (SE), supercritical carbon dioxide extraction (SCE) and subcritical propane extraction (SPE) and analyzed the yield, physicochemical property, fatty acid profile, tocopherol composition, oil oxidative stability in this study. The yields of foxtail millet bran oil by SE, SCE and SPE were 17.14 %, 19.65 %, 21.79 % of raw material weight (corresponded to 75.54 %, 86.60 %, 96.03 % of the total amount of the oil measured by using Soxhlet extraction), respectively. The effect of the extraction methods on the physicochemical properties (peroxide value, saponification value and color) was significant while the difference in fatty acid profile was negligible based on GC analysis. The major components of vitamin E in the obtained oils were identified as α- and β-tocopherols by HPLC, and SPE was superior to SE and SCE in the extraction of tocopherols. In Rancimat test, the oil obtained by SPE showed the highest oil oxidative stability, which could attribute to its high tocopherol content and low peroxide value. In view of oil quality, SPE employed smaller times and lower pressures compared to SE and SCE. SPE was a suitable and selective method for the extraction of the foxtail millet bran oil.
authors.affiliation: School of Food Science, Henan Institute of Science and Technology, Xinxiang, 453003 China.
authors.forename: Yuzhong
authors.initials: Y
authors.lastname: Shi
authors.affiliation: College of Grain and Food, Henan University of Technology, Zhengzhou, 450001 China.
authors.forename: Yuxiang
authors.initials: Y
authors.lastname: Ma
authors.affiliation: College of Grain and Food, Henan University of Technology, Zhengzhou, 450001 China.
authors.forename: Ruitin
authors.initials: R
authors.lastname: Zhang
authors.affiliation: School of Food Science, Henan Institute of Science and Technology, Xinxiang, 453003 China.
authors.forename: Hanjun
authors.initials: H
authors.lastname: Ma
authors.affiliation: School of Food Science, Henan Institute of Science and Technology, Xinxiang, 453003 China.
authors.forename: Benguo
authors.initials: B
authors.lastname: Liu
keywords: Fatty acid profile; Foxtail millet bran oil; Oil oxidative stability; Subcritical propane extraction; Supercritical carbon dioxide extraction; Tocopherol composition