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.
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机译：用传统的溶剂萃取（SE），超临界二氧化碳萃取（SCE）和亚临界丙烷萃取（SPE）萃取谷子米（Setaria italica Beauv）麸皮油，并分析其收率，理化性质，脂肪酸谱，生育酚组成，油在这项研究中的氧化稳定性。 SE，SCE和SPE制成的谷子麸皮油的产率为原料重量的17.14％，19.65％，21.79％（分别对应于使用索氏提取法测得的油总量的75.54％，86.60％，96.03％） ， 分别。根据GC分析，提取方法对理化性质（过氧化物值，皂化值和颜色）的影响显着，而脂肪酸谱的差异可忽略不计。 HPLC将所得油中维生素E的主要成分鉴定为α-和β-生育酚，在提取生育酚时，SPE优于SE和SCE。在Rancimat测试中，通过SPE获得的油显示出最高的油氧化稳定性，这可能归因于其生育酚含量高和过氧化物值低。考虑到油的质量，与SE和SCE相比，SPE使用的时间更短，压力更低。 SPE是提取谷尾米糠油的合适且选择性的方法。
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