Quantitation of steryl ferulate andp-coumarate esters from corn and rice
Quantitation of steryl ferulate andp-coumarate esters from corn and rice
复制标题
玉米和大米中阿魏酸甾醇酯和对香豆酸酯的定量
作者：
R. Norton
采用高效液相色谱法对加工玉米皮和玉米油、未精制和精制以及米糠和米糠油的不同馏分中的主要阿魏酸甾醇酯和对香豆酸甾醇酯进行了定量分析。结果表明，己烷提取的玉米油产生的酯的量是压榨机加工油的五倍以上。从麸皮和相关产品的酯的产率范围为0.07至0.54毫克/克麸皮。对于来自己烷提取的麸皮的油，未精制的玉米油具有0.18至8.6mg/g的水平。相比之下，米糠具有3.4mg/g米糠的酯水平，并且米糠油具有15.7mg/g油的水平。来自玉米的主要酯是阿魏酸谷甾烷酯和菜油烷酯，以及对香豆酸谷甾烷酯和菜油烷酯。米糠中的主要酯类是环木菠萝烯基、24-亚甲基-环木菠萝烷基和阿魏酸樟脑甾醇酯。米糠油具有低水平的24-亚甲基环木菠萝烷基，但高水平的环萜醇酯。所提供的数据提供了一个直接的比较阿魏酸甾醇和p-香豆酸水平在两种谷物，并将有助于选择最合适的来源，这些化合物从玉米产品的隔离。
The principal steryl ferulate andp-coumarate esters of different fractions from processed corn brans and corn oils, unrefined and refined, and from rice bran and rice bran oil were quantified by high-performance liquid chromatography. The results show that hexane-extracted corn oils yield more than five times the amount of esters compared to expeller processed oils. The yields of esters from bran and related products ranged from 0.07 to 0.54 mg/g of bran. Unrefined corn oils had levels from 0.18 to 8.6 mg/g for oil from hexane-extracted bran. By comparison, rice bran had ester levels of 3.4 mg/g of bran, and rice bran oil had levels of 15.7 mg/g of oil. The predominant esters from corn were sitostanyl and campestanyl ferulate, and sitostanyl and campestanylp-coumarate. The principal esters from rice bran were cycloartenyl, 24-methylenecy-cloartanyl, and campesteryl ferulate. Rice bran oils had low levels of 24-methylenecycloartanyl but high levels of cyclobranol esters. The data presented provide a direct comparison of steryl ferulate andp-coumarate levels in the two cereals, and will aid in selecting the most suitable sources for the isolation of these compounds from corn products.