Miller Andreas, Engel Karl-Heinz
Technische Universität München, Lehrstuhl für Allgemeine Lebensmitteltechnologie, Am Forum 2, D-85350 Freising-Weihenstephan, Germany.
J Agric Food Chem. 2006 Oct 18;54(21):8127-33. doi: 10.1021/jf061688n.
The content of gamma-oryzanol and the composition of steryl ferulates were determined in brown rice of European origin using on-line coupled liquid chromatography-gas chromatography (LC-GC). Analysis of 30 brown rice samples of various cultivars, grown at different sites and in different seasons, revealed the gamma-oryzanol content to range from 26 to 63 mg/100 g. Cycloartenyl ferulate and 24-methylenecycloartanyl ferulate were the major components of gamma-oryzanol followed by campesteryl ferulate, campestanyl ferulate, and beta-sitosteryl ferulate. The proportions of individual steryl ferulates exhibited enormous variability. However, irrespectively of the great variations observed for single steryl ferulates, the proportions of the sum of 4,4'-dimethylsteryl ferulates (cycloartenyl ferulate, 24-methylenecycloartanyl ferulate) and the sum of 4-desmethylsteryl ferulates (campesteryl ferulate, campestanyl ferulate, and beta-sitosteryl ferulate) were rather constant. The significant natural variability observed for gamma-oryzanol content and composition of steryl ferulates were shown to be influenced by environmental conditions but not by the degree of maturity of rice grains.
采用在线联用液相色谱 - 气相色谱法（LC - GC）测定了欧洲产糙米中γ - 谷维素的含量以及甾醇阿魏酸酯的组成。对30个不同品种、在不同地点和不同季节种植的糙米样品进行分析后发现，γ - 谷维素的含量在26至63毫克/100克之间。阿魏酸环阿屯酯和阿魏酸24 - 亚甲基环阿屯酯是γ - 谷维素的主要成分，其次是阿魏酸菜油甾醇酯、阿魏酸菜油甾烷醇酯和阿魏酸β - 谷甾醇酯。各个甾醇阿魏酸酯的比例表现出极大的变异性。然而，尽管单个甾醇阿魏酸酯存在很大差异，但4,4'-二甲基甾醇阿魏酸酯（阿魏酸环阿屯酯、阿魏酸24 - 亚甲基环阿屯酯）之和与4 - 去甲基甾醇阿魏酸酯（阿魏酸菜油甾醇酯、阿魏酸菜油甾烷醇酯和阿魏酸β - 谷甾醇酯）之和的比例相当恒定。结果表明，γ - 谷维素含量和甾醇阿魏酸酯组成所观察到的显著自然变异性受环境条件影响，但不受稻谷成熟度的影响。
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