Content of γ-oryzanol and composition of steryl ferulates in brown rice (Oryza sativa L.) of European origin
Content of γ-oryzanol and composition of steryl ferulates in brown rice (Oryza sativa L.) of European origin
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DOI：
10.1021/jf061688n
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发表时间：
2006-10-18
影响因子：
6.1
通讯作者：
Engel, Karl-Heinz
中科院分区：
文献类型：
--
作者：
Miller, Andreas;Engel, Karl-Heinz
采用液相色谱-气相色谱联用技术（LC-GC）测定了欧洲产糙米中γ-谷维素的含量和阿魏酸甾醇酯的组成。对30个不同品种、不同地点和不同季节的糙米样品进行分析，发现γ-谷维素含量在26 - 63 mg/100 g之间。γ-谷维素的主要成分是阿魏酸环木菠萝烯酯和阿魏酸24-亚甲基-环木菠萝烷酯，其次是阿魏酸樟脑甾醇酯、阿魏酸樟脑甾烷酯和阿魏酸β-谷甾醇酯。个别甾醇阿魏酸酯的比例表现出巨大的变化。然而，尽管观察到单个阿魏酸甾醇酯的变化很大，但阿魏酸4，4 '-二甲基甾醇酯（阿魏酸环木菠萝烯酯、阿魏酸24-亚甲基-环木菠萝烷酯）的总和和阿魏酸4-去甲基甾醇酯（阿魏酸樟脑甾醇酯、阿魏酸樟脑甾烷酯和阿魏酸β-谷甾醇酯）的总和的比例相当恒定。γ-谷维素含量和阿魏酸甾醇的组成观察到显着的自然变异被证明是受环境条件的影响，但不成熟的水稻籽粒的程度。
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-methylene-cycloartanyl 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-methylene-cycloartanyl 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.