Free and glycosylated sterol bioaccumulation in developing Cycas micronesica seeds.
Free and glycosylated sterol bioaccumulation in developing Cycas micronesica seeds.
复制标题
密克罗尼西亚苏铁种子发育过程中游离和糖基化甾醇的生物累积。
DOI：
10.1016/j.foodchem.2008.12.080
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发表时间：
2009
期刊：
影响因子：
8.8
通讯作者：
Shaw,ChristopherA
中科院分区：
文献类型：
--
作者：
Marler,ThomasE;Shaw,ChristopherA
测定了苏铁种子在个体发育过程中游离形式和糖基化形式的豆甾醇和β-谷甾醇的生物积累。在2 ~ 24个月期间，4种化合物的每种子库呈线性增长，表明发育期间没有引起生物积累速率的重大变化。斜坡不是均匀的，这表明随着种子成熟，相对甾醇剖面发生了变化。这种转变有利于糖苷，因为它们的积累速度超过了游离固醇。豆甾醇含量超过β-谷甾醇，但个体发生不影响这些优势甾醇的比例。人类在食用配子体制备的食物时所接触到的甾醇的数量和质量受到收获种子年龄的强烈影响。研究结果对于进一步了解人类神经退行性疾病与历史上食用来自种子配子体组织的食物之间的联系至关重要。
The bioaccumulation of free and glycosylated forms of stigmasterol and β-sitosterol were determined from Cycas micronesica K.D. Hill seeds throughout seed ontogeny. Per-seed pool of the four compounds increased linearly from 2 to 24 months, indicating no developmental period elicited a major shift in the rate of bioaccumulation. The slopes were not homogeneous, signifying a change in relative sterol profile concomitant with seed maturation. This shift was in favour of the glucosides, as their rate of accumulation exceeded that of the free sterols. Stigmasterol content exceeded that of β-sitosterol, but ontogeny did not influence the ratio of these dominant sterols. The quantity and quality of sterol exposure during consumption of foods prepared from gametophytes by humans is strongly influenced by age of harvested seeds. Results are critical for a further understanding of the link between human neurodegenerative diseases and historical consumption of foods derived from the seed gametophyte tissue.