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Summary. Many animals use carotenoid pigments to color their integument and become
sexually attractive. These colorants can also serve physiological functions,
protecting cells and tissues from oxidative damage as well as stimulating the immune system.
Because animals often acquire several different carotenoid pigments from their diet,
there is the potential for different carotenoids to exhibit different free-radical-scavenging
or immunoenhancing activity. We experimentally tested how two common dietary
xanthophylls - lutein and zeaxanthin - may differentially affect the immune system in
male zebra finches (Taeniopygia guttata). Male
T. guttata derive their red sexual beak colorants from these two carotenoids, and
prior studies with this species have shown that lutein and zeaxanthin together boost cell-mediated
immunity. We experimentally elevated these two dietary carotenoids separately in two
groups of non-breeding zebra finches, but found that lutein-supplemented and zeaxanthin-supplemented
males mounted similar cell-mediated immune responses (to phytohaemagglutinin, or PHA).
Although zeaxanthin is a more conjugated carotenoid than lutein and has the potential
to be a more potent antioxidant, our study suggests that such a subtle structural
difference between these two biochemicals does not differentially affect immune
performance in this songbird. 相似文献
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报道了系统提取、分离宁夏乌拉尔甘草地上部分的色素类和生物黄酮类等有效成分的工艺及产品开发前景展望.最佳工艺是:料叶用95%的乙醇浸泡后,将色素类和黄酮类用石油醚分离,色素类可以制成叶绿素铜钠盐及叶黄素等,黄酮通过柱层析法制得含量大于80%的甘草叶黄酮产品.该工艺操作简单、连续,可以实现工业化生产. 相似文献
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