桑叶中性部位一种化学成分分离鉴定

目的:利用现代色谱技术和光谱方法,研究桑叶中性部位的微量化学成分。方法:通过溶剂提取;采用硅胶、大孔吸附树脂、亲脂性凝胶(Lipophilic Sephadex LH-20)、制备液相等多种柱色谱方法分离化学成分;理化性质及UV、IR、1H-NMR、13C-NMR、2D-NMR、MS及ESI-HR-MS等光谱技术鉴定结构,对桑叶中性部位化学成分进行了研究。结果:从中分离得到八个化合物,本文鉴定了其中一个为(+)-紫丁香树脂酚-O-β-D-葡萄糖苷。结论:化合物(+)-紫丁香树脂酚-O-β-D-葡萄糖苷为首次从桑属植物中分离得到。

Sequence polymorphism of human mitochondrial DNA control region in Chinese Dongxiang unrelated individuals

Objective: To investigate the mitochondrial DNA sequence polymorphism in Chinese Dongxiang ethnic group and to provide basic data used in ethnic origin investigation and forensic purpose. Methods: Genomic DNA was extracted from the whole blood of 100 unrelated individuals of Chinese Dongxiang ethnic group by standard Chelex-100 method. The sequence polymorphism was determined by PCR amplification and direct sequencing. Results: Eighty-two polymorphic sites were identified in mtDNA D-loop region 16 091 - 16 418 np, and 88 haplotypes were found. The genetic diversity was calculated to he 0.9969, and the genetic identity was 0.013 2. Conclusion: There are some particular polymorphic sites in Chinese Dongxiang ethnic group, and these sites provide an important basis to investigate the origin of Dongxiang and the relationship between Dongxiang and other ethnic groups. The result also suggested that sequence polymorphism from 16 091 -16 418 np in human mitochondrial DNA control region can be an useful tool for forensic identity.