1. 1. 毕业设计(论文)的内容、要求、设计方案、规划等
1.前言
黄芩苷和黄芩素是黄芩中的主要有效成分,具有抗氧化、抗菌消炎、抗病毒、抗肿瘤及止血安胎等药理作用。黄芩苷在人体内吸收差、转化率低。药代动力学研究表明:其口服制剂需经胃肠道菌丛酶解或肝微粒体转化为黄芩素后被吸收。黄芩素的生物利用度和药理活性均高于黄芩苷,但在黄芩中含量低、易被氧和碱破坏、生产成本高,从而使其应用受到了很大的限制。
黄芩中黄芩素的含量很低,质量分数为0.04%-0.28%。直接提取难道大、成本高。而黄芩苷易提取。黄芩苷与黄芩素具有相似的化学结构,只是黄芩苷比黄芩素在7位多了一个葡萄糖醛酸残基。因此通过对黄芩苷水解有望大量获得黄芩素。
2. 参考文献(不低于12篇)
[1] K. Goyal, P. Selvakumar, K. Hayashi Characterization of a thermostable β-glucosidase (BglB) from Thermotoga maritima showing transglycosylation activity. Journal of Molecular Catalysis B: Enzymatic 15 (2001) 4553
[2] Pernilla Turner,A novel variant of Thermotoga neapolitana β-glucosidase B is an efficient catalyst for the synthesis of alkyl glucosides by transglycosylation. Pernilla Turner 130 (2007) 6774
[3] Pontus Lundemo, Patrick Adlercreutz, Eva Nordberg Karlsson ,Improved Transferase/Hydrolase Ratio through Rational Design of a Family 1β-Glucosidase from Thermotoga neapolitana. Applied and Environmental Microbiology.June 2013 Volume 79 Number 11.
