摘要
该研究采用十二烷基硫酸钠-聚丙烯酰胺凝胶电泳(SDS-PAGE)和双向电泳(2-DE)技术分析比较了鲜冬虫夏草(S1)以及经过22℃阴干(S2)、37℃晒干(S3)和60℃烘干(S4)的冬虫夏草样品中蛋白质成分的变化。Bradford法蛋白含量测定结果显示,4种冬虫夏草样品总蛋白质量分数在1. 655~4. 493 mg·g-1,其中鲜冬虫夏草的蛋白含量最高。SDS-PAGE结果显示,冬虫夏草样品蛋白质的相对分子质量主要分布在10~100 k Da,含有的蛋白条带数28~41条,鲜冬虫夏草含有的蛋白条带数量最多。通过PDQuest软件处理冬虫夏草样品2-DE凝胶图谱,结果显示,冬虫夏草蛋白质的等电点主要分布在p I 4. 5~6. 5,相对分子质量主要分布在2个区域10~20 k Da和25~100 k Da,共检测到488~876个蛋白点,鲜冬虫夏草含有的蛋白点数量最多。因此,鲜冬虫夏草含有蛋白成分含量和总类最多,干燥过程会引起冬虫夏草蛋白含量和种类的减少,不同的干燥方法对药材蛋白的影响也不一样,该结果可为冬虫夏草干燥工艺的提升提供参考。
In this study,the protein in different Cordyceps samples,which include fresh sample( S1),22 ℃ drying sample( S2),37 ℃ drying sample( S3) and 60 ℃ drying sample( S4),were analyzed by sodium dodecylsupinate-polyacrylamide gel electrophoresis( SDS-PAGE) and two-dimensional electrophoresis( 2-DE). The total protein contents in Cordyceps samples were from 1. 655-4. 493 mg·g-1 and the protein contents in fresh sample was the highest. The results of SDS-PAGE showed that the mainly ranges of protein molecular weight of Cordyces samples were 10-100 kDa and the numbers of protein bands were 28 to 41,the fresh sample had the maximum number of protein bands. The 2-DE profiles were analyzed by PDQuest software. The resulted indicated that 488-876 protein spots were detected in different Cordyceps samples and the isoelectric point( pI) was distributed between 4. 5 and 6. 5,the protein molecular weight was distributed in 10-20 kDa and 25-100 kDa,the fresh sample had the maximum number of protein spots. Therefore,the drying process could decrease contents and species of protein in Cordyceps,and the different drying conditions had different effects on protein. These results provide a reference for improving the drying process of Cordyceps.
作者
钱正明
樊娇娇
李春红
杨丰庆
李文佳
QIAN Zheng-ming;FAN Jiao-jiao;LI Chun-hong;YANG Feng-qing;LI Wen-jia(State Key Laboratory of the State Administration of Traditional Chinese Medicine, Sunshine Lake Pharma Co., LTD, Dongguan 523850, China;School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China)
出处
《中国中药杂志》
CAS
CSCD
北大核心
2019年第10期1983-1988,共6页
China Journal of Chinese Materia Medica
基金
东莞市院士工作站项目(DGYSZ-2018-03)
