安全验证
安徽农学通报,Anhui Agri.Sci.Bul1.2015,21(19) l9 白芨多糖的抑菌作用研究 代建丽 周斯荻 刘铭轩 史玉恒 张国彬 吴业颖 (武昌理工学院生命科学学院,湖北武汉430223) 摘要:以水提醇沉法提取白芨多糖,应用滤纸片法研究白芨多糖对大肠杆菌、变形杆菌、金黄色葡萄球菌和 枯草芽孢杆菌的生长抑制作用,并测定大肠杆菌茵液的电导率、碱性磷酸酶含量和蛋白质含量探讨白芨多糖 的抑茵机理。结果表明,白芨多糖对4种茵的生长均有抑制作用,20mg/mL的白芨多糖抑茵效果较好,白芨多 糖可导致大肠杆菌细胞壁和细胞膜的通透性增大,引起细胞内容物外泄而起到抑茵作用。 关键词:白芨多糖;抑茵活性;抑茵机理 中图分类号Q946.3 文献标识码A 文章编号1007—7731(2015)19一l9—03 Study on the Antibacterial Activity of Bletilla striata Polysaccharide Dai Jianli et a1. (College of Life Science,Wuchang University of Technology,Wahan 430223,China) Abstract:Water——soluble polysaccharides were separated from Bletilla striata by hot——water extraction and its anti— bacterial activity against Escherichia coli,Proteus vulgaris,Staphyloccocus aureus and Bacillus subtilis were studied with filter method.The changes in electric conductivity,alkaline phosphatase(AKP)content and protein concentra— tion in the medium were measured to study the antibaeterial mechanism.Results showed that the polysaccharides 0f BletiUa striata had antibacteril actiavity against the four bacteria and had strong inhibition effect at the concentration of 20mg/mL.The permeability of cell membrane and cell wall of Escherichia coli were increased after treated with Bletilla striata polysaccharide,which resulted in the release of cell components. Key words:BletiUa striata polysaccharide;Antibacterial activity;Antibaeterial mechanism 中药白芨为兰科植物白芨(Bletilla striata(Thunb.) Reichb_£)的干燥块茎,具有收敛止血、消肿生肌之功效, 1.1材料 白芨购自武汉国药股份有限公司中药饮片 厂;金黄色葡萄球菌(Staphyloccocus aureus)、枯草芽抱杆 菌(Bacillus subtilis)、大肠杆菌(Escherichia coli)、变形杆 菌(Proteus vulgaris)购于武汉大学中国典型培养物保藏 中心,武昌理工学院生科院实验室活化保存。 1.2方法 临床上广泛用于治疗咳血、吐血、溃疡疼痛、手足皲裂等 症。现代研究显示,白芨的主要药用成分为白芨胶,又称 白芨多糖 。白芨甘露聚糖胶浆对人上消化道出血有良 好的止血疗效 。白芨多糖能促进大鼠背部切割伤创面 的创伤愈合 ,