蜀本草多糖的提取及抑菌活性研究

2014-04-29 02:42:40孙茜等
安徽农业科学 2014年36期

孙茜等

摘要[目的]研究蜀本草多糖的优化提取工艺和抑菌活性。[方法]通过提取温度、提取时间、料液比等单因素和正交试验对匀浆热水提法提取蜀本草多糖工艺进行了优化,同时利用所得多糖进行体外抑菌活性试验和热稳定性研究。[结果]蜀本草多糖提取最优条件为提取温度65 ℃、料液比(m/v)1∶45、提取时间75 min,多糖得率最高为6.28%;抑菌活性试验结果表明,蜀本草多糖提取物對酵母菌无明显抑制作用,对大肠杆菌、枯草芽孢杆菌和金黄色葡萄球菌有明显抑制作用;蜀本草粗多糖提取物在100 ℃及以下活性稳定。[结论]该研究为开发利用蜀本草多糖提供理论依据。

关键词蜀本草;多糖;正交试验;抑菌活性;热稳定性

中图分类号S567文献标识码A文章编号0517-6611(2014)36-12909-03

Abstract[Objective]The research aimed to study the extraction technology and the bacteriostatic activity of Portulaca oleracea L..[Method]The homogenate and hot water extraction method was used to gain the optimization extract condition of polysaccharides from Portulaca oleracea L. by orthogonal experiment.The purified polysaccharide was investigated about antibacterial activity and heat stability.[Result]The orthogonal experiment shows that the large yield of polysaccharide was 6.28% at 65 ℃, solventsolid ratio 1∶45,75 min. Antibacterial activity of the experiment shows that the polysaccharide had no significant inhibitory effect on saccharomycete,and it had obvious inhibitory effect on three bacteria (Escherichia coli, Staphylococcus aureus, Sacillus subtilis). The bacteriostatic stability of polysaccharide was active under 100 ℃.[Conclusion]The study provides the theoretical basis for the development and utilization of Portulaca oleracea L. polysaccharide.

Key wordsPortulaca oleracea L.; Polysaccharide; Orthogonal experiment; Antibacterial activity; Heat stability

蜀本草(Portulaca oleracea L.)为蜀本草科蜀本草属植物,属于药食同源的野生植物之一,不仅具有很高的营养价值,且具有清热解毒、利水去湿、散血消肿、除尘杀菌、消炎止痛、止血凉血等多种药理功能[1]。蜀本草含有丰富的植物多糖,而植物多糖在自然界中作为一种重要的天然活性物质,其最大的优点在于毒副作用小、资源来源广泛、成本低廉,且在高温下植物多糖的性质很稳定。因此,植物多糖被广泛应用于高效低毒药物和功能食品的研发中。研究表明,多糖的提取方法主要有水提法、酶提法、超声波法等[2]。该试验以匀浆+热水提法提取蜀本草多糖,并通过正交试验对该法进行了条件优化,最后对蜀本草多糖体外抑菌活性和热稳定性进行了初步探究,为合理有效开发利用蜀本草多糖提供理论依据。……

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