银耳源糖醛酸制备工艺及体外抗氧化活性研究
2020-08-03高云杉陈洋炜郑明锋杨成龙
高云杉 陈洋炜 郑明锋 杨成龙



摘 要:以银耳多糖为原料,采用酸水解法制备葡萄糖醛酸。以葡萄糖醛酸得率为指标,运用单因素和正交试验设计对水解条件进行优化并制备银耳糖醛酸,检测其体外抗氧化活性。结果表明,酸水解制备银耳糖醛酸的最佳工艺条件如下:水解温度80℃,水解时间6h,盐酸浓度1mol/L,底物浓度0.8mg/mL,葡萄糖醛酸得率(32.03±1.70)%。与银耳多糖、葡萄糖醛酸的体外抗氧化活性对比,银耳糖醛酸的抗氧化活性要显著优于银耳多糖和葡萄糖醛酸。
关键词:葡萄糖醛酸;银耳多糖;制备;体外抗氧化
中图分类号 S567.3+4文献标识码 A文章编号 1007-7731(2020)09-0022-06
Study on Preparation of Tremella Glucuronic Acid and its Antioxidant Activity in Vitro
Gao Yunshan1 et al
(1School of Food Science, Fujian Agriculture and Forestry University, Fuzhou 350000, China)
Abstract: The glucuronic acid were obtained by acid hydrolysis from Tremella polysaccharide. The yield rate of glucuronic acid was used as the index to optimize the preparation condition for glucuronic acid by orthogonal design depended on the results of single factor experiments. Results showed that the yield rate of Tremella glucuronic acid was at 32.03%±1.70% under the optimal conditions: the hydrolysis at 80℃ for 6 hours, hydrochloric acid concentration of 1mol/L, substrate concentration of 0.8mg/mL. The antioxidant activity of tremella glucuronic acid was better than that of glucuronic acid and tremella polysaccharide.
Key words: Tremella Polysaccharide; Glucuronic Acid; Preparation; Antioxidant Activity in vitro.
葡萄糖醛酸(Glucuronic acid)簡称葡糖醛酸,广泛存在于动植物体内,它的分子式为C6H10O7,分子量为194.14[1]。葡萄糖醛酸分子中同时存在高反应活性的醛基和羧基,可与人体内源性及外源性有毒物质中的羟基、巯基、羧基、氨基等相互作用,从而达到排毒养颜、促进代谢的目的[2]。有研究表明,糖醛酸含量与其抗氧化活性呈正相关[3]。目前,葡萄糖醛酸的生产方法主要有生物发酵法、化学氧化法、多糖水解法等[4]。但生物发酵法所用的酶及菌株的筛选与制备过程繁琐、成本高且收率极低,目前,仅用于实验探索[5]。当前工业化生产葡萄糖醛酸主要是采用浓硝酸氧化淀粉的化学氧化法,但污染严重、能耗高、成本大[6]。多糖水解法多采用动植物多糖经过酸碱水解生产糖醛酸,原料天然多样、来源广泛,对开展大宗农副产品深加工和综合利用、合理利用自然资源有着重要意义。……
