采用复合酶法对猴头菇多糖进行提取,以猴头菇多糖得率和纯度的综合指标为评价指标,研究了酶添加量、酶解温度、酶解时间、酶解p H 4个因素对提取效果的影响。在单因素试验的基础上,通过Box-Behnken响应面法优化猴头菇多糖的提取工艺条件。建立了多糖综合指标Y与酶添加量A、酶解温度B、酶解时间C、酶解p H D之间的回归方程:Y=24.91+0.011A-0.38B-0.100C-0.22D-0.27AB+0.024AC+3.250E-003AD-0.61BC+6.250E-003BD+1.500E-003CD-0.79A2-0.79B2-1.19C2-0.75D2。最终确定最佳酶解条件为酶添加量0.51%,酶解温度48.71℃,酶解时间100.50 min,酶解p H4.43。在此条件下多糖的得率为19.22%,纯度为38.39%,综合指标为24.97%。
As an exploration of synthesizing gallotannins,the natural products with versatile biological activities 3 o galloyl D glucose (7) was prepared from gallic acid (1) and D glucose (3).The phenol hydroxyl groups of gallic acid were protected by benzylation which was cleaved subsequently by 10% palladised charcoal,and the four hydroxyl groups (1,2,4,6 ) of glucose shielded by isopropylation followed by acid hydrolysis.The structure was elucidated from the data of thin layer chromatography(TLC) and NMR spectrum.
