金樱子鞣质提取率影响因素分析及提取条件优化
2015-03-13晏建新王晓丽
晏建新 王晓丽
[摘要] 目的 优化金樱子中鞣质的超声提取工艺。 方法 采用磷钼钨酸-紫外分光光度法测定鞣质含量,在单因素试验的基础上,选取液料比、超声提取时间和乙醇百分浓度作为自变量,金樱子鞣质提取率为因变量,对自变量各水平进行多元线性回归和二项式拟合,采用星点设计-响应面法选择最佳工艺条件,并进行预测分析。 结果 最佳工艺为:乙醇浓度75%,料液比1∶30,超声提取时间60 min,提取温度为50℃。 结论 优化的金樱子中鞣质超声波提取工艺简便可靠、稳定、提取率高,为金樱子中鞣质的开发利用奠定基础。
[关键词] 金樱子;鞣质;超声提取;响应面法
[中图分类号] R284.2 [文献标识码] A [文章编号] 1673-7210(2015)02(b)-0099-04
[Abstract] Objective To optimize the process of ultrasonic extracting effective constituents from Rosa Laevigatae Fructus of tannin. Methods The content of tannin was determined by phosphomolybdotungsitc acid-UV spectmphotometry solvent. Based on single-factor tests, with ethanol percent, solid-liquid ratio, extraction time as independent variables and yield of tannin from Rosa Laevigatae Fructus as dependent variable, multiple linear regression and binomial fitting was adopted by central composite design model, and determine optimum extraction technology, and the forcast analysis was done. Results The best extraction process was as followed: the concentration ethanol of 75%, ratio of solid-liquid of 1∶30, extraction time of 60 min, extraction temperature of 50℃. Conclusion This optimized extraction process is simple and reliable, it can laid a certain foundation for development and utilization of tannins from Rosa Laevigatae Fructus.
[Key words] Rosa Laevigatae Fructus; Tannin; Ultrasonic extraction; Response surface method
金樱子是蔷薇科植物金樱子(Rosa laevigata Michx.)的干燥成熟果实[1],又名蜂糖罐,在我国大多数地方均有分布,特别是贵州省分布广,产量高[2]。金樱子药食同源[3],具有补肾固精、止泻之功效。化学成分研究多为多糖类和黄酮类,对鞣质类研究较少。鞣质具有收敛性,内服可治胃肠道出血、水泻等症,被认为是良好的天然抗氧化剂[4]。鞣质是一类次生代谢产物,植物界广泛存在,近几年的研究表明鞣质具有较好的抗肿瘤活性[5]。
星点设计是在二水平析因设计的基础上,加中心点和星点组成,实验次数较少,对非线性拟合的实验设计较适宜,具有实验设计简单、试验次数少、精密度高的特点[6]。响应面法集数学和统计学方法于一体,是建模和多元变量最优化的一种统计方法[7]。对于中药有效成分的提取工艺研究,星点设计以及效应面优化法是重要的实验条件设计、优化方法之一,具有数据量大、预测性好、直观的优点,比正交和均匀设计更适用于探索性的试验研究。……
