超声波提取陕北红枣多酚

研究超声波法提取陕北红枣中多酚的最佳提取条件。(1)考察了红枣多酚提取的最佳方法和最佳溶剂;(2)考察超声提取时间、溶剂浓度、料液比三个因素对多酚提取率的影响。并在单因素实验的基础上设计L9(33)正交实验。结果:最佳方法为超声波提取>索式提取>普通回流>室温浸提。提取溶剂为乙醇。提取陕北红枣中多酚的最佳工艺条件组合为:70%(V/V)乙醇、料液比为1∶40、超声提取30 min、提取3次。多酚得率为444.6 mg/100 g。由几种提取方法比较,可知超声波提取有明显的优势:提取时间短、温度低、不会使多酚分解且操作简单。

Extraction of Polyphenol from Chinese Dates in North of Shaanxi with Ultrasonic Wave

To study the best method to extract polyphenol from Chinese Dates in north of Shaanxi with ultrasonic wave.(1)select the best method and solvent;(2) The effect of single factor on the extract rate of polyphenol was observed from extract time,alcohol concentration,feed liquid ratio and an orthogonal experiment L9(33)were conducted on the base of the single factor experiment.It is resulted:(1) The extraction rate by supersonic>traditional refluence>soxhlet extraction>dipped in solvent and extracted at room temperature,the best solvent was alcohol.(2) The best technology for the extraction of the polyphenol from Chinese Dates was the alcohol concentration was 70 %(V/V),the feed liquid ratio was 1∶ 40,30min for three times with ultrasonic wave.The content of polyphenol from Chinese Dates in north of Shaanxi is 444.6 mg/100g.It is conclused that : extraction of polyphenol by ultrasonic wave is much better than the other method as it has shorter extraction time and lower temperature,so polyphenol would not be decomposed and can got it easily.