红薯叶总黄酮的提取工艺优化及其抑菌、抗氧化活性研究

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红薯叶总黄酮的提取工艺优化及其抑菌、抗氧化活性研究

文章编号:1006-1126-2018(3)-0311-05

摘要:以红薯叶提取物中总黄酮含量(以芦丁标准品为对照)为评价标准,利用单因素试验,着重考察提取时间(A )、提取料液比(B )、乙醇浓度(C )对红薯叶黄酮提取效果的影响,选用L 9(34)正交试验设计,优化红薯叶总黄酮的提取工艺,得到最佳工艺条件:60%乙醇溶液,料液比为1∶40(m/V ),回流1.5h ,总黄酮提取率平均可达8.81%。该工艺在实验室规模(200.0g )具有很好的稳定性,具有一定的工业开发潜力。对红薯叶总黄酮提取物进行体外抗氧化作用(1,1-二苯基-2-苦基肼自由基(DPPH ·)的清除)和体外抑菌(金黄葡糖球菌、大肠杆菌、肺炎克雷伯

菌、伤寒杆菌和黑曲霉菌)效果研究。结果显示:红薯叶黄酮提取物对DPPH ·的清除效果显著,有明显的抗氧化效果。红薯叶总黄酮提取物对金黄葡糖球菌和大肠杆菌具有较好的抑制作用,在高剂量条件下抑菌率最高,分别达到108.66%、115.89%,MIC 分别为5.02、10.05mg/mL ,具有较好的抑制活性,有很高的开发价值。关键词:红薯叶;总黄酮;提取工艺;抗氧化活性;抑菌活性中图分类号:R284.2文献标识码:A

收稿日期:2018-03-19

基金项目:商洛学院科学与技术研究基金项目(17SKY005);2017年陕西省大学生创新创业训练计划项目(20172715)第一作者:延永(1988—),男,硕士研究生,研究方向:药物合成。

延永1,李玉萌2,张亦琳1,王

溪2,简丽萍1

(1.商洛学院生物医药与食品工程学院,陕西商洛726000;2.商洛学院健康管理学院,陕西商洛726000)

Optimization of Extraction Technology of Flavonoids from Sweet Potato Leaves

and Antimicrobial and Antioxidant Activity

YAN Yong 1,LI Yu-meng 2,ZHANG Yi-lin 1,WANG Xi 2,JIAN Li-ping 1

(1.College of Biology Pharmacy and Food Engineering ,Shangluo University ,Shangluo ,Shaanxi 726000,China ;

2.College of Health Management Address ,Shangluo University ,Shangluo ,Shaanxi 726000,China )

Abstract:Using the content of flavonoids extracted from sweet potato leaves as the evaluation criterion (rutin standard was control group ),the effects of time (A ),extraction liquid ratio (B ),and ethanol concentration (C ))on flavonoid extracts were analyzed by single factor test.The extraction process was optimized by L 9(34)orthogonal design.The optimum condition was that the extraction liquid ratio was 1∶40(m/V )with 60%eth ⁃anol solution and refluxed for 1.5hours.The average extraction rate of total flavonoids reached to 8.81%.The process had good stability in laboratory scale (200.0g )and certain industrial development potential.In vitro antioxidant activity test (removal of 1,1-diphenyl-2-picrylhydrazyl free radical (DPPH ·))and in vitro antibacterial activity test (Staphylococcus aureus ,Escherichia coli ,Klebsiella pneumoniae ,Salmonella typhi ,and Aspergillus niger )were carried out and results showed that the flavonoid extracts of sweet potato leaves had significant effect on removal of DPPH ·and antioxidation.Flavonoid extracts of sweet potato leaves had a good inhibitory effect on S.aureus and E.coli ,and the inhibitory rates was 108.66%and 115.89%un ⁃der the high dosages ,respectively ,and the minimum inhibitory concentration (MIC )was 5.02mg/mL and 10.05mg/mL ,respectively.Extracts of sweet potato leaves had a good inhibitory activity and a high develop ⁃ment value.

Key words:sweet potato leaf ;total flavonoids ;extraction process ;antioxidant activity ;antibacterial activity

第47卷第3期2018年9月

广西林业科学Guangxi Forestry Science

Vol.47No.3Sep.2018

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