本文已被:浏览 1172次 下载 650次
投稿时间:2021-09-13
投稿时间:2021-09-13
中文摘要: 为探究甘薯叶提取物对酪氨酸酶活性的影响,利用不同极性溶剂萃取甘薯叶乙醇提取物,分别得到石油醚层、三氯甲烷层、乙酸乙酯层及正丁醇层萃取物,并采用多巴速率氧化法考察不同溶剂提取物对酪氨酸酶的抑制作用。结果表明,甘薯叶提取物中存在能抑制酪氨酸酶活性的物质,其中甘薯叶正丁醇萃取物对酪氨酸酶的抑制作用最明显,根据正丁醇萃取物抑制酪氨酸酶的Lineweaver-Burk双倒数拟合方程可得,甘薯叶提取物对酪氨酸酶的抑制作用是可逆过程,其抑制类型是混合型,KI与KIS分别为0.198、0.209 mg/mL,即甘薯叶提取物与游离酶的结合程度大于与酶-底物络合物的结合。
Abstract:In order to explore the effect of sweet potato leaf extracts on tyrosinase activity,ethanol extracts of sweet potato leaves were extracted with solvents of different polarities to obtain petroleum ether,chloroform,ethyl acetate,and n-butanol layers.The inhibitory effects of different solvent extracts on tyrosinase were investigated using the L-levodopa(L-DOPA)oxidation rate method.The results showed that sweet potato leaf extract contained substances that can inhibit tyrosinase activity,among which n-butanol has the most obvious inhibitory effect.According to the Burk double-reciprocal fitting equation of n-butanol extract inhibiting tyrosinase.The inhibitory effect of sweet potato leaf extract on tyrosinase was a reversible process of the mixed type with the KI and KISwere 0.198 mg/mL and 0.209 mg/mL,respectively,indicating that the degree of binding of the free enzyme was greater than that of the enzyme-substrate complex.
文章编号:202222002 中图分类号: 文献标志码:
基金项目:财政部和农业农村部国家现代农业产业技术体系项目(CARS-10-B19);浙江省重点研发项目(2021C02057);国家自然科学基金面上项目(31671750)
作者 | 单位 |
李盼盼1,杨胜祥2,庞林江1,陆国权3* | 1.浙江农林大学食品与健康学院,浙江 杭州 311300;2.浙江农林大学光机电工程学院,浙江 杭州 311300;3.浙江农林大学现代农学院,浙江 杭州 311300 |
引用文本: