茶花粉黄酮对α-葡萄糖苷酶抑制作用的研究
Study on α- glucosidase inhibitory activity of the flavonoids extract from Camellia bee pollen
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摘要: 为研究茶花粉黄酮对α-葡萄糖苷酶的抑制作用,以茶花粉为原料,将提取、萃取及大孔吸附树脂处理得到的10个组分分别进行黄酮含量及α-葡萄糖苷酶抑制活性的测定。结果表明,茶花粉粗提物经萃取后黄酮类物质主要在乙酸乙酯中富集,乙酸乙酯萃取相经大孔树脂层析后50%乙醇洗脱相中的黄酮含量最高(180.17 mg RE/g),当该样品浓度为5 mg/m L时,对α-葡萄糖苷酶的抑制率达82.67%,显著高于其它样品(p<0.05);相关性分析表明,茶花粉黄酮含量与α-葡萄糖苷酶抑制活性呈极显著正相关关系(0.867,p<0.01);酶动力学分析显示蜂花粉黄酮提取物对α-葡萄糖苷酶的半抑制浓度为1.27 mg/m L,抑制类型为可逆非竞争型抑制,抑制常数为1.17 mg/m L。该研究结果为蜂花粉黄酮及α-葡萄糖苷酶天然抑制剂的制备提供理论依据。Abstract: In order to investigate the α- glucosidase inhibitory activity of Camellia bee pollen flavonoids,10 kinds of flavonoid extracts of Camellia bee pollen prepared by different methods were chosen for flavonoids content and α- glucosidase inhibitory activity tset. The flavonoids content was increased markedly after dispose by AB- 8macroporous resins,the flavonoids content( 180.17 mg RE / g) and α- glucosidase inhibitory( 82.67%,5 mg / m L) of fractions eluted by 50% ethanol from AB-8 resin were all higher than other fractions.The results of correlation study showed that the correlation between total flavonoids content and α- glucosidase inhibitory activity in Camellia bee pollen was significantly positive( p < 0.01) and the correlation coefficient was 0.867. Enzyme dynamic analysis showed that the half- inhibitory concentration( IC50) of flavonoid extract of Camellia bee pollen on α- glucosidase was determined to be 1.27 mg / m L.The inhibition was detected to belong to noncompetitive reversible inhibition with a inhibition constant( Ki) of 1.17 mg / m L.These results provided a theoretical reference for further comprehensive utilization of flavonoids and α- glucosidase inhibitors from bee pollen.