富硒玉米醒酒肽的制备及活性研究
Study on preparation and activity of the selenium-enriched corn peptides facilitating alcohol metabolism
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摘要: 为了利用硒和玉米肽的双重活性,制备出活性优于普通玉米的醒酒肽,从而提高富硒玉米的附加值,以富硒玉米为原料,从中提取蛋白质,进而制备富硒玉米肽,以其对·OH抑制率、硒回收率和肽回收率等为指标,通过单因素实验以及正交实验对酶解条件进行了优化;通过动物实验比较了两种玉米肽的醒酒活性。结果显示最优酶解条件为:料液比1∶35(w/v),温度60℃,加酶量0.6%,此时硒回收率为81.78%,肽回收率为73.32%,水解度为10.50%,酶解物对·OH的半抑制率浓度(IC50)为3.57mg/mL;200mg/kg剂量的富硒玉米肽降低小鼠血清中乙醇浓度(blood alcohol concentration,BAC)的能力极显著优于同剂量的普通玉米肽(p<0.01),400mg/kg剂量的富硒玉米肽的血醇清除率可达50.99%。富硒玉米肽的醒酒活性显著优于普通玉米肽。Abstract: In order to get the higher activities selenium-enriched corn peptides with facilitating alcohol metabolism than that of corn peptides, the enzymatic hydrolysis of selenium-riched corn protein was studied.The enzymatic hydrolysis was optimized by single factor experiments and orthogonal test, the recovery of selenium/ peptides and the scavenging activity toward hydroxyl radical (·OH) as the indexes.The facilitating alcohol metabolism activity was studied by animal experiment.The optimal conditions were determined as follows:the material to solvent ratio of 1∶35 (w/v) , the temperature of 60℃, the Alcalase dosage of 0.6%.Under these conditions, selenium recovery rate was as high as 81.78%, the peptide recovery was 73.32%, the degree of hydrolysis was 10.50% and the scavenging activity toward ·OH with an IC50 value was 3.57mg/mL.The BAC was most significantly reduced in selenium-enriched corn peptides group at the dose of 200mg/kg doses when compaird to the corn peptides group with the same dose (p<0.01) .The selenium-enriched corn peptides at the dose of 400mg/kg could reduce 50.99% of BAC.The facilitating alcohol metabolism activity of seleniumenriched corn peptides was higher than corn peptides.