肌肽对蛋白氧化和糖化修饰的作用研究

Inhibition Effect of Carnosine on Protein Oxidation and Saccharification

肌肽是一种发现于肌肉中的二肽,具有抗氧化性。采用铁氰化钾还原法及牛血清白蛋白(BSA)氧化和糖化体系来研究肌肽的抗氧化作用。结果表明:肌肽具有还原能力;随浓度增加肌肽能够显著减少蛋白质羰基的生成(p<0.01),抑制BSA的氧化修饰;肌肽能被葡萄糖糖化修饰,随其浓度增加糖化产物的含量显著增加(p<0.01)。

Camosine is a dipeptide found in skeletal muscle and nervous tissue, reported to possess antioxidant activity. To determine its antioxidant activity, three methods were used, namely： the reduction of K3Fe（CN）6, the system of BSA oxidation induced by CuCl2-H2O2 and BSA glycation induced by glucose. The results showed that camosine possessed the reducing power; the presence of camosine significantly decreased the protein carbonyl formation in a dose-dependent manner （p 〈 0.01） and inhibited BSA oxidation. Carnosine was saccharified by glucose and the amount of saccharification end products increased （p〈 0.01） with the increasing concerntration of carosine.