双酶法制备花生α-葡萄糖苷酶抑制肽及其体外消化稳定性研究

    Preparation and in vitro digestive stability of peanut α-glucosidase inhibitory pep-tides by dual-enzyme method

    • 摘要: 为高效开发花生蛋白资源并挖掘其酶解产物的降血糖活性,采用碱溶酸沉法提取花生蛋白,以α-葡萄糖苷酶抑制率为评价指标,通过响应面法优化双酶水解条件。结果表明:高油酸花生品种豫花37的蛋白酶解产物具有更高的α-葡萄糖苷酶抑制活性;采用碱性蛋白酶与胰蛋白酶依次对花生蛋白进行酶解,最优条件为底物浓度1.7 g/100 mL、总酶添加量4.7%(两种酶质量比1:1)、水解时间156 min(两种酶作用时间比5:1)。在此条件下,所得花生肽的α-葡萄糖苷酶抑制率达(68.41±0.45)%(肽质量浓度为2 mg/mL),水解度为(25.14±0.04)%;与前期单酶水解相比,双酶水解在不降低活性的前提下显著减少了酶用量;模拟体外胃肠消化可提高或降低不同来源蛋白肽的α-葡萄糖苷酶抑制活性,其中自制花生肽的活性在消化后显著下降。综上,优化后的双酶工艺可高效制备高活性花生α-葡萄糖苷酶抑制肽并降低酶耗,但其体外胃肠消化后的抑制活性明显降低。

       

      Abstract: To efficiently utilize peanut protein resources and investigate the hypoglycemic potential of the resulting enzymatic hydrolysates, peanut protein was extracted via alkali dissolution and acid pre-cipitation. Using the α-glucosidase inhibitory rate as the evaluation index, dual-enzyme hydrolysis conditions were optimized through response surface methodology. The results indicated that en-zymatic hydrolysates derived from Yuhua 37, a high-oleic peanut cultivar, exhibited superior α-glucosidase inhibitory activity. Sequential hydrolysis of peanut protein using alcalase followed by trypsin was carried out, and the optimal conditions were established as follows: substrate concen-tration of 1.7 g/100 mL, total enzyme dosage of 4.7% (with a 1:1 mass ratio of the two enzymes), and total hydrolysis time of 156 min (with an enzyme action time ratio of 5:1). Under these con-ditions, the α-glucosidase inhibitory rate of the resulting peanut peptides reached 68.41±0.45% at a peptide concentration of 2 mg/mL, accompanied by a degree of hydrolysis of 25.14±0.04%. Compared with single-enzyme hydrolysis in preliminary experiments, the dual-enzyme approach significantly reduced enzyme consumption while maintaining comparable inhibitory activity. Simulated in vitro gastrointestinal digestion was found to either enhance or diminish the α-glucosidase inhibitory activity of protein-derived peptides depending on their source; notably, the activity of the self-prepared peanut peptides was reduced following digestion. In conclusion, alt-hough the optimized dual-enzymatic hydrolysis process facilitates the efficient production of highly active peanut-derived α-glucosidase inhibitory peptides with lower enzyme usage, the resulting inhibitory activity is substantially diminished after in vitro simulated gastrointestinal digestion.

       

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