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Preparation of bioactive peptides with antidiabetic, antihypertensive, and antioxidant activities and identification of α‐glucosidase inhibitory peptides from soy protein

机译:制备具有抗糖尿病,抗高血压和抗氧化活性的生物活性肽,并从大豆蛋白中鉴定α-葡萄糖苷酶抑制肽

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In this study, the peptides of soy protein obtained by enzymatic digestion with proteases were analyzed for their antidiabetic, antihypertensive, and antioxidant activities. Peptides prepared with alkaline proteinase (AP) exhibited the highest α‐glucosidase inhibitory activity compared with those from papain and trypsin digestion. AP hydrolysates also exhibited dipeptidyl peptidase IV (DPP‐IV) inhibitory, angiotensin‐converting enzyme (ACE) inhibitory, and antioxidant activities. Gastrointestinal digestion of peptides enhanced α‐glucosidase, DPP‐IV, and ACE inhibitory activities compared with AP hydrolysates. AP peptides showing highest α‐glucosidase inhibitory activity were purified by anion‐exchange and size‐exclusion chromatography, and identified using tandem MS. We found three novel α‐glucosidase inhibitory peptides with sequences LLPLPVLK, SWLRL, and WLRL with IC 50 of 237.43?±?0.52, 182.05?±?0.74, and 162.29?±?0.74?μmol/L, respectively. Therefore, peptides hydrolyzed from soy protein are promising natural ingredients for nutraceutical applications assisting in the management of diabetes.
机译:在这项研究中,分析了用蛋白酶进行酶消化获得的大豆蛋白肽的抗糖尿病,抗高血压和抗氧化活性。与木瓜蛋白酶和胰蛋白酶消化的肽相比,用碱性蛋白酶(AP)制备的肽表现出最高的α-葡萄糖苷酶抑制活性。 AP水解产物还具有二肽基肽酶IV(DPP-IV)抑制,血管紧张素转换酶(ACE)抑制和抗氧化活性。与AP水解产物相比,肽的胃肠道消化增强了α-葡萄糖苷酶,DPP-IV和ACE的抑制活性。通过阴离子交换和尺寸排阻色谱法纯化具有最高α-葡萄糖苷酶抑制活性的AP肽,并使用串联MS进行鉴定。我们发现了三种新颖的α-葡萄糖苷酶抑制肽,其序列LLPLPVLK,SWLRL和WLRL的IC 50分别为237.43±0.52、182.05±0.74和162.29±0.74μmol/ L。因此,从大豆蛋白水解的肽是有希望的天然成分,可用于营养保健领域,有助于糖尿病的治疗。

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