Thermoase‐hydrolysed pigeon pea protein and its membrane fractions possess in vitro bioactive properties (antioxidative, antihypertensive, and antidiabetic). Issue 3 (10th August 2020)

• Record Type: Journal Article
• Authors: Olagunju, Aderonke I.; Omoba, Olufunmilayo S.; Enujiugha, Victor N.; Alashi, Adeola M.; Aluko, Rotimi E.
• Is Part Of: Journal of food biochemistry. Volume 45:Issue 3(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-08-10
• Subjects: angiotensin converting enzyme -- antioxidant -- membrane ultrafiltration -- pigeon pea -- thermoase -- α‐amylase -- α‐glucosidase; Food -- Analysis -- Periodicals; Food -- Composition -- Periodicals; Biochemistry -- Periodicals; 664.024
• DOI: 10.1111/jfbc.13429
• Languages: English
• ISSNs: 0145-8884

Abstract

Abstract: Enzymatic hydrolysis can liberate bioactive peptides from protein materials, thus, pigeon pea was hydrolysed using thermoase. Crude hydrolysate (PPHT) was subjected to ultrafiltration using different molecular weight cutoffs to collect <1, 1–3, 3–5, 5–10, and >10 kDa peptide fractions. Fractions were analysed for in vitro antioxidative, antihypertensive, and antidiabetic properties. The peptide fractions had stronger DPPH scavenging and renin inhibition when compared to PPHT. In contrast, ACE inhibition was stronger for the PPHT and <1 kDa peptide fraction while activity decreased as peptide size increased. The <1 kDa peptide also showed significantly stronger ferric reducing antioxidant power, OH scavenging and inhibition of linoleic acid oxidation when compared to PPHT. α‐amylase and α‐glucosidase were inhibited by all the peptide fractions, though the 3–5 and >10 kDa had higher values. We conclude that the PPHT and peptide fractions could serve as potential ingredients to formulate antihypertensive and antidiabetic functional foods and nutraceuticals. Practical applications: Oxidative stress promotes the generation of free radicals, which have a significant impact in the pathogenesis of human chronic diseases such as cardiovascular impairment, cancer, and diabetes. Peptides generated from enzymatic hydrolysis of proteins have been identified to impart beneficial health effects. In this work, we showed that a thermoase digest of pigeon pea protein as well as the fractionated peptides had strong antioxidant properties in addition to exhibiting inhibitory activities against renin and angiotensin converting enzyme, the main therapeutic targets for antihypertensive agents. The peptide products also inhibited α‐amylase and α‐glucosidase activities, providing potential ingredients that can be used to formulate antidiabetic functional foods. Abstract : Thermoase‐hydrolysed pigeon pea ultrafiltered peptides possess potent radical scavenging ability and ferric reducing property. Angiotensin converting enzyme inhibition was stronger for crude hydrolysate and <1 kDa while renin inhibition was greater in 1–3, 3–5 and >10 kDa peptides. Intermediate and high molecular weight peptides showed higher ability to inhibit α‐amylase and α‐glucosidase enzymes.