Identification of potent antioxidant bioactive peptides from goat milk proteins. Goat milk proteins have gained increasing attention especially the bioactive peptides released from the parent proteins by digestive enzymes. Specifically, the interest in bioactives of goat milk is intensifying due to its reduced allergenicity compared to bovine milk.
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In this study, proteins of goat milk were fractionated into caseins (GCP) and whey proteins (GWP), hydrolyzed by pepsin and the generated peptides were examined for radical scavenging activities. The hydrolysates of whey (P- GWP) and casein (P- GCP) proteins exhibited potent superoxide anion (O2пЅҐ−) scavenging activity in a dose- dependent manner, as investigated using the natural xanthine/xanthine oxidase (X/XOD) system. The P- GWP and P- GCP dramatically quenched the O2пЅҐ− flux but had negligible effect on the catalytic function of the enzyme, indicating specificity to scavenge O2пЅҐ− but not oxidase inhibition.
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- How to isolate proteins Manju Kapoor Background Numerous authoritative books, excellent reviews and articles have been written on this subject. While general methods for isolation and purification of proteins are applicable to.
- Abstract. Goat milk proteins have gained increasing attention especially the bioactive peptides released from the parent proteins by digestive enzymes. Specifically, the interest in bioactives of goat milk is intensifying due.
Further, both P- GWP and P- GCP were able to remarkably quench the chemical DPPH radical. Fractionation of hydrolysates by size- exclusion chromatography produced four fractions (F1- F4) from both hydrolysates, with variable O2пЅҐ− scavenging activities.
However, the slow eluting fractions (F4) of both hydrolysates and fast eluting fraction (F2) of P- GCP contained peptides with the highest scavenging activities. Peptides in the active fractions of P- GWP and P- GCP, isolated by reversed phase- HPLC, exhibited significantly strong O2пЅҐ− scavenging activities. MALDI- TOF- MS allowed the identification of several antioxidant peptides derived from both caseins and whey proteins, with ОІ- casein and ОІ- lactoglobulin being the major contributors, respectively. The results demonstrate that digestion with pepsin generates multiple soluble peptides from goat milk protein fractions with remarkable ability to scavenge superoxide radicals and thus providing a fascinating opportunity for their potential candidacy as antioxidant bioactive peptides. Copyright © 2. 01.
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