title: Comparison of in vitro digestion characteristics and antioxidant activity of hot- and cold-pressed peanut meals.
abstract: Due to the poor protein solubility, hot-pressed peanut meal (HPM) has less value than cold-pressed peanut meal (CPM) in the food industry. The objective of this study was to determine whether the denatured proteins in HPM were suitable for hydrolysis by digestive enzymes. The hydrolysis characteristics and antioxidant activity of HPM and CPM during in vitro digestion were compared. The results showed that HPM was hydrolysed more extensively than CPM. There were more free amino acids and small peptides with MW<5 kDa in HPM hydrolysates. In addition, HPM hydrolysates displayed stronger 1,1-diphenyl-2-picrylhydrazyl (DPPH) and 2,20-azinobis (3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) radical-scavenging activities, ORAC value and reducing power than CPM hydrolysates, which could be due to the higher content of small peptides, antioxidative amino acids and melanoidins in HPM hydrolysates. The above results indicated that HPM was a potential source of protein supplement for human consumption.
authors.affiliation: College of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510640, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Zheng
authors.forename: Jiaoyan
authors.initials: J
authors.lastname: Ren
authors.forename: Guowan
authors.initials: G
authors.lastname: Su
authors.forename: Bao
authors.initials: B
authors.lastname: Yang
authors.forename: Mouming
authors.initials: M
authors.lastname: Zhao
mesh_terms: D000596:Amino Acids / Q000032:analysis; D000975:Antioxidants / Q000032:analysis / Q000378:metabolism*; D010367:Arachis / Q000737:chemistry / Q000378:metabolism*; D003080:Cold Temperature; D004063:Digestion; D005511:Food Handling / Q000379:methods*; D006358:Hot Temperature; D006801:Humans; D006868:Hydrolysis; D008954:Models, Biological; D010455:Peptides; D011492:Protein Hydrolysates / Q000737:chemistry / Q000378:metabolism
chemical_list: D000596:Amino Acids; D000975:Antioxidants; D010455:Peptides; D011492:Protein Hydrolysates
keywords: Amino acid composition; Antioxidant activity; In vitro digestion; Molecular weight; Peanut meal