title: Bioactive peptides released by in vitro digestion of standard and hydrolyzed infant formulas.
abstract: Hydrolyzed infant formulas serve as appropriate nutritional sources for infants afflicted with cow's milk allergy, and milk proteins in hydrolyzed formulas are industrially hydrolyzed extensively or partially. To investigate whether industrial hydrolysis may modulate the digestive trajectory of milk proteins, thereby releasing different profiles of bioactive peptides compared with standard formulas, both standard and hydrolyzed formulas were subjected to in vitro digestion and formation of bioactive peptides were compared. One standard, one extensively hydrolyzed, and one partially hydrolyzed infant formula were digested in vitro with pepsin and pancreatin, taking into account the higher gastric pH of infants, and the digesta were subjected to peptidomic analysis. The standard formula released a larger variety of bioactive peptides than from the hydrolyzed formulas, indicating that industrial hydrolysis of milk proteins may generally attenuate their indigenous bioactivities such as antibacterial, immuno-regulatory, and anti-oxidative activities. Conversely, industrial hydrolysis may facilitate the formation of bioactive peptides from hydrophobic proteins/regions such as β-LG and the "strategic zone" of β-CN, which encrypt bioactive peptides including a dipeptidyl dipeptidase-4-inhibitory, hypocholesterolemic, and opioid peptides. Infants fed hydrolyzed infant formulas may be influenced by milk protein-derived bioactive peptides in a manner different from those fed standard formula.
authors.affiliation: Department of Nutrition, University of California, Davis, One Shields Ave., Davis, CA 95616, USA; Nutritional Science Institute, Morinaga Milk Industry Co., Ltd., 5-1-83, Higashihara, Zama, Kanagawa Pref. 252-8583, Japan.
authors.forename: Yasuaki
authors.initials: Y
authors.lastname: Wada
authors.affiliation: Department of Nutrition, University of California, Davis, One Shields Ave., Davis, CA 95616, USA. Electronic address: bllonnerdal@ucdavis.edu.
authors.forename: Bo
authors.initials: B
authors.lastname: Lönnerdal
mesh_terms: D004063:Digestion; D006801:Humans; D041943:Infant Formula / Q000737:chemistry*; D007231:Infant, Newborn; D010455:Peptides / Q000032:analysis / Q000737:chemistry*; D011492:Protein Hydrolysates / Q000737:chemistry*
chemical_list: D010455:Peptides; D011492:Protein Hydrolysates
keywords: Bioactive peptide; In vitro digestion; Infant formula; Milk protein; Peptidomic technique