title: Surface hydrophobicity of physicochemically and enzymatically treated milk proteins in relation to techno-functional properties.
abstract: Surface hydrophobicity (SH) of milk proteins treated physicochemically (by heating and Maillard reaction) or modified enzymatically (by transglutaminase, lactoperoxidase, laccase, and glucose oxidase) was assessed in relation to their techno-functional properties. Heat-treatment increased SH of whey protein isolate and decreased SH of sodium caseinate and bovine serum albumin. Maillard reaction of milk proteins caused time-depended decreases of SH. Only for total milk protein reacting with glucose and lactose elevated SH-values were detected. Protein modification with transglutaminase, laccase, and lactoperoxidase strongly increased the SH of whey protein isolate and total milk protein. Incubation with glucose oxidase elevated SH values of sodium caseinate, whey protein isolate, and total milk protein. When correlating SH with techno-functional properties, a positive correlation was observed between SH and foam formation, and a negative correlation was observed between SH and foam stability as well as emulsion stability. No clear correlation was detected between SH and emulsifying activity, surface tension, viscosity, and heat stability of enzymatically and physicochemically treated milk proteins.
authors.affiliation: Institute of Dairy Chemistry and Technology, Federal Research Centre for Nutrition and Food, Location Kiel, Hermann-Weigmann-Strasse 1, D-24103 Kiel, Germany.
authors.forename: Beate
authors.initials: B
authors.lastname: Hiller
authors.forename: Peter Chr
authors.initials: PC
authors.lastname: Lorenzen
mesh_terms: D055598:Chemical Phenomena; D002627:Chemistry, Physical; D005524:Food Technology; D005949:Glucose Oxidase / Q000378:metabolism; D006358:Hot Temperature; D057927:Hydrophobic and Hydrophilic Interactions; D042845:Laccase / Q000378:metabolism; D007784:Lactoperoxidase / Q000378:metabolism; D015416:Maillard Reaction; D008894:Milk Proteins / Q000737:chemistry* / Q000378:metabolism; D011503:Transglutaminases / Q000378:metabolism
chemical_list: D008894:Milk Proteins; D005949:Glucose Oxidase; D042845:Laccase; D007784:Lactoperoxidase; D011503:Transglutaminases