title: Effect of ultrasound-enhanced fat separation on whey powder phospholipid composition and stability.
abstract: Fat from freshly pasteurized liquid whey was partially separated by gravity for 5, 10, and 30min, with and without simultaneous application of ultrasound. Ultrasound treatments were carried out at 400 and 1,000 kHz at different specific energy inputs (23-390 kJ/kg). The fat-enriched top layers (L1) and the fat-depleted bottom layers (L2) were separately removed and freeze-dried. Nonsonicated and sonicated L2 powders were stored for 14d at ambient temperature to assess their oxidative stability. Creaming was enhanced at both frequencies and fat separation increased with higher ultrasonic energy, extended sonication, or both. The oxidative volatile compound content decreased in defatted whey powders below published odor detection threshold values for all cases. Sonication had a minor influence on the partitioning of phospholipids with fat separation. The current study suggested that ultrasonication at high frequency enhanced fat separation from freshly pasteurized whey while improving whey powder oxidative stability.
authors.affiliation: CSIRO Food and Nutrition Flagship, Werribee, VIC 3030, Australia; Biosciences Section, Faculty of Veterinary and Agriculture Sciences, The University of Melbourne, Parkville, VIC 3010, Australia.
authors.forename: Amir E
authors.initials: AE
authors.lastname: Torkamani
authors.affiliation: CSIRO Food and Nutrition Flagship, Werribee, VIC 3030, Australia. Electronic address: Pablo.Juliano@csiro.au.
authors.forename: Pablo
authors.initials: P
authors.lastname: Juliano
authors.affiliation: CSIRO Food and Nutrition Flagship, Werribee, VIC 3030, Australia.
authors.forename: Peter
authors.initials: P
authors.lastname: Fagan
authors.affiliation: Dairy Products Technology Centre, College of Agriculture, Food & Environmental Sciences, California Polytechnic State University, San Luis Obispo 93407.
authors.forename: Rafael
authors.initials: R
authors.lastname: Jiménez-Flores
authors.affiliation: Biosciences Section, Faculty of Veterinary and Agriculture Sciences, The University of Melbourne, Parkville, VIC 3010, Australia.
authors.forename: Said
authors.initials: S
authors.lastname: Ajlouni
authors.affiliation: CSIRO Food and Nutrition Flagship, Werribee, VIC 3030, Australia.
authors.forename: Tanoj K
authors.initials: TK
authors.lastname: Singh
mesh_terms: D000818:Animals; D005511:Food Handling; D008894:Milk Proteins; D011208:Powders; D013010:Sonication; D000067796:Whey; D000067816:Whey Proteins
chemical_list: D008894:Milk Proteins; D011208:Powders; D000067816:Whey Proteins
keywords: fat separation; phospholipids; stability; ultrasound; whey