title: Evaluation of the Physicochemical Parameters of Functional Whey Beverages.
abstract: The objective of this study is to determine the impact of the key technological parameters on the quality indices of functional beverages produced from whey and enriched with 0.2% of cold-pressed flaxseed oil, rich in ω-3 fatty acids. The amount of fatty acids, peroxide and anisidine values, fatty acidity, sedimentation and sensory parameters of whey beverages were estimated. It was found that the addition of flaxseed oil affected the sensory, physical and chemical properties of the beverages. High quantities of oleic and α-linolenic fatty acids (18.97 and 54.82%, respectively) and negligible amounts of palmitic and myristic acids (4.79 and 0.04%, respectively) were found in the product. On the basis of the obtained results, the beverages from whey enriched with flaxseed oil had a favourable ratio of n-6/n-3 polyunsaturated fatty acids and atherogenic and thrombogenic indices. The addition of a stabiliser and the pasteurisation of whey beverages with flaxseed oil did not affect the sensory parameters and the acidity of the products. The highest peroxide value (2.36 meq O2/kg) and acidity (0.34%) were found in the samples with pH=4.0 after 30-day storage at (6±1) °С. A strong negative correlation was estimated between the amount of polyunsaturated fatty acids and anisidine value (R=-0.871; p<0.05), peroxide value (R=-0.728; p<0.05) and fatty acidity (R=-0.948; p<0.05).
authors.affiliation: Lithuanian University of Health Sciences, Department of Food Safety and Quality, Tilzes Str. 18, LT-47181 Kaunas, Lithuania.
authors.forename: Aistė
authors.initials: A
authors.lastname: Kabašinskienė
authors.affiliation: Kaunas University of Technology, Food Institute, Taikos Av. 92, LT-51180 Kaunas, Lithuania.
authors.forename: Algirdas
authors.initials: A
authors.lastname: Liutkevičius
authors.affiliation: Lithuanian University of Health Sciences, Department of Food Safety and Quality, Tilzes Str. 18, LT-47181 Kaunas, Lithuania.
authors.forename: Dalia
authors.initials: D
authors.lastname: Sekmokienė
authors.affiliation: Lithuanian University of Health Sciences, Department of Food Safety and Quality, Tilzes Str. 18, LT-47181 Kaunas, Lithuania; Kaunas University of Technology, Food Institute, Taikos Av. 92, LT-51180 Kaunas, Lithuania.
authors.forename: Gintarė
authors.initials: G
authors.lastname: Zaborskienė
authors.affiliation: Lithuanian University of Health Sciences, Department of Food Safety and Quality, Tilzes Str. 18, LT-47181 Kaunas, Lithuania.
authors.forename: Jūratė
authors.initials: J
authors.lastname: Šlapkauskaitė
keywords: beverages; flaxseed oil; oxidation; whey; ω-3 fatty acids