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Studies on Physicochemical and Functional Properties of Commercial Sweet Whey Powders

Department of Food Science, University of Wisconsin, Madison 53706

Corresponding author: S. A. Rankin; e-mail: sarankin{at}wisc.edu.

The objective of this study was to characterize variation and interrelatedness among primary functional and compositional parameters of commercially available sweet whey powders. Samples representing different plants/processes and cheese types were assayed for foaming capacity, foam stability, pH, protein content, soluble protein, turbidity, color, particle size distribution, lipid, and moisture. Data were analyzed using principal component analysis. Foaming capacity and stability varied from 10 to 220% and 0.1 to 14 min, respectively. Protein content and solubility ranged from 8.5 to 17.6% and 3.7 to 14.1%, respectively. Lipid content of sweet whey powder varied from 0.03 to 2.00%. The two main functional properties, foaming and protein solubility, did not show significant correlation with each other. Foaming properties showed a positive correlation to particle size and L* or lightness value, and negative correlation to lipid content. Protein solubility showed positive correlation with protein content and negative correlation with turbidity of the sample. Foaming behavior, protein, and particle size attributes were the main variables responsible for grouping of samples. Sweet whey powders from the same dairy plants were grouped together. The direct or indirect significance of these relationships to processing is detailed in this study.

Key Words: sweet whey powder • physicochemical • functional properties

Abbreviation key: D(0.5) = mean size of 50th-percentile particles in a given sample, DE* = total color difference from standard white, D(m) = volume weighted mean size, F = lipid content, FC = foaming capacity, FS = foam stability, M = moisture, PC = protein content, PCA = principal component analysis, PS = particle size distribution, SWP = sweet whey powder, SPC = soluble protein content, T = turbidity, WPC = whey protein concentrate, WPI = whey protein isolate

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