Samples were equilibrated to room temperature
(22 ± 2 C), then the pH of each samplewas measured and,
if needed, adjusted to at most ±0.05 units from the target pH (5.5,
5.0, or 4.5) with 1.0 M HCl or 1.0 M NaOH. A whey solution was
prepared by adding 20 g of sweet whey powder to 133 g of
deionized water, stirring for 1 h at room temperature, and storing
overnight at 4 C to allow complete dispersion. The whey solution
was equilibrated to room temperature (22 ± 2 C), then added to
the pH-adjusted samples in dressing/whey ratios of 1:2, 1:4, and
1:8. Samples were placed in 50 mL plastic storage tubes, capped,
and shaken well to mix the dressing and whey. Control samples
with no added whey were also prepared for each formulation at
each pH.