Egg white and whey protein isolate
Commercial samples of whey protein isolate
(WPI) (BiPro, Davisco Foods International, Inc,
LeSueur MN) and spray dried egg white protein
(EWP) (P-18-J, Henningsen Foods, White Plains,
NY) were obtained and stored at room temperature
until used. Protein content of WPI and
EWP samples was determined by the Macro–
Kjeldahl method [13] using N factors of 6.38
and 6.25, respectively. Extra fine granulated
sugar (Dixie Crystals) was purchased from a local
grocery store and stored at room temperature.
Sodium fluorescein was purchased from
Sigma Chemical Co (St. Louis, MO).