A procedure was developed to coat peanuts with aqueous whey protein is
olate (WPI) solutions based on increasing coating-solution viscosity.
Oxygen uptake of WPI-coated nuts and uncoated nuts were compared. WPI
coatings delayed oxygen uptake of dry roasted peanuts at intermediate
(53%) and low (21%) storage relative humidity. They had similar result
s at 29 degrees C and 37 degrees C. The effects of coating thickness a
nd storage relative humidity indicate that the mechanism of protection
of the coatings was through their oxygen barrier properties.