Whey protein film composition effects on potassium sorbate and natamycin diffusion
2004
Franssen, L.R. | Rumsey, T.R. | Krochta, J.M.
To assess the ability of whey protein films to act as antimicrobial carriers, the effect of film composition on preservative diffusion was investigated. Preservative diffusion coefficients were measured at 24 degrees C in whey protein isolate (WPI) films with different WPI-glycerol plasticizer ratios (1:1 to 15:1), beeswax (BW) content, 0% to 40% w/w dry solids, and preservative addition of 0.3% (w/w) natamycin or 1.6% (w/w dry solids) potassium sorbate. Diffusion coefficients for potassium sorbate and natamycin were in the ranges 1.09 x 10(-11) to 13.0 x 10(-11) m2/s and 6.16 x 10(-14) to 37.8 x 10(-14) m2/s, respectively, and significantly decreased as the WPI-glycerol ratio increased. No significant difference in sorbate diffusion was seen with the addition of BW.
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