Listeria monocytogenes Inhibition by Whey Protein Films and Coatings Incorporating Lysozyme
作者： Seacheol Min , Linda J Harris , Jung H Han , John M Krochta , None
DOI: 10.4315/0362-028X-68.11.2317
关键词:
摘要: The effects of whey protein isolate (WPI) films and coatings incorporating lysozyme (LZ) on the inhibition Listeria monocytogenes both in microbial media, as well cold-smoked salmon, were studied. antimicrobial LZ examined using various growth media by turbidity plate counting tests. Disc-covering disc-surface-spreading tests also used to evaluate WPI LZ. Smoked salmon was a model food test LZ, initially during storage at 4 10 degrees C for 35 days. Tensile properties (elastic modulus, tensile strength, percentage elongation), oxygen permeability, color (Hunter L, a, b) with without compared. inhibited L. broth agar media. number cells surviving after treatments depended type 204 mg per g film (dry basis) preparation 4.4 log CFU/cm2 monocytogenes. prepared 25 coating solution inactivated more than 2.4, 4.5, 3.0 CFU/g monocytogenes, total aerobes, yeasts molds smoked samples, respectively. efficiently retarded C. anti-L. effect LZ-WPI noticeable when applied before inoculation inoculation. Significantly higher elastic modulus values lower elongation permeability measured plain films.
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