Release Model of Antimicrobial Agent from Polysaccharide-based Film into Food Stimulant
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Abstract:
Low methoxyl pectin–carboxymethyl cellulose (LMP-CMC) composite films carrying potassium sorbate (LCP films) were prepared to study the release kinetics of Psb into food stimulant (50% ethanol). The release of Psb from LCP ?lms with three ratios of LMP:CMC (8:2, 6:4, and 4:6) was studied at 4?C. The release of Psb from LCP films (4:6) with different contents of calcium chloride (1%, 2%, 4%, and 8%), MMT (1%, 4%, 8%, and 12%) and Psb (2%, 5%, 8%, 15%) at 4 ℃ was also investigated. The release kinetics of Psb was described using the Fickian second law of diffusion and a simple model. The diffusion coef?cient was determined by fitting the experimental data of Psb released to models to estimate diffusivity of Psb by nonlinear least square method. The results clearly demonstrated that the release of Psb from LCP films can be tailored by changing the composition of the initial casting solution, the content of calcium chloride and MMT. The increased LMP, calcium chloride, and MMT levels resulted in a reduction of diffusion coefficients of Psb. The Fickian model satisfactorily described the experimental data, suggesting that the release kinetic of Psb can be described through the model (R2 >0.98%), and the method of calculating diffusion coef?cient from Fickian second law was reliable. The simple model can be used to describe Psb released for short contact times, to shorten the testing time; the model was satisfactory to determine the diffusion coefficients of Psb. The results indicated that the LCP film has a good potential to achieve a controlled release in antimicrobial packaging.
