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Release of potassium sorbate from active films of sodium alginate crosslinked with calcium chloride
Author(s) -
Zactiti E. M.,
Kieckbusch T. G.
Publication year - 2009
Publication title -
packaging technology and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.365
H-Index - 50
eISSN - 1099-1522
pISSN - 0894-3214
DOI - 10.1002/pts.860
Subject(s) - potassium sorbate , thermal diffusivity , sodium alginate , diffusion , swelling , calcium alginate , potassium , chemistry , fick's laws of diffusion , chemical engineering , calcium , sodium , materials science , thermodynamics , organic chemistry , composite material , raw material , physics , engineering
The release of potassium sorbate from alginate films was evaluated considering different active agent concentrations in the film and three levels of alginate crosslinking. The mechanism involved in the diffusional process was investigated using the Power Law Model. The results indicated that potassium sorbate diffusion in alginate films has characteristics of Fickian and non‐Fickian behaviour. Effective diffusion coefficients obtained using the solution in series derived from Fick's Second Law are close to values obtained by the short‐time solution, indicating that the influence of swelling on effective diffusivity, although perceptible, is small, allowing the use of an average effective diffusivity. The values of effective diffusivity found indicate that alginate films have a potential use as systems for release of active substances. Copyright © 2009 John Wiley & Sons, Ltd.