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Permeability of vitamin B‐12 in chitosan membranes. Effect of crosslinking and blending with poly(vinyl alcohol) on permeability
Author(s) -
Nakatsuka Shuji,
Andrady Anthony L.
Publication year - 1992
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1992.070440103
Subject(s) - vinyl alcohol , chitosan , membrane , permeability (electromagnetism) , swelling , polymer chemistry , diffusion , chemical engineering , materials science , permeation , chemistry , polymer , organic chemistry , composite material , thermodynamics , biochemistry , physics , engineering
Abstract The permeability and diffusion of vitamin B‐12 in chitosan, crosslinked chitosans, and chitosan/poly(vinyl alcohol) (PVA) blends were studied using “lag time” technique. Apparently the diffusion coefficient, D , for both crosslinked and blended chitosan membranes depends solely upon the equilibrium swelling ratio, Q , of the material in water. The functional dependence of D on Q was obtained from the data. The partition coefficients calculated for vitamin B‐12 in all membranes studied were nearly constant ( K ≈ 0.4). The results are shown to be consistent with the “pore type” transport mechanism for vitamin B‐12 in these chitosan membranes.