Metal complexation of chitosan and its glutaraldehyde cross-linked derivative

The physicochemical characterization of metal complexed with chitosan (CS) and its glutaraldehyde cross-linked derivative (CSGA) was investigated. Seven metal ions from chromium through zinc of the first row of the transition metals were selected for complexation. Structural features pertinent to wh...

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Bibliographic Details
Published in:Carbohydrate research 2007-07, Vol.342 (9), p.1189-1201
Main Authors: Webster, Athena, Halling, Merrill D., Grant, David M.
Format: Article
Language:English
Subjects:
Amine
Chitosan
Chitosan - chemistry
Cross-Linking Reagents - chemistry
Electron Spin Resonance Spectroscopy
Glutaral - chemistry
Glutaraldehyde cross-linked chitosan
Imine
Magnetic Resonance Spectroscopy
Metal interaction
Metals - chemistry
Metal–polymer complexes
Models, Molecular
Molecular Structure
Schiff base
Spectrophotometry, Atomic
Spectroscopy, Fourier Transform Infrared
X-Ray Diffraction
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Summary:The physicochemical characterization of metal complexed with chitosan (CS) and its glutaraldehyde cross-linked derivative (CSGA) was investigated. Seven metal ions from chromium through zinc of the first row of the transition metals were selected for complexation. Structural features pertinent to where and how metals bind into both polymers are our main interest. Studies using solid-state NMR spectroscopy and XRPD (X-ray powder diffraction) supported by ESR spectroscopy, ICP-OES (inductively couple plasma-optical emission spectroscopy) and far-FTIR spectroscopy for metal interaction with nitrogen sites at C-2 of the metal–polymer complexes were performed. Theoretical calculations of the metal–polymer ratio, the approximate charges on nitrogen for both amine and imino-linker, and the proton affinity between an alcohol group from the polymer and an amino/imino group are reported. A helical coiled chitosan model and a 2C1L (two-chitosans with one linker) model are proposed here. The metal uptake mechanism for both polymers is concluded to be absorption within the polymers, rather than adsorption on the polymer surface.
ISSN:0008-6215
1873-426X
DOI:10.1016/j.carres.2007.03.008