Determination of the cation content of alginate thin films by FTi.r. spectroscopy

Determination of the cation content of alginate thin films by FTi.r. spectroscopy

Different sodium alginates derived from Laminaria hyperborea, with various mannuronate/guluronate (M/G) ratios and molecular weights, were immersed in calcium chloride solution and converted to mixed sodium/calcium salts. Thin films were obtained and studied using Fourier transform infrared spectros...

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Bibliographic Details
Published in:Polymer (Guilford) Vol. 38; no. 1; pp. 43 - 51
Main Authors: Sartori, Céline, Finch, Dudley S., Ralph, Brian, Gilding, Keith
Format: Journal Article
Language:English
Published: Oxford Elsevier Ltd 1997
Elsevier
Subjects:
alginate
Applied sciences
Exact sciences and technology
i.r. spectroscopy
ion content
Natural polymers
Physicochemistry of polymers
Starch and polysaccharides
alginate
ion content
i.r. spectroscopy
Polyelectrolyte
Infrared spectrometry
Potassium Sodium Compounds
Fourier transformation
Calcium ion
Analysis method
Sodium ion
Oside polymer
Alginates
Experimental study
Quantitative analysis
Thin film
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Summary:Different sodium alginates derived from Laminaria hyperborea, with various mannuronate/guluronate (M/G) ratios and molecular weights, were immersed in calcium chloride solution and converted to mixed sodium/calcium salts. Thin films were obtained and studied using Fourier transform infrared spectroscopy ( FTi.r.). FTi.r. spectra were recorded as a function of time and the ion exchange between sodium and calcium monitored. Peak shifts, difference in peak shapes and the appearance of new peaks were observed, and some explanations of the phenomena observed are proposed. In parallel, the samples were analysed quantitatively by atomic absorption/emission spectroscopy. From these results, peak wavenumbers derived from the FTi.r. spectra could be correlated quantitatively to the sodium and calcium content.
ISSN:0032-3861
1873-2291
DOI:10.1016/S0032-3861(96)00458-2