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Title: Hydrolysis and dpeciation of Al bound to pectin and plant cell wall material and its reaction with the dye chrome Azurol S.
Authors: Wehr, JB
Blamey, FPC
Hanna, JV
Kopittke, PM
Kerven, GL
Menzies, NW
Keywords: Pectins
Cell Wall
Aluminium
Adsorption
Hydrolysis
Dyes
Issue Date: 12-May-2010
Publisher: American Chemical Society
Citation: Wehr, J. B., Blamey, F. P. C., Hanna, J. V., Kopittke, P. M., Kerven, G. L., & Menzies, N. W. (2010). Hydrolysis and dpeciation of Al bound to pectin and plant cell wall material and its reaction with the dye chrome Azurol S. Journal of Agricultural and Food Chemistry, 58(9), 5553-5560.
Abstract: Hydrolysis of aluminum (Al) in solution increases at pH ≥ 4 and with an Al concentration. Pectin, an important anionic polysaccharide of plant cell walls, adsorbs Al, but this phenomenon is poorly understood. This study showed that Al3+ hydrolysis results in binding of Al to pectin in excess of the stoichiometric equivalent, leading to oversaturation of the pectin with Al. However, the degree of pectin methyl-esterification did not affect the extent of Al hydrolysis. Binding of Al to purified cell wall material also resulted in Al hydrolysis in a pH- and soluble Al concentration-dependent manner, but the source of cell wall material had no effect at fixed pH. Staining of Al-treated pectin and cell wall material from wheat (Triticum aestivum L.) and sunflower (Helianthus annuus L.) with the Al-specific dye, chrome azurol S (CAS), resulted in the formation of a purple color, with the intensity related to the extent of Al hydrolysis. © 2010, American Chemical Society
URI: http://dx.doi.org/10.1021/jf100201x
http://apo.ansto.gov.au/dspace/handle/10238/1762
ISSN: 0021-8561
Appears in Collections:Journal Articles

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