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  • Title: Hydrolysis and speciation of Al bound to pectin and plant cell wall material and its reaction with the dye chrome azurol S.
    Author: Wehr JB, Blamey FP, Hanna JV, Kopittke PM, Kerven GL, Menzies NW.
    Journal: J Agric Food Chem; 2010 May 12; 58(9):5553-60. PubMed ID: 20380374.
    Abstract:
    Hydrolysis of aluminum (Al) in solution increases at pH >or= 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 Al(3+) 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.
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