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    PH-Dependent Schemes of Calcium Carbonate Formation in the Presence of Alginates

    Access Status
    Fulltext not available
    Authors
    Rao, A.
    Vásquez-Quitral, P.
    Fernández, M.
    Berg, J.
    Sánchez, M.
    Drechsler, M.
    Neira-Carrillo, A.
    Arias, J.
    Gebauer, Denis
    Cölfen, H.
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Rao, A. and Vásquez-Quitral, P. and Fernández, M. and Berg, J. and Sánchez, M. and Drechsler, M. and Neira-Carrillo, A. et al. 2016. PH-Dependent Schemes of Calcium Carbonate Formation in the Presence of Alginates. Crystal Growth & Design. 16 (3): pp. 1349-1359.
    Source Title
    Crystal Growth & Design
    DOI
    10.1021/acs.cgd.5b01488
    ISSN
    1528-7483
    School
    Department of Chemistry
    URI
    http://hdl.handle.net/20.500.11937/51923
    Collection
    • Curtin Research Publications
    Abstract

    © 2016 American Chemical Society.From recent studies on bone and shell formation, the importance of polysaccharides in biomineralization processes is gradually being recognized. Through ion-complexation and self-assembly properties, such macromolecules have remarkable effects on mineralization. However, their influences on the different regimes of crystallization including the interactions with precursor species are unclear. The present study therefore addresses calcium carbonate mineralization in the presence of alginates, a class of linear copolymeric saccharides composed of ß-1,4 linked d-mannuronic and l-guluronic acid. During mineralization, this biopolymer is found to exert pH-dependent control over mineralization pathways in terms of the stability of prenucleation clusters, inhibitory effect toward nucleation and initially formed postnucleation products. Remarkably in the presence of this macromolecular additive, either amorphous or crystalline vaterite particles can be selectively nucleated in a pH-dependent manner. This is validated by electron microscopy wherein vaterite particles are intimately associated with alginate assemblies after nucleation at pH 9.75. At lower pH, aggregates of amorphous particles are formed. Thus, in addition to the general focus on biochemical properties of additives, solution pH, a physiologically fundamental parameter significantly alters the scheme of mineralization.

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