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Colloid and Polymer Science

, Volume 281, Issue 7, pp 652–664 | Cite as

Model studies of colloidal silica precipitation using biosilica extracts from Equisetum telmateia

  • Carole C. PerryEmail author
  • Tracey Keeling-Tucker
Article

Abstract

Structural materials containing silicon are produced in single celled organisms through to higher plants and animals. Hydrated amorphous silica is a colloidal mineral of infinite functionality that is formed into structures with microscopic and macroscopic form. Proteins and proteoglycans are suggested to play a critical role in the catalysis of silica polycondensation and in structure direction during the formation of these magnificent structures. This article extends knowledge on the effect of protein containing biosilica extracts from Equisetum telmateia on the kinetics of silica formation and structure regulation. Utilising potassium silicon catecholate as the source of soluble silicon, bioextracts obtained from plant silica by dissolution of the siliceous phase with aqueous HF following extensive acid digestion of the plant cell wall were found to modify the kinetic rate constants for the formation of small silicic acid oligomers under circumneutral pH conditions and to modify the solubility of silicic acid in solution. Addition of the bioextracts at ca. 1 wt% to the reaction medium reduced the sizes and range of sizes of the fundamental silica particles formed and led to the formation of crystalline polymorphs of silica under conditions of ca. neutral pH, room temperature and in the absence of multiply charged cations, conditions assumed to be relevant to the biological mineralization environment. The ability of biological organisms to regulate the formation of silica structures with prevention of crystallinity is discussed as are the implications of this study in terms of the generation of new materials with specific form and function for industrial application.

Keywords

Silica Protein Kinetics Electron microscopy Biomineralization 

Notes

Acknowledgements

Dr Derek Walton of Derby University is thanked for tangential flow purification, Anthony Willis of the MRC Immunochemistry Unit, University of Oxford for the amino acid analyses and Professor Mark Weller of Southampton University for the extended X-ray diffraction studies. Crosfield Chemicals are thanked for financial support.

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  1. 1.Department of ChemistryThe Nottingham Trent UniversityNottinghamUK

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