Adsorption of polyamino acids and their influence on the precipitation of calcium carbonate polymorphs (CROSBI ID 497849)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija
Podaci o odgovornosti
Njegić, Branka ; Kralj, Damir ; Falini, Giuseppe ; Brečević, Ljerka
engleski
Adsorption of polyamino acids and their influence on the precipitation of calcium carbonate polymorphs
Molluscs shells, egg shells, pearls and corals are natural biocomposites in which calcium carbonate is the principal mineral component. Mechanical properties of these materials are the consequence of oriented crystallization, polymorphism and/or morphology of the calcium carbonate crystals induced by the organic matrix containing polypeptides reach in acidic amino acid residues (aspartic and glutamic acid). The aim of this work was to investigate the effect of poly-L-aspartic acid (pAsp) and poly-L-glutamic acid (pGlu) on the nucleation and crystal growth of calcium carbonate polymorphs, calcite and vaterite. Poly-L-aspartic acid and poly-L-glutamic acid were chosen as model molecules, of known composition and structure, to mimic the natural acidic polypeptides. Two types of experiments were conducted: spontaneous precipitation and precipitation initiated by introduction of seed crystals of calcite or vaterite at t=25 º ; C. The precipitation process was followed by recording pH as a function of time. Samples were characterized by means of FT-IR spectroscopy, optical and scanning electron microscopy. It was found that both synthetic polypeptides, pAsp and pGlu, inhibited nucleation as well as crystal growth of calcite and vaterite. On the contrary, basic polypeptide poly-L-lysine had no influence on the precipitation of any of the polymorphs. It could be concluded that specific adsorption of pAsp and pGlu onto the surface of the growing crystals is responsible for the inhibition effects and the assumption was confirmed by fluorescence microscopy and electrophoretic mobility measurements.
calcium carbonate; calcite; vaterite; polyamino acids; precipitation
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
Podaci o prilogu
58-x.
2004.
objavljeno
Podaci o matičnoj publikaciji
The 2004 Younger European Chemists' Conference. Highlights of European Chemical Research and R&D in 2004
Wharton, Eric
Torino: Societa Chimica Italiana
Podaci o skupu
The 2004 Younger European Chemists' Conference
poster
25.08.2004-29.08.2004
Torino, Italija