The effect of different amino acids on spontaneous precipitation of calcium carbonate polymorphs (CROSBI ID 248008)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Štajner, Lara ; Kontrec, Jasminka ; Njegić Džakula, Branka ; Maltar-Strmečki, Nadica ; Plodinec, Milivoj ; Lyons, Daniel Mark ; Kralj, Damir
engleski
The effect of different amino acids on spontaneous precipitation of calcium carbonate polymorphs
Spontaneous precipitation of CaCO3 polymorphs in the presence of selected amino acids (AA) has been investigated. The l-aspartic acid (Asp), l- lysine (Lys), l- asparagine (Asn), l- tyrosine (Tyr), l- phenylalanine (Phe), l- serine (Ser) and l-alanine (Ala) were selected because of different charge and polarity of their side chains at applied experimental conditions. The investigated AA are building units of soluble macromolecules, putatively responsible for biomineralization of molluscs’ exoskeletons. It was assumed that not only the acidic, but also the polar (hydrogen bonding) AA might contribute to macromolecules’ interactions with the mineral surfaces. The mineralogical composition, structure and morphology of precipitates formed in the presence of wide range of concentrations of AA have been determined by XRD, FT-IR and EPR spectroscopy, HPLC-MS and SEM. In the reference system, without AA addition, a mixture of typical calcite rhombohedral crystals and vaterite spherulites has been observed, while AA with negatively charged or polar side chains (Asp, Tyr, Lys, Asn, Ser) significantly changed the morphology, phase composition and crystal structure of the precipitates. The effects of nonpolar AA (Phe, Ala) on the structural and morphological properties of precipitates are less pronounced. The stronger impact observed for polar AA and particularly negatively charged Asp, may be correlated with the additional electrostatic interactions of side- chain groups with mineral surfaces.
Biomaterials ; Crystal morphology ; Growth from solutions ; Calcium carbonate ; Amino acids
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Podaci o izdanju
486
2018.
71-81
objavljeno
0022-0248
1873-5002
10.1016/j.jcrysgro.2018.01.023