Štajner, Lara; Kontrec, Jasminka; Njegić Džakula, Branka; Maltar-Strmečki, Nadica; Plodinec, Milivoj; Lyons, Daniel Mark; Kralj, Damir (2018) The effect of different amino acids on spontaneous precipitation of calcium carbonate polymorphs. Journal of Crystal Growth, 486 . pp. 71-81. ISSN 0022-0248
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Abstract
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.
| Item Type: | Article | ||||||||||||
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| Additional Information: | This work was supported by the Croatian Science Foundation through project IP-2013-11-5055. | ||||||||||||
| Uncontrolled Keywords: | Biomaterials ; Crystal morphology ; Growth from solutions ; Calcium carbonate ; Amino acids | ||||||||||||
| Subjects: | NATURAL SCIENCES > Chemistry > Physical Chemistry NATURAL SCIENCES > Interdisciplinary Natural Sciences > Marine Science |
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| Divisions: | Division of Materials Chemistry | ||||||||||||
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| Depositing User: | Lara Jurković | ||||||||||||
| Date Deposited: | 21 Nov 2019 11:55 | ||||||||||||
| URI: | http://fulir.irb.hr/id/eprint/5104 | ||||||||||||
| DOI: | 10.1016/j.jcrysgro.2018.01.023 |
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