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Effects of initial supersaturation on spontaneous precipitation of calcium carbonate in the presence of charged poly-L-amino acids (CROSBI ID 158012)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Njegić-Džakula, Branka ; Falini, Giuseppe ; Brečević, Ljerka ; Skoko, Željko ; Kralj, Damir Effects of initial supersaturation on spontaneous precipitation of calcium carbonate in the presence of charged poly-L-amino acids // Journal of colloid and interface science, 343 (2010), 2; 553-563. doi: 10.1016/j.jcis.2009.12.010

Podaci o odgovornosti

Njegić-Džakula, Branka ; Falini, Giuseppe ; Brečević, Ljerka ; Skoko, Željko ; Kralj, Damir

engleski

Effects of initial supersaturation on spontaneous precipitation of calcium carbonate in the presence of charged poly-L-amino acids

Spontaneous precipitation of calcium carbonate was investigated in two precipitation systems: (1) with initial supersaturation lower than that corresponding to the solubility of amorphous calcium carbonate (ACC), at which vaterite precipitated, and (2) with initial supersaturation higher than that of ACC solubility, at which a mixture of calcite and vaterite was formed. After the addition of an acidic polypeptide, poly-L-glutamic acid (pGlu) or poly-L-aspartic acid (pAsp), into (1) a significant inhibition of nucleation, expressed as an increase in induction time, and growth of vaterite, perceived as a dead zone, was observed. Extent of inhibition decreased in the order: InhpAps > InhpGlu > InhpLys. The addition of a polypeptide into (2) caused the inhibition of precipitation and changed the morphology and polymorphic composition of the precipitate ; only vaterite appeared at approximately cpAsp = 3 ppm, cpGlu = 6 ppm, or cpLys = 7 ppm. This finding is explained as a consequence of kinetic constraints through the inhibition of calcite nucleation and stronger binding of acidic polypeptide by the calcite surfaces than by the vaterite surfaces. Laboratory precipitation studies using conditions that resemble those in living organism should be run at an initial supersaturation corresponding to the solubility of ACC as a limiting condition.

calcium carbonate ; calcite ; vaterite ; amorphous calcium carbonate ; spontaneous precipitation ; acidic poly-L-amino acids

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Podaci o izdanju

343 (2)

2010.

553-563

objavljeno

0021-9797

1095-7103

10.1016/j.jcis.2009.12.010

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Kemija

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