Pregled bibliografske jedinice broj: 157164
Precipitation of Calcium Carbonate Polymorphs by Enzyme-Catalyzed Reactions
Precipitation of Calcium Carbonate Polymorphs by Enzyme-Catalyzed Reactions // 17th Conference of the European Colloid and Interface Society(Abstract-Book) / Baglioni, Piero et al. (ur.).
Firenza : München, 2003. str. 508-508 (poster, nije recenziran, sažetak, ostalo)
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Naslov
Precipitation of Calcium Carbonate Polymorphs by Enzyme-Catalyzed Reactions
Autori
Sondi, Ivan ; Salopek-Sondi, Branka
Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, ostalo
Izvornik
17th Conference of the European Colloid and Interface Society(Abstract-Book)
/ Baglioni, Piero et al. - Firenza : München, 2003, 508-508
Skup
17th Conference of the European Colloid and Interface Society
Mjesto i datum
Firenca, Italija, 21.10.2003. - 26.10.2003
Vrsta sudjelovanja
Poster
Vrsta recenzije
Nije recenziran
Ključne riječi
Biomineralization; Calcium Carbonate Polymorphs; Precipitation
Sažetak
The present study deals with the influence of two different types of urease: plant and bacterial enzymes fractionated from Canavlia ensiformis and Bacillus pasteurii, respectively, on the precipitation of calcium carbonate polymorphs in solutions of calcium salts and urea at room temperature. Our previous investigations have shown that calcium carbonate polymorphs and strontium and barium carbonates can be precipitated by the activity of enzyme urease, added to solution containing calcium, barium, and strontium salts, and urea at room temperature [1-3]. In this study it has been shown that the formation of different polymorphs and morphologies of calcium carbonate precipitates was affected by the type and concentration of enzymes. Despite similarity in their amino acid sequences and in catalytic decomposition of urea, these enzymes caused precipitation of different calcium carbonate polymorphs. Thus, under the same experimental conditions, the presence of Bacillus pasteurii enzyme in reacting solutions governs precipitation of vaterite, while calcite was formed in the presence of Canavlia ensiformis urease. In addition, these enzymes exert different influence on development of calcite faces, and significantly modify the morphology of obtained particles. These results offer insight into the role of enzyme macromolecules in the precipitation of calcium carbonate polymorphs in some biogeochemical processes in natural environments.
Izvorni jezik
Engleski
Znanstvena područja
Kemija
