Modelling ion composition in simulated milk ultrafiltrate (SMUF). I: Influence of calcium phosphate precipitation
| Autor: | M. Giesbers, R. Gao, H.J.F. van Valenberg, M.A.J.S. van Boekel, F.E.D. van Halsema, M.D. Eisner, H.P. van Leeuwen, Erwin J. M. Temminghoff |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
Bodemscheikunde en Chemische Bodemkwaliteit
ph Laboratorium voor Fysische chemie en Kolloïdkunde chemistry.chemical_element Calcium 50-degrees-c Analytical Chemistry Ion donnan membrane technique Chemical composition Physical Chemistry and Colloid Science VLAG Supersaturation Chromatography WIMEK Chemistry Precipitation (chemistry) Organic Chemistry Leerstoelgroep Productontwerpen en kwaliteitskunde General Medicine Solubility equilibrium Product Design and Quality Management Group equilibria Organische Chemie Ultrafiltration (renal) speciation Composition (visual arts) additives salt solution Soil Chemistry and Chemical Soil Quality Food Science |
| Zdroj: | Food Chemistry, 122(3), 700-709 Food Chemistry 122 (2010) 3 |
| ISSN: | 0308-8146 |
| DOI: | 10.1016/j.foodchem.2010.03.040 |
| Popis: | Freshly prepared simulated milk ultrafiltrate (SMUF) is a solution that is supersaturated with respect to various calcium phosphate phases that precipitate in time. As a consequence, the ion composition of equilibrated SMUF was found to be significantly different from that of freshly prepared SMUF. This study proposes a thermodynamic ion-speciation model that is able to describe ion equilibria in SMUF. Moreover, it is also able to describe calcium phosphate precipitation in fresh SMUF on its way to equilibrium by using an apparent solubility product for CaHPO 4 ·2H 2 O as a function of time. The model was validated by experiments in which CaCl 2 and Na 2 HPO 4 were added to freshly prepared SMUF. The changes in calcium activity and pH were followed and the precipitates were characterised by X-ray diffraction. The model was able to predict the observed changes. |
| Databáze: | OpenAIRE |
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