Modelling ion composition in simulated milk ultrafiltrate (SMUF). I: Influence of calcium phosphate precipitation.

R. Gao; F.E.D. van Halsema; E.J.M. Temminghoff; H.P. van Leeuwen; H.J.F. van Valenberg; M.D. Eisner; M. Giesbers; M.A.J.S. van Boekel

doi:10.1016/j.foodchem.2010.03.040

Modelling ion composition in simulated milk ultrafiltrate (SMUF). I: Influence of calcium phosphate precipitation.

R. Gao, F.E.D. van Halsema, E.J.M. Temminghoff, H.P. van Leeuwen, H.J.F. van Valenberg, M.D. Eisner, M. Giesbers, M.A.J.S. van Boekel

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Abstract

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 CaHPO4·2H2O as a function of time. The model was validated by experiments in which CaCl2 and Na2HPO4 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

Original language	English
Pages (from-to)	700-709
Journal	Food Chemistry
Volume	122
Issue number	3
DOIs	https://doi.org/10.1016/j.foodchem.2010.03.040
Publication status	Published - 2010

Keywords

donnan membrane technique
salt solution
ph
50-degrees-c
equilibria
speciation
additives

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10.1016/j.foodchem.2010.03.040

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title = "Modelling ion composition in simulated milk ultrafiltrate (SMUF). I: Influence of calcium phosphate precipitation.",

abstract = "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 CaHPO4·2H2O as a function of time. The model was validated by experiments in which CaCl2 and Na2HPO4 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",

keywords = "donnan membrane technique, salt solution, ph, 50-degrees-c, equilibria, speciation, additives",

author = "R. Gao and {van Halsema}, F.E.D. and E.J.M. Temminghoff and {van Leeuwen}, H.P. and {van Valenberg}, H.J.F. and M.D. Eisner and M. Giesbers and {van Boekel}, M.A.J.S.",

year = "2010",

doi = "10.1016/j.foodchem.2010.03.040",

language = "English",

volume = "122",

pages = "700--709",

journal = "Food Chemistry",

issn = "0308-8146",

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T1 - Modelling ion composition in simulated milk ultrafiltrate (SMUF). I: Influence of calcium phosphate precipitation.

AU - Gao, R.

AU - van Halsema, F.E.D.

AU - Temminghoff, E.J.M.

AU - van Leeuwen, H.P.

AU - van Valenberg, H.J.F.

AU - Eisner, M.D.

AU - Giesbers, M.

AU - van Boekel, M.A.J.S.

PY - 2010

Y1 - 2010

N2 - 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 CaHPO4·2H2O as a function of time. The model was validated by experiments in which CaCl2 and Na2HPO4 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

AB - 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 CaHPO4·2H2O as a function of time. The model was validated by experiments in which CaCl2 and Na2HPO4 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

KW - donnan membrane technique

KW - salt solution

KW - ph

KW - 50-degrees-c

KW - equilibria

KW - speciation

KW - additives

U2 - 10.1016/j.foodchem.2010.03.040

DO - 10.1016/j.foodchem.2010.03.040

M3 - Article

SN - 0308-8146

VL - 122

SP - 700

EP - 709

JO - Food Chemistry

JF - Food Chemistry

IS - 3

ER -

Modelling ion composition in simulated milk ultrafiltrate (SMUF). I: Influence of calcium phosphate precipitation.

Abstract

Keywords

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