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 languageEnglish
Pages (from-to)700-709
JournalFood Chemistry
Volume122
Issue number3
DOIs
Publication statusPublished - 2010

Fingerprint

calcium phosphates
Milk
Ions
ions
milk
Chemical analysis
Precipitates
Thermodynamics
X-ray diffraction
X-Ray Diffraction
thermodynamics
Solubility
calcium phosphate
solubility
Calcium
calcium
X ray diffraction
Experiments

Keywords

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

Cite this

@article{a89db19b03e24e2b9e75cb490a3b3503,
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",
publisher = "Elsevier",
number = "3",

}

Modelling ion composition in simulated milk ultrafiltrate (SMUF). I: Influence of calcium phosphate precipitation. / Gao, R.; van Halsema, F.E.D.; Temminghoff, E.J.M.; van Leeuwen, H.P.; van Valenberg, H.J.F.; Eisner, M.D.; Giesbers, M.; van Boekel, M.A.J.S.

In: Food Chemistry, Vol. 122, No. 3, 2010, p. 700-709.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

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

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DO - 10.1016/j.foodchem.2010.03.040

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SN - 0308-8146

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