The precipitation temperatures of sodium caseinate in H2O and D2O in the presence of Mg2+, Ca2+, Sr 2+ and Ba2+ were investigated through fluorescence, turbidity and conductivity experiments. As for the ability of the divalent cations (1-17.5 mM) to induce the precipitation process in H2O, the sequence Ba2+ ≥ Ca2+ > Mg2+ > Sr 2+ was found. Remarkably, while at low salt concentrations (<10 mM) precipitation temperatures (TPs) were found to change significantly depending on the specific cation, at higher concentrations (>10 mM) the differences among the different cations were greatly reduced. By fitting these results with a modified Jones-Dole equation, we confirmed that the less hydrated ions possess a greater capacity to induce precipitation. In D2O, the order of ion ability to induce caseinate precipitation was Ba2+ > Ca2+ > Sr2+ > Mg2+. The different hydrophobicity between D2O and H2O was shown to affect significantly the TPs of caseinate in the presence of calcium, strontium and barium.

Effects of solvent and alkaline earth metals on the heat-induced precipitation process of sodium caseinate

LOPEZ, Francesco;CUOMO, Francesca;CEGLIE, Andrea
2013-01-01

Abstract

The precipitation temperatures of sodium caseinate in H2O and D2O in the presence of Mg2+, Ca2+, Sr 2+ and Ba2+ were investigated through fluorescence, turbidity and conductivity experiments. As for the ability of the divalent cations (1-17.5 mM) to induce the precipitation process in H2O, the sequence Ba2+ ≥ Ca2+ > Mg2+ > Sr 2+ was found. Remarkably, while at low salt concentrations (<10 mM) precipitation temperatures (TPs) were found to change significantly depending on the specific cation, at higher concentrations (>10 mM) the differences among the different cations were greatly reduced. By fitting these results with a modified Jones-Dole equation, we confirmed that the less hydrated ions possess a greater capacity to induce precipitation. In D2O, the order of ion ability to induce caseinate precipitation was Ba2+ > Ca2+ > Sr2+ > Mg2+. The different hydrophobicity between D2O and H2O was shown to affect significantly the TPs of caseinate in the presence of calcium, strontium and barium.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11695/48250
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