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Updated: Jul 2, 2025

Determination of the Gas-phase Acidities of Oligopeptides
Published on: June 24, 2013
Influence of acidification and re-neutralization on mineral equilibria and physicochemical properties of model cheese
Ipek Altay1, Naaman Francisco Nogueira Silva2, Jens J Sloth3
1Research Group for Food Production Engineering, National Food Institute, Technical University of Denmark, Søltofts Plads 227, 2800 Kongens Lyngby, Denmark.
Abstract:
Cheese feed is used as spray-dryer feed in cheese powder production, where there is growing consumer demand to eliminate calcium-chelating salts (ES). To develop ES-free feed production processes, it is essential to investigate the relationship between pH, structural changes, and mineral solubilization. This study investigated the influence of acidification and pH re-neutralization on calcium equilibria and stability of ES-free model cheese feeds. The goal was to increase protein availability by solubilizing colloidal calcium phosphate (CCP) and to assess whether CCP solubilization is reversible upon re-neutralization. The extent of acidification (to pH 4.2 or pH 4.7) significantly affected the irreversibility of calcium solubilization upon re-neutralization. Moreover, re-neutralization treatment seemed to induce changes in protein-fat interactions. Feed viscosity was mainly influenced by the final pH, rather than the re-neutralization history. These results offer new insights into the complex interplay of pH, structural modifications, mineral solubilization, and stability in cheese feed production.
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