Solubility of carbon dioxide in renneted casein matrices: effect of pH, salt, temperature, partial pressure, and moisture to protein ratio
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Accepted Version
Date
2020-07-25
Authors
Lamichhane, Prabin
Sharma, Prateek
Kelly, Alan L.
Risbo, Jens
Rattray, Fergal P.
Sheehan, Jeremiah J.
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Published Version
Abstract
The solubility of carbon dioxide (CO2) in the moisture and protein components of cheese matrices and the influence of changing pH, salt and temperature levels remains unclear. In this study, model casein matrices were prepared, by renneting of micellar casein concentrate (MCC), with modulation of salt and pH levels by adding salt and glucono delta-lactone, respectively, to the MCC solutions prior to renneting. Different moisture-to-protein levels were achieved by freeze-drying, incubation of samples at different relative humidities, or by applying varying pressures during gel manufacture. The CO2 solubility of samples decreased linearly with both increasing temperature and salt-in-moisture content, whereas solubility of CO2 increased with increasing pH. A non-linear relationship was observed between CO2 solubility and the moisture-to-protein ratio of experimental samples. Overall, such knowledge may be applied to improve the quality and consistency of eye-type cheese, and in particular to avoid development of undesirable slits and cracks.
Description
Keywords
Carbon dioxide solubility , Casein matrices , Slit and crack defects , Eye-development
Citation
Lamichhane, P., Sharma, P., Kelly, A. L., Risbo, J., Rattray, F. P. and Sheehan, J. J. (2021) 'Solubility of carbon dioxide in renneted casein matrices: effect of pH, salt, temperature, partial pressure, and moisture to protein ratio', Food Chemistry, 336, 127625 (7pp). doi: 10.1016/j.foodchem.2020.127625