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The influence of alkaline earth metal equilibria on the rheological, melting and textural properties of Cheddar cheese

Published online by Cambridge University Press:  15 October 2013

Darren R Cooke  and
Paul LH McSweeney
Darren R Cooke
Affiliation:
School of Food and Nutritional Sciences, University College Cork, Cork, Ireland
Paul LH McSweeney*
Affiliation:
School of Food and Nutritional Sciences, University College Cork, Cork, Ireland
*
*For correspondence; e-mail: p.mcsweeney@ucc.ie
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Abstract

The total calcium content of cheese, along with changes in the equilibrium between soluble and casein (CN)-bound calcium during ripening can have a major impact on its rheological, functional and textural properties; however, little is known about the effect of other alkaline earth metals. NaCl was partially substituted with MgCl2 or SrCl2 (8·7 and 11·4 g/kg curd, respectively) at the salting stage of cheesemaking to study their effects on cheese. Three cheeses were produced: Mg supplemented (+Mg), Sr supplemented (+Sr) and a control Cheddar cheese. Ca, Mg and Sr contents of cheese and expressible serum obtained therefrom were determined by atomic absorption spectroscopy. Addition of Mg2+ or Sr2+ had no effect on % moisture, protein, fat and extent of proteolysis. A proportion of the added Mg2+ and Sr2+ became CN-bound. The level of CN-bound Mg was higher in the +Mg cheese than the control throughout ripening. The level of CN-bound Ca and Mg decreased during ripening in all cheeses, as did % CN-bound Sr in the +Sr cheese. The presence of Sr2+ increased % CN-bound Ca and Mg at a number of ripening times. Adding Mg2+ had no effect on % CN-bound Ca. The +Sr cheese exhibited a higher G′ at 70 °C and a lower LTmax than the control and +Mg cheeses throughout ripening. The +Sr cheese had significantly lower meltability compared with the control and +Mg cheeses after 2 months of ripening. Hardness values of the +Sr cheese were higher at week 2 than the +Mg and control cheeses. Addition of Mg2+ did not influence the physical properties of cheese. Supplementing cheese with Sr appeared to have effects analogous to those previously reported for increasing Ca content. Sr2+ may form and/or modify nanocluster crosslinks causing an increase in the strength of the para-casein matrix.

Keywords

Calcium equilibriumcolloidal calcium phosphateCheddar cheeserheology
Type
Research Article
Information
Journal of Dairy Research , Volume 80 , Issue 4 , November 2013 , pp. 418 - 428
Copyright
Copyright © Proprietors of Journal of Dairy Research 2013 

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