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Comparison of a Resin Ion-Exchange Method and a Liquid Ion-Exchange Method for Determination of Ionized Calcium in Skimmilk¹

Department of Animal Sciences, Purdue University, Lafayette, Indiana 49707

ABSTRACT

Raw, pasteurized, and sterilized skimmilk samples from the same lot were analyzed for ionized calcium content by a resin method and by a liquid ion-exchange method. The resin IR 120 was used in the cation exchange method of Christianson et al. (6), while an Orio calcium activity electrode was used for the liquid ion-exchange method. The three milk types were analyzed after four days storage at 4 C.

An analysis of variance of the data showed that there was no significant difference between the results obtained for the raw, pasteurized, and sterilized milk by the two methods. Thus, it was concluded that the calcium activity electrode provides an accurate method for determination of the concentration of ionized calcium in skimmilk. The calcium electrode method has the advantage of speed, ease of analysis, and repeatability. The results also indicated that sterilization at 150 C for 5 sec had little or no effect on the concentration of ionized calcium, whereas pasteurization at 65 C for 30 min caused a significant decrease. The decrease in ionized calcium caused by pasteurization still was pronounced after four days of storage at 4 C.

¹ Published with the approval of the Director of the Purdue Agricultural Experiment Station as Journal paper no. 3503.

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				R. R. Gangidi and L. E. Metzger Ionic calcium determination in skim milk with molecular probes and front-face fluorescence spectroscopy: simple linear regression. J Dairy Sci, November 1, 2006; 89(11): 4105 - 4113. [Abstract] [Full Text] [PDF]