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Method for Hydrogen Ion Determination of Butter

Blue Valley Research Laboratories, Chicago, Illinois

ABSTRACT

1. The work herein reported constitutes a study of the factors involved in the electrometric determination of the hydrogen ion concentration of butter.
   
2. A simple procedure for the preparation of the butter sample and for the application of the quinhydrone electrode to the hydrogen ion determination is described. Its use as a standard method in similar studies is suggested.
   
3. It is shown that on account of the non-conductive property of butter fat the curd-serum portion must be used in the pH determination.
   
4. The quinhydrone electrode was found to give essentially the same results on butter as the standard hydrogen electrode.
   
5. Dilution of the butter or of the curd-serum mixture caused marked changes in the pH values obtained, leading to erroneous results.
   
6. Removal of the curd from the curd-serum mixture tended to lower the pH value slightly.