THE USE OF GELATIN OLEATE MIXTURES FOR THE DEMONSTRATION OF SMALL AMOUNTS OF CALCIUM¹

Abstract

In a study of the penetrability of gelatin by dyes added to blood serum, Bennhold5 found that it was impossible to use oxalated plasma because the calcium in the gelatin formed a precipitate of calcium oxalate which interfered with the experiments. Although this difficulty can be overcome by the use of ash-free or isoelectric gelatin,6 it seemed probable that the formation of a stabilized ring reaction might furnish a method for the