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A Comparative Study of Methods for Determining Total Solids in Ice Cream

Storrs Agricultural Experiment Station. Storrs, Connecticut

ABSTRACT

1. A total of 50 samples of ice cream was analyzed for total solids. Twelve of these samples were tested by three methods: (a) the Mojonnier, (b) a modified test similar to the one suggested for sweetened condensed milk, (c) a method adapted from the official method for determining solids in sweetened condensed milk. The other 38 samples were analyzed by the first two mentioned methods.
   
2. The Mojonnier method invariably gave higher results than the method adapted from the official test for condensed milk; the average of 12 samples was 0.483 per cent above.
   
3. The modified method in more than 80 per cent of the cases also gave somewhat higher results than the adopted official, but checked closer than the Mojonnier; in 12 samples the average difference was 0.226 per cent.
   
4. In comparing results on 50 samples analyzed by both the Mojonnier and the modified method, the Mojonnier invariably gave higher results. The average of these 50 samples was 0.223 per cent above the modified method.
   
5. Observations as to time required to reach constant weight in modified method seems to indicate that for all practical purposes such as determination of solids in commerical factories, two hours of drying in water oven is sufficient. Whenever time permits and in all cases of careful analytical work, samples should be dried for three hours.
   
6. The data as presented seems to warrant the conclusion that the modified method is a simple, economical and accurate method for determining the per cent of total solids in ice cream.
   
7. As at present there is no official method for determining the per cent of total solids in ice cream the two methods suggested (1) the modified and (2) the method as adapted from the official method for sweetened condensed milk should receive consideration, thought and study as to the desirability of having one of them recognized as the official method.