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The viscosity index of lactic casein I

Authors: R. M. Dolby


An investigation was made of three methods of determining viscosity index based on the following solutions: 1. 9% casein in sodium hydroxide solution; 2. 10% casein in ammonia solution; 3. 15% casein in borax solution. Differences between samples were much more obvious with (3) than with (1) or (2). Method (3) was evidently the most useful for judging suitability of caseins for paper coating. It had the additional advantage that with normal caseins the pH of the final solutions fell in the narrow range (6.7-7.0) in which pH differences had little effect on viscosity.

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