A Volumetric Method for the Estimation of Casein in Cow’s Milk.’
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چکیده
The desirability of a rapid and accurate volumetric method for the estimation of casein in cow’s milk has been felt by those engaged in milk studies or conducting food laboratories. The long official method involving the Kjeldahl process often stands in the way of a complete milk analysis, which should include the estimation of this important constituent. The method reported here was evolved three years ago, but for the reason that the much simpler, centrifugal method2 was subsequently developed, it has never been published. The expense of the apparatus necessary for the centrifugal process may deter many laboratories engaged in dairy studies from installing such apparatus. For that reason it appears desirable to publish this volumetric method as developed at that time. Robertson3 in Igo outlined the principles involved in such a method, but did not furnish the necessary constants for a direct application to cow’s milk. Early attempts to titrate milk directly with various indicators for the purpose of a casein determination have proven fruitless. No very definite and sharp end reaction could be obtained, and the disturbing influence of a varying ash content has always worked ‘against the direct application of a volumetric method for this determination. In the method detailed below the casein
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A Volumetric Method for the Estimation of Casein in Cow’s Milk.’
The desirability of a rapid and accurate volumetric method for the estimation of casein in cow’s milk has been felt by those engaged in milk studies or conducting food laboratories. The long official method involving the Kjeldahl process often stands in the way of a complete milk analysis, which should include the estimation of this important constituent. The method reported here was evolved th...
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