Effects of substracting urea-N, non-protein-N or other N-fractions from total-N for in-plant monitoring when processing milk into dairy products
1995
Marshall, K.R. (New Zealand Dairy Research Inst., Palmerston North (New Zealand))
When processing milk into dairy products, in-plant monitoring is undertaken to provide control of the process and to determine (1)the quality and composition of feed milk, final product and by-products; (2) the yield of products; and (3) the economics of production. For dairy products containing protein, measurement of the protein content of the feed milk, final product and by-products is frequently required. Measurement of protein may be either by determination of Kjeldahl nitrogen by reference or standard methods, or by instrumental techniques, generally calibrated against Kjeldahl nitrogen determinations. In considering the definition of protein and proposals to discount the non-protein-nitrogen or the urea-nitrogen fraction from the total nitrogen, one consideration that needs to be studied is the impact of the definition of protein on in-plant monitoring. This paper considers protein determinations for in-plant monitoring, particularly with reference to the yield of products.
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