Physics

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Determination of Fat and Protein Content of Milk Using He-Ne laser light Scattering
(Addis Ababa University, 2007-03) Abebe, Ermias
The main aim of of this thesis is to build up simple, an accurate and fast method for the determination of fat and protein content in milk. Based on the laser scattering theory, the ratio of the scattered light intensity to the transmitted light intensity, which is called scattered-transmitted method,is taken on as the optical parameter characterizing the fat and protein content. In this way, the influence of the fluctuation of the power of the light source is reduced and the accuracy of determination is enhanced consequently. The method we used can be implemented in diary industries due to its simple methodology and its economic importance because all milk products are sold on basis of fat and protein content.Finally, the data analysis is carried out using curve and surface fitting method. The fat contents of mama and shola homogenized milk types are determined to be 2.9% and 2.7%, respectively. The protein content of mama milk is 3.6% and for shola milk is 3.4%