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Evaluation of milk compositional variables on coagulation properties using partial least squares

Published online by Cambridge University Press:  07 October 2014

Julie H Bland ,
Alistair S Grandison  and
Colette C Fagan
Julie H Bland*
Affiliation:
Department of Food and Nutritional Sciences, University of Reading, Whiteknights, PO Box 226, Reading, RG6 6AP, UK
Alistair S Grandison
Affiliation:
Department of Food and Nutritional Sciences, University of Reading, Whiteknights, PO Box 226, Reading, RG6 6AP, UK
Colette C Fagan
Affiliation:
Department of Food and Nutritional Sciences, University of Reading, Whiteknights, PO Box 226, Reading, RG6 6AP, UK
*
*For correspondence; e-mail: j.h.bland@pgr.reading.ac.uk
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Abstract

The aim of this study was to investigate the effects of numerous milk compositional factors on milk coagulation properties using Partial Least Squares (PLS). Milk from herds of Jersey and Holstein-Friesian cattle was collected across the year and blended (n=55), to maximise variation in composition and coagulation. The milk was analysed for casein, protein, fat, titratable acidity, lactose, Ca2+, urea content, micelles size, fat globule size, somatic cell count and pH. Milk coagulation properties were defined as coagulation time, curd firmness and curd firmness rate measured by a controlled strain rheometer. The models derived from PLS had higher predictive power than previous models demonstrating the value of measuring more milk components. In addition to the well-established relationships with casein and protein levels, CMS and fat globule size were found to have as strong impact on all of the three models. The study also found a positive impact of fat on milk coagulation properties and a strong relationship between lactose and curd firmness, and urea and curd firmness rate, all of which warrant further investigation due to current lack of knowledge of the underlying mechanism. These findings demonstrate the importance of using a wider range of milk compositional variables for the prediction of the milk coagulation properties, and hence as indicators of milk suitability for cheese making.

Keywords

Milk coagulation propertiespartial least squaresmilk composition
Type
Research Article
Information
Journal of Dairy Research , Volume 82 , Issue 1 , February 2015 , pp. 8 - 14
Copyright
Copyright © Proprietors of Journal of Dairy Research 2014 

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