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DOI: 10.5593/SGEM2016/HB63/S12.087

RESEARCH ON PERIOD OF STORAGE MILK COW UHT

F. Cola, M. Cola
Friday 11 November 2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, SGEM Vienna GREEN Extended Scientific Sessions, www.sgemviennagreen.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-79-7 / ISSN 1314-2704, 2 - 5 November, 2016, Book 6 Vol. 3, 679-684pp, DOI: 10.5593/SGEM2016/HB63/S12.087

ABSTRACT
Real time shelf-life determination of UHT milk can be very time consuming and expensive. New procedures must be developed to predict or estimate shelf-lifes of a food product without running a full length storage trial. The aim of this study was to gain a deeper know-ledge concerning the general and accepted way of performing accelerated storage tests on diary product with oxidation as the delimiting quality failure parameter. The best oxidative indicator was the total hexanal content. The measurement method of hexanal by using GAS Chromatography (GC) together with Q10 predictive method was the procedure for indirect determination of shelf-life of UHT milk. The shelf-life was estimated to be 217 days when is styored at 25 oC, 81 days at 35 oC and 35 days at 45 oC.
Ultra high temperature (UHT) processed milk has a reported shelf-life of 6 to 9 months at room temperature (25 oC). The sensory quality and the shelf-life of UHT milk is governed by the progression of various physic-chemical and biochemical changes after processing. The main changes are due to proteolytic, lipolytic, oxidative and Maillard type reactions [3]. Although UHT processing inactivates most bacteria, some heat-stable enzymes of native and bacterial origin can survive and cause shelf-life limiting defects. Proteolysis is associated with release of tyrosine thet contribute to the development of off-flavours. The B-lactoglobulin-K-casein complexes during heat treatment increase the viscosity of milk [3].

Keywords: UHT milk, accelerated shelf-life test, hexanal, Q10 predictive method

PAPER DOI: 10.5593/SGEM2016/HB63/S12.087, RESEARCH ON PERIOD OF STORAGE MILK COW UHT

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