Influence of raw milk quality on fluid milk shelf life

Journal of Dairy Science
D M BarbanoM V Santos

Abstract

Pasteurized fluid milk shelf life is influenced by raw milk quality. The microbial count and somatic cell count (SCC) determine the load of heat-resistant enzymes in milk. Generally, high levels of psychrotrophic bacteria in raw milk are required to contribute sufficient quantities of heat-stable proteases and lipases to cause breakdown of protein and fat after pasteurization. Sanitation, refrigeration, and the addition of CO2 to milk are used to control both total and psychrotrophic bacteria count. It is not uncommon for total bacterial counts of raw milk to be < 10,000 cfu/mL. In the past, fluid milk processors have not focused much attention on milk SCC. Increased SCC is correlated with increased amounts of heat-stable protease (plasmin) and lipase (lipoprotein lipase) in milk. When starting with raw milk that has a low bacterial count, and in the absence of microbial growth in pasteurized milk, enzymes associated with high SCC will cause protein and fat degradation during refrigerated storage, and produce off-flavors. As the ability to kill, remove, or control microbial growth in pasteurized refrigerated milk continues to improve, the original milk SCC will be the factor limiting the time of refrigerated storage before deve...Continue Reading

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Citations

Apr 5, 2012·The Journal of Dairy Research·Nawfal A AlhelfiA Prysor Williams
Nov 11, 2008·Foodborne Pathogens and Disease·B A HouserB M Jayarao
Jan 6, 2012·Foodborne Pathogens and Disease·Paulo de Souza Costa SobrinhoAline Silva Santos
Sep 25, 2007·Applied and Environmental Microbiology·Elionora Hantsis-Zacharov, Malka Halpern
Jul 3, 2013·FEMS Microbiology Reviews·Lisa QuigleyPaul D Cotter
Apr 12, 2016·Journal of Dairy Science·Aili WangAndrea M Dietrich
Jul 16, 2014·Journal of Dairy Science·Karen L WojciechowskiDavid M Barbano
Mar 3, 2017·Journal of Food Science·Eileen B YehMaryAnne Drake
Nov 21, 2017·Journal of Dairy Science·A N SchianoM A Drake
Nov 21, 2017·Journal of Dairy Science·David M Barbano
Nov 21, 2016·Journal of Dairy Science·Jason A TroendleYrjo T Gröhn
Dec 17, 2014·Journal of Dairy Science·J UptonL Shalloo
Mar 12, 2018·Journal of Dairy Science·Hossein JamaliSimon Dufour
Mar 22, 2015·Journal of Dairy Science·F C Ferreira, A De Vries
Dec 25, 2010·Journal of Dairy Science·A G J Velthuis, M A P M van Asseldonk
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Aug 25, 2009·Journal of Dairy Science·A M ElmoslemanyR T Dingwell
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Mar 26, 2013·Journal of Dairy Science·Irma Amelia, David M Barbano
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Jun 4, 2019·The Journal of Dairy Research·Lizandra F PaludettiDavid Gleeson
Dec 19, 2012·Journal of Dairy Science·T J G M LamH Hogeveen

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