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Degradation of Natural Phosphorylated Compounds and Added Polyphosphates in Milk by Pseudomonas fluorescens CECT378, Lactococcus lactis CECT539, and Kluyveromyces marxianus CECT10584

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The degradation of natural phosphorylated compounds (galactose-1-phosphate, N -acetyl-glucosamine-1-phosphate, glycerophosphoethanolamine, and glycerophosphocholine) and added phosphorylated compounds (diphosphate) in milk was investigated by phosphorus 31 nuclear magnetic resonance on the incubation of a sterile milk with Pseudomonas fluorescens CECT381, Lactococcus lactis CECT539, and Kluyveromyces marxianus CECT10584. This preliminary study showed that the degradation of these compounds was dependent on the compound, microorganism, and temperature of incubation. K. marxianus CECT10584 did not show any capability to degrade these compounds, and L. lactis CECT539 was only able to degrade diphosphate at its optimum growth temperature. P. fluorescens CECT381 was the most active strain and possessed more hydrolytic capabilities at 10°C than at its optimum growth temperature. It is suggested that cold-induced enzymes are involved in the ability of P. fluorescens CECT381 to hydrolyze the natural phosphorylated compounds in milk. Consequent potential alterations of dairy products are discussed.


Document Type: Research Article

Affiliations: Instituto de Fermentaciones Industriales (C.S.I.C.), Juan de la Cierva 3, 28006 Madrid, Spain

Publication date: July 1, 2002

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