Conjugated linoleic acids (CLA) are positional and geometrical isomers of octadecadienoic acid (18:2) and have a variety of beneficial effects for the humans and animals. Main producers of CLA are rumen bacteria, mainly from the genus Butyrivibrio. Many researches are directed towards increasing the concentration of CLA in food products of animal origin. This could be achieved also with the application of suitable probiotic strains of bacteria. One of those is also Pseudobutzrivibrio xzlanivorans My5T. This strain is capable to grow in the presence of linoleic acid (LA, ie. the CLA precursor), at least up to concentrations of 200 g LA/ml. Under these conditions, the lag phase is prolonged, and the growth is slowered down, too. Consequently the bacteria retain their activity. After 24 hour incubation in the medium with LA, the studied strain biohydrogenates the LA to trans-vaccenic acid, which can be then transformed back to CLA by tissue ?9-desaturase, which is present in the animal tissue. The strain Mz5T could be used as a probiotic in animal nutrition in order to increase the quality of the food products of animal origin.
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