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PAPER SELECTED

The Effect of Some Preservatives on Natural Microflora in Milk Samples

BENDA P
Veterinarni Medicina 40, 1995, 359-364

The paper presents a comparison of the efficiency of some preservatives used for instrumental analysis of microflora composition of milk. The preservatives used in the trial involved potassium bichromate (Merck), Milkofix preparation on the basis of colloidal silver (Trzicky), sodium azide (Janssen Chimica) and Bronopol (PSL Microtabs) - Tab. I, Tab. III. Groups of microorganisms (mesophile microorganisms, coliform microorganisms, lactic fermentation bacteria, enterococci and staphylococci - Tab. II) were selected with respect to their expected occurrence at natural contamination of milk. There were highly significant differences (P = 0.01%) between the preservatives in preservation effect shown as the number of colonies of the particular groups of bacteria. The best preservation effect was determined in Bronopol for all groups of microorganisms (Fig. 2), somewhat worse preservation capacity was found out in potassium bichromate (Fig. 3). Sodium azide (Fig. 4) and Milkofix (Fig. 5) had similar preservation characteristics


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