No 1 (2015)

Results of the work aimed at investigation of the physical effects (ultra-high frequency and ultra-filtration) on the polymer packaging materials modified with antimicrobial additive intended for milk products are given. Decrease of the E. coli and moulds counts under the action of UF-irradiation was proved. Impacts of ultra-high frequency field on the microbiological indices on films surfaces were not established.

Positive effect of the ultra-high frequency energy application in the food technologies is defined not only by processes accleleration but also by some certain impacts on the microbiological objects. Known theoretical suppositions of the bactericide effects of the ultra-high frequency field are not monosemantic. Effects of the field on the sanitary important microflora of the products in the packaging materials with antimicrobial additives were also actively investigated. The impacts of the UHG-field at the defrosting of the curds and antimicrobial additive of the packaging material were studied. Four test samples were investigated reflecting combination of the effects of the UHF-field at defrosting and of the antimicrobial additives to the packaging material and their separate effects as well as defrosting of the packed curds in the air without additional factors influence-control. The packed curds was frozen at -25 °C and was defrosted under the action of the UHF field and in the air after 2,14 and 30 days of low temperature storage .Changes of the microbiological indices in the experimental samples were compared with the indices of the fresh curds. It was demonstrated that application of the UHF-field at curds defrosting results in reduction of the E. coli count by 1-2 orders. Besides, depending on the starting count, quantity of the E.coli decrease was more considerable than the higher its starting count was. Bacteriostatic effect of the UHF-field on yeasts was noted closer to the 30 days of reservation Impacts of the antimicrobial package on the E.coli count lowering in the mass of the packed product were observed at the low temperature storage not earlier than after 30 days and it probably depends on the total mass of the product packed. Synergistic effects of the UHF field and antimicrobial additive on the level of the sanitary significant microflora in the mass of the product were not established in the research work.

Results of the study of the surface-active substances as a main part of the synthetic cleaning agents of different chemical nature and their effects on the microorganisms important for assessment of the sanitarian-hygienic state of the production environment are discussed. It was found, that the character and target of the antimicrobial action of the surface-active agents depend on their chemical nature and concentration.

The immunochromatographic express-tests Singlepath and Duopath (Merck KGaA) are outlined. The tests are intended for rapid detection of certain pathogenic microorganisms (Salmonella spp., Listeria monocytogenes, E. coli-O157, Campylobacter spp.) and bacterial toxins. Application of the tests reduces time of the study, does not need special equipment, is characterized by high reliability and sensitivity. The tests are efficiently used for the express identification of the pathogenic bacteria.

Probiotic activity of many cultures used for receiving of the fermented milk products especially for the functional products was proved . It is explained by their ability to inhibit growth of the pathogenic microorganisms, so-called antibiotic activity. In the work given the antagonistic activity against salmonella was studied.

On the basis of analysis and systematization of the main auxiliary substances used in tableting food, a unified classification system for these substances was created. The main technological methods, used in tableting of food products, were systematized, also the general principle scheme of tableting was proposed.