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There were developed samples of fermented meat products of „Mettwurst“ with an addition of a starter culture pentosacceus AS-3/100 or probiotic culture Lactobacillus casei Lc-01 and its combinations for this thesis. A part of animal fat was replaced with vegetable oils-sunflower oil and rapeseed oil. For comparison, there was also used a sample without an addition of vegetable oil. There were determined the characteristics of fats in samples: saponification value, acidity value, esteric, iodine and peroxide value. The samples were determined on the day of production and always once a week in a period of three following weeks. Every single sample was hereby determined 3 times. According to the results, it is more advantageous to use the samples with sunflower oil with an addition of specific cultures Lactobacillus casei Lc-01 and Pediococcus pentosaceus AS-3/100. The saponification value when adding sunflower oil detects that the quality of fat remains stable till the 14th day of storage (p <0.05). The comparison of acid value detects that a sample with sunflower oil and culture Pediococcus pentosaceus AS-3/100 is more advantageous due to fast acidification in the first half of storage period. Good results of iodine and peroxide value had the variation of a sample with sunflower oil and a combination of both cultures. The variation of peroxide value maintained the lowest values. By using the samples with sunflower oil and unispecific cultures L. casei Lc-01 and P. pentosaceus AS-3/100, the culture P. pentosaceus AS-3/100, which remained stable till the 14th day of production, reached the best values of peroxide value. The sunflower oil is in spite of high content of PUFA more stable to which also contributes the increased content of vitamin E that works as an antioxidant here. The disadvantage of rapeseed oil is its higher susceptibility to oxidation. For reasons of faster decomposition of vegetable oils would be essential to cut down on the minimum durability. From the 14th day of storage, the content of free FA increases and the fat is still considerably quickly oxidized. The content of unsaturated FA, of which the vegetable fat is a source, quickly decreases. The sensory quality simultaneously decreases, too. [ABSTRACT FROM AUTHOR]

In the present study, phenotypic and genotypic methods and MALDI-TOF mass spectrometry were applied for the species identification of 29 out of 30 strains of the genus Lactobacillus isolated from faecal samples of 30 breastfed infants. All strains were tested for growth in milk and/or reconstituted skimmed milk supplemented with 0.5 % yeast extract, production of lactic acid, bile salts and low pH tolerance, and for production of β-glucuronidase. PCR screenings of tyrosine-decarboxylase and histidine-decarboxylase genes were also carried out. Survival of Lactobacillus cells at low pH and their bile tolerance were strain specific. Finally, seven strains of probiotic species were selected for possible use in the dairy industry and for further tests concerning their probiotic characteristics. [ABSTRACT FROM AUTHOR]