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Mikrobiologie čerstvých a polotvrdých sýrů – změny v počtech významných skupin mikroorganismů v průběhu výroby a skladování.
Vítová, Jana
The aim of the thesis was to find out whether the numbers of important groups of microorganisms in fresh and semi-hard cheeses change during storage. Changes in the number of microorganisms were detected by microbiological analysis, where significant groups of microorganisms were determined. The total number of microorganisms, psychrotrophic microorganisms, coliforms including Escherichia coli, lactic acid bacteria and micromycetes including yeasts and molds were detected. The microorganisms were detected in fresh cheeses packed in boxes, vacuum packed stored for 14 days and stored for 21 days. The fresh cheeses were produced in the dairy manufactory of the Faculty of AgriSciences at Mendel University and contained four different concentrations of cream starter. For the semi-hard cheeses microbiological analysis was carried out on delivery of the cheeses to the laboratory and subsequently at an interval of either 14 days or 8 weeks. The semi-hard cheeses were obtained from the market. Very low numbers of coliforms and moulds were detected in packaged fresg cheeses. On the other hand, due to the longer storage time, there was a significant decrease in lactic acid bacteria. Longer storage period resulted in higher detection of yeast and psychrotrophic microorganisms. As for semi-hard cheeses that were analysed after 8 weeks, there was a decrease in the total number of microorganisms and lactic acid bacteria. For semi-hard cheeses analysed after 14 days, higher total numbers of microorganisms, psychrotrophic bacteria and moulds were detected. No coliforms were detected in any of the semi-hard cheeses, including Escherichia coli. The results of the work showed that vacuum packaging of fresh cheeses can extend their shelf life. However, longer storage times reduce lactic acid bacteria.
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Vliv způsobů balení na mikroflóru masa
Zemánková, Kristýna
This diploma thesis deals with methods of packaging influenced the microbiological contamination of meat. The relation among develompment of microbiological contamination and color of meat, according on time of storage and methods of packaging. The first part deals with quality of the meat,chemical composition of meat and post mort changes, when muscles are changed to meat, which we can proces and consume. The main part of the thesis pays methods of packaging and microbiological contamination of meat. The last section describes main bacterias which can cause alimentary diseases. Part of this work is experimental determination of the major groups of microorganisms which can significally affect the quality of the meat. A comparison was made between aerobically refrigerated meat and vakuum preserved meat between 1, 3, 7 and 11 days. As a sample was used pork and poultry. The color of meat was concurrently assessed at the same time by Konica Minolta CM-3500d device. The results were evaluated by CMs-100w Spectramagic NX, indicate values of CIE L*a*b*. The methods of packaging greatly influenced durability dependent on the development of contaminating microflora and color of meat.
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Balení potravin v ochranné atmosféře
Stachovcová, Kamila
This bachelor thesis is focused on packaging food in a protective atmosphere and the migration of components from the packaging into food. This thesis gathers information about the most used packaging materials, their applications in practise, or the legislative requirement that are their integral part. In general, packaging is used to protect the product from external influences. The information on the packaging of the product must be unambiguously, clear and in accordance with the actual legislation. The next part in this thesis is about the protective atmosphere. Oxygen, nitrogen and carbon dioxide are gases which are used in modified atmosphere. Air in packaging is replaced with the gases. Vacuum packaging and controlled atmosphere are the next methods for product protective. The next part is about migration components from the packaging into food. The last one is issue of the occurence of phthalates in the packaging materials.
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Obaly na maso a masné výrobky a jejich označování
Heinereichová, Iva
The bachelor thesis called Packaging of meat and meat products and labeling deals with programs packaging of meat and meat products. This work elaborates the legislative requirements, available studies and publications about given problem. It characterizes and highlights the legislative requirements in Czech Republic commonly consumed meats (pork, poultry and beef). Further defines packaging as such and describes the features that are important in food packaging. The work is focused on the consumer packaging for meat and meat products with which customers encounter daily in the market. The largest part of the work is therefore devoted to technological and shipping packaging meat products and modern ways of wrapping meat and meat products. It also highlights the risk of migration of constituents from packaging materials into food, which can threaten the health of consumers. A final chapter describes the food labeling, which is important in terms of consumer awareness.
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Effect of packaging technology for shelf-life products
RYKROVÁ, Lucie
Microbiological quality of food is important both because of hygiene and health and has a significant influence on the shelf life of foods. The aim of this thesis was to evaluate samples of meat products for contamination by microorganisms. There was soft meat product, the product heat-processed and heat-treated. Evaluated how they affect the product and then cutting up into the vacuum packaging the total number of microorganisms, the influence of ambient temperature on the development of bacteria and the production have been using the new technology will benefit the health quality of the product. As revealed from the results, a product bar showed fewer organisms than product, which was sliced and then packaged in a vacuum. The fault was apparently slicing equipment that was not completely disinfected, and there was a transfer of bacteria. Therefore, it is necessary to improve sanitation and to see to their strict compliance. Resulting in the effect of temperature on the growth of microorganisms. The rising temperature is increased, the number of microorganisms. Use of air-conditioned chambers in the production of meat products is shown in terms of reducing the total number of microorganisms as a positive.
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