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Utilization of novel strategies of alginate crosslinking in the development of next-generation bioinoculants
Gašparová, Dominika ; Pekař, Miloslav (oponent) ; Sedláček, Petr (vedoucí práce)
This master's thesis focuses on diverse alginate crosslinking strategies, aiming to advance the development of next-generation bioinoculants. Investigating various gelation strategies is applied to five commercially available alginates and isolated bacterial alginate. Experiments focused on alginate macrogel preparation assessed the occurrence and quality of crosslinking, which was analyzed by incorporating both amplitude and frequency testing methodologies. Selecting appropriate crosslinking agents and determining their concentrations were essential objectives. Crosslinking agents such as those containing zinc chloride, aluminum chloride, barium chloride, calcium sulphate and ferric chloride solution were evaluated, with all proving effective in both macro- and microencapsulation processes. Optimization efforts included studying crosslinking conditions, with favorable results observed at a temperature of 7°C and optimal crosslinking durations ranging from 30 to 120 minutes. Comparative analyses of six selected crosslinking agents revealed notable findings in gel swelling studies and mechanical property assessments via the squeeze test, thermogravimetric analysis and image analysis. Barium crosslinking demonstrated promising results in preserving water content during rehydration, while zinc-based crosslinking achieved the highest dry matter content. Image analysis unveiled smaller gel beads formed with aluminum and barium crosslinking agents, indicating their effectiveness. Microencapsulated gel beads, particularly those crosslinked with barium, showed potential due to their reduced size. The experiment's pinnacle was the bacterial culture's gelation, where aluminum and barium crosslinking solutions yielded the smallest particle sizes. Notably, barium crosslinking resulted in the smallest area and error bar, indicating its effectiveness.
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The application aspects of thermochromic textile coating
Štaffová, Martina ; Tocháček, Jiří (oponent) ; Kučera, František (vedoucí práce)
This paper presents a literature review of thermochromic pigments and their application into polymers. The research carried out an improved understanding of leuco dye based thermochromic pigments as well as their application in polyurethane textile coating. For the incorporation, the method floating knife was used and optimum adjustment is presented. The thermal and colour fastness properties of thermochromic coating were examined.
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Využití mikroenkapsulace v potravinářství
Hofbauerová, Lucie
Tato bakalářská práce je teoretická, je zaměřena na využití mikroenkapsulace v potravinářském průmyslu. Cílem této práce je vypracování literární rešerše, kde budou shrnuty aktuální poznatky o využívání procesů mikroenkapsulace v potravinářství. Součástí je přehled jednotlivých metod a materiálů, aplikovaných v potravinářství. Z metod jsou zde uvedeny například potahovaní, koacervace, extruze, sušení rozprašováním, elektrosprejování, elektrostatické zvlákňování a další. Z nejčastěji aplikovaných materiálů jsou zde zahrnuty polysacharidy, proteiny, tuky a vosky. Z proteinů jsou zastoupeny jak rostlinné proteiny, tak živočišné. Z proteinů živočišných jsou používány například mléčné bílkoviny nebo želatina, z rostlinných hrachový, zeinový či proteiny z chia semínek. Z polysacharidů je zde uveden škrob, chitosan, maltodextriny či arabská guma. U jednotlivých materiálů jsou uvedeny jejich fyzikální a chemické vlastnosti a příklady jejich aplikace.
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The application aspects of thermochromic textile coating
Štaffová, Martina ; Tocháček, Jiří (oponent) ; Kučera, František (vedoucí práce)
This paper presents a literature review of thermochromic pigments and their application into polymers. The research carried out an improved understanding of leuco dye based thermochromic pigments as well as their application in polyurethane textile coating. For the incorporation, the method floating knife was used and optimum adjustment is presented. The thermal and colour fastness properties of thermochromic coating were examined.
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