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Study on potential applications of glutamic acid polymer
Čangelová, Katarína ; Skoumalová, Petra (oponent) ; Obruča, Stanislav (vedoucí práce)
The subject of the thesis is study of possible applications of isoform of glutamic acid polymer (-PGA). The theoretical part is focused on the properties of this biopolymer and potential applications in various areas. Producers and mechanisms of biosynthesis are also mentioned. In the experimental part, the polymer was firstly characterised by following methods: FT-IR spectroscopy, TGA, DSC and SEC-MALS. Its isoelectric point, antimicrobial activity and solubility in various solvents were also determined. The biopolymer was also precipitated by divalent cations and its interaction with oppositely charged CTAB surfactant was studied. The main experimental study was researching the effect of -PGA on viability of Saccharomyces cerevisiae and Lactobacillus rhamnosus under stress conditions by flow cytometry. The performed stresses included ethanol exposure, high temperature and freezing stress, in which its effects were compared to conventional cryoprotectants. The cells of the mentioned microorganisms were also stressed osmotically and exposed to model gastrointestinal juices - gastric, pancreatic and bile. The protective effects of -PGA on the cells were recorded in ethanol stress on Lactobacillus rhamnosus. Its excellent cryoprotection properties were confirmed and its protective effect of gastric juice exposure on Saccharomyces cerevisiae cells was also observed. At the end of the experimental part, -PGA/alginate beads suitable for encapsulation of probiotic bacteria and -PGA/chitosan nanoparticles for encapsulation of biologically active substances.
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Produkce, charakterizace a aplikace polymerů kyseliny jablečné a glutamové
Čangelová, Katarína ; Kučera, Dan (oponent) ; Obruča, Stanislav (vedoucí práce)
Predmetom tejto bakalárskej práce bolo štúdium produkcie biopolymérov pomocou mikroorganizmov. Polymér kyseliny jablčnej bol produkovaný kvasinkoidnou hubou Aureobasidium pullulans a na biosyntézu polyméru kyseliny glutámovej bola použitá baktéria Bacillus licheniformis. V teoretickej časti práce sa nachádza charakteristika jednotlivých polymérov, ich mikrobiálnych producentov a možná aplikácia v rôznych oblastiach. Prostredníctvom experimentov bol sledovaný vplyv rozličných podmienok na bunkový rast a produkciu týchto polymérov. Boli optimalizované podmienky kultivácie z hľadiska produkcie polymérov a následne využité odpadové substráty – srvátka a hydinové perie. Mikrobiálne produkovaný polymér kyseliny jablčnej bol hydrolyzovaný s 2 M kyselinou sírovou a koncentrácia jablčnej kyseliny bola analyzovaná IEC s vodivostným detektorom. Koncentrácia polyméru kyseliny glutámovej bola určená spektrofotometrickou metódou s využitím CTAB.
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Study on potential applications of glutamic acid polymer
Čangelová, Katarína ; Skoumalová, Petra (oponent) ; Obruča, Stanislav (vedoucí práce)
The subject of the thesis is study of possible applications of isoform of glutamic acid polymer (-PGA). The theoretical part is focused on the properties of this biopolymer and potential applications in various areas. Producers and mechanisms of biosynthesis are also mentioned. In the experimental part, the polymer was firstly characterised by following methods: FT-IR spectroscopy, TGA, DSC and SEC-MALS. Its isoelectric point, antimicrobial activity and solubility in various solvents were also determined. The biopolymer was also precipitated by divalent cations and its interaction with oppositely charged CTAB surfactant was studied. The main experimental study was researching the effect of -PGA on viability of Saccharomyces cerevisiae and Lactobacillus rhamnosus under stress conditions by flow cytometry. The performed stresses included ethanol exposure, high temperature and freezing stress, in which its effects were compared to conventional cryoprotectants. The cells of the mentioned microorganisms were also stressed osmotically and exposed to model gastrointestinal juices - gastric, pancreatic and bile. The protective effects of -PGA on the cells were recorded in ethanol stress on Lactobacillus rhamnosus. Its excellent cryoprotection properties were confirmed and its protective effect of gastric juice exposure on Saccharomyces cerevisiae cells was also observed. At the end of the experimental part, -PGA/alginate beads suitable for encapsulation of probiotic bacteria and -PGA/chitosan nanoparticles for encapsulation of biologically active substances.
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Produkce, charakterizace a aplikace polymerů kyseliny jablečné a glutamové
Čangelová, Katarína ; Kučera, Dan (oponent) ; Obruča, Stanislav (vedoucí práce)
Predmetom tejto bakalárskej práce bolo štúdium produkcie biopolymérov pomocou mikroorganizmov. Polymér kyseliny jablčnej bol produkovaný kvasinkoidnou hubou Aureobasidium pullulans a na biosyntézu polyméru kyseliny glutámovej bola použitá baktéria Bacillus licheniformis. V teoretickej časti práce sa nachádza charakteristika jednotlivých polymérov, ich mikrobiálnych producentov a možná aplikácia v rôznych oblastiach. Prostredníctvom experimentov bol sledovaný vplyv rozličných podmienok na bunkový rast a produkciu týchto polymérov. Boli optimalizované podmienky kultivácie z hľadiska produkcie polymérov a následne využité odpadové substráty – srvátka a hydinové perie. Mikrobiálne produkovaný polymér kyseliny jablčnej bol hydrolyzovaný s 2 M kyselinou sírovou a koncentrácia jablčnej kyseliny bola analyzovaná IEC s vodivostným detektorom. Koncentrácia polyméru kyseliny glutámovej bola určená spektrofotometrickou metódou s využitím CTAB.
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