This master thesis focuses on the effect of cultivation parameters on hyaluronic acid synthesis during its biotechnological production. The cultivation parameters were temperature of the cultivation, aeration, agitation, carbon source and addition of phosphatidylcholine. Changes in molecular weight and yield of hyaluronic acid, growth of biomass and medium viscosity were observed. From the obtained data we learned, that the specific growth rate greatly impacts final characteristics of hyaluronic acid. Under suboptimal temperatures a high molecular weight polymer was synthesised along with comparable yields from the control cultivation. High temperatures (40 °C) caused a dip in molecular weight. The next cultivation parameters were aeration and agitation. The highest molecular weights were obtained in cultivations with high agitation rates and intensive aeration, specifically 1 vvm/800 rpm and 2 vvm/800 rpm. Agitation had a bigger influence on molecular weight than aeration. When the carbon source was changed from sucrose to glucose, the lowest molecular weight and yield were obtained. Addition of phosphatidylcholine with concentration 160 mg/l had a positive effect on the cultivation, where the molecular weight grew and biomass growth was higher.
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:295654 |
| Date | January 2017 |
| Creators | Osičková, Jana |
| Contributors | Pepeliaev,, Stanislav, Franke,, Lukáš |
| Publisher | Vysoké učení technické v Brně. Fakulta chemická |
| Source Sets | Czech ETDs |
| Language | Czech |
| Detected Language | English |
| Type | info:eu-repo/semantics/masterThesis |
| Rights | info:eu-repo/semantics/restrictedAccess |
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