Študija uporabe imobilizirane lipaze iz Mucor miehei pri sintezi momooleil glicerola : magistrsko delo
Pečnik, Simona, 1964-
V naši študiji smo raziskovali sintezo monooleil glicerola, ki poteka v treh stopnjah: blokada primarne in sekundarne hidroksilne skupine glicerola z acetonom, encimsko katalizirana esterifikacija ...neblokirane hidroksilne skupine rac-1,2-izopropiliden glicerola z oleinovo kislino in deblokado primarne in sekundarne hidroksilne skupine nastalega estra. Poudarek naših raziskav je bil na reakciji esterifikacije, ki smo jo katalizirali z lipazo iz Mucor miehei (Lipozyme TH), imobilizirano na anionsko izmenjevalno smolo. Reakije smo izvajali v diskontinuirnem mešalnem reaktorju. Ugotovili smo, da so optimalni reakcijski pogoji za naš reakcijski sistem temperatura 55 oC in tlak 0,057 bar. Pri teh pogojih smo dosegli maksimalno presnovo oleinove kisline (X = 80%) ob najnižji potrebni aktivirni energiji reakcije (Ea = 20, 82 kJ/mol). Določili smo tudi nekatere druge termodinamske vrednosti za preiskovano rekcijo, kot n.pr. entalpija in entropija aktivacije esterifikacije ter standardna Gibbsova prosta energija. Optimalna količina dodanega encinskega preparata znaša 1g/g reakcijske mešanice. Raziskava Michaelis-Mentenine kinetike je pokazala, da poteka preiskovana reakcija po mehanizmu dvojne premestitve (ping-pong). Kinetika oz. Dinamika esterifikacijepa ustreza modelu reverzibilne reakcije drugega reda.
Type of material - master's thesis
Publication and manufacture - Maribor : [s.n.], 1992
pisarna A-003 (FERI) MD PEČNIK S. ŠTUDIJA
pisarna A-003 (FERI) MD PEČNIK S. ŠTUDIJA
available - reading room
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