Ekstrakcija polifenola primjenom vodenog dvofaznog sustava s eutektičkim otapalom u makro- i mikroekstraktoru

master's thesis

• Title (english): Extraction of pholyphenols using the aquaeous two-phase system with eutectic solvent in macro- and microextractor
• Author: Nela Milićević
• Mentor: Ana Jurinjak Tušek (mentor)
• Granter: University of Zagreb; Faculty of Food Technology and Biotechnology; (Department of Process Engineering); (Laboratory for Measurement, Regulation and Automatisation); Zagreb
• Defense date and country: 2019-07-15, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Biotechnology

Abstract

Cilj ovoga rada bio je ispitati potencijal primjene vodenog dvofaznog sustava s eutektičkim otpalom za ekstrakciju polifenola u makro- i mikroekstraktoru. U okviru rada, na temelju učinkovitosti ekstrakcije, kao pogodno eutektičko otapalo odabran je kolin-klorid: etilen-glikol. Primjenom metode odzivnih površina procijenjeni su optimalni uvjeti za provedbu procesa ekstrakcije u šaržnom makroekstraktoru: masa DES-a od 1,25 g, koncentracija soli od 0,95 g mL-1, vrijeme ekstrakcije od 15 min, temperatura ekstrakcije od 50 °C, koncentracija galne kiseline od 60 mg L-1 te je uočeno da je temperatura varijabla koja najviše utječe na učinkovitost ekstrakcije. Pri navedenim optimalnim uvjetima provedeni su pokusi ekstrakcije u kontinuiranom mikroekstraktoru te je postignuta učinkovitost ekstrakcije od približno 94 % za vrijeme zadržavanja od 2,43 s što predstavlja značajan napredak usporedbi sa šaržnim procesom gdje je za vrijeme ekstrakcije od 15 min postignuta učinkovitost ekstrakcije od 88 %.

Abstract (english)

The aim of this work was to investigate the potential of aqueous two-phase system with eutectic solvents for extraction of polyphenols in macro- and microextractor. Based on the efficiency of the extraction, choline chloride: ethylene-glycol was selected as a suitable eutectic solvent. Using the Response surface method, the optimum conditions for the aqueous two-phase system extraction in the batch conditions were estimated (DES weight of 1.25 g, salt concentration of 0.95 g mL-1, 15 minute extraction time, extraction temperature of 50 °C, galic acid concentration of 60 mg L-1) and it was observed that the temperature is the most important variable for the extraction efficiency. Extraction experiments in a continuous microextractor were carried out at selected optimum conditions, and the extraction efficiency of the of approximately 94 % was achieved at the residence time of 2.43 s, which represents a significant improvement compared to the batch process where the extraction efficiency of 88 % was achieved for extraction time of 15 min.

• Keywords: mikroekstraktor; ekstrakcija polifenola; vodeni dvofazni sustav; eutektička otapala
• Keywords (english): microextractor; polyphenol extraction; aqueous two-phase system; eutectic solvents
• Language: croatian
• URN:NBN: urn:nbn:hr:159:677471
• Study programme: Title: Bioprocess Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka bioprocesnog inženjerstva (magistar/magistra inženjer/inženjerka bioprocesnog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2019-12-06 12:34:30