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Title:PRIMERJAVA KONVENCIONALNE IN SUPERKRITIČNE EKSTRAKCIJE LANENEGA SEMENA
Authors:ID Brumec, Daša (Author)
ID Škerget, Mojca (Mentor) More about this mentor... New window
Files:.pdf UNI_Brumec_Dasa_2011.pdf (2,59 MB)
MD5: 9871C1707971601E6058CDE6B53C0A4D
PID: 20.500.12556/dkum/3f80139a-dec5-4222-b7e4-06dc54bef617
 
Language:Slovenian
Work type:Undergraduate thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:Pri konvencionalni in superkritični ekstrakciji smo kot material uporabili zmleto laneno seme. Kot konvencionalno ekstrakcijo smo uporabili metode: ekstrakcijo po Soxhletu, ekstrakcijo z etanolom pri povišanih tlakih in ekstrakcijo z ultrazvokom. Superkritične ekstrakcije smo izvedli s pomočjo laboratorijske visokotlačne ekstrakcijske naprave, kjer smo s črpalko črpali ogljikov dioksid in propan iz jeklenke v avtoklav skozi nasutje semena pri različnih tlakih in temperaturah ter s pilotno ekstrakcijsko napravo (UHDE) z ogljikovim dioksidom pri tlaku 480 bar in različnih temperaturah. Ekstrakte (laneno olje) smo hranili v embalažah, zaščitenih pred svetlobo v zamrzovalniku. Vsebnost maščobnih kislin v ekstraktih smo analizirali s pomočjo plinske kromatografije. Največji izkoristki pri postopku superkritičnih ekstrakcij s propanom in ogljikovim dioksidom so bili dobljeni z uporabo propana. S tem smo ugotovili, da je laneno olje bolj topno v propanu. Pri konvencionalni ekstrakciji po Soxhletu je bilo olje najbolj topno v heksanu, ki je nepolarno topilo. Pri superkritični ekstrakciji smo dobili največje izkoristke pri najvišjem tlaku in temperaturi. Tlak in temperatura povečata topnost topljenca v izbranem topilu. Največ vrst maščobnih kislin smo dobili pri konvencionalni ekstrakciji po Soxhletu z uporabo etanola. Ugotovljeno je bilo, da so vsi ekstrakti vsebovali znatno nižjo koncentracijo maščobnih kislin od pričakovane.
Keywords:Konvencionalna ekstrakcija, superkritična ekstrakcija, laneno seme, laneno olje, superkritični fluidi, plinska kromatografija, maščobne kisline.
Place of publishing:Maribor
Publisher:[D. Brumec]
Year of publishing:2011
PID:20.500.12556/DKUM-20701 New window
UDC:66.061.34-987(043.2)
COBISS.SI-ID:15770902 New window
NUK URN:URN:SI:UM:DK:GYBCNA4G
Publication date in DKUM:04.10.2011
Views:3418
Downloads:432
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FKKT
:
BRUMEC, Daša, 2011, PRIMERJAVA KONVENCIONALNE IN SUPERKRITIČNE EKSTRAKCIJE LANENEGA SEMENA [online]. Bachelor’s thesis. Maribor : D. Brumec. [Accessed 31 March 2025]. Retrieved from: https://dk.um.si/IzpisGradiva.php?lang=eng&id=20701
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Secondary language

Language:English
Title:COMPARISON OF CONVENTIONAL AND SUPERCRITICAL EXTRACTION OF FLAXSEEDS
Abstract:In conventional and supercritical extraction ground flaxseed was used. Conventional extraction methods used were: Soxhlet extraction, extraction with ethanol at elevated pressures and extraction with ultrasound. Supercritical extractions were carried out using the laboratory high-pressure extraction plant, which pumps carbon dioxide and propane from a cylinder through the be seeds in the extractor at different pressures and temperatures and by using extraction pilot plant (UHDE) with carbon dioxide at a pressure of 480 bar and different temperatures. Extracts (flaxseed oil) have been stored in containers protected from light in the freezer. Fatty acids in the extracts were analyzed by gas chromatography. Maximum yields of supercritical extraction with propane and carbon dioxide were obtained by the use of propane. It was found that flaxseed oil is more soluble in propane. In conventional Soxhlet extraction the oil was the most soluble in hexane, which is non-polar solvent. In supercritical extraction the highest yields were obtained at the maximum pressure and temperature. Increase of pressure and temperature increas the solute solubility in the chosen solvent. Several types of fatty acids were obtained by conventional extraction with Soxhlet aparature. It was found that all extracts contained significantly lower concentrations of fatty acids than expected.
Keywords:Conventional extraction, supercritical extraction, flaxseed, linseed oil, supercritical fluids, gas chromatography, fatty acids.


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