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Title:Inovacijske tehnologije pridobivanja eteričnih olj in antioksidantov iz suhih listov rožmarina : magistrsko delo
Authors:ID Kugl, Nina (Author)
ID Knez Marevci, Maša (Mentor) More about this mentor... New window
ID Majer, David (Comentor)
ID Bauman, Davorin (Comentor)
Files:.pdf MAG_Kugl_Nina_2025.pdf (3,27 MB)
MD5: 6BA6E2B909B4CF32A5C7566071D9754E
 
Language:Slovenian
Work type:Master's thesis/paper
Typology:2.09 - Master's Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:Namen magistrske naloge je bil pridobiti podatke o vplivu različnih tehnik obdelave suhih listov rožmarina na vsebnosti antioksidantov in na koncentracijo eteričnih olj (EO) v rožmarinu. Iskali smo metode, s katerimi lahko uspešno pridobivamo antioksidanta rožmarinsko kislino (RK) in karnozolno kislino (KK) ter EO iz mletih, suhih listov tunizijskega rožmarina. Preverili smo, kako uporabljene metode vplivajo na vsebnost antioksidantov in koncentracijo EO (γEO) v rožmarinu, tako da smo vsebnost antioksidantov in γEO v obdelanem rožmarinu primerjali z vsebnosti antioksidantov in γEO, pridobljenih iz rožmarina, ki ga nismo predhodno obdelali. Primerjali smo tehnike mehanskega peletiranja, izpostavitve rožmarina v avtoklavu pri 70°C in različno visokih tlakih plinov N2 in CO2 ter mikrovalovno ekstrakcijo brez topil (SFME). Iz tako obdelanega rožmarina smo nato z hidrodestilacijo s Clevengerjevim aparatom destilirali EO, z acetonsko ekstrakcijo pa smo pridobili suhi praškast produkt z visoko vsebnostjo naravnih antioksidantov. Obdelane liste rožmarina in praškast ekstrakcijski produkt smo analizirali s tehnikama tekočinske kromatografije visoke ločljivosti z detektorjem UV-VIS in plinsko kromatografijo s plamensko ionizacijskim detektorjem. Ugotovili smo, da smo s SFME najbolj znižali γEO v rožmarinu, kjer se po 10 min obdelavi koncentracija EO znižala za 80,52%. γEO v rožmarinu pa se je najmanj znižala pri mehanskem peletiranju. Najvišje vsebnosti antioksidantov RK in KK v rožmarinu smo določili v rožmarinu, ki je bil obdelan z mehanskim peletiranjem. V rožmarinu, obdelanem z mehanskim peletiranjem smo prav tako določili najvišje izkoristke ekstrakcije z acetonom.
Keywords:rožmarin, antioksidanti, eterična olja, SFME, peletiranje, hidrodestilacija, avtoklaviranje
Place of publishing:Maribor
Place of performance:Maribor
Publisher:[N. Kugl]
Year of publishing:2025
Number of pages:1 spletni vir (1 datoteka PDF (X, 53 str.))
PID:20.500.12556/DKUM-90480 New window
UDC:665.2:562.943.16(043.2)
COBISS.SI-ID:229012739 New window
Publication date in DKUM:11.03.2025
Views:157
Downloads:57
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FKKT
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Licences

License:CC BY-ND 4.0, Creative Commons Attribution-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nd/4.0/
Description:Under the NoDerivatives Creative Commons license one can take a work released under this license and re-distribute it, but it cannot be shared with others in adapted form, and credit must be provided to the author.
Licensing start date:04.09.2024

Secondary language

Language:English
Title:Innovative technologies for the extraction of essential oils and antioxidants from dried rosemary leaves
Abstract:The aim of the master thesis was to obtain data on the effect of different processing techniques of dried rosemary leaves on the antioxidant content and the concentration of essential oils (EO) in rosemary. We sought methods to successfully extract the antioxidants rosmarinic acid (RK) and carnosic acid (KK) and EOs from ground, dried leaves of Tunisian rosemary. We evaluated how the applied methods affected the antioxidant content and EO concentration (γEO) in rosemary by comparing the antioxidant content and γEO of treated rosemary with those in untreated rosemary. The methods of mechanical pelletization, treatment rosemary in an autoclave at 70 °C and different pressures of N2 and CO2 gases, and solvent-free microwave extraction (SFME) were compared. The EO were then distilled from the treated rosemary by hydrodistillation with a Clevenger apparatus, and acetone extraction was used to obtain a dry powdered product with a high content of natural antioxidants. The treated rosemary and the powder extraction product were analysed by high-performance liquid chromatography with UV-VIS detector and gas chromatography with flame ionisation detector. We found that SFME most significantly reduced γEO in rosemary, where γEO decreased by 80.52% after 10 min of treatment. The EO concentration in rosemary decreased the least with mechanical pelletization. The highest antioxidant content of RK and KK in rosemary was determined in rosemary treated by mechanical pelletization. Extraction of rosemary trated by mechanical pelletization also yielded the highest extraction recoveries of the dry powder product.
Keywords:rosemary, antioxidants, essential oils, SFME, pelletization, hydrodistillation, autoclaving


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