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Title:Sinteza, optimizacija in aplikacija hitozanskih in alginatnih aerogelov ter njunih kompozitov : magistrsko delo
Authors:ID Varda, Katja Andrina (Author)
ID Novak, Zoran (Mentor) More about this mentor... New window
ID Pantić, Milica (Comentor)
Files:.pdf MAG_Kravanja_Katja_Andrina_2020.pdf (3,65 MB)
MD5: 4CEEAC2A3B6175C24EED9E24688153A9
PID: 20.500.12556/dkum/bf7e9e95-45fa-4df4-986e-9c7fe25c4f88
 
Language:Slovenian
Work type:Master's thesis/paper
Typology:2.09 - Master's Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:Namen magistrskega dela je bil raziskati potencial aerogelov kot nosilcev za oralno dostavo aktivnih učinkovin, z željo po izboljšanju njihove biodostopnosti in doseganju kontroliranega sproščanja v prebavnih tekočinah. Aerogeli nastanejo s tvorbo gelov, v katerih se tekoča faza odstrani in nadomesti s plinasto. Perspektivni nosilci aktivnih učinkovin so zaradi svoje visokoporozne strukture, nizke gostote in velike specifične površine. V sklopu eksperimentalnega dela smo najprej s sol-gel sintezo in superkritičnim sušenjem sintetizirali aerogele. Zaradi biokompatibilnosti, biorazgradljivosti in cenovne dostopnosti smo kot izhodiščne materiale izbrali hitozan in alginat. Pridobljene hitozanske in alginatne aerogele ter njune kompozite v različnih koncentracijah smo karakterizirali s plinsko adsorpcijo, termično analizo z DSC/TGA, določanjem deleža nabrekanja in Fourierjevo transformacijsko infrardečo spektroskopijo. Karakterizacija je služila za izbor aerogelov z najboljšimi lastnostmi za impregnacijo z aktivnimi učinkovinami. Kot aktivni učinkovini smo izbrali fenofibrat in esomeprazol, ki sta slabo topna v vodnih medijih in je zato njuna absorpcija v telesu otežena. Fenofibrat se uporablja za zdravljenje hiperholesterolemije, esomeprazol pa za zmanjševanje izločanja želodčne kisline. Aktivni učinkovini smo v aerogele vezali z dvema različnima postopkoma impregnacije, s superkritično impregnacijo (SCI) in z difuzijo iz topila med sol-gel sintezo (DIF). Uspešnost vezave aktivnih učinkovin v aerogele smo izračunali preko merjenja absorbanc z UV-Vis spektrometrom. Nazadnje smo testirali sproščanje aktivnih učinkovin iz aerogelov v simuliranih tekočinah prebavnega trakta. Rezultati so pokazali uspešno vezavo aktivnih učinkovin v aerogele. Tako pri impregnaciji fenofibrata kot tudi esomeprazola v aerogele smo v primerjavi s čistimi učinkovinami dosegli izboljšano oz. bolj kontrolirano sproščanje.
Keywords:aerogeli, polisaharidi, prevleke, aktivne učinkovine, impregnacija, sproščanje
Place of publishing:Maribor
Place of performance:Maribor
Publisher:[K. A. Kravanja]
Year of publishing:2020
Number of pages:X, 57 f.
PID:20.500.12556/DKUM-78050 New window
UDC:544.774.2(043.2)
COBISS.SI-ID:39440899 New window
NUK URN:URN:SI:UM:DK:2FRKCDY3
Publication date in DKUM:25.11.2020
Views:1200
Downloads:336
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FKKT
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Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:11.10.2020

Secondary language

Language:English
Title:Synthesis, optmization and application of chitosan and alginate aerogels and their composites
Abstract:The aim of the master thesis was to investigate the potential of aerogels as drug carriers for oral delivery to improve the bioavailability of the selected model drugs and to achieve their controlled release in simulated gastrointestinal fluids. Aerogels are prepared by the formation of gels in which the liquid phase is removed and replaced by a gaseous phase. They are promising drug carriers due to their highly porous structure, low density and large specific surface area. The experimental work includes the production of aerogels by sol-gel synthesis and supercritical drying. Chitosan and alginate were selected as precursor materials because of their biocompatibility, biodegradability and affordability. The obtained chitosan and alginate aerogels and their composites in different concentrations were characterized by gas adsorption, thermal analysis with DSC / TGA, determination of the swelling ratio and Fourier-transform infrared spectroscopy. The characterization was used to select aerogels with the best properties for impregnation with model drugs. Fenofibrate and esomeprazole were chosen as model drugs due to their poor solubility in aqueous medias and the resulting difficult absorption in the body. Fenofibrate is used to treat hypercholesterolemia and esomeprazole to reduce gastric acid. Two different impregnation methods were chosen for loading aerogels with drugs: supercritical impregnation (SCI) and diffusion from the solvent during sol-gel synthesis (DIF). The drug loadings in aerogels were calculated by measuring the absorbances with a UV-Vis spectrometer. Finally, the drug release profiles from aerogels in simulated gastrointestinal fluids were determined. The results showed successful loading of model drugs in aerogels. By impregnation of the aerogels with fenofibrate and esomeprazole an improved and more controlled release was achieved.
Keywords:aerogels, polysaccharides, coatings, drugs, impregnation, release


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