| | SLO | ENG | Cookies and privacy

Bigger font | Smaller font

Show document Help

Title:In vitro sproščanje deksametazona iz polimernih prevlek za ortopedske vsadke : diplomsko delo univerzitetnega študijskega programa I. stopnje
Authors:ID Harkai, Blažka (Author)
ID Finšgar, Matjaž (Mentor) More about this mentor... New window
ID Varda, Katja Andrina (Comentor)
Files:.pdf UN_Harkai_Blazka_2026.pdf (4,18 MB)
MD5: 376AC794418743F8EB9192B19A929795
 
Language:Slovenian
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:V diplomskem delu smo preučevali in vitro sproščanje deksametazona (DEX) iz bioaktivnih prevlek na osnovi hitozana (CS) in poli(laktid-ko-glikolida) (PLGA), pripravljenih na modelnih ortopedskih vsadkih iz zlitine TiAl6V4. Zaradi slabe topnosti DEX v vodnih medijih smo preučili tudi vpliv njegove enkapsulacije z β-ciklodekstrini (β-CD) na razporeditev v bioaktivni prevleki in posredno sproščanje iz bioaktivne prevleke. Izvedli smo delno validacijo s spektrofotometrijo UV-Vis, določili profile sproščanja DEX in z matematičnimi modeli ovrednotili kinetične mehanizme njegovega sproščanja. V sklopu eksperimentalnega dela smo s kapljičnim nanosom na površini zlitine TiAl6V4 pripravili bioaktivne prevleke in pri fizioloških pogojih izvedli in vitro sproščanje v fosfatnem pufru (PBS). Količino sproščenega DEX smo na podlagi izdelave umeritvene krivulje določili s spektrofotometrijo UV-Vis, pri čemer smo predhodno izvedli delno validacijo analizne metode z določitvijo linearnega koncentracijskega območja, meje zaznavnosti, meje določljivosti, točnosti in natančnosti. Kinetiko sproščanja smo ovrednotili z matematičnimi modeli sproščanja zdravilnih učinkovin. Pokazali smo, da uporabljena polimera pomembno vplivata na kinetiko sproščanja DEX. Prevleke na osnovi CS izkazujejo hitrejše začetno sproščanje zdravilne učinkovine, medtem ko prevleke na osnovi PLGA omogočajo počasnejše in bolj nadzorovano sproščanje. Ovrednotenje kinetike sproščanja DEX z matematičnimi modeli je pokazalo, da izbrani modeli niso zadovoljivo opisali sproščanja DEX, zato na podlagi dobljenih rezultatov ni mogoče zanesljivo opredeliti prevladujočega mehanizma sproščanja. Kljub temu ugotovitve diplomskega dela potrjujejo, da predstavljajo zasnovane bioaktivne prevleke obetaven pristop za lokalno in nadzorovano sproščanje DEX ter imajo potencial za izboljšanje funkcionalnosti in dolgoročne uspešnosti ortopedskih vsadkov.
Keywords:ortopedski vsadki, bioaktivne prevleke, hitozan, poli(laktid-ko-glikolid), deksametazon, in vitro sproščanje zdravilnih učinkovin
Place of publishing:Maribor
Place of performance:Maribor
Publisher:[B. Harkai]
Year of publishing:2026
Number of pages:1 spletni vir (1 datoteka PDF (X, 33 str.))
PID:20.500.12556/DKUM-99458 New window
UDC:615:577.171.7.085.2(043.2)
COBISS.SI-ID:291589379 New window
Publication date in DKUM:11.09.2026
Views:245
Downloads:7
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FKKT
:
Copy citation
  
Average score:(0 votes)
Your score:Voting is allowed only for logged in users.
Share:Bookmark and Share



Hover the mouse pointer over a document title to show the abstract or click on the title to get all document metadata.

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:17.08.2026

Secondary language

Language:English
Title:In vitro release of dexamethasone from polymer coatings for orthopedic implants
Abstract:In this thesis, we investigated the in vitro release of dexamethasone (DEX) from chitosan (CS) or poly(lactic-co-glycolic acid) (PLGA) bioactive coatings applied to model orthopedic implants made of TiAl6V4 alloy. Due to the low solubility of DEX in aqueous media, the effect of its encapsulation with β-cyclodextrins (β-CD) on the drug distribution in bioactive coatings, as well as the drug release from bioactive coatings, is also investigated. Furthermore, partial validation of the analytical method using UV-Vis spectrophotometry is performed, DEX release profiles are obtained, and drug release kinetics are evaluated using various mathematical drug release models. In the experimental part, bioactive coatings are prepared by drop-casting the mixed drug and polymer solution onto the surface of TiAl6V4 alloy, followed by in vitro drug release studies in phosphate-buffered saline (PBS) under the physiological conditions. The amount of released DEX is quantified by UV-Vis spectrophotometry using a calibration curve. Prior to sample analysis, partial validation of the analytical method is carried out by determining the linear concentration range, limit of detection, limit of quantification, accuracy, and precision. The obtained release profiles are subsequently evaluated using mathematical models most commonly used for the determination of drug release kinetics. The results demonstrate that the selected polymers significantly affect the release kinetics of DEX. CS-based coatings exhibit a more burst initial release of the drug, whereas PLGA-based coatings provide a prolonged and more controlled release profile. Analysis of the mathematical models showed that the selected models did not appropriately describe the kinetics of DEX release. Therefore, based on the obtained results, the predominant release mechanism could not be reliably identified. Nevertheless, these findings confirm that bioactive polymer coatings represent a promising strategy for the controlled local delivery of DEX and have the potential to improve the functionality and long-term performance of orthopedic implants.
Keywords:orthopedic implants, bioactive coatings, chitosan, poly(lactic-co-glycolic acid), dexamethasone, in vitro drug release


Comments

Leave comment

You must log in to leave a comment.

Comments (0)
0 - 0 / 0
 
There are no comments!

Back
Logos of partners University of Maribor University of Ljubljana University of Primorska University of Nova Gorica