| | SLO | ENG | Cookies and privacy

Bigger font | Smaller font

Show document Help

Title:Imobilizacija encimov na visoko porozne polimerne nosilce : magistrsko delo
Authors:ID Berložnik, Lara (Author)
ID Paljevac, Muzafera (Mentor) More about this mentor... New window
ID Krajnc, Peter (Comentor)
Files:.pdf MAG_Berloznik_Lara_2024.pdf (5,33 MB)
MD5: 49B78E67912ABBB4042390E7F32FD825
 
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 razviti učinkovite postopke za sintezo poroznih polimernih materialov v različnih oblikah, kot so monoliti in zrna. Monolitne materiale smo pripravili s polimerizacijo v masi in s polimerizacijo zunanje faze emulzij z visokim deležem notranje faze, medtem ko smo zrna sintetizirali s suspenzijsko polimerizacijo. Zrna smo nato uporabili kot nosilce za imobilizacijo encimov. Najprej smo sintetizirali monolitne poli(glicidil metakrilat-ko-etilen glikol dimetakrilatne) materiale s polimerizacijo v masi, pri čemer smo uporabili različne deleže porogenega topila, ki so variirali med 0 in 200 vol. % glede na volumen monomerov. Produkt je bil krhek material, pri čemer se je z nižjimi deleži porogena tvoril material z neporozno morfologijo, z višjimi deleži pa t.i. cvetačna morfologija. S polimerizacijo zunanje faze emulzij z visokim deležem notranje faze, inducirano termično ali s fotopolimerizacijo ter uporabo zamreževala v deležih od 5 mol % do 25 mol %, smo pridobili monolitne materiale s celično morfologijo. Pore v teh materialih so bile raznolike tako po obliki kot po velikosti. Materiale smo karakterizirali z vrstičnim elektronskim mikroskopom za določitev morfologije,FTIR spektroskopijo in elementno analizo za določitev kemijske sestave ter porozimetrijo za določitev porazdelitve velikosti por in specifične površine. Sintetizirana in okarakterizirana poli(glicidil metakrilat-ko-etilen glikol dimetakrilatna) zrna smo uporabili kot nosilce za imobilizacijo encima lipaze iz Candida cylindracea. Imobilizacijo encima smo izvedli na poroznih in neporoznih zrnih, tako z uporabo distančnika in mrežnega zamreževalca kot brez njiju. Imobilizacija je bila uspešna v vseh primerih, pri čemer je bila nekoliko bolj učinkovita ob uporabi distančnika in mrežnega zamreževalca, kar smo potrdili s testno reakcijo hidrolize 4-nitrofenil butirata. Učinkovitost vezave encima smo preverjali z določanjem koncentracije proteina pred in po imobilizaciji z Bradfordovo metodo.
Keywords:poliHIPE material, HIP emulzija, suspenzijska polimerizacija, imobilizacija encima, Lipaza Candida Cylindracea
Place of publishing:Maribor
Place of performance:Maribor
Publisher:[L. Berložnik]
Year of publishing:2024
Number of pages:1 spletni vir (1 datoteka PDF (XIII, 66 f.))
PID:20.500.12556/DKUM-90712 New window
UDC:577.15:[54.057:678.744.33](043.2)
COBISS.SI-ID:221210883 New window
Publication date in DKUM:04.10.2024
Views:0
Downloads:62
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:17.09.2024

Secondary language

Language:English
Title:Immobilization of enzymes on highly porous polymer supports
Abstract:The aim of this master thesis was to develop efficient methods for the synthesis of porous polymeric materials in various forms, such as monoliths and beads. The monolithic materials were prepared by bulk polymerization and polymerization of the outer phase of high internal phase emulsions, while the beads were synthesized by suspension polymerization. The beads were then used as carriers for the immobilization of enzymes. First, we synthesized monolithic poly(glycidyl methacrylate-co-ethylene glycol dimethacrylate) materials by bulk polymerization using different amounts of porogenic solvents ranging from 150 to 450 vol% relative to the monomer volume. The product was a brittle material, with lower porogen concentrations resulting in a non-porous morphology, while higher concentrations resulted in a so-called cauliflower morphology. By polymerizing the outer phase of high inner phase emulsions, initiated thermally or by photopolymerization, and using crosslinkers at concentrations ranging from 5 to 25 mol%, we obtained monolithic materials with cellular morphology. The pores in these materials varied in both shape and size. The materials were characterized by scanning electron microscopy to determine the morphology, by FTIR spectroscopy and elemental analysis to determine the chemical composition, and by porosimetry to determine the pore size distribution and specific surface area. The synthesized and characterized poly(glycidyl methacrylate-co-ethylene glycol dimethacrylate) beads were used as carriers for the immobilization of Candida cylindracea lipase. Immobilization of the enzyme was performed on both porous and non-porous beads, with and without the use of a spacer and crosslinker. Immobilization was successful in all cases, although a slightly higher efficiency was observed when a spacer and crosslinker were used, as confirmed by the 4-nitrophenylbutyrate hydrolysis test reaction. The efficiency of enzyme binding was evaluated by determining the protein concentration before and after immobilization using the Bradford method.
Keywords:polyHIPE material, HIP emulsion, suspension polymerization, enzyme immobilization, Candida cylindracea lipase


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