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Title:Stabilizacija superoksid dismutaze (sod) iz Pleurotus ostreatus : magistrsko delo
Authors:ID Kuselj, Luna (Author)
ID Leitgeb, Maja (Mentor) More about this mentor... New window
ID Primožič, Mateja (Comentor)
Files:.pdf MAG_Kuselj_Luna_2025.pdf (2,83 MB)
MD5: 9F19C4AFBCCB81390E6B1430768237F2
 
Language:Slovenian
Work type:Master's thesis/paper
Typology:2.09 - Master's Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:Magistrsko delo obravnava stabilizacijo encima superoksid dismutaze (SOD), izoliranega iz Pleurotus ostreatus, užitne gobe z odličnimi antioksidativnimi lastnostmi. Glavni namen raziskave je bil proučiti metode sproščanja intracelularnih encimov iz micelija P. ostreatus, nato pa razviti sistem enkapsulacije izolirane SOD za njeno stabilizacijo. Celice P. ostreatus smo odprli z uporabo dveh različnih metod: s konvencionalno metodo mehanske homogenizacije z rotor-stator homogenizatorjem in z izpostavitvijo superkritičnemu ogljikovemu dioksidu (SC CO2). Učinkovitost celične lize smo ovrednotili z Bradfordovo metodo, s katero smo določili koncentracijo sproščenih intracelularnih encimov, nato pa še z modificirano Marklundovo metodo, s katero smo določili aktivnost izolirane SOD. Encimski ekstrakt smo nato enkapsulirali v alginatne kroglice, ki smo jih izpostavili simulirani želodčni (SGF) in simulirani črevesni tekočini (SIF), da bi in vitro proučili sproščanje SOD v telo. Za karakterizacijo površinskih in strukturnih lastnosti ter kemijske sestave alginatnih kroglic smo uporabili vrstični elektronski mikroskop z emisijsko disperzijsko spektroskopijo (SEM-EDS). Prisotnost funkcionalnih skupin v alginatnih kroglicah smo določili s Fourierjevo transformacijsko infrardečo spektroskopijo (FTIR). Rezultati so pokazali, da je mehanska homogenizacija pri lizi celičnih sten bolj učinkovita. Z njo smo dosegli sprostitev 4,07 mg proteinov na g P. ostreatus, medtem ko s SC CO2 le 0,0629 mg proteinov na g P. ostreatus. Specifična aktivnost SOD je bila pri obeh metodah primerljiva. Natrijev alginat se je izkazal kot odlično enkapsulacijsko sredstvo, ki vzdrži pH pogoje želodca in omogoči postopno sproščanje aktivne SOD v tankem črevesju, kar je ključnega pomena za potencialno peroralno aplikacijo. V SGF se je zaradi kislih pogojev sproščena SOD takoj deaktivirala, medtem ko je bila v SIF najvišja specifična aktivnost SOD dosežena po 180 min izpostavitve. Tedaj je za mehansko homogeniziran vzorec znašala 86,2 % začetne specifične aktivnosti enkapsuliranega vzorca, za SC CO2 vzorec pa 91,4 %. Na podlagi dobljenih rezultatov smo zaključili, da odpiranje celic z mehansko homogenizacijo in enkapsulacija v alginat nudita obetavno strategijo za kontrolirano dostavo encima SOD v tarčna področja znotraj prebavnega trakta.
Keywords:Pleurotus ostreatus, antioksidativni stres, superoksid dismutaza, enkapsulacija, alginatne kroglice
Place of publishing:Maribor
Place of performance:Maribor
Publisher:[L. Kuselj]
Year of publishing:2025
Number of pages:1 spletni vir (1 datoteka PDF (IX, 40 str.))
PID:20.500.12556/DKUM-95702 New window
UDC:577.151:635.8(043.2)
COBISS.SI-ID:261093379 New window
Publication date in DKUM:20.11.2025
Views:155
Downloads:21
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:13.10.2025

Secondary language

Language:English
Title:Stabilization of superoxide dismutase (sod) from Pleurotus ostreatus
Abstract:The master's thesis deals with the stabilization of the enzyme superoxide dismutase (SOD) isolated from Pleurotus ostreatus, an edible mushroom with excellent antioxidant properties. The main purpose of the research was to study the methods of releasing intracellular enzymes from the mycelium of P. ostreatus, and then to develop an encapsulation system for isolated SOD for its stabilization. P. ostreatus cells were opened using two methods: the conventional method of mechanical homogenization with a rotor-stator homogenizer and by exposure to supercritical carbon dioxide (SC CO2). The efficiency of cell lysis was evaluated using the Bradford method to determine the concentration of released intracellular enzymes, and then using the modified Marklund method to measure the activity of isolated SOD. The enzyme extract was then encapsulated in alginate beads, which were exposed to simulated gastric (SGF) and simulated intestinal fluid (SIF) to study the release of SOD into the body in vitro. Scanning electron microscopy with emission dispersive spectroscopy (SEM-EDS) was used to characterize the surface and structural properties and chemical composition of alginate beads. The presence of functional groups in alginate beads was determined by Fourier transform infrared spectroscopy (FTIR). The results showed that mechanical homogenization was more effective in lysis of cell walls. It achieved the release of 4.07 mg of proteins per g of P. ostreatus, while SC CO2 only achieved 0.0629 mg of proteins per g of P. ostreatus. The specific SOD activity was comparable in both methods. Sodium alginate proved to be an excellent encapsulation agent that withstands the pH conditions of the stomach and allows for the gradual release of active SOD in the small intestine, which is crucial for potential oral application. In SGF, the released SOD was immediately deactivated due to acidic conditions, while in SIF, the highest specific SOD activity was reached after 180 min of exposure. At that time, the mechanically homogenized sample had 86.2% of the initial specific activity of the encapsulated sample, and the SC CO2 sample had 91.4%. Based on the obtained results, we concluded that opening the cells by mechanical homogenization and encapsulation in alginate offer a promising strategy for the controlled delivery of the SOD enzyme to target areas within the digestive tract. Based on the results obtained, we concluded that opening cells by mechanical homogenization and encapsulation in alginate offer a promising strategy for the controlled delivery of the SOD enzyme to target areas within the digestive tract.
Keywords:Pleurotus ostreatus, antioxidant stress, superoxide dismutase, encapsulation, alginate beads


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