prikaz prve stranice dokumenta Razvoj nanokompozitnih filmova na bazi kitozana s antimikrobnim djelovanjem
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master's thesis
Razvoj nanokompozitnih filmova na bazi kitozana s antimikrobnim djelovanjem
Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology, 2022. urn:nbn:hr:149:416185
Horvat, Dora
University of Zagreb
Faculty of Chemical Engineering and Technology

Institutional repository: Repository of Faculty of Chemical Engineering and Technology University of Zagreb

Cite this document

Horvat, D. (2022). Razvoj nanokompozitnih filmova na bazi kitozana s antimikrobnim djelovanjem (Master's thesis). Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology. Retrieved from https://urn.nsk.hr/urn:nbn:hr:149:416185

Horvat, Dora. "Razvoj nanokompozitnih filmova na bazi kitozana s antimikrobnim djelovanjem." Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, 2022. https://urn.nsk.hr/urn:nbn:hr:149:416185

Horvat, Dora. "Razvoj nanokompozitnih filmova na bazi kitozana s antimikrobnim djelovanjem." Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, 2022. https://urn.nsk.hr/urn:nbn:hr:149:416185

Horvat, D. (2022). 'Razvoj nanokompozitnih filmova na bazi kitozana s antimikrobnim djelovanjem', Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, accessed 26 November 2024, https://urn.nsk.hr/urn:nbn:hr:149:416185

Horvat D. Razvoj nanokompozitnih filmova na bazi kitozana s antimikrobnim djelovanjem [Master's thesis]. Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology; 2022 [cited 2024 November 26] Available at: https://urn.nsk.hr/urn:nbn:hr:149:416185

D. Horvat, "Razvoj nanokompozitnih filmova na bazi kitozana s antimikrobnim djelovanjem", Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, Zagreb, 2022. Available at: https://urn.nsk.hr/urn:nbn:hr:149:416185

Metadata
TitleRazvoj nanokompozitnih filmova na bazi kitozana s antimikrobnim djelovanjem
Title (english)Development of chitosan-based nanocomposite films with antimicrobial activity
AuthorDora Horvat
MentorZlata Hrnjak-Murgić (mentor)
Committee memberZlata Hrnjak-Murgić (predsjednik povjerenstva)
Committee memberZvonimir Katančić (član povjerenstva)
Committee memberDajana Kučić Grgić (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Chemical Engineering and Technology
Zagreb
Defense date and country2022-09-05, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Chemical Engineering
Abstract
Kitozan je biopolimer koji posjeduje izvrsna antimikrobna, biokompatibilna i biorazgradljiva svojstva, zbog čega nalazi primjenu u brojnim područjima, između ostalog i kao ambalaža za pakiranje hrane. Kako bi se poboljšala antimikrobna svojstva kitozanskih filmova za pakiranje hrane, a tako i produljio rok trajanja i kvaliteta zapakirane hrane, u ovom radu istraženi su kitozanski nanokompozitni filmovi s dodatkom aktivnih tvari. Nanokompozitni kitozanski filmovi pripremljeni su otapanjem kitozana (Cs) velikih molekulskih masa (100.000–300.000 Da) u razrijeđenoj 2 % (v/v) vodenoj otopini octene kiseline, uz dodatak nanočestica: kitozana (NCs), TiO2, Ti-Ag i Ti-Ag-h, ZnO, Zn-Ag i Zn-Ag-h. Nanočestice kitozana (NCs) pripremljene su iz kitozana niske molekulske mase (50.000–190.000 Da) otapanjem u 2 % (v/v) vodenoj otopini octene kiseline, te taloženjem dodatkom neotapala – natrijevog tripolifosfata (Na5P3O10). Dopiranje metalnih oksida (TiO2, ZnO) srebrovim ionima provedeno je miješanjem u suspenziji deionizirane vode gdje su dodane zadane odvage aktivnih tvari TiO2, ZnO i AgNO3. Dobiveni nanokompozitni filmovi karakterizirani su skenirajućom elektronskom mikroskopijom (SEM), difuznom refleksijskom spektroskopijom (DRS), infracrvenom spektroskopijom (FTIR), određivanjem površinskih svojstava mjerenjem kontaktnog kuta (θ) i određivanjem antimikrobnog djelovanja za pet bakterijskih kultura (Staphylococcus aureus, Escherichia coli, Bacillus subtilis, Enterococcus faecalis i Pseudomonas aeruginosa). Analizom rezultata ustanovljeno je da su svi uzorci pokazali antimikrobno djelovanje na sve vrste ispitivanih bakterija, osim uzorka Cs/NCs/Ti-Ag-h, gdje je SEM analizom utvrđena loša dispergiranost nanočestica unutar polimerne matrice.
Abstract (english)
Chitosan is a biopolymer that has excellent antimicrobial, biocompatible and biodegradable properties and due to it has a wide range of the applications and one of them is food packaging. In order to improve the antimicrobial properties, and thus extend the shelf life and quality of packaged foods, chitosan nanocomposite films with active additives were studied in this work. Chitosan-based nanocomposite films were prepared by dissolving chitosan (Cs) of high molecular weight (100.000-300.000 Da) in a diluted 2 % (v/v) aqueous solution of acetic acid, with the addition of nanoparticles: nanochitosan (NCs), TiO2, Ti-Ag and Ti-Ag-h, ZnO, Zn-Ag and Zn-Ag-h. Chitosan nanoparticles (NCs) were prepared from chitosan of low molecular weight (50.000-190.000 Da) by dissolving it in a 2 % (v/v) aqueous solution of acetic acid and were precipitated by adding a non-solvent – sodium tripolyphosphate (Na5P3O10). The doping of metal oxides (TiO2, ZnO) with silver ions was carried out in ain deionized watersuspension where active substances TiO2, ZnO and AgNO3 were mixed in specified ratio. The obtained nanocomposite films were characterized by scanning electron microscopy (SEM), diffuse reflection spectroscopy (DRS), infrared spectroscopy (FTIR), determination of surface properties by measuring the contact angle (θ) and by determination of antimicrobial activity for five different bacterial cultures (Staphylococcus aureus, Escherichia coli, Bacillus subtilis, Enterococcus faecalis i Pseudomonas aeruginosa). The results indicate that all samples showed antimicrobial activity against all types of tested bacteria, except for the Cs/NCs/Ti-Ag-h, where SEM analysis revealed poor dispersion of nanoparticles within the polymer matrix.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:149:416185
Study programmeTitle: Materials Science and Engineering - Graduate study
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra inženjer/inženjerka kemijskog inženjerstva (magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
Type of resourceText
File originBorn digital
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Created on2023-03-10 15:01:28