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Acylated derivatives of pectin: synthesis, characterization and applicative potential

dc.contributor.advisorPopović, Ivanka G.
dc.contributor.otherKalagasidis Krušić, Melina
dc.contributor.otherDžunuzović, Enis
dc.contributor.otherStevanović, Jasmina
dc.contributor.otherNikolić, Ljubiša
dc.creatorŠešlija, Sanja
dc.date.accessioned2019-05-16T10:21:33Z
dc.date.accessioned2019-09-23T13:46:28Z
dc.date.available2019-05-16T10:21:33Z
dc.date.available2019-09-23T13:46:28Z
dc.date.issued2018
dc.identifier.urihttp://eteze.bg.ac.rs/application/showtheses?thesesId=6734
dc.identifier.urihttps://fedorabg.bg.ac.rs/fedora/get/o:19575/bdef:Content/download
dc.identifier.urihttp://vbs.rs/scripts/cobiss?command=DISPLAY&base=70036&RID=51339535
dc.identifier.urihttp://nardus.mpn.gov.rs/123456789/11041
dc.identifier.urihttp://cer.ihtm.bg.ac.rs/handle/123456789/3110
dc.description.abstractIstraživanja u okviru ove doktorske disertacije sprovedena su sa osnovnim ciljemrazvoja derivata pektina unapređene funkcionalnosti u odnosu na primenu ovogpolisaharida kao sorbenta i materijala za izradu ambalažnih filmova. U prvom delu radaopisan je postupak modifikacije pektina u reakciji esterifikacije sa acil-dihloridima,nakon čega su ispitana svojstva dobijenih acilovanih derivata sintetisanih pri različitimmolarnim odnosima agensa za acilaciju i galakturonske kiseline. Utvrđeno je dapromene u strukturi utiču na reološka, termička i morfološka svojstva pektina, kao i nainterakcije koje se uspostavljaju u vodenim rastvorima. U cilju detaljnog sagledavanjasvih parametara koji mogu imati uticaj na sorpciju pektina i njegovih derivata, u drugomdelu rada ispitan je uticaj specifičnih anjona na umrežavanje nativnog pektina uvodenim rastvorima soli bakra. Analiza ovog uticaja rezultovala je uspostavljanjemanalogije umrežavanja pektina sa relativnim uticajem anjona u vodenim rastvorima kojeje opisano Hofmeister-ovom teorijom. Hidrofobnost acilovanih derivata, kao imogućnost njihove primene kao sorbenata i materijala za izradu ambalažnih filmova,ispitana je u trećem delu rada. Dobijeni rezultati ukazuju da acil ostaci (C4-C10) ustrukturi derivata utiču na povećanje hidrofobnosti nativnog pektina, što se možesmatrati jednim od najznačajnijih rezultata proisteklih iz ove disertacije. Parametriprocesa sorpcije Cu2+ jona iz vodenih rastvora ukazuju da acilovani derivati posedujumanji ravnotežni kapacitet u poređenju sa nativnim pektinom, pri čemu je utvrđeno daje vrednost ovog parametra uslovljena strukturom derivata. Filmovi na bazi acilovanihderivata pektina predstavljaju bolju barijeru za transport vodene pare, što se tumači kaoposledica njihove povećane hidrofobnosti. Ipak, rezultati mehaničkih ispitivanjaukazuju da predložene modifikacije nemaju pozitivan uticaj na moguću primenusintetisanih derivata kao materijala za izradu ambalažnih filmova.sr
dc.description.abstractThe main goal of the research conducted within this doctoral dissertation wasdevelopment of pectin based derivatives with improved functionality when used assorbents and packaging film material. The first part of this work reports modificationprocedure and characterization of the derivatives obtained by esterification of the neatpectin using di-acyl chlorides at different molar ratios. It was found that changes instructure affect rheological, thermal and morphological properties of pectin, as well asthe interactions established in water solutions. In order to get the deeper insights into allparameters that could influence the sorption on pectin and its derivatives, the secondpart of this work reports the effect of specific anions on the cross-linking process of neatpectin in water solutions of copper salts. This analysis resulted in establishment of ananalogy between pectin cross-linking and relative influence of anions in water solutionsdescribed by Hofmeister theory. The hydophobicity of acylated derivatives and theirpossibility to be used as sorbents and package film materials was investigated in thethird part of this work. The obtained results indicate that acyl residues (C4-C10) causethe increase in hydrophobicity of neat pectin, which could be considered as one of themost significant result of this dissertation. The parameters that describe sorptionof Cu2+ from aqueous solution suggest that acylated derivatives exhibit lowerequilibrium capacity when compared to native pectin, and it was found that theseparameters are dependent on derivatives structure. Due to the increased hydrophobictyof acylated pectin, the films based on these derivatives have improved water barrierproperties. Still, the results obtained from mechanical testing indicate that proposedmodification do not have positive influence on possible application of films based onacylated pectin as packaging material.en
dc.formatapplication/pdf
dc.languagesr
dc.publisherУниверзитет у Београду, Технолошко-металуршки факултетsr
dc.relationinfo:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/172062/RS//
dc.rightsopenAccess
dc.sourceУниверзитет у Београдуsr
dc.subjectpektin, acilovani derivati, hidrofobnost, umrežavanje, sorpcijasr
dc.subjectpectin, acylated derivatives, hydrophobicity, cross-linking, sorptionen
dc.titleAcilovani derivati pektina: synthesis, characterization and applicative potential.sr
dc.title.alternativeAcylated derivatives of pectin: synthesis, characterization and applicative potentialen
dc.typedoctoralThesisen
dc.rights.licenseBY-NC-ND
dcterms.abstractПоповић, Иванка; Джунузовић, Енис; Стевановић, Јасмина; Николић, Љубиша; Калагасидис Крушић, Мелина; Шешлија, Сања И.;
dc.identifier.fulltexthttp://cer.ihtm.bg.ac.rs/bitstream/id/14019/IzvestajKomisije20009.pdf
dc.identifier.fulltexthttp://cer.ihtm.bg.ac.rs/bitstream/id/14018/Disertacija.pdf
dc.type.versionpublishedVersion


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