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Title:PRIPRAVA PEKTINSKIH AEROGELOV ZA ORALNO DOSTAVO AKTIVNIH UČINKOVIN
Authors:ID Tkalec, Gabrijela (Author)
ID Novak, Zoran (Mentor) More about this mentor... New window
ID Knez, Željko (Comentor)
Files:.pdf UNI_Tkalec_Gabrijela_2013.pdf (15,61 MB)
MD5: 4C390DC33338A9276477F232E36882F8
 
Language:Slovenian
Work type:Undergraduate thesis
Typology:2.11 - Undergraduate Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:V farmacevtski industriji se pogosto uporablja sistem kontroliranega sproščanja učinkovin, saj nudi vrsto prednosti v primerjavi s farmacevtskimi oblikami s takojšnjim sproščanjem. Za kontrolirano sproščanje in oralno dostavo aktivnih učinkovin so izjemno zanimivi aerogeli iz naravnih polisaharidov, ki so netoksični, biorazgradljivi, biokompatibilni, dostopni in cenovno ugodni. Primerni so predvsem alginat, guar, ksantan, hitozan in pektin. V naših raziskavah smo za pripravo aerogelov uporabili pektin. Pektin je naravni polisaharid in se v veliki meri uporablja v farmacevtski ter prehrambeni industriji kot gelirno sredstvo. Nahaja se v večini rastlin kot gradnik celic. Zaradi svojih lastnosti je uporaben za sintezo biorazgradljivih aerogelov za oralno dostavo aktivnih učinkovin. Namen diplomskega dela je bil pripraviti pektinske aerogele, ki so obstojnejši in stabilnejši od ostalih gelov, ter jih uporabiti kot nosilce aktivnih učinkovin za kasnejše kontrolirano sproščanje. Za sintezo smo uporabljali dve vrsti pektina – pektin iz jabolk ter pektin iz agrumov. Pripravili smo pektinske monolite in pektinske sferične aerogele. Vodo v hidrogelu smo postopno izmenjali s 100% etanolom, etanol pa smo kasneje odstranili s superkritičnim sušenjem s CO2. Po superkritičnem sušenju smo izmerili specifično površino, velikost in volumen por. Vsi trije parametri so bili izjemno visoki pri pektinskih multi-membranskih sferičnih aerogelih (nad 500m2/g), in ker je površina/volumen ena ključnih spremenljivk pri kontroli sproščanja aktivnih učinkovin, so bile te primernejše za vezavo aktivne učinkovine od pektinskih monolitov. S sproščanjem aktivne učinkovine iz multi-membranskih sferičnih aerogelov smo preverjali vpliv vrste pektina, vrste aktivne učinkovine ter številnosti membran na sproščanje učinkovine. Po sproščanju aktivne učinkovine smo določili tudi mehanizem sproščanja. Kot aktivni učinkovini smo uporabili teofilin in nikotinsko kislino.
Keywords:pektin, aerogeli, kontrolirano sproščanje, oralna dostava.
Place of publishing:Maribor
Publisher:[G. Tkalec]
Year of publishing:2013
PID:20.500.12556/DKUM-41403 New window
UDC:544.774.2-961(043.2)
COBISS.SI-ID:17495830 New window
NUK URN:URN:SI:UM:DK:NHYZ4GMW
Publication date in DKUM:05.09.2013
Views:3286
Downloads:475
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FKKT
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Secondary language

Language:English
Title:PREPARATION OF PECTIN AEROGELS FOR ORAL DRUG DELIVERY
Abstract:Controlled drug delivery is widely used troughout the pharmaceutical industry since there are many positive side effects compared to immediate-release dosage form. There is a wide interest in natural polysaccharides in controlled drug delivery systems due to their being non-toxic, biodegradable, biocompatible, abundantly available and less expensive. Apropriate are alginic acid sodium salt, guar gum, xanthan gum, chitosan and pectin. For the preparation of aerogels we used pectin. Pectin is a natural polisacharyde widely used troughout pharmaceutical and food industry as a gel agent. Pectins are present in the walls that surround growing and dividing plant cells. Because of it's properties it can be used for the synthesis of biodegradable aerogels for oral drug delivery. The aim of this research was to prepare stable and resistant pectin aerogels. For the sinthesys, two types of low methoxyl pectin were used – citrus and apple pectin. Pectin monolithic and spherical aerogels were prepared and then supercritically dried using CO2. After supercritical drying BET, pore size and pore volume were measured. Surface area of the multi-membrane pectin aerogels was extremely high – more than 500nm2. Since surface area/volume is one of the key parameters in controlling drug release, multi-membrane pectin aerogels were used as drug delivery carriers. The effects of the pectin's compositions and types, types of a model drug and number of membranes were investigated. Also the release mechanism was determined. Theophylline and nicotinic acid were used as model drugs.
Keywords:pectin, aerogel, controlled drug delivery, oral drug delivery.


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