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Sinteza hitosan-graft-poli(L-glutamata) [Elektronski vir]Perdih, Peter ; Žagar, EmaHitosan ima zanimive lastnosti, na primer biokompatibilnost, biorazgradljivost, nizko toksičnost, mukoadhezivnost, deluje antimikrobno in tvori hidrogel, zaradi česar je zanimiv za uporabo v ... biomedicinske namene. Ker je hitosan topen le v nekaterih razredčenih vodnih raztopinah kislin, je njegova uporabnost omejena. Hitosan vsebuje v svoji strukturi aminske in hidroksilne funkcionalne skupine. Funkcionalne skupine lahko modificiramo in na ta način pripravimo derivate hitosana z izboljšanimi lastnostmi. Homopolipeptidi ali poliaminokisline so biorazgradljivi in biokompatibilni polimeri, ki jih lahko uporabljamo v biomedicini namesto sintetičnih polimerov, kot je npr. poliakrilna kislina. Sintetične homopeptide lahko pripravimo z definirano strukturo in ozko porazdelitvijo molekulskih mas. Najučinkovitejši sintezni pristop za pripravo dobro definiranih homopolipeptidov je polimerizacija z odpiranjem obroča N-karboksianhidridov L-.-aminokislin (NCA ROP). Namen našega dela je bil pripraviti hitosan-graft-poli(L-glutamat) (chi-g-poliGlu) za peroralno dostavo proteinskih/peptidnih zdravilnih učinkovin. V ta namen smo najprej pripravili sol hitosana in racemne zmesi kafrine-10-sulfonske kisline (CSA), da smo izboljšali topnost hitosana v organskih topilih, in monomer NCA .-benzil-L-glutamata (glu-NCA). V dugi stopnji smo s polimerizacijo z odpiranjem obroča NCA na protonirane aminske skupine hitosana, ki so služile kot iniciator ROP, graftirali poly(.-benzil-L-glutaminske) verige, tako da smo pripravili hitosan-graft-poli(.-benzil-L-glutamat). Odstranitev benzilnih zaščitnih skupin smo proučevali pod različnimi pogoji: i) v kislih pogojih v prisotnosti HBr, ii) pod pogoji alkalne hidrolize, iii) s katalitskim hidrogeniranjem v prisotnosti paladija na aktivnem oglju in iv) s postopkom s trimetilsilil jodidom (TMSI).Source: Slovenski kemijski dnevi 2012, Portorož, 12.-14. september 2012 [Elektronski vir] = Slovenian Chemical Days 2012, Portorož, September 12-14, 2012 (Str. [1-6])Type of material - conference contributionPublish date - 2012Language - slovenianCOBISS.SI-ID - 5068058

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Perdih, Peter | 33213 |
Žagar, Ema | 12318 |
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