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유화제로서 PEG-PPG 블록 공중합체를 이용한 Poly(DL-Lactide-co-Glycolide) 나노입자: 제조 및 지용성 약물의 로딩
정택규,김승수,신병철,Taek Kyu Jung,Sung Soo Kim,Byung Cheol Shin 대한화학회 2003 대한화학회지 Vol.47 No.5
In this study, poly(DL-lactide-co-glycolide) nanoparticles loaded with water-insoluble vitamins such as vitamin A (Retinol) and vitamin E acetate were prepared by the emulsification diffusion method. Polymer solution was prepared by the two water-miscible organic solvent, such as ethanol and acetone. Because of its biocompatible property, polyethyleneglycol-polypropyleneglycol diblock copolymer was used as surfactant and stabilizer. The influence of some preparative variables on the nanoparticle formation and on the loading efficiency of active agents, such as the type and concentration of stabilizing agent, the stirring methods, the water/oil phase ratio and the polymer concentration were investigated in order to control and optimize the process. After preparation of nanoparticles loaded with active agent, particle size and distribution were evaluated by the light scattering particle analyzer. The loading efficiency of active agents was evaluated by the UV-visible spectroscopy. As the results, particle size were 50-200 nm and dispersibility was monodisperse. The optimum loading efficiency of active agents was observed 50-60%. It was found that the appropriate of selections of binary solvent mixtures and polymeric concentrations in both organic and aqueous phases could provide good yield and favorable physical properties of PLGA nanoparticles.
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정택규,김영백,임굉,조성준,윤인권,Jung, Taek-Kyu,Kim, Young-Baek,Yim, Going,Cho, Sung-Joon,Youn, In-Kwon 배재대학교 공학연구소 1998 공학논문집 Vol.3 No.1
Hydrosilylation and vromination of vacterial poly($\beta$-Hydroxyalkanoates) containing carbon-carbon double bond or triple bond were carried out. The produced polymers were characterized by IR-spectroscopy and differential scnning calorimetry. Hydrosilylated polymers were characterized crystallinity while brominated polymers had lower degree of crystallinity with increased glass transition temperatures. Mixing polymers containing carbon-carbon triple bonds with Co(II) AND Pt(II) resulted crosslinked polymers.
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저온 감열 특성을 가지는 Comb-Type Grafted Polymer Hydrogels의 합성 및 특성평가
정택규,김승수,신병철,Taek Kyu Jung,Sung Soo Kim,Byung Cheol Shin 대한화학회 2003 대한화학회지 Vol.47 No.1
The comb-type grafted polymer hydrogels, which composed of N-isopropylacrylamide monomer and oligo(N-isopropylacrylamide-co-tert-butylacrylamide) [oligo(NIPAAm-co-t-BAM)], were synthesized by redox polymerization in 5~10% methanol aqueous solution using ammonium peroxodisulfate (APS) at 4 oC for 24h. The lower critical solution temperatures (LCSTs) of the comb-type grafted hydrogels were decreased with increase of t-BAM content in the grafted copolymer. We observed the effect of crosslinker and concentration of oligo(NIPAAm-co-t-BAM) on the shrinking/swelling ratio of hydrogels. Changes of shrinking/swelling ratio were decreased with increase of concentration of crosslinker. The increase of grafted oligo(NIPAAm-co-t-BAM) in the hydrogel shows an fast changes of shrinking/ swelling rate. The comb-type grafted hydrogels are expected to be valuable for the sensing materials of time-temperature labels(TTLs).
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