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Wangpimool Kwanjira,Jin-Chul Kim 강원대학교 산림과학연구소 2022 강원대학교 산림과학연구소 학술대회 Vol.2022 No.10
pH and electric field-responsive microparticles composed of cinnamoyl gelatin (CinGel) and cinnamoyl nanocellulose (CinCNC) were prepared by the emulsion method. CinGel and CinCNC were prepared through a condensation reaction. The content of cinnamic acid (CA) residue in CinCNC(3/1), CinCNC(4.5/1), CinCNC(6/1), and CinGel was evaluated to be 15.33%, 11.03%, 2.96%, and 1.56%, respectively. The complexation of CinGel and CinCNC(3/1) in an aqueous solution took place when the pH value of the medium was 3.0 and 4.5. The maximum complexation was obtained when the CinGel/CinCNC(3/1) mass ratio was 3:7. CinGel/CinCNC(3/1) microparticles were prepared by water in oil emulsion method. The release degree of amaranth at pH 8.0 was higher than the release degree at pH 3.0, pH 4.5, and pH 5.5, possibly because of the complexation of CinGel and CinCNC(3/1) under the acidic condition. When increasing the voltage, the release degree would increase. The charge of the microparticle was negative and it would move to the anode. The pH value near the anode can decrease because H+ is produced at the electrode due to water electrolysis. The microparticle was pH-sensitive and it would easily release its content.
Fanyu Zhao,WANGPIMOOL KWANJIRA,김진철 한국생물공학회 2023 Biotechnology and Bioprocess Engineering Vol.28 No.4
Near-infrared (NIR) irradiation-responsive drug carriers are of great interest because the light is tissuepenetrating and the carriers administered into human body can be made to release their payloads at a specific site in an active manner using the external stimulus (i.e., NIR irradiation). In this study, thermo-responsive liposomes bearing gold nanoparticle (GNP) were developed as a NIR irradiation-responsive drug carrier. Dipalmitoylphosphatidylcholine (DPPC) liposome was surface-decorated with hydrophobically modified thiolated carboxymethyl cellulose (Hm TL-CMC)-capped GNP and hydrophobically modified poly(N-isopropylacrylamide) (Hm PNIPAM). GNP was prepared using Hm TL-CMC as a reducing agent for gold ions and a capping material for GNP. DPPC liposomes incorporating Hm TL-CMC-capped GNP and Hm PNIPAM were prepared by a film hydration and sonication method and they exhibited a multi lamellar structure along with GNP on its transmission electron micrograph. The temperatureresponsive release of DPPC liposome was promoted when the liposome was incorporating Hm PNIPAM, possibly due to the thermal contraction of the polymer chains. DPPC liposome incorporating Hm TL-CMC-capped GNP showed a NIR-responsive release, possibly due to the photothermal effect of GNP, and the NIR-responsive release was enhanced when the liposome was bearing Hm PNIPAM.