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21 results on '"Cho, Jin Hun"'

18. cDNA Array Analysis of Gene Expression Profiles in Brain of Mice Exposed to Manganese

Author

BAEK, Sun-Yong, primary, CHO, Jin-Hun, additional, KIM, Eul-Sun, additional, KIM, Hyun-Ju, additional, YOON, Sik, additional, KIM, Bong-Seon, additional, KIM, Jae-Bong, additional, LEE, Choong-Ryeol, additional, YOO, Cheolin, additional, LEE, Ji-Ho, additional, LEE, Hun, additional, PARK, Jungsun, additional, KIM, Jae-Woo, additional, and KIM, Yangho, additional

Published
2004
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20. Effects of Biodegradable Triblock Copolymers on the Microencapsulation of Ascorbic Acid‐2‐Glucoside in W1/O/W2Multi‐Emulsions

Author

Cho, Heui Kyoung, Cho, Jin Hun, and Cheong, In Woo

Abstract

A skin‐active functional material, AA2G (ascorbic acid‐2‐glucoside, W1 phase), was encapsulated via a stepwise emulsification method using PEO‐PLGA‐PEO and PEO‐PCL‐PEO biodegradable triblock copolymers as wall materials. The emulsion stability of the W1/O/W2multi‐emulsions was observed using a ferroxyl test method and on‐line turbidity analysis for a short period of time. The morphology of the multi‐emulsions was observed using the laser confocal and optical microscopes. The use of copolymers in W1phase was found to be more effective. The copolymers decreased the size of the multi‐emulsions and enhanced emulsion stability.

Published
2007
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21. Synthesis and characterization of PEO–PCL–PEO triblock copolymers: Effects of the PCL chain length on the physical property of W1/O/W2 multiple emulsions

Author

Cho, Heui Kyoung, Cho, Kwang Soo, Cho, Jin Hun, Choi, Sung Wook, Kim, Jung Hyun, and Cheong, In Woo

Subjects
*PROPERTIES of matter, *PHYSICAL & theoretical chemistry, *THERMODYNAMICS, *SEPARATION (Technology), *MICROSCOPY
Abstract

Abstract: A series of poly(ethylene glycol)-block-poly(ɛ-caprolactone)-block-poly(ethylene glycol) (PEO–PCL–PEO) triblock copolymers were prepared and then used for the investigation of the effects of the ratio of ɛ-caprolactone to poly(ethylene glycol) (i.e., [CL]/[EO]) on the physical properties of water-in-oil-in-water (W1/O/W2) multiple emulsions containing a model reagent, ascorbic acid-2-glucoside (AA2G). In the synthesis, the [CL]/[EO] was varied from 0.11 to 0.31. The molecular weights and compositions of PEO–PCL–PEO were determined by GPC and 1H NMR analyses. Thermal behavior and crystal formation were studied by DSC, XRD, FT-IR, and polarized optical microscopy (POM). Aggregate behavior of PEO–PCL–PEO was confirmed by DLS, UV, and 1H NMR. Morphology and relative stiffness of the W1/O/W2 multiple emulsions in the presence of PEO–PCL–PEO were studied by confocal laser scanning microscopy (CLSM) and rheometer. Variation in the [CL]/[EO] significantly affects the crystalline temperature and spherulite morphology of PEO–PCL–PEO. As the [CL]/[EO] increases, the CMCs of PEO–PCL–PEO decreases and the slope of aggregate size reduction against the copolymer concentration becomes steeper except for the lowest [CL]/[EO] value of PEO–PCL–PEO (i.e., P-222). P-222 significantly increases the viscosity of continuous (W2) phase, which implies the copolymer would exist in the W2 phase. On the other hand, the triblock copolymers with relatively high [CL]/[EO] ratios mainly contribute to the size reduction of multiple emulsions and the formation of a firm wall structure. The particle size of the multiple emulsion decreases and the elastic modulus increased as [CL]/[EO] increases, confirmed by microscopic and rheometric analyses. [Copyright &y& Elsevier]

Published
2008
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