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폴리에스테르 섬유 감량시스템용 프로세서 타이트레이터 개발
조진호,이흥락,이종현,김명남,구성모,김무영,진경찬,유병희,강민수,김국진 경북대학교 센서기술연구소 1993 연차보고서 Vol.1993 No.-
폴리에스테르 섬유 감량시스템의 제어를 위해서는 처리조 내에서 감량되는 섬유가 목표 감량치에 도달했는지를 판단해 주는 장치가 필요하다. 본 연구에서는 가성소다용액의 초농도 및 섬유 감량 정도의 정확한 측정과 감량 종료시간의 산출 및 이에 따른 종료신호를 발생할 수 있는 폴리에스테르 섬유 감량기 전용의 자동적정장치를 개발하였다. To control caustic soda treatment system for the polyester fabric reduction, we need the device to determine that the fabric has been arrived target reduction value. In this study, we develope an automatic process titrator for the caustic soda treatment system. Major functions of the target titrating system are accurate measurements of the caustic soda concentration and then producing the end point signal for caustic soda treatment system.
Cho, Heui Kyoung,Cho, Jin Hun,Cheong, In Woo WILEY-VCH Verlag 2007 Macromolecular symposia Vol.249 No.1
<P>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 W<SUB>1</SUB>/O/W<SUB>2</SUB> multi-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 W<SUB>1</SUB> phase was found to be more effective. The copolymers decreased the size of the multi-emulsions and enhanced emulsion stability.</P>
Cho, Heui Kyoung,Cho, Jin Hun,Choi, Sung-Wook,Cheong, In Woo Informa UK, Ltd. 2012 Journal of microencapsulation Vol.29 No.8
<P>This article describes enhanced skin permeation and UV/thermal stability of retinol emulsions by the co-stabilisation of Tween20 and biodegradable poly(ethylene oxide)-<I>block</I>-poly(<I>&egr;</I>-caprolactone)-<I>block</I>-poly(ethylene oxide) (PEO-PCL-PEO) triblock copolymers having different lengths of hydrophobic PCL block. A triblock copolymer with a longer PCL block has a lower hydrophile-lipophile balance (HLB) value. Commercial Retinol 50C® (BASF Co., Ludwigshafen, Germany) was used as the source of retinol. Ultrasonication of the Retinol 50C® emulsion with the triblock copolymers led to an increase in retinol solubilisation and a decrease in average particle size of the resulting retinol emulsion. These characteristics improved skin permeation of retinol through the stratum corneum of artificial skin and subsequent proliferation of viable epidermis cell. Employment of the triblock copolymer with a longer PCL block increased both UV and thermal stabilization of the retinol. These results suggest that HLB and PCL block length are important factors to enhance the topical delivery of retinol into the skin.</P>
Polymeric vehicles for topical delivery and related analytical methods
Cho, Heui Kyoung,Cho, Jin Hun,Jeong, Seong Hoon,Cho, Dong Chul,Yeum, Jeong Hyun,Cheong, In Woo 대한약학회 2014 Archives of Pharmacal Research Vol.37 No.4
Recently a variety of polymeric vehicles, such as micelles, nanoparticles, and polymersomes, have been explored and some of them are clinically used to deliver therapeutic drugs through skin. In topical delivery, the polymeric vehicles as drug carrier should guarantee non-toxicity, long-term stability, and permeation efficacy for drugs, etc. For the development of the successful topical delivery system, it is of importance to develop the polymeric vehicles of well-defined intrinsic properties, such as molecular weights, HLB, chemical composition, topology, specific ligand conjugation and to investigate the effects of the properties on drug permeation behavior. In addition, the role of polymeric vehicles must be elucidated in in vitro and in vivo analyses. This article describes some important features of polymeric vehicles and corresponding analytical methods in topical delivery even though the application span of polymers has been truly broad in the pharmaceutical fields.
화장품에서 약물전달 기술의 응용에 관한 동향 및 최신기술 리뷰
조희경(Heui-Kyoung Cho),홍우진(Woo-Jin Hong),한현탁(Hyun-Tak Han) 한국화장품미용학회 2016 한국화장품미용학회지 Vol.6 No.2
Recently a variety of drug delivery system (DDS) have been explored and some of them are clinically used to deliver therapeutic drugs through skin. In topical delivery, the polymer based DDS as drug carrier should guarantee non-toxicity, long-term stability, and permeation efficacy for drugs, etc. For the development of the successful topical delivery system, it is of importance to develop the polymeric vehicles of well-defined intrinsic properties, such as molecular weights, HLB, chemical composition, topology, specific ligand conjugation and to investigate the effects of the properties on drug permeation behavior. In addition, the role of polymeric vehicles must be elucidated in in vitro and in vivo analyses. This article describes a kinds of theories and studies for skin permeation and some important features of polymer based DDS in topical delivery. Even though the application span of polymers has been truly broad in the cosmetic and pharmaceutical fields.
Topical Delivery of Budesonide Emulsion Particles in the Presence of PEO-PCL-PEO Triblock Copolymers
Cho, Jin-Hun,Baek, Hyon-Ho,Lee, Jung-Min,Kim, Jung-Hyun,Kim, Dae-Duk,Cho, Heui-Kyoung,Cheong, In-Woo The Polymer Society of Korea 2009 Macromolecular Research Vol.17 No.12
This article describes the topical delivery and localization of budesonide through the hairless mouse skin. Two poly(ethylene oxide)-block-poly($\varepsilon$-caprolactone)-block-poly(ethylene oxide) (PEO-PCL-PEO) triblock copolymers (T 222 and T 252) having different CL:EO ratios were added in the preparation of budesonide particles stabilized with poly(vinyl alcohol) (PVA) and Tween 80 under ultrasonication. For comparison, a commercial PEO-PPO-PEO triblock copolymer (F68) was studied under the same condition. To demonstrate the effects of the triblock copolymer, the particle size of budesonide emulsion, entrapment efficiency, and in vitro release were measured and compared. The budesonide particles stabilized by the triblock copolymers had a diameter of ca. 350 nm with entrapment efficiencies of 66-76%. The In vitro release profiles of all samples showed an initial burst followed by sustained release. The skin penetration and permeation of budesonide were analyzed by using a Frantz diffusion cell. T 222 and T 252 exhibited higher total permeation amounts, but lower budesonide penetration amounts, than F68. The results suggest that the partitioning of budesonide in each skin layer can be adjusted in order to avoid skin thinning and negative immune response arising from the penetration of budesonide in blood vessels.
조영,이진희,황인경 한국조리과학회 1995 한국식품조리과학회지 Vol.11 No.5
파, 마늘, 생강, 적생고추, 고추가루의 멸균 추출액의 농도가 2%와 4%가 되도록 첨가한 배지에서 김치의 주된 젖산균들인 Leu. mesenteroides와 Lac. plantarum의 생육을 조사하였는데, 모든 부재료가 Lac. plantarum의 생육을 저해하였으며 마늘은 이 균에의 저해효과가 가장 컸으며, 생강이 Leu. mesenteroides의 생육에 증진 효과를 보였고, 마늘이 역시 Leu. mesenteroides의 생육에 저해효과를 나타내었다. 마늘, 생강 및 고추가루의 연속분획추출 후 멸균액을 배지에 첨가해 역시 두균의 생육정도를 조사하였을 때 마늘의 부탄을 분획물이 두균의 생육에 저해효과를 보여 그 효과물질은 alkaloid나 flavonoid일 것으로, 또 생강과 고추가루의 물 분획물이 Leu. mesenteroides의 생육 촉진 효과를 나타낸 바 그 효과물질은 당류일 것으로 추정되었다. The growth extent of Leuconostoc mesenteroides and Lactobacillus plantarum in the medium which contain sterilized extract of each kimchi minor ingredient (green onion, garlic, ginger, raw red pepper, and red pepper powder) was examined. All minor ingredients decreased the growth of Lac. plantarum, and this effect of garlic is the most distinctive, ginger had the positive effect on the growth of Leu. mesenteroides, and garlic had the negative effect on the growth of Leu. mesenteroides. When the growth extent of two bacteria in the medium which contain sterilized successive extracts of each of garlic, ginger and red pepper powder was examined, the butanol fraction of garlic was represented the negative effect on the growth of Leu. mesenteroides and Lac. plantarum, and the water fraction of ginger and red pepper powder were represented the positive effect on the growth of Leu. mesenteroides.