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π- Allyl 및 Diethylcarbamate 기에 의해 다리결합된 이핵팔라듐착물의 합성 및 확인
손태일,김용주,김천호 ( Tae Il Son,Yong Joo Kim,Chun Ho Kim ) 한국공업화학회 1995 공업화학 Vol.6 No.4
Reaction of Pd(η³-allyl)Me(PPh₃) with diethylamine under an atmosphere of carbon dioxide gave a dinuclear palladium complex (PPh₃)Pd(μ-η³-C₃H_5)(μ-O₂CNEt₂) in 63% yield which was characterized by IR, NMR, and elemental analysis. Similar reaction with methanol gave an allylether CH₂=CHCH₂OMe of 18% yield.
조직재생을 위한 부직포형 Chitosan Scaffold의 제조와 특성
박세훈 ( Se Hoon Park ),장의찬 ( Eui Chan Jang ),김천호 ( Chun Ho Kim ),손태일 ( Tae Il Son ) 한국키틴키토산학회 2003 한국키틴키토산학회지 Vol.8 No.1
Chitosan fiber를 이용한 부직포형 Chitosan scaffold는 물리적 강도 및 swelling ratioa면에서 Type Ⅲ가 실험의 목적에 가장 적합한 결과를 나타내었으며, 이것을 토끼슬관절의 결손치료에 적용한 결과, 12주만에 이식된 scaffold가 있었던 층과 재생된 연고층 사이에서 연골 하골과 주변 연골과의 융합이 모두 관찰되었다. Recently chitosan and some of its derivatives have been studied for development in a variety of biomedical applications such as artificial skin, artificial blood vessel, absorhable suture due to low-toxicity, bioresoption and hiocompatibility In addition, the wide field of tissue engineering applications is necesaay for biodegradable materids with broad potential. The purpose of this study is to ohtain the biocompdtible unwoven chitosan scaffolds using chitosan fiber and alginate fur tissue engineering. We prepared three types of nonwoven chitosan scaffolds and performed various testes on the prepared nonwoven chitosan scaffolds.(Type Ⅰ, Type Ⅱ, Type Ⅲ) First of all, we prepared chitosan fiber [DA 82%(powder), acetic acid (4%, v/v)] hy a modified wet spinning technique [Spinneret: KASEN Co.] and then put cutten fiber in each mold by weight(4g, 5g, 6g). After that, 1%(v/v) acetic acid or 3%(wlw) sodium alginate acqneous solution is dropped on the surface of each mold nonwoven chitosan scaffolds were completely prepared by lyophilization method. It was appeared the preferred result in Type Ⅲ nonwoven chitosan scaffold compared with the result in Type Ⅰ and Type Ⅱ unwoven chitosan scaffolds for the swelling experiment. the mechanical behaviour and the SEM characterization. In addition, relative chondrocytes proliferation in nonwoven chitosan scaffolds was determined by MTI mitochondria1 reduction. Furthermore we observed the effect of tissue regeneration via implantation of Type Ⅲ nonwoven scaffold(the highest relative cell proliferation) into Newzealand white rabbit articular cartilage. In conclusion, twelve weeks after implantaion, the defect filled with Type Ⅲ nonwoven scaffold was replaced with newly formed hyaline-like cartilage tissue and subchondral hone, which were well integrated with adjacent host cartilage.
음이온성기온 carboxy 기를 가진 chitosan 유도체의 제조와 그들의 응집 특성에 관한 연구
이배훈 ( Bea Hoon Lee ),정병옥 ( Byung Ok Jung ),손태일 ( Tae Il Son ),김천호 ( Chun Ho Kim ) 한국키틴키토산학회 2003 한국키틴키토산학회지 Vol.8 No.1
양이온성 천연 고분자 전해질인 chitosan에 음이온기의 도입에 따른 특징을 연구하기 위해 chitosan을 4-chlorobutyric acid 또는 5-chlorovaleric acid와 반응시킴으로써 n-propyl, n-butyl기를 가지는 새로운 carboxyalkyl chitosan 유도체를 합성하였다. 합성된 carboxyalkyl chitosan 유도체들의 구조적인 변화는 EA와 FT-IR로 확인하였다. 이들 carboxyalkyl chitosan 유도체들은 chitosan에 비해 낮은 결정성을 가짐을 X-선 분석을 통해 확인할 수 있었다. 또한 카올린 현탁액을 이용한 응집 실험 결과는 pH가 5,carboxyalkyl chitosan의 농도가 5ppm, 25ppm 일 때 최적의 응집 성능을 나타내었다. Novel carboxyalkyl chitosan derivatives with n-propyl, n-butyl groups were prepared by reacting chitosan with 4-chlorobutyric acid and 5-chlorovaleric acid. The structural changes in the samples were confirmed by using EA and FT-IR. Resulting chitosan derivatives have the low crystallinity, which were confirmed by XRD. Their flocculating behavior, in kaloine suspension showed the optimum property at pH 5 and 5 ppm, 25 ppm concentration of resin conditions.
Carboxyalkyl chitosan 유도체의 금속이온 흡착 특성
이배훈 ( Lee Bae Hun ),정병옥 ( Jeong Byeong Og ),노인섭 ( No In Seob ),손태일 ( Son Tae Il ),손영숙 ( Son Yeong Sug ),김천호 ( Kim Cheon Ho ) 한국키틴키토산학회 2004 한국키틴키토산학회지 Vol.9 No.1
N/A Novel carboxyalkyl chitosan derivatives with n-propyl, n-butyl groups were prepared by reacting chitosan with 4-chlorobutyric acid and 5-chlorovaleric acid. The structural changes in the samples were confirmed by using elementary analysis, and FT-IR. The chelating abilities of chitosan and carboxyalkyI chitosan derivatives for metal ions (Cu(2+), Ca(2+), Mg(2+), and K(+)) were investigated by the batch method. The adsorptivity of carboxyalkyI chitosan derivatives at pH9 was almost the same at pH 6. The carboxyalkyI chitosan derivatives showed improved metal ion adsorption performances compared to chitosan. The chelating ability of carboxyalkyI chitosan derivatives increased with an increating in the chain length of the alkyI substitutes.