共查询到20条相似文献,搜索用时 78 毫秒
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甲壳素的酰基化及其有生物材料上的应用 总被引:2,自引:0,他引:2
介绍了甲壳素及其衍生物的酰基化反应、产物的制备方法、酰化产物的性能及其用于生物医用材料上的最新进展。甲壳素及其衍生物的酰基化改性是一种很有价值的化学改性途径,不仅可改善酰化产物在有机溶剂中的溶解性或水溶性,而且产物作为生物材料具有许多独特的用途。 相似文献
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部分N—酰化脱乙酰壳多糖的水溶性 总被引:3,自引:0,他引:3
甲壳素由于氢键缔结使其溶解度太小,而限制了应用.在甲壳素分子上引入大的酰基可改善其在有机溶剂中的溶解性.用冷冻强碱处理的方法也可制得水溶性甲壳素,但此法会引起甲壳素的降解.本文报导脱乙酰壳多糖的一些N-酰化衍生物,探讨它们的水溶性与N-酰化度等的关系. 相似文献
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一种新的液晶高分子——丁酸壳聚糖的合成与表征 总被引:18,自引:2,他引:18
甲壳素几乎不溶于任何溶剂,由于其脱乙酰化产物壳聚糖含自由氨基,能被酸质子化而溶解,所以壳聚糖的应用领域远多于甲壳素.但是壳聚糖也仅能溶于酸性介质中,并不能溶于纯水和普通有机溶剂,因而人们对甲壳素或壳聚糖进行各种化学改性[1,2],寻求溶解性更好尤其能溶于水的衍生物,以扩大其应用范围.本文按文献[2~4]方法合成了O-丁酰化壳聚糖(简称丁酸壳聚糖),首次报道它具有溶致液晶性. 相似文献
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甲壳素/甲壳胺的聚集态结构及性能 总被引:15,自引:0,他引:15
制备了不同脱乙酰度的甲壳素,并对脱酰化反应进行了研究,找出了适合不同脱酰度甲壳素的溶剂,探讨了制样温度与甲壳胺膜的结晶形态和力学性能之间的关系,比较了甲壳素、甲壳胺及不同来源甲壳素的结晶形态. 相似文献
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生物高分子液晶的新家族——甲壳素及其衍生物 总被引:11,自引:0,他引:11
讨论了生物高分子甲壳素及其衍生物形成液晶态的基本结构条件。简要介绍了为制备液晶性甲壳素衍生物所必须的一些主要的化学修饰途径。综述了十几年来甲壳素衍生物(主要是壳聚糖及其衍生物)液晶性的研究进展。介绍了甲壳素及其衍生物的液晶纺丝及其应用前景。指出甲壳素衍生物已成为纤维素之外生物高分子液晶的一个新的大家族。 相似文献
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Kuprina E. E. Timofeeva K. G. Vodolazhskaya S. V. 《Russian Journal of Applied Chemistry》2002,75(5):822-828
Electrochemical processes for preparation of various chitin materials are examined. Physicochemical and biochemical properties of the products are studied, particularly the effect of deproteinization and degreasing of chitin materials on their sorption and other characteristics. 相似文献
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Y Nishioka S Kyotani H Masui M Okamura M Miyazaki K Okazaki S Ohnishi Y Yamamoto K Ito 《Chemical & pharmaceutical bulletin》1989,37(11):3074-3077
Cisplatin (CDDP) containing albumin microspheres and microcapsules incorporating biodegradable macromolecules, chitin and chitosan, were prepared, and their CDDP content and releasing ability and susceptibility to various enzymes were examined. Chitin was incorporated during preparation of the microspheres, while chitosan was used to treat preformed microspheres. CDDP content was remarkably increased by chitin; when chitin was incorporated at a concentration of 1.5%, the CDDP content of the microspheres was found to be 16.2% (1.8 times that with no addition of chitin). CDDP release was suppressed by chitin and chitosan. The 50% CDDP release time was about 1.5 h when no chitin was added, but about 16 h was required when chitin was incorporated into the microspheres at a concentration of 1.5%. Chitin and chitosan suppressed the decomposition by protease. The microspheres treated with 70% deacetylated chitosan showed the greatest susceptibility to lysozyme. In conclusion, CDDP release can be controlled by the use of chitin or chitosan, and the microspheres should show no immunogenicity in vivo because of their susceptibility to lysozyme. 相似文献
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O-羧甲基甲壳素制备条件的研究 总被引:1,自引:0,他引:1
甲壳素除了某些特殊溶剂如:2-六氟甲醇、二甲基乙酰胺-氯化锂和三氯醋酸-二氯乙烷可使其溶解外,其它溶剂都难以使其溶解,所以开发其水溶性产品扩大其应用范围势在必行。甲壳素在碱性条件下可与氯乙酸反应,在C6的-OH基中导入-CH2COOH基[1,2,3]... 相似文献
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E. M. Tretenichenko V. M. Datsun L. N. Ignatyuk L. A. Nud’ga 《Russian Journal of Applied Chemistry》2006,79(8):1341-1346
The chemical composition of Obelia longissima hydroid polyp from mariculture system fouling community was examined. Conditions for chitin recovery and chitosan preparation thereof were developed. The initial raw material, chitin, and chitosan were characterized by electron microscopy, infrared spectroscopy, and X-ray diffraction analysis. Also, certain qualitative characteristics of these materials were determined. 相似文献
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Data on preparation of chitin threads for the fabrication of absorbable suture materials, dressings, and biodegradable substrates for the growth of human skin cells (keratinocytes and fibroblasts) are analyzed. 相似文献
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Chitin is one of the most abundant natural resources. chitosan is deacetylated from chitin. As natural organisms, chitosan is easier to be decomposed with organisms and eatable. So chitosan is wildly used in biology, medicine, foodstuff, cosmetics and so on[1,2] Chitin is a sort of natural glucosamine compound with wealthy resources, but a large amount of chitin is prepared from crab shell and crayfish shell. Some research works have carried on the preparation of chitosan from other resources, such as silkworm pupa, waste mycelia etc.[3,4] 相似文献