查询词典 chitosan

Novel chitosan derivative with long alky groups as the hydrophobic moieties and carboxymethyl groups as the hydrophilic moieties was synthesized. The chemical structure of N-octyl-O, N-carboxymethyl chitosan was characterized via FTIR, 1H NMR and elemental analysis. The physical properties were analyzed with wide angle X-ray diffraction and differential scanning calorimetry.

以天然可生物降解的壳聚糖为原料，通过在壳聚糖6位羟基上引入羧甲基，在2位氨基上引入疏水烷基链，制得N-辛基－O，N-羧甲基壳聚糖两亲性衍生物，分别用FTIR、1H NMR和元素分析等技术对其结构进行表征，用广角X射线衍射和差示扫描量热法对具物理性质进行分析，并考察其在各种溶剂中的溶解性能及其对难溶性药物的增溶能力。

Starting form chitosan,amidogen protecting,cross linking,etheration,amination,amidogen release and addition reaction with CS_2,and chitosan derivative containing dithiocarbamate group was firstly prepared.

本文在课题组前期关于淀粉改性重金属捕集剂研究工作的基础上，参考国内外的相关文献，建立了以壳聚糖为主要原料制备二硫代氨基甲酸改性壳聚糖重金属捕集剂的合成工艺。

Carboxymethyl Chitosan was synthesized under conditions of basification and heat by chitosan and monochloroacetic acid.

以壳聚糖与一氯乙酸在碱性条件下通过加热制备了羧甲基壳聚糖。

In this paper, a quaternary ammonium salt of chitosan was synthesized and the factors affect on the solubility or degree of substitution of product, such as the concentration of alkali, the time of basification, the content of water in system, the time of dispersing and the method of adding epoxyproryltrimethylammonium chloride, were discussed in detail. The product was characterized by IR, DSC, TG and X-RAY diffraction. The effects of time, humidity and temperature on the gases permeability of the quaternary ammonium salt of chitosan film were researched.

本论文研究了壳聚糖季铵盐的合成反应，对碱化浓度、碱化时间、水的含量、分散时间和醚化剂的加入方式等因素对制备反应的影响进行了考察；应用红外光谱、DSC、TG以及X-射线衍射对产物进行了表征；探讨了时间、湿度和温度对壳聚糖季铵盐膜透气性的影响。

Chitosan Schiff base is the product of concentration reaction between chitosan and benzaldehyde.

壳聚糖希夫碱是壳聚糖与苯甲醛进行缩合反应的产物。

Put 3g chitosan into 50mL 1% CH3COOH solution, after dissolved completely, added 9mL H2O2 into this solution and the reaction took place at temperature of 80℃ for 3 hours. Filtrated the hydrolysate and then concentrated liquid to 20mL, neutralized liquid with 1% NaOH, added 200mL ethanol to extract hydrolyte, 3000r/min eccentricity, and then we could got all water-soluble canary yellow chitosan by vacuum-freeze drying.

称取3g壳聚糖，于50mL1%冰乙酸溶液中充分溶解，加入9mL过氧化氢，在80℃条件下水浴反应3h，水解液抽滤，滤液在60℃浓缩至20mL左右，1%NaOH中和后，加入体积比为10：1左右的无水乙醇，沉淀水溶性壳聚糖，3000r/min离心，将糖液真空冷冻干燥后可得淡黄色完全水溶性壳聚糖。

Physical stability of liposomes plays the critical roles in various stages of the applications and development of liposomes. In this study, we applied low molecular weight chitosan to modify the liposomes surface, and investigated the physical stability of liposomes, Moreover, we encapsulated cantharidin to study the effects of chitosan which cause drug leakage.

微脂粒稳定性的研究在其应用发展上占有举足轻重的影响，因此本研究利用低分子量水溶性几丁聚醣来修饰微脂粒表面，观测几丁聚醣对微脂粒物理稳定性的影响，同时也一并探讨包覆抗癌药物斑蝥素，几丁聚醣对微脂粒包覆斑蝥素的渗漏情形。

The discussion of the degradation mechanism: Chitosan is not hydrolyze in neutral soak in vitro. The mechanism of degradation of the PDLLA membrane in vivo and in vitro is similar, both represent the simple hydrolyze. The degradation of he composite membrane mainly represent the PDLLA hydrolyze of, chitosan can hydrolyze when there are acid product which is PDLLA's catabolite in vitro.

降解机理探讨：壳聚糖膜体外中性条件下不水解；聚乳酸膜体内外降解机理相似，都表现为简单水解机理；复合膜体外降解主要表现为聚乳酸的水解，壳聚糖在聚乳酸降解后产生酸性产物的条件下存在酸水解机理。

In this study, preparation of chitosan molecular imprinted resins were studied, and a simple method with a nozzle was developed, in which molecularly imprinted chitosan resin was made for hemoglobin as"print"molecule and chlorohydrin was used as crosslinker.

采用滴加成球法制备出球形壳聚糖介质，研究了三聚磷酸钠溶液浓度及空气流速对成球的影响，得到其最佳条件为：三聚磷酸钠溶液浓度3％；空气流量为1.8m〓／min，线速度为23.81m／h。

This paper reports the synthese of Schiff base of chitosan by the reaction of chitosan with citral assisted with high-intensity ultrasound.

通过壳聚糖与柠檬醛在超声波振荡下反应制备了壳聚糖缩柠檬醛席夫碱。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。