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- A series of N-phthaloyl-chitosan with different degrees of substitution were synthesized rapidly in homogeneous solution at room temperature. 摘要通过邻苯二甲酸酐与壳聚糖在室温、均相条件下快速反应，制备一系列取代度不同的N-邻苯二甲酸化壳聚糖。
- Carboxymethyl chitosan (N,O-CMC) was prepared by reacting chitosan with chloroacetic acid and various degrees of substitution (DS) were obtained. 用氯乙酸对壳聚糖进行羧甲基改性,制备不同取代度的羧甲基壳聚糖。
- The effects of reaction temperature,reaction time and amount of NaOH on the degrees of substitution of products were discussed by orthogonal test. 通过正交实验,研究了氢氧化钠用量、反应温度和反应时间对取代度和反应效率的影响。
- ObjectiveTo investigate the biocompatibility of hydroxypropylated chitosan film with diverse degrees of substitution and the influences of its degrees of substitution to biodegradability. 目的:研究不同取代度的羟丙基壳聚糖膜的生物相容性及其取代度对生物降解性的影响。
- The results showed that the CMC value of the products was decreasing as the degree of substitution was getting higher. 结果表明,临界胶束浓度(CMC值)随着取代度的提高而降低,较高取代度的淀粉样品具有良好的表面活性。
- Degree of substitution(DS) of carboxymethylinulin was analysed by spectrophotometric titration. 用光度滴定法测定了羧甲基菊粉的取代度。
- The influence of reaction conditions on the degree of substitution of acetylated starche was investigated. 以玉米淀粉为原料,醋酸酐为酯化剂,甲烷磺酸为催化剂,制备高取代度淀粉醋酸酯。
- The results showed that the water reducing ratio of sulfonated starch is increased with the degree of substitution(DS). 以氯磺酸为磺化试剂,半干法制备了磺化淀粉,并对其用作水泥减水剂的性能进行了系统的研究。
- Spectrophotometry and potentiometric titration are common methods to detect the degree of substitution of starch phos-phate ester. 分光光度计法和电位滴定法是测定淀粉磷酸酯取代度的常用方法。
- The relationship between the technological parameters and the degree of substitution of starch phosphate and caramel color was discussed. 同时，探讨了淀粉磷酸酯的取代度和焦糖色素的色率与操作参数之间的关系。
- The effect of HPS was better than that of octadecyl acrylate.The higher the degree of substitution, the higher the salt tolerance. 用羟丙基淀粉代替原淀粉的共聚产物对提高耐盐性效果更明显，取代度越高耐盐性能越好；
- Sodium carboxymethly starches(CMS)with high degree of substitution(DS) was synthesized from starch and chloroacetic acid in this paper. 以淀粉、氯乙酸为原料,异丙醇为溶剂合成羧甲基淀粉醚(CMS)。
- With the determined parameters of synthesis, we can obtain CMS with high degree of substitution of 1.10 in one step carboxymethylation process. 在所确定的最佳反应条件下，能制备取代度为1．10的羧甲基淀粉醚。
- Who's debating with you about degrees of kinship. 谁和他计较亲疏的?
- In order to improve the serviceability of modified starch in sizing wool warp yarns, a series of starch carbamate with different degree of substitution were prepared. 摘要为提高变性淀粉浆料在毛纱上浆中的应用性能，制备了一系列具有不同取代度的氨基甲酸酯淀粉。
- All patients had similar degrees of frostbite. 所有的病人均有相似的冻伤程度。
- The ceiling depends on the cost of substitution. 天花板价依赖于替代物的成本。
- A series of phthaloyl chitosans (PCS) with different degree of substitution of amic acid were synthesized from completely deacetylated chitosan at room temperature. 室温条件下从完全脱乙酰化壳聚糖出发合成了不同酰胺酸取代度的邻苯二甲酰化壳聚糖 ,并以此为标样 ,标样的取代度由X射线光电子能谱 (XPS)确定。
- There was 5 degrees of frost last night. 昨晚气温为零下五度。
- In this paper, we used cationic starch with high degree of substitution as the flocculant, and the flocculation was satisfied when we put the starch into living sewage. 本文采用实验室研制的高取代度阳离子淀粉作为絮凝剂对造纸白水进行处理,获得良好的效果。
