Chitosan was hydrolyzed by non - specific enzymes into chitooligosacchrides with some interesting functional properties and physiological activities , which have attracted many researchers in chitin science in recent years 摘要利用非专一性酶降解壳聚糖生成具有重要生理活性和功能性质的甲壳低聚糖，这已成为近年来甲壳素科学领域中的一个研究热点。
Chitin is a natural polymer that has rich resources , its research and development have been paid much attention to in the world , the dea cetylation product of which - chitosan is widely used for its distinctive physico chemical and biological characteristics 作为一种资源极其丰富的天然高分子化合物，甲壳素的研究与开发受到各国的普遍重视，其经脱乙酰化的产物- -壳聚糖因具独特的物化及生物学特性而被广泛应用。
The results show that the chitin has an excellent adsorption with microorganisms and that the microorganisms on the chitin are more effective in wastewater biochemical treatment compared with those on the activate carbon under the same condition 研究表明：甲壳素对微生物有着良好的吸附性能，保持它们高的生物活性，与活性炭为载体的微生物固定化方法在废水生化处理中的应用效果相比较，甲壳素固定化法有着更好的处理效果。
D - glucosamine hydrochloride is obtained from chitin or chitosan by hydrochloric acid hydrolysis . it is used as biochemical reagent and widely used in medicine synthesis . it can be also used as antibiotic and immunity assistant reagent and activator to guard the human body against fluvirus 氨基葡萄糖盐酸盐由甲壳素或壳聚糖经盐酸水解而成，它用作生化试剂，广泛用于药物合成，可用作抗细菌感染及免疫佐剂，是人体抗流感病毒的活化剂。
Nutripet is used for many types of disorders , such as rickets , osteomalacia , retarded growth , digestive disorder , hepatic insufficiency , dermatitis , lack of appetite etc . that derive from deficiencies of calcium , phosphorous , trace minerals and vitamins , reinforces the vitality , healthiness and improves coat condition 育犬精- f是一个给猫和狗最好的多功能矿物质辅助品，它富含多种维他命肝精粉微量矿物质甲壳素虾红素- 1 ， 3 -多醣体，酵母粉及高含量的钙与磷
Chitin possesses special character and usage after modification such as modified as sulphonation , carboxymethylation , deacetylation etc . the derivatives are widely used in the fields of chemical industry , medicine , food , cosmetics , printing and dyeing , papermaking , environmental protection and agriculture etc . chitin is the ba 甲壳素经过化学修饰和改性，如磺化羧甲基化脱乙酰化等可获得具有特殊性质和用途的甲壳质系列衍生物，在化工医药食品化妆品印染造纸环保农业等领域具有广泛用途。
The chemical components of silkworm pupa crust were analyzed , and its microstructure was characterized by using scanning electron microscope . the existing realtion of among chitin 、 protein and inorganic salt in silkworm pupa crust has been observed . the results show that the major protion of silkworm pupa chitin is in pupa crust , and it accounts for about one forth of crust weight , the out surface of pupa crust is regular polygon net vein characteristics . chitin takes honeycomb shape in chitin - protein complex and conjugated with protein . the inner space of chitin - protein complex net was filled with inorganic salts . thus the theory basis was provided for working out the process route of isolation pupa chitin 对桑蚕蛹皮的成分、结构进行了化学及扫描电镜分析，确定其含有的主要成分及含甲壳素的数量，并对其中的甲壳素、蛋白质和无机盐三者之间的存在方式进行了观察.研究结果表明，蛹体中的甲壳素与灰分主要含在蛹皮中，甲壳素占整个蛹体成分的2 . 71 % ，占蛹皮重量的25 . 5 % ，蛹皮外表面呈规整的多边形网状结构，蛹皮中蛋白质与蜂窝状的甲壳素相结合，呈层状分布，颗粒状的无机盐填充在甲壳素/蛋白质复合物构成的蜂窝状的空隙中.这为制定提取蛹甲壳素的工艺路线提供了理论依据
Abstract : methanesulfonic acid method was used to prepare five acylated chitins . except heptanoyl chitin , four of them , i . e . acetyl chitin , propionyl chitin , butyryl chitin and hexanoyl chitin , had high degree of substitution ( from 1 . 5 to 2 . 0 ) and exhibited lyotropic liquid crystalline behavior and cholesteric phase . as the length of the side chain increased the critical concentration ( w / w ) somewhat increased from 0 . 21 to 0 . 26 because the chain rigidity dropped . the critical concentration values of all the four derivatives were much higher than that of chitin ( 0 . 12 ) due to the decrease of intramolecular hydrogen bonds . the four acylated chitin can form typical banded texture after being sheared . there minimum concentrations to form banded texture of them were evidently different , varied from 0 . 25 ( for acetyl chitin ) to 0 . 37 ( for hexanoyl chitin ) . these results further indicated that liquid crystallinity decreased while the length of flexible side substituents increased 文摘:四种羧酰化甲壳素即乙酰化、丙酰化、丁酰化和己酰化甲壳素在二氯乙酸溶液中均呈现胆甾型溶致液晶相.临界浓度随侧基长度增加而略有增加，衍生物的临界浓度明显都比原甲壳素高许多，这些规律都可以用链刚性的变化来解释.四种羧酰化甲壳素在剪切时均能形成条带织构，而且能形成条带织构的最低浓度有明显差别，随侧基长度增加而提高，进一步表明侧基较长，液晶性减少
