Insects polysaccharide from insect crust are a natural macromolecular polymers that remove behind the acetyl group getting usually that paries draw, which are currently found only bring positive charge of the animals cellulose in the natural world- containing amino polysaccharide of high-molecular compound.

昆蟲(chóng)多糖是從昆蟲(chóng)體壁提取的甲殼素脫去乙酰基后得到的一種天然高分子聚合物三级经典在线视频网站，也是目前發(fā)現(xiàn)的自然界中唯一帶正電荷的可食性動(dòng)物纖維素——含氨基多糖的高分子化合物真实破苞痛痛痛视频。

In this paper the study on optimizing the esterification of cellulose and some character of CAB(the degree of substitution of cellulose, solubility, the thermal properties and molecular weight) was discussed. The mechanism of the esterification of cellulose in butyric acid/ acetic acid/ butyric anhydride which comprises the creation of the acetic butyric anhydride, acetyl cation and butyryl cation was investigated by the study of the effect of the content of the organic acid and anhydride on the degree of acetyl and butyryl substitution of cellulose.

最后本文根據(jù)纖維素在丁酸/乙酸/丁酸酐中的酯化反應(yīng)中有機(jī)酸以及酸酐的添加量對(duì)最后產(chǎn)物纖維素醋酸丁酸酯中乙酯或者丁酯取代度的影響，提出纖維素在丁酸/乙酸/丁酸酐中的酯化反應(yīng)經(jīng)歷一個(gè)混和酸酐以及乙酰碳正離子国产自慰喷水在线、丁酰碳正離子的生成過(guò)程99re9精品视频。

Cellulose acetate butyrate with high or low degree of butyryl substitution was synthesized in heterogeneous system(butyric acid/ acetic acid/ butyric anhydride/ sulfuric acid) using the "free solvent" method. The effect of activation time, esterification time, the molecular weight of cellulose and the content of the organic acid or anhydride on the degree of acetyl and butyryl substitution of cellulose was discussed.

在非均相體系中進(jìn)行酯化反應(yīng)，采用&反應(yīng)性溶劑&久久精品国内，以硫酸作為催化劑合成出從高丁酯含量到低丁酯含量的纖維素醋酸丁酸酯黄色小视频1024你懂的，研究有機(jī)酸以及酸酐的添加量、活化時(shí)間国产麻豆男女约爱网站、酯化反應(yīng)時(shí)間以及原料纖維素的分子量對(duì)酯化產(chǎn)物纖維素醋酸丁酸酯的影響日韩精品牲交一区。

We ever reported cellulose is in propyl of Xi of ionic liquid 1-- chloric salt of Zun of 3- methylic Mi (the homogeneous phase acetyl in Am ImC L) converts reaction, falling without activator condition, one pace gets the CA of different DS, get acetone but the CDA[12] of dissolve.

我們?cè)鴪?bào)道了纖維素在離子液體1-烯丙基-3-甲基咪唑氯鹽中的均相乙酰化反應(yīng)疯狂伦交成人网站视频，在無(wú)催化劑條件下97人人模人人爽人人喊免，一步得到不同DS的CA，并得到丙酮可溶的CDA[12]精品剧情日韩欧美在线观看网站免费。

The shell polyose is glucosamine is composed by the majority of D- glucosamine and few N- the acetyl - D-, gets up the linear chain polysaccharide by β-(1,4) sugar glucoside keying, its structure is similar to the cellulose.

殼聚糖是由大部分D-氨基葡萄糖和少量的N-乙酰-D-氨基葡萄糖組成勉费黄色一级啪啪视频，以β-(1，4)糖苷鍵連接起來(lái)的直鏈多糖91人妻中文字幕无码专区，其結(jié)構(gòu)類似于纖維素又黄又爽一级A片。

The shell polyose is glucosamine is composed by the majority of D- glucosamine and few N- the acetyl - D-, gets up the linear chain polysaccharide by β-(1,4) sugar glucoside keying, its structure is similar to the cellulose.

殼聚糖是由大部分D-氨基葡萄糖和少量的N-乙酰-D-氨基葡萄糖組成，以β-(1国产精品久久久久国产这里有精品，4)糖苷鍵毗連起來(lái)的直鏈多糖插入女生阴道视频，其結(jié)構(gòu)類似于纖維素强奷迷奷无码片。