乙糖

Thus a better method of preparing free 2-OH glycoside with less reaction steps was obtained.

对于2，3-二-O-乙酰保护基的糖苷，2-O-去乙酰化的效果更好。

Ethylene glycol glycosides,useful as humectant in cosmetics,were prepared by phosphoric acid-catalyzed acetalization of glucose with ethylene glycol.

在磷酸催化下，由葡萄糖和乙二醇经缩醛化反应制备了乙二醇葡糖苷，可用作化妆品保湿剂。

Themain contents of this dissertation are as follows:(1) The quality analytiedal results of chitosan are as follows: water for 15.205%;degree of deacetylation 92.671%; the weight average relative molecular weight ofchitosan 195900; the viscosity average relative molecular weight of chitosan 194100;and the decomposing temperature 298℃. The infrared ray IR spectra of chitosanshows that the feature-absorbing band of chitosan amido was 1601cm~(-1), that ofβ-indican bond was 986cm~(-1). The results of the X-ray diffraction of chitosan indicatesthat its degree of deacetylation and degree of crystal are both big.

本文的主要内容如下：(1)对壳聚糖的质量进行分析，其水份为15.205％，脱乙酰度为92.671％，重均分子量为195900，黏均分子量为194100，分解温度为298℃，壳聚糖的红外光谱表明，壳聚糖—NH_2的特征吸收峰为1601cm~(-1)，β-糖苷键的特征吸收峰为986cm~(-1)，壳聚糖的X-衍射图表明壳聚糖原料的脱乙酰度和结晶度均较大。

Phosphorylated chitosan (phosphorylate-modified chitosan,P-CTS) was synthesized by the reaction of monosodium orthophosphate with urea in the presence of HAc.

壳聚糖(chitosan，CTS)是由β(1~4)键合的D-葡糖胺残基和数目不同排列无规的N-乙酰基葡糖胺残基组成的线性多糖，是生物界中大量存在的唯一的一种碱性多糖。

Part 2. The peracetylated chito-oligosaccharides were obtained by acetolysis of chitin.

Part 2。通过几丁质的乙酰解得到全乙酰化的几丁寡糖。

Transparent qualitative acid is sticky polysaccharide of sex of acidity macromolecule a gleam of, by acetyl of aldehydic acid of D- Pu candy and N- the disaccharide unit of amino Pu candy relapses to join alternately and become.

梗概： 透明质酸(hyaluronan，HA)为酸性大分子一线性黏多糖，由D-葡糖醛酸和N-乙酰氨基葡糖的双糖单位反复交替连接而成。

Chitooligosaccharides was obtained from crustaceous materials, such as shrimp and crab by deacetylation and degradation, and it had a wide range of applications in medicine.

壳寡糖是由虾蟹壳等甲壳类物质通过脱乙酰基与降解而得到的寡糖，它在医药领域有广泛的应用。

To provide a non-toxic, zero-residue and effective approach to prevent the parasitical Ascaris suum, the effect of kaempferol-3-a-L-(4-O-acetyl)-rhamnose-7-a-L-rhamnoside,extracted from Cyrtomium yunnanense, on the the animals infected with A. suum was studied.

为猪蛔虫病的防治提供无毒、无残留，对人体无害的高效防治方法，利用云南贯众分离得到的化合物山奈酚－3-a-L-（4-O-乙酰基）鼠李糖基－7-a-L-鼠李糖苷作为试验用药，对感染猪蛔虫的动物进行了药效试验研究。

The optimal derivatization condition is reducting reaction 2.5h at 50℃followed by acetylating 2.5h at 90℃.

总结出了单糖衍生化最佳的反应条件为还原温度50℃、还原时间2.5h；乙酰化温度90℃、乙酰化时间2.5h。

Low molecular weight chitosan is prepared from breakdown of glycosidic bond of chitosan.

甲壳素是N-乙酰葡萄糖胺的聚合物，甲壳素脱乙酰后为壳聚糖，壳聚糖糖苷键断裂降解为低分子量壳聚糖。

What would he tell Judith and the children?

他将怎样告诉朱迪丝和孩子们呢？

I this is at that time, the opinion with peacockish true girl is full of in a heart.

这就是当时的我，一个心中布满虚荣的女孩子真实的想法。