methoxyl

Amino 4 methoxyl acetylaniline was synthesized acetylization ofp-methoxylaniline with acetic acid and acetic anhydride, then nitration and reduction.

以对甲氧基苯胺为原料,用冰醋酸和醋酸酐作乙酰化剂,经乙酰化 、 浓硝酸硝化、铁粉还原合成了3-氨基-4-甲氧基乙酰苯胺.

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The results indicate that compared with reed lignin, residual lignin in reed kraft pulp had higher contents of oxygen and phenolic and alcoholic hydroxyl groups, lower contents of methoxyl group, residual carbohydrates and total aldehydes after alkaline nitrobenzene oxidation.

研究发现，苇浆残余木素比起芦苇木素具有较高的氢含量和较低的氧含量；较低的甲氧基含量和较高的酚羟基和醇羟基含量；

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The C_9 unit empirical formula of the product of F was: C_9H_ ( 6.72) O_ ( 3.07)( OCH_3) 1.52, with 0.43 Ph-OH and 1.52 methoxyl group in each C_9 unit.

甲酸酸解后产物的C9单元经验式为：C9H（6.72）O（3.07）（OCH3）（1.52），每个C9单元含有0.43个酚羟基，1.52个甲氧基；

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As a main component of black liquid from papermaking industries adopting alkaline pulping, the high-efficient utilization of alkali lignin focuses on how to improve the chemical reactivity caused by its plentiful methoxyl and few aliphatic hydroxyls.

碱木质素是造纸工业碱法制浆黑液的主要成分，其甲氧基含量较高，醇羟基含量较低，导致化学反应活性低，因此提高其反应活性成为碱木质素高效利用的关键。

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~ 1H-NMR and UV analysis show that, after reaction, benzene ring in the structure unit of the alkali lignin is steady, carboxyl, carbonyl and methoxyl all have reduced in different extent, while aliphatic and phenol hydroxyl have increased.

~1H-NMR和UV光谱分析显示反应后碱木质素的结构单元中苯环结构稳定，羰基、羧基、甲氧基有所减少，醇羟基和酚羟基的量增加了。

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There are three steps in MTO reaction: formation of methoxyl groups on the surface of SAPO 34, formation of the first C-C bond and formation of C 3 and C 4.The 12-reaction Kinetics model proposed by Bos et al bear representative signification.

MTO反应机理可以分成三步：在分子筛表面生成甲氧基、形成第一个C-C键、生成C3、C4。反应动力学较有代表性的是Bos等[1]提出的涉及积炭反应的12反应模型。

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While the methoxyl has reduced from 13.85% to 10.14%.

甲氧基含量由13.85%减少为10.14%；

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By GC-MS analysis it is observed that ketones were transformed into the corresponding alkyl alcohol, methoxyl content was relatively high in the phenolic, and a small amount of cyclohexene is formed.

通过GC-MS分析发现，酮类转化为相应的烷基取代醇，酚类中甲氧基含量相对较高，有少量环己烯生成。

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This paper describes the advance, preparation and application of Low-methoxyl pectin in detail.

作者就低酯果胶的研究进展 、 制备方法以及应用做一综述.

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The formation of gel would be due to low methoxyl pectin associated with calcium, which absorbed into dialysis tube when dialysis against running taping water. This deduction agrees with that a high amount of calcium and ash content were detected in these samples.

这主要是由于低酯果胶在自来水透析过程中吸收钙离子形成了凝胶，这一推论与组分中Ca离子含量及灰分含量较高的结果一致。

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Objective To investigate the optimal extraction technology of low methoxyl pectin from shaddock peel.

目的研究从柚皮中提取低甲氧基果胶的最佳工艺条件.

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A study on the gelling properties of sodium alginate-high methoxyl pectin systems and the effect of pH, gelling temperature and time on them were conducted.

研究了海藻酸钠高甲氧基果胶复合体系的凝胶特性及pH值、凝胶温度和时间对其凝胶特性的影响。

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