hydroxymethyl

It was proved that 70% of formaldehyde molecule transformed into hydroxymethyl ureas and another 25% of formaldehyde molecule formed methylene-ether bond in the initial alkaline reaction stage.

结果表明：在初始碱性阶段有70%的甲醛分子转化成了羟甲基脲，25%的甲醛分子转化成了亚甲基醚键。

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The chloromethylation reaction consists of electrophilic substitution reaction and nucleophilic substitution reaction, the nucleophilic substitution is the rate-controlling step and the hydroxymethyl cation (+ CH20H) is the really effective electrophile.

氯甲基化反应由亲电取代反应和亲核取代反应组成，亲核取代反应是反应的速率控制步骤，羟甲基碳正离子（+CH2OH）；是真正有效的亲电试剂。

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A HPLC method for the determination of dobutamine hydrochloride glucose injection and the related substance of glucose& 5 hydroxymethyl furfuraldehyde was established.

建立了盐酸多巴酚丁胺葡萄糖注射液以及葡萄糖降解产物5-羟甲基糠醛含量的HPLC测定法。

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The zirconia-coated capillary exhibits the switchable EOF whose direction and magnitude are strongly dependent on the properties of nonaqueous solvents composition, their apparent pHs ( pH), and the electrolytes used ( hydroxymethyl aminomethane and ammonium acetate).

二氧化锆涂层毛细管表现出双向电渗流，其方向和大小都和体系的性质有关，如pH~，溶剂组成，电解质（Tris和醋酸铵）。

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OBJECTIVE: RP HPLC method for the determination of content of 5 hydroxymethyl furfuraldehyde ( 5 HMF) in mitoxantrone dextrose injections is reported.

目的：采用HPLC测定盐酸米托蒽醌葡萄糖注射液中5羟甲基糠醛的含量。

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Methods: Chloroform being solvent, under bath heat, 4 hydroxymethyl caged bicyclic phosphate acylated with pentanoyl chloride and hexanoyl chloride dividedly.

方法：用氯仿作溶剂，在浴温条件下，4羟甲基笼状双环磷酸酯分别与戊酰氯、己酰氯发生酰化反应。

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Hydroxymethyl furfural ( 5-HMF ) is an index compound for beer stalking.

由于 5- 羟甲基糠 醛 对啤酒老化所具有的指示作用.

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The principle and test conditions of the determination of hydroxymethyl index for phenolic resin by infrared spectroscopy were introduced.

介绍用红外光谱法测定酚醛树脂羟甲基指数的原理和实验条件。

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Extraction in dioxane indicated that the hydroxymethyl lignin took part in the solidification reaction of novolac.

二氧六环抽提结果表明，羟甲基化木质素参与了固化交联反应。

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The calibration curves of dobutamine hydrochloride and 5 hydroxymethyl furfuraldehyde were linear in range of 50~ 200 μ g/ ml and 0.25~ 3.5 μ g/ ml, respectively.

盐酸多巴酚丁胺和5-羟甲基糠醛分别在50～200μg/ml和0.25～3.5μg/ml范围内线性关系良好。

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