烷类

The results indicated that the extraction rate by acetone is the highest,followed that by alcohol and methanol in turn.

结合化学反应，初步认为苦荞麦粉含有黄酮醇类化合物，苦荞麦壳含有黄酮化合物，而甜荞麦壳和甜荞麦粉中可能含有黄烷酮化合物。

Oil in the redeployment of high-octane fuel components, blending the best choice programs, such as redeployment isooctane, cumene, alkyl benzene, methyl tert-butyl ether, alcohol burning Materials.

在油品中调入高辛烷值燃料的组分，选择最佳调合方案，如调入异辛烷、异丙苯、烷基苯、甲基叔丁基醚、醇类燃料等。

Direct enantiomeric separation of racemic mixtures of 13 β-amino alcohols and β-hydroxy sulfides was achieved by HPLC using Chiralcel OD, Chiralcel OJ and Chiralpak AD as chiral stationary phases and hexane/2-propanol mixture as eluent. These racemates were completely separated into enantiomers at least on one of these stationary phases.

在以正己烷-异丙醇为移动相的体系中，用ChiralcelOD，ChiralcelOJ及ChiralpakAD作为手性固定相对13种β-氨基醇及β-羟基硫醚类化合物对映体进行HPLC手性拆分，这些化合物至少能在一支柱上得到基线级分离。

It can be seen from Table 1 that the residual recalcitrant organics consisted of alcohols (36.68%a),phenols (6.88%),ketonnes,quinines, parafins, nitrogenous and sulfur compounds.

从表1中可见，残余的不易分解的有机物包括了酒精36.68%），长链烷醇混合物(6.88%，酮类、奎宁，石蜡，含氮和硫化合物。

Their extraction properties have been studied by metal picrates liquid-liquid extraction and the results show:By using three thio-heterocyclic compounds, twelve novel derivatives of thioalkoxycalix[4]arenes on the lower rim have been synthesized and structurally characterized by 1H NMR、13C NMR、IR and MS.

本文采用三种巯基杂环化合物对杯芳烃下沿进行修饰，得到了下沿含有杂环硫烷氧基的杯芳烃系类系列衍生物，并利用~1H NMR、~(13)C NMR、IR和MS对所合成的十二个未见文献报道的新化合物进行了结构表征。

X 6.36(3)? is formed.Liquid-liquid extraction experiments, between twelve heterocyclic thioalkoxycalix[4]arene on the lower rim, fifteen heterocyclic thioacetamidecalix[4]arene on the upper rim and Na~+、K~+、Cs~+、Mg~(2+)、Cu~(2+)、Co~(2+)、Cd~(2+)、Ni~(2+)、Pb~(2+)、Hg~(2+) and Ag~+ picrates, have been carried out and their results are compared.

分别将十二个下沿含有杂环硫烷氧基杯芳烃衍生物和十五个上沿含有杂环硫乙酰胺基的杯芳烃衍生物与Na~+、K~+、Cs~+、Mg~(2+)、Cu~(2+)、Co~(2+)、Cd~(2+)、Ni~(2+)、Pb~(2+)、Hg~(2+)和Ag~+的十一种苦味酸盐进行了离子萃取实验，并对两类衍生物与不用金属离子的萃取能力进行了分析和比较。

And the caffeine in tea flavanols can increase the special type of compound in the digestive tract motility, and thus help to digest food.

茶叶中的咖啡碱和黄烷醇类化合特可以增加消化道的蠕动，因而就有助于食物的消化。

The breakdown of amino acids which occurs as the flavanols are oxidized gives rise to aldehydes in black tea aroma.

黄烷醇氧化时发生的氨基酸降解，产生了红茶香气中的醛类物质。

The breakdown of amino acids which occurs as the flavanols are oxidized gives rise to aldehydes in black tea aroma.

黄烷醇氧化时发生的氨基酸降解，产生了红茶香气中的醛类物质。由原路返回；走回头路

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。