Mass spectra (MS) of cholesterol esters and halides were obtained by means of Electron Impact (EI), Field Desorption (FD) and Chemical Ionization (CI).
研究了胆甾醇酯类和胆甾醇卤代物的电子轰击电离（EI）、场解吸电离（FD）、化学电离（CI）的质谱。
The analysis results of naphthenic acids were obtained by the use of MS and EI techniques.
通过电子轰击(ei)质谱(MS)分析得到的环烷酸。
Mass spectrometry, in particular, GC-MS (EI or CI mode) for single-sugar analysis already has several decades of history.
质谱，尤其是GC - MS (EI或CI方式)用于单糖分析已有几十年历史。
Derivatives are the same with target product through IR, 1HNMR, 13CNMR and EI-MS.
通过红外吸收谱图、核磁谱图和质谱分析与目标产物一致。
The optimal catalyst was HBr with a highest selectivity and yield of 95.67%. The structure of emodin synthesized was characterized by 1H-NMR and EI-MS.
结果与结论3种方法中，采用氢溴酸作催化剂的反应选择性最高，收率达到95.67%，产物结构经1H-NMR和EI-MS确证。
In this paper, EI and FAB-MS of tri and tetra-O-acetyl C-glucosides and C-galactosides were reported. Some characteristic fragmentation patterns of O-acetyl C-glycosides were discussed.
本文报道了四—O—乙酰基和三—O—乙酰基匍萄糖及半乳糖碳苷的电子轰击质谱和快原子轰击质谱，总结出一些乙酰基碳苷特有的裂解规律。
In this paper, EI and FAB-MS of tri and tetra-O-acetyl C-glucosides and C-galactosides were reported. Some characteristic fragmentation patterns of O-acetyl C-glycosides were discussed.
本文报道了四—O—乙酰基和三—O—乙酰基匍萄糖及半乳糖碳苷的电子轰击质谱和快原子轰击质谱，总结出一些乙酰基碳苷特有的裂解规律。
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