基峰

BSTFA衍生物子离子为m/z58（基峰）、m/z73、m/z290、m/z348（分子离子峰）

Fragment ion of BSTFA derivatives was m / z 58 ( base peak ion ), m / z 73 , m / z 290 and m / z 348 ( molecular ion ) .

基峰m/z191可进一步裂解，通过多种途径形成m/z147、132、91相应碎片；

The base peak m / z 191 may further be cleaved to form fragments m / z 147 , 132 , 91 ;

结果表明，分子离子的稳定性、基峰的生成方式以及碎片离子的多少主要取决于取代基R的性质。

The stability of molecular ion , the mode of formation of the base peak and the number of fragment ions depend mainly upon the property of substituent group .

基峰m/z191是由M~+通过邻位效应失去HN（CH3）2中性分子形成的；

The base peak at m / z 191 is formed with the loss of a neutral molecule via the ortho effect ;

本文报道了五种2芳基3H吲哚3酮（15）的电子轰击质谱.发现其主要质谱特征为较强的分子离于峰M和MCO基峰.对该类化合物的质谱裂解机理进行了探讨。

The electron impact mass spectra of five 2-aryl-3H-indol-3-ones ( 1-5 ) were reported . The most characteristic mass spectra behaviors were the clear molecular ion peaks , as well as the M-CO base peaks . A possible fragmentation mechanism for these compounds was proposed .

对3个峰分别离子扫描：保留时间为22.55min的峰对应的基峰m/z为184，经分析该化合物为DBT；

Analysing result of the three peaks by scanning with chromatography of ions is : peak of 22.55 min retention time relate to m / z equals 184 , the chemical compound is DBT ;

FAB负离子质谱，获得[M-n]~-典型离子簇，[M-1]~-作为最强离子是每一个样品的基峰。

In FAB negative ion mass spectra the typical ( M - n ) - cluster ion is observed and the ( M - 1 ) - ion shown as its highest intensity is the base peak for each of the samples .

EIMS主要显示m／e209和181碎片，且m／e181常为基峰。

While EIMS mainly showed peaks of m / e209 and 181 , usually with m / e 181 as base peak .

保留时间为20.14min的峰的对应基峰m/z为141，经分析该化合物为2-羟基联苯（2-HBP）。

Peak of 20.14 min retention time relate to m / z equals 141 , the chemical compound is 2-hydroxybiphenyl ( 2-HBP ) by analysis .

7种大环酮的EI电离质谱图有相似的谱态和一些相同的碎片离子，烯丙基离子（m／z41）和烯羰基离子（m／z55）是基峰。

Electron impact mass-spectra of 7 macrocyclic ketones have similar appearance and several same fragment ions , allylic ion ( m / z 41 ) and allylic carbonyl ion ( m / z 55 ) are base peaks .

大部分的基峰都来源于氮原子的β裂分。

Most base peaks are formed from β cleavage of nitrogen atom .

烷基取代苯的质谱基峰质荷比的特征规律

A characteristic rule of rate of mass to charge for the base peak about alkyl benzenes

醋酸酐衍生物子离子为m/z58（基峰）、m/z246（分子离子峰）；

Fragment ion of acetic acid anhydride derivatives was m / z 58 ( base peak ion ), m / z 246 ( molecular ion ) .

2-烷基噻吩和2,5-（二烷基）噻吩质谱基峰质荷比的特征规律

The characteristic rules of rates of mass to charge for base peak about 2 - ( alkyl group ) thiophene and 2,5 - ( two alkyl groups ) thiophene

根据高分辨质谱及联动扫描质谱揭示了该类化合物的质谱裂解途径，结果表明该类化合物出现较强的分子离子峰及特征的基峰[ArNCO]~+。

Their mass spectral fragmentations were proposed on the basis of high resolution mass spectrometry and B / E linked scan spectra . The results show that the molecular ion is relatively strong , and the characteristic peak [ ArNCO ] ~ + is a base peak .

红外光谱图存在酰胺基吸收峰，说明可溶性淀粉与N，N′&亚甲基双丙烯酰胺发生了交联反应。

The adsorption peaks of amide group existed in infrared spectrogram proved that the soluble starch had crosslinked with N , N ' - methylene-bis-acrylamide .

IR上1050～1300cm~（-1）区域酯基吸收峰位置的预测

Numerical Estimation of Peak Positions for the 1050 ~ 1300cm ~ ( - 1 ) Absorption Band of an Ester Group in Infrared Spectra

我们在Fe2+-H2O2-KI体系中检测到了明显的自由基吸收峰，并发现该体系也具有部分的抗菌作用。

We detected obvious absorption peak of free radical in the Fe2 + - H2O2 - KI system which had efficiency on antibacterial action .

中华眼镜蛇细胞膜毒素CT-Ⅰ和CT-Ⅱ的400MHz~1H核磁共振比较研究：芳香残基共振峰的识别和活动性

400-mhz ~ 1h NMR comparative studies of cytotoxin ct - ⅰ and ct - ⅱ from Chinese cobra ( naja Naja atra ): of resonances and mobility of aromatic residues

将激光光解与SO~-的氧化对比，确认了到C（70）富勒醇阳离子自由基的吸收峰。

The fullerol radical canon of C_ ( 70 ) is observed for the first time by laser photolysis or oxidation of sulfate radical anion SO ~ - in aqueous solution .

而DMEM高糖培养基224nm吸收峰在培养细胞生长过程中位移至221nm附近，278nm吸收峰基本没有位移。

While during growing course of cultivated cells , one of the absorption peaks of DMEM culture medium shifted from 224 nm to one near 221 nm , and the absorption peak 278 nm almost had no shift .

芳香胺含酸性取代基则使峰序滞后。

The acidic groups of aromatic amines make the peaks to elute later .

盐酸胍的加入使Trp残基的荧光发射峰位明显红移，表明位于AaH分子较疏水环境的Trp残基相对外露。

The red - shifted emission band of Aa H after adding guanidine - HCl showed that Trp residues exposed in polar solvents .

有O-乙酰基的特征吸收峰，说明在某些糖残基上可能有乙酰基团。

It seemed that some sugar residues had o-acetyl group .

但在相同的H2O2浓度下，Fe2+-H2O2体系（产生羟自由基的典型体系）却有明显的自由基吸收峰。

In the same H2O2 concentration , however , free radical was detected in the ferrous ion-hydrogen peroxide system ( a typical system generating hydroxy radical ) .