Mass spectrometric analysis of DNA mixtures: Instrumental effects responsible for decreased sensitivity with increasing mass

被引：42

作者：

Chen, XY ^{[1
]}

Westphall, MS ^{[1
]}

Smith, LM ^{[1
]}

机构：

[1] Univ Wisconsin, Dept Chem, Madison, WI 53706 USA

来源：

ANALYTICAL CHEMISTRY | 2003年 / 75卷 / 21期

关键词：

D O I：

10.1021/ac030127h

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Matrix-assisted laser absorption/ionization time-of-flight mass spectrometry has demonstrated great potential to replace gel electrophoresis for DNA sequence analysis. A current limitation in this method is, however, the decreased sensitivity with increasing mass of DNA molecules. In the present study, instrumental effects on the mass analysis of DNA molecules were investigated quantitatively using an equimolar DNA mixture. It is shown that detection efficiency, detector saturation, and ion beam divergence account for the entirety of the observed falloff in signal intensity with increasing mass. Although the present study focused upon the analysis of DNA mixtures, the instrumental effects observed apply equally to other macromolecular mixtures (e.g., proteins, polymers).

引用

页码：5944 / 5952

页数：9

共 55 条

[1] Mass discrimination effects in an ion detector and other causes for shifts in polymer mass distributions measured by matrix-assisted laser desorption ionization time-of-flight mass spectrometry [J].