Picoelectrospray ionization mass spectrometry using narrow-bore chemically etched emitters.
Picoelectrospray ionization mass spectrometry using narrow-bore chemically etched emitters.
复制标题
使用窄孔化学蚀刻的发射器,picoelectrospray电离质谱法。
DOI:
10.1007/s13361-013-0749-z
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发表时间:
2014-01
影响因子:
3.2
通讯作者:
Kelly, Ryan T.
中科院分区:
文献类型:
--
作者:
Marginean, Ioan;Tang, Keqi;Smith, Richard D.;Kelly, Ryan T.
Electrospray ionization mass spectrometry (ESI-MS) at flow rates below ~10 nL/min has been only sporadically explored due to difficulty in reproducibly fabricating emitters that can operate at lower flow rates. Here we demonstrate narrow orifice chemically etched emitters for stable electrospray at flow rates as low as 400 pL/min. Depending on the analyte concentration, we observe two types of MS signal response as a function of flow rate. At low concentrations, an optimum flow rate is observed slightly above 1 nL/min, while the signal decreases monotonically with decreasing flow rates at higher concentrations. For example, consumption of 500 zmol of sample yielded signal-to-noise ratios ~10 for some peptides. In spite of lower MS signal, the ion utilization efficiency increases exponentially with decreasing flow rate in all cases. Significant variations in ionization efficiency were observed within this flow rate range for an equimolar mixture of peptides, indicating that ionization efficiency is an analyte-dependent characteristic for the present experimental conditions. Mass-limited samples benefit strongly from the use of low flow rates and avoiding unnecessary sample dilution. These findings have important implications for the analysis of trace biological samples.
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影响因子:
7.4
作者:
Mellors, J. Scott;Jorabchi, Kaveh;Smith, Lloyd M.;Ramsey, J. Michael
通讯作者:
Ramsey, J. Michael
影响因子:
7.4
作者:
Bahr, U;Pfenninger, A;Stahl, B
通讯作者:
Stahl, B
影响因子:
7.4
作者:
Chang, YZ;Chen, YR;Her, GR
通讯作者:
Her, GR
影响因子:
2.9
作者:
Chen, YR;Tseng, MC;Her, GR
通讯作者:
Her, GR
影响因子:
2
作者:
Ishihama, Y;Katayama, H;Oda, Y
通讯作者:
Oda, Y