Journal
ANALYTICAL CHEMISTRY
Volume 84, Issue 17, Pages 7422-7430Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ac301332k
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Funding
- Swiss National Science Foundation [200020-127142]
- Swiss National Science Foundation (SNF) [200020_127142] Funding Source: Swiss National Science Foundation (SNF)
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An electrostatic-spray ionization (ESTASI) method has been used for mass spectrometry (MS) analysis of samples deposited in or on an insulating substrate. The ionization is induced by a capacitive coupling between an electrode and the sample. In practice, a metallic electrode is placed close to but not in direct contact with the sample. Upon application of a high voltage pulse to the electrode, an electrostatic charging of the sample occurs leading to a bipolar spray pulse. When the voltage is positive, the bipolar spray pulse consists first of cations and then of anions. This method has been applied to a wide range of geometries to emit ions from samples in a silica capillary, in a disposable pipet tip, in a polymer microchannel, or from samples deposited as droplets on a polymer plate. Fractions from capillary electrophoresis were collected on a polymer plate for ESTASI MS analysis.
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