Nanospray mass spectrometry with indirect conductive graphite coating
Författare
Summary, in English
An easy and cost-effective method to manufacture a robust conductive graphite coating for nanospray mass spectrometry (nESI-MS) and capillary electrophoresis (CE)-nESI-MS is described. The method involves graphite coating of a tube sleeve, into which the nESI emitter is inserted and connected to a transfer capillary, instead of coating the actual emitter. The coating, made of graphite from a pencil and epoxy glue, was stable over long periods of use (>80 h) and showed excellent resistance toward various solvents. Stable electrospray was achieved in the investigated flow range (150-900 nL min(-1)), and salbutamol, diphenhydramine, and nortriptyline (M-w: 239-263 g mol(-1)) were detected in the nanomole per liter range during continuous pumping. CE-nESI-MS analysis gave excellent signal-to-noise ratios for 100-fmol injections. The technique allows simple exchange of the nESI emitter to suit a specific flow rate, and it minimizes risk of corona discharge.
Publiceringsår
2004
Språk
Engelska
Sidor
4241-4244
Publikation/Tidskrift/Serie
Analytical Chemistry
Volym
76
Issue
14
Dokumenttyp
Artikel i tidskrift
Förlag
The American Chemical Society (ACS)
Ämne
- Analytical Chemistry
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 1520-6882