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Attomole-sensitivity electrospray source for large-molecule mass spectrometry.

G A Valaskovic·N L Kelleher·D P Little·D J Aaserud·F W McLafferty
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Abstract

Full mass spectra of high resolving power are obtained from 0.2 nL sample volumes of large (> 10 kDa) nucleotides and proteins using a new electrospray ionization (ESI) system combined with Fourier transform mass spectrometry. The ESI needles are fabricated by laser-heated pulling of fused-silica tubing (5-20 microns i.d.), followed by chemical etching and surface metalization. Total analyte loaded at the instrument of 8.6 fmol and 216 amol produces signal-to-noise ratios of 400:1 and 60:1, respectively, and resolving power of > 10(5) for full mass spectra, while the total amount of material consumed is approximately 150 and 10 amol, respectively.

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G A Valaskovic, N L Kelleher, D P Little, D J Aaserud, F W McLafferty. 1995-10-15. Attomole-sensitivity electrospray source for large-molecule mass spectrometry.. https://doi.org/10.1021/ac00116a030

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