Wang and Hackett have recently proposed (Anal. Chem. 1998, 70, 205-212) a new electrospray interface described as a "concentric cylindrical capacitor". Excellent spectra were obtained, especially in the negative ion mode, with lipid A, a 15-mer oligonucleotide, and a series of proteins. We find that similar results can be obtained merely by ensuring a direct electrical contact between the analyte inside a fused-silica capillary and the high-voltage supply. No capacitor effect need be invoked.
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