Biases in ion transmission through an electrospray ionization-mass spectrometry capillary inlet |
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Authors: | Jason S Page Ioan Marginean Erin S Baker Ryan T Kelly Keqi Tang Richard D Smith |
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Institution: | 1. Biological Sciences Division, Pacific Northwest National Laboratory, Richland, Washington, USA
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Abstract: | A heated capillary inlet for an electrospray ionization mass spectrometry (ESI-MS) interface was compared with shorter versions
of the inlet to determine the effects on transmission and ionization efficiencies for low-flow (nano) electrosprays. Five
different inlet lengths were studied, ranging from 6.4 to 1.3 cm. As expected, the electrospray current transmission efficiency
increased with decreasing capillary length due to reduced losses to the inside walls of the capillary. This increase in transmission
efficiency with shorter inlets was coupled with reduced desolvation of electrosprayed droplets. Surprisingly, as the inlet
length was decreased, some analytes showed little or no increase in sensitivity, while others showed as much as a 15-fold
gain. The variation was shown to be at least partially correlated with analyte mobilities, with the largest gains observed
for higher mobility species, but also affected by solution conductivity, flow rate, and inlet temperature. Strategies for
maximizing sensitivity while minimizing biases in ion transmission through the heated capillary interface are proposed. |
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