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Electrospray ionization interface to high pressure mass spectrometry and related methods

專利號(hào)
US10867781B2
公開日期
2020-12-15
申請(qǐng)人
The University of North Carolina at Chapel Hill（US NC Chapel Hill）
發(fā)明人
John Michael Ramsey; William McKay Gilliland, Jr.
IPC分類
H01J49/16; H01J49/24; H01J49/00; H01J49/04; B01L3/00
技術(shù)領(lǐng)域
mass,esi,analyzer,about,mm,inlet,chamber,ion,vacuum,trap
地域： NC NC Chapel Hill

摘要

An electrospray ionization (ESI)-mass spectrometer analysis systems include an ESI device with at least one emitter configured to electrospray ions and a mass spectrometer in fluid communication with the at least one emitter of the ESI device. The mass spectrometer includes a mass analyzer held in a vacuum chamber. The vacuum chamber is configured to have a high (background/gas) pressure of about 50 mTorr or greater during operation. During operation, the ESI device is configured to either; (a) electrospray ions into a spatial region external to the vacuum chamber and at atmospheric pressure, the spatial extent being adjacent to an inlet device attached to the vacuum chamber, the inlet device intakes the electrosprayed ions external to the vacuum chamber with the mass analyzer and discharges the ions into the vacuum chamber with the mass analyzer; or (b) electrospray ions directly into the vacuum chamber with the mass analyzer.

說明書

The term “high pressure” refers to an operational (gas) background pressure in a vacuum chamber holding a mass analyzer at or above about 50 mTorr, such as between about 50 mTorr to about 100 Torr (thus, the high pressure is in the mass analyzer). In some embodiments, the vacuum chamber pressure with a mass analyzer is between about 50 mTorr and about 10 Torr, or between about 50 mTorr to about 1 Torr or about 2 Torr, e.g., at or under 5 Torr. In some embodiments, the high pressure can be about 50 mTorr, about 60 mTorr, about 70 mTorr, about 80 mTorr, about 90 mTorr, about 100 mTorr, about 150 mTorr, about 200 mTorr, about 250 mTorr, about 300 mTorr, about 350 mTorr, about 400 mTorr, about 450 mTorr, about 500 mTorr, about 600 mTorr, about 700 mTorr, about 800 mTorr, about 900 mTorr, about 1000 mTorr, about 1500 Torr or about 2000 Torr.

FIG. 1 is a block diagram of an exemplary analysis system 100 with an electrospray ionization (ESI) device 20 (shown, by way of example only, as a fluidic microchip device) that is in cooperating alignment with a mass spectrometer 10. As is well known, mass spectrometers 10 have three fundamental components: an ion source, a mass analyzer and a detector. These components can take on different forms depending on the type of mass analyzer. As shown in FIG. 1, the ionizer comprises the ESI device 20. The ESI device 20 can have different forms/configurations including microfluidic chips, glass or quartz capillaries, pulled glass or quartz capillaries, metal capillaries and combinations of the same.

權(quán)利要求

1
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