Method for multiplexed sample analysis by photoionizing secondary sputtered neutrals
First Claim
1. A method comprising:
- scanning a biological sample labelled with at least one mass tag with a primary ion beam to generate sputtered neutral species;
photoionizing the sputtered neutrals to generate photoionized species; and
detecting the photoionized species by mass spectrometry.
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Abstract
Disclosed herein is a method of generating a high resolution image of a cellular sample, the method including i) labeling a cellular sample with at least one mass tag, thereby producing a labeled sample in which a biological feature of interest is associated with the at least one mass tag, ii) scanning the sample with a continuous or near-continuous primary ion beam to generate sputtered secondary ions and sputtered neutral species, iii) photoionizing the sputtered neutrals to generate ionized neutral species, wherein the sputtered neutrals are photoionized at a site that is proximal to their source on the sample, iv) detecting the ionized neutral species by mass spectrometry, thereby obtaining spatially addressed measurements of the abundance of the at least one mass tag across an area of the sample, and v) producing an image of the sample using the measurements. A system for performing the method is also provided.
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Citations
26 Claims
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1. A method comprising:
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scanning a biological sample labelled with at least one mass tag with a primary ion beam to generate sputtered neutral species; photoionizing the sputtered neutrals to generate photoionized species; and detecting the photoionized species by mass spectrometry. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A system, comprising:
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an ion source configured to generate a primary ion beam and to scan the primary ion beam on a sample to generate neutral species from the sample; an ionization source configured to generate radiation to ionize the neutral species to generate a plurality of ions; a detector configured to receive the plurality of ions; and a computational device connected to the detector and configured so that during operation of the system, the computational device determines information about the sample based on measurements of the plurality of ions by the detector. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
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Specification