期刊
ANALYTICAL CHEMISTRY
卷 89, 期 6, 页码 3421-3429出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.6b04137
关键词
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资金
- National Science Foundation (NSF) [1310350, 1429329]
- National Institute of Justice [2015-DN-BX-K057]
- National Institute of Justice, Office of Justice Programs, U.S. Department of Justice [2015-DN-BX-K057]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1310350] Funding Source: National Science Foundation
Methods for the accomplishment of small-molecule imaging by mass spectrometry are challenged by the need for sample pretreatment steps, such as cryo-sectioning, dehydration, chemical fixation, or application of a matrix or solvent, that must be performed to obtain interpretable spatial distribution data. Furthermore, these steps along with requirements of the mass analyzer such as high vacuum, can severely limit the range of sample types that can be analyzed by this powerful method. Here, we report the development of a laser ablation-direct analysis in real time imaging mass Spectrometry approach which couples a 213 rim Nd:YAG solid state UV laser to a direct analysis in a real time-ion source and high-resolution time-of-flight mass spectrometer. This platform enables facile determination of the spatial distribution of small-molecules spanning a range of polarities in a diversity of sample types and requires no matrix, vacuum,, solvent, or complicated sample pretreatment steps. It furnishes high-resolution data, can be performed under ambient conditions on samples in their native form, and' results in little to no fragmentation of arialytes. We demonstrate its application through.determination of the spatial distribution of molecules involved in the biosynthetic cascade leading to formation of the clinically relevant alkaloids atropine and scopolamine in Datura leichhardtii seed tissue.
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