Nonresonant, femtosecond laser vaporization and electrospray post-ionization mass spectrometry as a tool for biological tissue imaging

被引:10
作者
Shi, Fengjian
Archer, Jieutonne J.
Levis, Robert J. [1 ]
机构
[1] Temple Univ, Dept Chem, 1901 N 13th St, Philadelphia, PA 19122 USA
基金
美国国家科学基金会;
关键词
Femtosecond vaporization; Ambient mass spectrometry; Mass spectrometry imaging; Tissue imaging; Statistical analysis; MULTIVARIATE STATISTICAL-ANALYSIS; ATMOSPHERIC-PRESSURE; AMBIENT CONDITIONS; LOW-ENERGY; DESORPTION IONIZATION; THERMOMETER IONS; OPEN-AIR; MATRIX; DESORPTION/IONIZATION; MACROMOLECULES;
D O I
10.1016/j.ymeth.2016.02.016
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
An ambient mass spectrometry imaging (MSI) source is demonstrated with both high spatial and mass resolution that enables measurement of the compositional heterogeneity within a biological tissue sample. The source is based on nonresonant, femtosecond laser electrospray mass spectrometry (LEMS) coupled to a quadrupole time-of-flight (QTOF) mass analyzer. No matrix deposition and minimal sample preparation is necessary for the source. The laser, translation stage, and mass spectrometer are synchronized and controlled using a customized user interface. Single or multiple laser shots may be applied to each pixel. A scanning rate of 2.0 s per pixel is achieved. Measurement of a patterned ink film indicates the potential of LEMS for ambient imaging with a lateral resolution of similar to 60 mu m. Metabolites including sugar, anthocyanins and other small metabolites were successfully mapped from plant samples without oversampling using a spot size of 60 x 70 mu m(2). Molecular identification of the detected analytes from the tissue was enabled by accurate mass measurement in conjunction with tandem mass spectrometry. Statistical analysis, non-negative matrix factorization and principle component analysis, were applied to the imaging data to extract regions with distinct and/or correlated spectral profiles. (C) 2016 Elsevier Inc. All rights reserved.
引用
收藏
页码:79 / 85
页数:7
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