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2016 ; 88
(10
): 5453-61
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High-Resolution Live-Cell Imaging and Analysis by Laser Desorption/Ionization
Droplet Delivery Mass Spectrometry
#MMPMID27110027
Lee JK
; Jansson ET
; Nam HG
; Zare RN
Anal Chem
2016[May]; 88
(10
): 5453-61
PMID27110027
show ga
We have developed a new ambient-ionization mass spectrometric technique named
laser desorption/ionization droplet delivery mass spectrometry (LDIDD-MS).
LDIDD-MS permits high-resolution, high-sensitivity imaging of tissue samples as
well as measurements of both single-cell apoptosis and live-cell exocytosis. A
pulsed (15 Hz) UV laser beam (266 nm) is focused on a surface covered with target
analytes to trigger their desorption and ionization. A spray of liquid droplets
is simultaneously directed onto the laser-focused surface region to capture the
ionized analytes and deliver them to a mass spectrometer. The approach of rapid
and effective capturing of molecules after laser desorption/ionization allows the
limit of detection for the amino acid lysine to be as low as 2 amol under ambient
ionization conditions. Two-dimensional maps of the desorbed/ionized species are
recorded by moving the sample on an XY translational stage. The spatial
resolution for imaging with LDIDD-MS was determined to be 2.4 ?m for an
ink-printed pattern and 3 ?m for mouse brain tissue. We applied LDIDD-MS to
single-cell analysis of apoptotic HEK cells. Differences were observed in the
profiles of fatty acids and lipids between healthy HEK cells and those undergoing
apoptosis. We observed upregulation of phosphatidylcholine (PC) with a relatively
shorter carbon chain length and downregulation of PC with a relatively longer
carbon chain length. We also applied LDIDD-MS for a real-time direct measurements
of live-cell exocytosis. The catecholamine dopamine and trace amines
(phenethylamine and tyramine) were detected from live PC12 cells without damaging
them.