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Chemically enhanced liquid chromatography/tandem mass spectrometry determination of glutamic acid in the diffusion medium of retinal cells
Author(s) -
Timperio Anna Maria,
Fagioni Marco,
Grandinetti Felice,
Zolla Lello
Publication year - 2007
Publication title -
biomedical chromatography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 65
eISSN - 1099-0801
pISSN - 0269-3879
DOI - 10.1002/bmc.856
Subject(s) - chemistry , derivatization , chromatography , dansyl chloride , glutamic acid , mass spectrometry , detection limit , tandem mass spectrometry , amino acid , biochemistry
Abstract A rapid, reproducible and highly sensitive method, based on liquid chromatography mass spectrometry, was developed for the determination of the excitatory amino acid glutamic acid released in the diffusion medium of control, ischemic and mutant cells from retinas. Signal intensity of glutamic acid was enhanced by dansyl chloride derivatization giving rise to a detection limit in the order of pmol/mL. Further, in HPLC‐ESI‐MS detection an MS‐friendly dansyl group to glutamic acid enhanced both ionization efficiency in the ESI source and collision‐activated dissociation in the collision cell. The sample processing procedure included liquid–liquid extraction, derivatization with dansyl chloride and a final cation‐exchange extraction to generate clean extracts for LC/MS/MS analysis. This approach has been validated as sensitive, linear (20–300 ng/mL), accurate and precise for the differential quantification of glutamic acid in the diffusion medium of retina cells. This is the first report of using chemical derivatization to enhance MS/MS detection of the glutamic acid released in the diffusion medium of wild‐type and mutant retina cells, under ischemic conditions. Copyright © 2007 John Wiley & Sons, Ltd.