Document Detail

Ascorbic acid assays of individual neurons and neuronal tissues using capillary electrophoresis with laser-induced fluorescence detection.
MedLine Citation:
PMID:  12433096     Owner:  NLM     Status:  MEDLINE    
Ascorbic acid is an important cellular metabolite involved in many biochemical pathways. A method to quantitate ascorbic acid and dehydroascorbic acid in individual neurons and neuronal tissues is described with detection limits of 320 pM (430 zmol). The method uses microvial sampling, derivatization with 4,5-dimethyl-1,2-phenylenediamine, capillary electrophoresis separation, and laser-induced fluorescence detection and quantifies the ascorbic acid and dehydroascorbic acid levels with less than a 15-min total analysis time including sample preparation and derivatization. Ascorbic acid and dehydroascorbic acid levels are measured using functionally characterized and identified neurons of Aplysia californica, Pleurobranchaea californica, and Lymnaea stagnalis -three well-recognized models in cellular and system neuroscience. Multiple assays of a particular identified neuron (e.g., metacerebral cells from Aplysia) show a high level of reproducibility, while endogenous intracellular concentrations of ascorbate are neuron-specific. Ascorbic acid concentrations in the neurons studied range from 0.19 to 6.2 mM for Aplysia and 0.12 to 0.22 mM for Lymnaea. In contrast, concentrations of ascorbic acid observed in heterogeneous tissues such as ganglia (with connective tissues, glia, blood vessels, neuropile, and areas with intercellular spaces), 4-190 microM, are significantly lower than the single-cell values.
Won-Suk Kim; Robin L Dahlgren; Leonid L Moroz; Jonathan V Sweedler
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Analytical chemistry     Volume:  74     ISSN:  0003-2700     ISO Abbreviation:  Anal. Chem.     Publication Date:  2002 Nov 
Date Detail:
Created Date:  2002-11-15     Completed Date:  2002-12-31     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0370536     Medline TA:  Anal Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  5614-20     Citation Subset:  IM    
Department of Chemistry and the Beckman Institute, University of Illinois, Urbana 61801, USA.
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MeSH Terms
Aplysia / chemistry,  cytology
Ascorbic Acid / analysis*,  metabolism
Dehydroascorbic Acid / analysis,  metabolism
Electrophoresis, Capillary / methods
Neurons / chemistry*
Spectrometry, Fluorescence / methods
Grant Support
Reg. No./Substance:
490-83-5/Dehydroascorbic Acid; 50-81-7/Ascorbic Acid

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