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A high-throughput screening assay of ascorbate in brain samples.

Authors
Belikova-NA; Glumac-AL; Kapralova-V; Cheikhi-A; Tyurina-YY; Vagni-VA; Kochanek-PM; Kagan-VE; Bayir-H
Source
J Neurosci Methods 2011 Sep; 201(1):185-190
NIOSHTIC No.
20040043
Abstract
Ascorbate is a vital reductant/free radical scavenger in the CNS, whose content defines - to a large extent - the redox status and the antioxidant reserves. Quick, reliable and specific methods for its measurement in brain samples are highly desirable. We have developed a new high-throughput screening assay for measurements of ascorbate using a fluorescence plate-reader. This assay is based on a direct reaction of ascorbate with a nitroxide radical conjugated with a fluorogenic acridine moiety, 4-((9-acridinecarbonyl)-amino)-2,2,6,6-tetramethylpiperidine-1-oxyl radical (AC-TEMPO), yielding fluorescent hydroxylamine product (AC-TEMPO-H). The reaction was monitored over time using fluorescence and electron spin resonance techniques. The appearance of fluorescent AC-TEMPO-H was linear within the range of 3.75-75µM AscH(-) in the sample (0.5-10µM AscH(-) in the well). Assay was validated with high performance liquid chromatography method. The concentration of ascorbate in murine tissue samples, including brain samples after traumatic brain injury and hemorrhagic shock, was measured.
Keywords
Antioxidants; Brain-matter; Sampling; Sampling-methods; Laboratory-techniques; Author Keywords: Vitamin C; Ascorbic acid; Nitroxides; Controlled cortical impact; Hemorrhagic shock; Head trauma
Contact
Hülya Bayir, Department of Critical Care Medicine, University of Pittsburgh, 4401 Penn Avenue, Pittsburgh, PA 15224, USA
CODEN
JNMEDT
Publication Date
20110930
Document Type
Journal Article
Email Address
bayihx@ccm.upmc.edu
Fiscal Year
2011
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-008282; B12212011
Issue of Publication
1
ISSN
0165-0270
Source Name
Journal of Neuroscience Methods
State
PA
Performing Organization
University of Pittsburgh at Pittsburgh
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