alexa Quantitation of nitric oxide formation from nitrovasodilator drugs by chemiluminescence analysis of headspace gas.
Pharmaceutical Sciences

Pharmaceutical Sciences

Pharmaceutica Analytica Acta

Author(s): Brien JF, McLaughlin BE, Nakatsu K, Marks GS

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Abstract A rapid and reliable method has been developed for the quantitation of nitric oxide by chemiluminescence analysis of headspace gas. Aqueous nitric oxide standards are used to calibrate the method. There is a linear relationship between the amount of nitric oxide and the redox chemiluminescence detector response over the range of 52-2445 pmol of nitric oxide in 2.0 mL of deionized water contained in a sealed 6.2-mL flask. The intra-day and inter-day coefficient of variation values of the method do not exceed 4\% and 9\%, respectively. The lower limit of quantitative sensitivity and the lower limit of qualitative detection are 52 pmol and 26 pmol of nitric oxide, respectively. This method has been used to measure nitric oxide formation during the incubation of glyceryl trinitrate or sodium nitroprusside in the presence of cysteine. This method has two major advantages over the currently available procedures for the quantitation of nitric oxide, viz., no artifactual formation of nitric oxide during sample preparation and decreased instrumental contamination.
This article was published in J Pharmacol Methods and referenced in Pharmaceutica Analytica Acta

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