Highly sensitive determination of non-steroidal anti-inflammatory drug nimesulide using electrochemically reduced graphene oxide nanoribbons

Preparation of an electrochemically reduced graphene nanoribbon (ER-GONR) film modified screen-printed carbon electrode for the highly sensitive determination of nimesulide.

Effects of a cyclooxygenase-2 preferential inhibitor in young healthy dogs exposed to air pollution: a pilot study

Residency in cities with high air pollution is associated with neuroinflammation and neurodegeneration in healthy children, young adults, and dogs. Nonsteroidal anti-inflammatory drugs may offer neuroprotection. The authors measured the plasma concentrations of 3-nitrotyrosine and the cerebro-spinal-fluid concentrations of prostaglandin E2 metabolite and the oligomeric form of amyloid derived diffusible ligand; measured the mRNA expression of cyclooxygenase-2, interleukin 1beta, CD14, and Aquaporin-4 in target brain areas; and evaluated brain MRI, cognition, and neuropathology in 8 dogs treated with a preferential cyclooxygenase-2 inhibitor (Nimesulide) versus 7 untreated litter-matched Mexico City dogs. Nimesulide significantly decreased nitrotyrosine in plasma (p < .0001), frontal gray IL1beta (p = .03), and heart IL1beta (p = .02). No effect was seen in mRNA COX2, amyloid, and PGE2 in CSF or the MRI white matter lesions. All exposed dogs exhibited olfactory bulb and frontal accumulation of Abeta(42) in neurons and blood vessels and frontal vascular subcortical pathology. White matter hyperintense MRI frontal lesions were seen in 4/6 non-treated and 6/8 treated dogs. Nonsteroidal anti-inflammatory drugs may offer limited neuroprotection in the setting of severe air pollution exposures. The search for potentially beneficial drugs useful to ameliorate the brain effects of pollution represents an enormous clinical challenge.

Rapid and simple high-performance liquid chromatographic determination of nimesulide in human plasma

A high-performance liquid chromatographic method for the quantitation of nimesulide in human plasma is presented. The method is based on protein precipitation with methanol and reversed-phase chromatography with spectrophotometric detection at 404 nm. The separation was performed on a Nucleosil 120-5 C18, 50 x 4-mm I.D. column and the mobile phase consisted of acetonitrile-methanol-15 mM potassium dihydrogenphosphate buffer, pH 7.3 (30:5:65, v/v). Only 250 microl of plasma are used for sample preparation and no internal standard is necessary. The limit of quantitation is 80 ng/ml and the calibration curve is linear up to 10,000 ng/ml. More than 20 samples can be analysed within 1 h. Within-day and between-day precision expressed by relative standard deviation is less than 5% and inaccuracy does not exceed 8%. The assay was used for pharmacokinetic studies.