Application of the UV–vis spectrophotometry method for the determination of glutamate in the cerebrospinal fluid of rats

•Spectrophotometry of CSF glutamate levels is reliable.•More sustainable method for CSF glutamate dosing.•Useful for academic research detection. In experimental nociception models, there is an increase in the glutamate cerebrospinal fluid (CSF) and a decrease in its levels in analgesic treatments....

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Veröffentlicht in:Journal of pharmaceutical and biomedical analysis 2020-07, Vol.186, p.113290, Article 113290
Hauptverfasser: Ferreira, Cirley Pinheiro, Techera Antunes, Flavia Tasmim, Rebelo, Isadora Nunes, da Silva, Claudio Antônio, Vilanova, Fernanda Nunes, Corrêa, Dione Silva, de Souza, Alessandra Hubner
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Sprache:eng
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Zusammenfassung:•Spectrophotometry of CSF glutamate levels is reliable.•More sustainable method for CSF glutamate dosing.•Useful for academic research detection. In experimental nociception models, there is an increase in the glutamate cerebrospinal fluid (CSF) and a decrease in its levels in analgesic treatments. For the determination of glutamate in CSF, an analytical UV spectrophotometric method was developed and validated. The measurements on the UV–vis spectrophotometer were performed after the derivatization reaction of the neurotransmitter, when reading in the ultraviolet (UV) region, at the maximum absorption wavelength of 265 nm. The technique presented excellent linearity, as well as good intraday and interday precision, with coefficients of variation less than 15 %, and a correlation coefficient close to 1.0 (lower dispersion of the experimental set points and lower uncertainty of the estimated regression coefficients). The analytical conditions that were established by the ultraviolet spectrophotometric method demonstrated selectivity, linearity, precision, specificity, robustness, and accuracy. This is suitable for the quantitative determination of glutamate in the CSF. The technique developed by UV–vis spectrophotometry for glutamate dosing was fast, efficient, easy to perform, and more economically accessible when compared to current standard techniques. When comparing the data obtained in this study with the results of the official methodology, in which HPLC and spectrofluorimetry were used, it was observed that the closest values of glutamate release occurred between the spectrofluorimeter and the UV–vis spectrophotometer. The UV–vis spectrophotometry method for the determination of CSF glutamate has been shown to be accurate, reproducible, and satisfactory, making it an extremely advantageous and a viable alternative for the determination of amino acid glutamate.
ISSN:0731-7085
1873-264X
DOI:10.1016/j.jpba.2020.113290