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Validated and rapid measurement of the ferric reducing antioxidant power in plasma samples

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Abstract

The ferric reducing antioxidant power assay was developed using rat plasma samples and validated according to the Food and Drug Administration guidelines as well as strategies for the lack of endogenous compounds-free samples of matrix. For validation procedures, the phosphate buffered saline solution was used as the artificial matrix because this led to a direct interpolation in calibration curves. The absorbance responses and antioxidant activities in curves showed a second order polynomial relationship (R2 value = 0.9982). The precision, accuracy, and stability of the method ranged from 1.7 to 7.2%, 89.8 to 100.0%, and 82.7 to 111.6%, respectively. This assay had a short time of analysis (96 samples per min) and absence of interferences during the spectrophotometric monitoring. For the application of the method, the plasma antioxidant capacity, blood distribution of levofloxacin, and biometry hematic were evaluated in samples obtained from rats under different experimental conditions. The in vitro condition applied to blood samples increased the plasma antioxidant capacity and volume of erythrocytes, whereas diminished the levofloxacin concentration in these cells. The high antioxidant activity was produced by a high amount of inosine, which in turn was caused by high oxidative stress leading to an impaired blood distribution of levofloxacin and erythrocyte swelling. This assay is a validated and rapid biomarker for the evaluation of the total antioxidant capacity in plasma samples.

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Abbreviations

ACK:

Acesulfame potassium

bw:

Body weight

FDA:

Food and Drug Administration

FRAP:

Ferric reducing antioxidant power (µmol Fe(II) L−1)

LC:

Liquid chromatography

LLOQ:

Lower limit of quantification (µmol Fe(II) L−1)

LVX:

Levofloxacin

MCHC:

Mean corpuscular hemoglobin concentration (g dL−1)

MCV:

Mean corpuscular volume (fL)

PBS:

Phosphate buffered saline

QC:

Quality control

R 2 :

Coefficient of determination

TPTZ:

2,4,6-Tris(2-pyridyl)-s-triazine

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Acknowledgements

This work was supported by Scientific Research Funding obtained from the Autonomous University of San Luis Potosi (Grant Number C16-FAI-09-32.32). Maria L. Gonzalez-Rivera is a CONACYT fellow (Grant Number: 584981).

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Correspondence to Othoniel H. Aragon-Martinez.

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The authors declare that they have no conflict of interest.

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Gonzalez-Rivera, M.L., Martinez-Morales, F., Alonso-Castro, A.J. et al. Validated and rapid measurement of the ferric reducing antioxidant power in plasma samples. Chem. Pap. 72, 2561–2574 (2018). https://doi.org/10.1007/s11696-018-0512-9

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  • DOI: https://doi.org/10.1007/s11696-018-0512-9

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