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A rapid and simple method for the determination of 3,4-dihydroxyphenylacetic acid, norepinephrine, dopamine, and serotonin in mouse brain homogenate by HPLC with fluorimetric detection.
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J Pharm Biomed Anal 2014 Jun; 98C:266-270
Authors: Giuseppe Egidio De Benedetto, Daniela Fico, Antonio Pennetta, Cosimino Malitesta, Giuseppe Nicolardi, Dario Domenico Lofrumento, Francesco De Nuccio, Velia La Pesa
A fast and simple isocratic high-performance liquid chromatography method for the determination of 3,4-dihydroxyphenylacetic acid (DOPAC), norepinephrine (NE), dopamine (DA), and serotonin (5-HT) in homogenate samples of mouse striatum employing the direct fluorescence of the neurotransmitters is described. The method has been optimized and validated. The analytes were separated in 15min on a reversed-phase column (C18) with acetate buffer (pH 4.0, 12mM)-methanol (86:14, v/v) as mobile phase; the flow rate was 1ml/min. The fluorescence measurements were carried out at 320nm with excitation at 279nm. The calibration curve for DA was linear up to about 2.5?g/ml, with a coefficient of determination (r(2)) of 0.9995 with a lower limit of quantification of 0.031?g/ml. Since the procedure does not involve sample pre-purification or derivatisation, the recovery ranged from 97% to 102% and relative standard deviation (RSD) was better than 2.9%, the use of the internal standard is not mandatory, further simplifying the method. Similar performance was obtained for the other analytes. As a result, thanks to its simplicity, rapidity and adequate working range, the method can be used for the determination of 3,4-dihydroxyphenylacetic acid, dopamine, norepinephrine and serotonin in animal tissues. An experimental 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine mouse model of Parkinson-like disease has been used to demonstrate the method is fit-for-purpose.
PMID: 24971521 [PubMed - as supplied by publisher]