title: Determination of ng/mL levetiracetam using ultra-high-performance liquid chromatography-photodiode absorbance.
abstract: This paper demonstrates the analysis of levetiracetam, a new chiral antiepileptic drug, at ng/mL levels using an ultra-high-performance liquid chromatography (UHPLC)-photodiode absorbance (PDA) method. Three different sample preparation methods, liquid-liquid extraction with Extrelut, solid phase extraction (SPE) with Oasis HLB and Oasis MAX SPE cartridges, and protein precipitation with organic solvents were carried out. The last preparatory method is the simplest and provides the best recoveries: between 97.1% and 100.4% with RSD value below 5%. The column for separation is BEH C18 column (1.7 µm particle size and 100 × 2.1 mm i.d.) and acetonitrile-phosphate buffer (pH = 6.6; 0.01 M) (10/90 v/v) is the mobile phase. The results obtained are compared to analysis conducted by the HPLC method. The UHPLC method was validated in the range of 2-100 µg/mL levetiracetam concentration (R(2) = 0.9997). LOD and LOQ are 10 ng/mL and 33 ng/mL, respectively. The developed UHPLC method was applied to plasma samples of patient with epilepsy.
authors.affiliation: Budapest University of Technology and Economics, Department of Inorganic and Analytical Chemistry, Budapest, Hungary. eolah@mail.bme.hu
authors.forename: E
authors.initials: E
authors.lastname: Oláh
authors.forename: Gy
authors.initials: G
authors.lastname: Bacsói
authors.forename: J
authors.initials: J
authors.lastname: Fekete
authors.forename: V K
authors.initials: VK
authors.lastname: Sharma
mesh_terms: D001798:Blood Proteins / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004827:Epilepsy / Q000097:blood; D006801:Humans; D006863:Hydrogen-Ion Concentration; D000077287:Levetiracetam; D057230:Limit of Detection; D016014:Linear Models; D059625:Liquid-Liquid Extraction; D010889:Piracetam / Q000031:analogs & derivatives* / Q000097:blood; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D052616:Solid Phase Extraction; D013696:Temperature
chemical_list: D001798:Blood Proteins; D000077287:Levetiracetam; D010889:Piracetam