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A chromatographic method for baicalin quantification in rat thalamus
Author(s) -
Zhang Lujun,
Xing Dongming,
Ding Yi,
Wang Rufeng,
Wang Xueli,
Du Lijun
Publication year - 2005
Publication title -
biomedical chromatography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 65
eISSN - 1099-0801
pISSN - 0269-3879
DOI - 10.1002/bmc.467
Subject(s) - baicalin , chromatography , chemistry , high performance liquid chromatography , calibration curve , detection limit , methanol , organic chemistry
Abstract A rapid reversed‐phase high‐performance liquid chromatographic (rp‐HPLC) assay for the determination of baicalin in rat thalamus was developed. This was carried out on a Hypersil –C 18 column using 4‐nitro‐benzoic acid as the internal standard with a mobile phase of methanol–water–H 3 PO 4 (45:55:0.2, v/v/v). Detection was by UV at 277 nm. The calibration curve for baicalin was linear ( r = 0.9992) over the concentration range of 0.05–4.0 µg/mL and the limit of detection was 10 ng/mL. The coefcients of variation of intra‐ and inter‐day assays were 2.64, 5.19 and 3.19% and 3.46, 6.21 and 5.58% at concentrations of 0.5, 1.0 and 3.0 µg/mL, respectively. The recoveries of baicalin from rat thalamus were 85.4 ± 5.62, 90.7 ± 2.43 and 89.1 ± 4.75% at concentrations of 0.5, 1.0 and 3.0 µg/mL, respectively. The method was applied to determine the time course of baicalin in rat thalamus, following a single dosage of intravenous administration of Scutellariae radix extract at 90 mg/kg of baicalin to male Wistar rats. Copyright © 2005 John Wiley & Sons, Ltd.