Zhong nan da xue xue bao. Yi xue ban = Journal of Central South University. Medical sciences 2009-07-01

[Simultaneous determination of 5 sedative hypnotics in human plasma by reversed phase high-performance liquid chromatography].

Xianghui Liang, Zhiyong Dai, Wen'en Liu

Index: Zhong Nan Da Xue Xue Bao. Yi Xue Ban 34(7) , 689-92, (2009)

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Abstract

To determine diazepam, nitrazepam, oxazepam, estazolam, and alprazolam simultaneously in human plasma by reversed phase high-performance liquid chromatography (RP-HPLC).Ten microliter carbamazepine (50 mg/L)as the internal standard was added into 1 mL sample, which contained the 5 mixed sedative hypnotics as standard substance and human plasma as ground substance. They were extracted with acetoacetate from plasma samples, and then were dissolved by 100 microL mobile phase. The blood drug levels were analyzed by high performance liquid chromatograph with 20 microL sample injection on a chromatographic column C18 (4.6 mm x 250 mm) at 30 degree. The mobile phase consisted of methanol and water (65:35),and the flow rate was 1.0 mL/min.The ultraviolet detection wavelength was 230 nm.The linearity range of the 5 drugs was 5-1,200 microg/L (r> or =0.9966, P<0.05). The recovery rate was 95.5%-105.6%. The extraction recovery rate was more than 75%. The relative standard deviation (RSD) of intra-day and inter-day was less than 10% (n=5).RP-HPLC method is convenient, accurate and sensitive for simultaneous determination of the concentration of diazepam, nitrazepam, oxazepam, estazolam, and alprazolam in human plasma.