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Method for determining concentration of cefradine in blood plasma by liquid chromatography-tandem mass spectrometry

A technique of tandem mass spectrometry and liquid chromatography, applied in the field of drug analysis, can solve the problems such as the detection sensitivity of the determination method needs to be improved, the mobile phase of the determination method is complicated, the sample processing method is cumbersome, etc., to achieve excellent separation ability and avoid interference of endogenous substances. , The effect of sample pretreatment is simple

Inactive Publication Date: 2020-08-28
苏州必宜生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The assay method of cephradine in the blood plasma that has been established at present mainly contains HPLC method, but, the mobile phase of assay method is comparatively complicated, and sample processing method is also comparatively loaded down with trivial details; The detection sensitivity of the assay method still needs to be improved

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  • Method for determining concentration of cefradine in blood plasma by liquid chromatography-tandem mass spectrometry
  • Method for determining concentration of cefradine in blood plasma by liquid chromatography-tandem mass spectrometry
  • Method for determining concentration of cefradine in blood plasma by liquid chromatography-tandem mass spectrometry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: Determination of Cephradine in Plasma by Fast Liquid Chromatography-Tandem Mass Spectrometry

[0033] 1. Pretreatment of plasma samples:

[0034] Add 100 µL of plasma samples to a 96-well plate and add 50.0 µL of Tybipenem at a concentration of 250 ng . mL −1 300 µL of acetonitrile was added to the internal standard solution. Vortex for 5 min and centrifuge at 4500 rpm for 10 min at 4ºC. Pipette 50.0 µL of supernatant to a clean 96-well plate, add 100 µL of purified water and mix well. Take 2.00 µL of the supernatant for LC-MS / MS analysis.

[0035] 2. Preparation of standard series samples and quality control samples:

[0036] Weigh two parts of cephradine standard substance, dissolve with acetonitrile-water (1:1, v / v) to obtain a stock solution of cephradine with a concentration of 0.929mg / mL and 0.920mg / mL respectively, and one part is used for the standard series solution One for the preparation of quality control (QC) solution. Take the stock so...

Embodiment 2

[0042] Example 2: Methodological Validation

[0043] Carry out methodology verification to the assay method of embodiment 1, specifically as follows:

[0044] selectivity

[0045] The blank human plasma and LLOQ samples were processed and analyzed respectively, and the corresponding chromatograms were obtained. The selectivity of the evaluation method.

[0046] The results showed that endogenous substances did not interfere with the determination of cephradine and tibipenem. For a typical chromatogram see figure 1 and figure 2 .

[0047] standard curve line

[0048] Take the theoretical concentration of cephradine as the abscissa (x), and the area ratio of cephradine and the internal standard tibipenem as the ordinate (y), and perform linear regression calculation (weight factor W=1 / x 2 ), the typical regression equation of cephradine is y=0.000764x+0.00248 (r=0.9996), and cephradine is obviously linear in the range of 60.00~30000ng / mL.

[0049] Accuracy and Precision...

Embodiment 3

[0057] Embodiment 3: clinical sample detection

[0058] The Human Bioequivalence Test of Cephradine Capsules was approved by the ethics committee and included 8 healthy subjects. The subjects took 250 mg / capsule of cephradine capsules test preparation (T) or reference preparation (R) orally on an empty stomach in two cycles respectively, blood samples were collected at 0 h (within 1 h before taking the medicine) and at different time points after taking the medicine, and separated to obtain After plasma, the concentration of cephradine in plasma was determined by an established method. A subject drug concentration - time curve see image 3 .

[0059] It can be seen from the foregoing examples that the present invention enhances the chromatographic retention of cephradine by optimizing the liquid chromatography conditions. Plasma samples were pretreated by protein precipitation. After the plasma sample is processed by protein precipitation, the extract can be directly injec...

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Abstract

The invention discloses a method for determining the concentration of cefradine in blood plasma through liquid chromatography-tandem mass spectrometry. The method comprises the following steps: (1) carrying out pretreatment on a blood plasma sample; (2) determining the concentration of cefradine in the plasma sample subjected to pretreatment in the step (1) by adopting a liquid chromatography-tandem mass spectrometry method, wherein the liquid chromatography-tandem mass spectrometry comprises chromatographic conditions and mass spectrometry conditions, the chromatographic conditions comprise that an aqueous solution containing 0.1% formic acid and 5mM ammonium acetate is adopted as a mobile phase A, acetonitrile is adopted as a mobile phase B, and a volume ratio of the mobile phase A to the mobile phase B is 70: 30; performing isocratic elution, and the elution time is 3.0 min. By adopting the method disclosed by the invention, the rapid and sensitive detection of the cefradine in theblood plasma can be realized; the plasma consumption is low, and the sample pretreatment is simple.

Description

technical field [0001] The invention relates to the technical field of drug analysis, in particular to a method for determining the concentration of cephradine in blood plasma by liquid chromatography-tandem mass spectrometry. Background technique [0002] Cefradine (cefradine) is the first generation semi-synthetic cephalosporin, and it is the only cephalosporin available for oral, intramuscular and intravenous injection. Treatment of mild to moderate infections. [0003] Cephradine is well distributed in tissue and body fluids, and it can obtain effective concentrations in myocardium, uterus, lung, prostate and bone tissues, among which the drug concentration in brain tissue is only 5-10% of the blood concentration in the same period, and the concentration in cerebrospinal fluid is even lower ;Plasma protein binding rate is 6-10%, 6h after oral administration of 0.5g, more than 90% of the dose is accumulated and discharged. The assay method of cephradine in the blood pla...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06G01N30/34G01N30/72G01N30/86
CPCG01N30/02G01N30/06G01N30/34G01N30/724G01N30/8675
Inventor 黄立峰孙叶顾琴
Owner 苏州必宜生物科技有限公司
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