Connexin43 mimetic peptide (Cx43MP) has been intensively investigated for its therapeutic effect in the management of inflammatory eye conditions, spinal cord injury, wound healing and iscbemia-induced brain damage....Connexin43 mimetic peptide (Cx43MP) has been intensively investigated for its therapeutic effect in the management of inflammatory eye conditions, spinal cord injury, wound healing and iscbemia-induced brain damage. Here, we report on a validated stability-indicating reversed-phase high performance liquid chromatography (RP-HPLC) method for the quantification of Cx43MP under stress conditions. These included exposure to acid/base, light, oxidation and high temperature. In addition, the degradation kinetics of the peptide were evaluated in bovine vitreous and drug-free human plasma at 37℃. Detection of Cx43MP was carried out at 214 nm with a retention time of 7.5 min. The method showed excellent linearity over the concentration range of 0.9-250μg/mL (R2a0.998), and the limits of detection (LOD) and quantification (LOQ) were found to be 0.90 and 2.98 μg/mL, respectively. The accuracy of the method determined by the mean percentage recovery at 7.8, 62.5 and 250μg/mL was 96.79%, 98.25% and 99.06% with a RSD of〈 2.2%. Accelerated stability studies revealed that Cx43MP was more sensitive to basic conditions and completely degraded within 24 h at 37℃(0% recovery) and within 12 h at 80℃ (0.34% recovery). Cx43MP was found to be more stable in bovine vitreous (t1/2 slow= 171.8 min) compared to human plasma (t1/2slow = 39.3 min) at 37℃ according to the two phase degradation kinetic model. These findings are important for further pre-clinical development of Cx43MP.展开更多
A rapid method for the simultaneous determination of daidzein,genistein and formonetin in solanum Lyratum Thunb by high performance liquid chromatography(HPLC)was developed.Separation was achieved on a Diamonsil C18 c...A rapid method for the simultaneous determination of daidzein,genistein and formonetin in solanum Lyratum Thunb by high performance liquid chromatography(HPLC)was developed.Separation was achieved on a Diamonsil C18 column(250 mm×4.6 mm,5 μm)with isocratic elution,using a mobile phase of methanol-tetrahydrofuran-water(44∶3∶53,v/v).The wavelength was set at 260 nm and column was maintained at 35 ℃.The linear ranges of daidzein,genistein and formonetin were 1.0-40.0,0.1-4.0 and 0.1-4.0 μg/mL,respectively.The average recoveries were between 98.4% and 101.3%.This method could be used for the quality control of Solanum lyratum Thunb due to its simplification,reliability,rapidity and excellent precision.展开更多
目的:采用反相液相色谱法测定巴洛沙星胶囊含量及有关物质。方法:采用 PICO TAG ^(TM)C_(18)色谱柱(5μm,3.9mm×150mm),以乙腈-水-十二烷基硫酸钠(400∶600∶2.5,用磷酸调节pH为3.0)为流动相;流速1.0mL·min^(-1);检测波长为29...目的:采用反相液相色谱法测定巴洛沙星胶囊含量及有关物质。方法:采用 PICO TAG ^(TM)C_(18)色谱柱(5μm,3.9mm×150mm),以乙腈-水-十二烷基硫酸钠(400∶600∶2.5,用磷酸调节pH为3.0)为流动相;流速1.0mL·min^(-1);检测波长为290nm,柱温:室温;进样量:20μL。结果:在该色谱条件下,巴洛沙星浓度在15-35μg·mL^(-1)范围内具有良好的线性关系,r=0.9999,精密度 RSD 为0.81%(n=6);巴洛沙星胶囊含量测定高、中、低3种浓度的回收率分别为98.3%,100.4%,99.9%;RSD分别为0.56%,0.62%,0.54%。结论:本法简便、快速、准确,专属性好。展开更多
基金the University of Auckland for providing an international doctoral scholarship to Rohit Bisht.
文摘Connexin43 mimetic peptide (Cx43MP) has been intensively investigated for its therapeutic effect in the management of inflammatory eye conditions, spinal cord injury, wound healing and iscbemia-induced brain damage. Here, we report on a validated stability-indicating reversed-phase high performance liquid chromatography (RP-HPLC) method for the quantification of Cx43MP under stress conditions. These included exposure to acid/base, light, oxidation and high temperature. In addition, the degradation kinetics of the peptide were evaluated in bovine vitreous and drug-free human plasma at 37℃. Detection of Cx43MP was carried out at 214 nm with a retention time of 7.5 min. The method showed excellent linearity over the concentration range of 0.9-250μg/mL (R2a0.998), and the limits of detection (LOD) and quantification (LOQ) were found to be 0.90 and 2.98 μg/mL, respectively. The accuracy of the method determined by the mean percentage recovery at 7.8, 62.5 and 250μg/mL was 96.79%, 98.25% and 99.06% with a RSD of〈 2.2%. Accelerated stability studies revealed that Cx43MP was more sensitive to basic conditions and completely degraded within 24 h at 37℃(0% recovery) and within 12 h at 80℃ (0.34% recovery). Cx43MP was found to be more stable in bovine vitreous (t1/2 slow= 171.8 min) compared to human plasma (t1/2slow = 39.3 min) at 37℃ according to the two phase degradation kinetic model. These findings are important for further pre-clinical development of Cx43MP.
基金supported by Liaoning Technology Gallery(2007226011)Shenyang Technology Division(1071164-9-00)
文摘A rapid method for the simultaneous determination of daidzein,genistein and formonetin in solanum Lyratum Thunb by high performance liquid chromatography(HPLC)was developed.Separation was achieved on a Diamonsil C18 column(250 mm×4.6 mm,5 μm)with isocratic elution,using a mobile phase of methanol-tetrahydrofuran-water(44∶3∶53,v/v).The wavelength was set at 260 nm and column was maintained at 35 ℃.The linear ranges of daidzein,genistein and formonetin were 1.0-40.0,0.1-4.0 and 0.1-4.0 μg/mL,respectively.The average recoveries were between 98.4% and 101.3%.This method could be used for the quality control of Solanum lyratum Thunb due to its simplification,reliability,rapidity and excellent precision.