CZE ESI MS is one of the most sensitive detection method and one of the potential method for protomics analysis. In this work, peptide mixture was separated and detected by using CZE ESI MS, and the influence of pH va...CZE ESI MS is one of the most sensitive detection method and one of the potential method for protomics analysis. In this work, peptide mixture was separated and detected by using CZE ESI MS, and the influence of pH value of buffer and composition of sheath liquid on CE separation and MS detection was investigated. The method allows the detection limits up to 4 2—33 pg. The result of this method is better than that of CE UV for the peptide analysis.展开更多
采用微波辅助提取法,以50%乙醇作为提取剂,提取野菜鼠曲草中的黄酮类化合物,提取物经AB-8大孔树脂纯化后,利用高效液相色谱电喷雾离子化串联质谱(high performance liquid chromatography electrospray ionization tandem mass spectrom...采用微波辅助提取法,以50%乙醇作为提取剂,提取野菜鼠曲草中的黄酮类化合物,提取物经AB-8大孔树脂纯化后,利用高效液相色谱电喷雾离子化串联质谱(high performance liquid chromatography electrospray ionization tandem mass spectrometry,LC-ESI-MS/MS)结合标准品比对法对其组成进行分析,从中鉴定出8种黄酮和3种酚酸类化合物:3,5-二咖啡酰奎宁酸(4.957μg/mg)、绿原酸(2.144μg/mg)、奎宁酸(1.073μg/mg)、毛地黄黄酮(0.884μg/mg)、紫云英苷(0.777μg/mg)、金丝桃苷(0.486μg/mg)、芹菜素-7-葡萄糖苷(0.327μg/mg)、槲皮素-3-O-槐糖苷(0.144μg/mg)、槲皮素(0.072μg/mg)、木犀草苷(0.066μg/mg)和野黄芩苷(0.056μg/mg)。其中奎宁酸、芹菜素-7-葡萄糖苷、紫云英苷、槲皮素-3-O-槐糖苷在该植物中尚属首次发现。展开更多
利用DNA重组技术在柞蚕蛹中表达重组人促红细胞生成素(Recombinant human erythropoietin,rhEPO),经过亲和层析纯化后,用SDS-PAGE分离纯化各组分,并通过电喷雾电离串联质谱技术(ESI-MS/MS)检测其糖基化修饰.结果显示,在柞蚕蛹中表达的rh...利用DNA重组技术在柞蚕蛹中表达重组人促红细胞生成素(Recombinant human erythropoietin,rhEPO),经过亲和层析纯化后,用SDS-PAGE分离纯化各组分,并通过电喷雾电离串联质谱技术(ESI-MS/MS)检测其糖基化修饰.结果显示,在柞蚕蛹中表达的rhEPO比活性约为1190 U/μg,其糖基化修饰位点与人体表达的EPO一致,有3个N-糖基化位点和1个O-糖基化位点.凝集素杂交实验结合质谱结果表明,柞蚕蛹表达的rhEPO的糖链中缺乏唾液酸修饰,而缺少唾液酸修饰的EPO通过鼻腔给药后在多种神经系统疾病的治疗中发挥着重要的作用.所得结果为进一步研究外源蛋白在柞蚕蛹-柞蚕核型多角体病毒(Anthraea pernyi nucleopolyhedrorirus,ApNPV)宿主载体表达系统表达后的糖基化与生物活性提供了依据.展开更多
文摘CZE ESI MS is one of the most sensitive detection method and one of the potential method for protomics analysis. In this work, peptide mixture was separated and detected by using CZE ESI MS, and the influence of pH value of buffer and composition of sheath liquid on CE separation and MS detection was investigated. The method allows the detection limits up to 4 2—33 pg. The result of this method is better than that of CE UV for the peptide analysis.
文摘采用微波辅助提取法,以50%乙醇作为提取剂,提取野菜鼠曲草中的黄酮类化合物,提取物经AB-8大孔树脂纯化后,利用高效液相色谱电喷雾离子化串联质谱(high performance liquid chromatography electrospray ionization tandem mass spectrometry,LC-ESI-MS/MS)结合标准品比对法对其组成进行分析,从中鉴定出8种黄酮和3种酚酸类化合物:3,5-二咖啡酰奎宁酸(4.957μg/mg)、绿原酸(2.144μg/mg)、奎宁酸(1.073μg/mg)、毛地黄黄酮(0.884μg/mg)、紫云英苷(0.777μg/mg)、金丝桃苷(0.486μg/mg)、芹菜素-7-葡萄糖苷(0.327μg/mg)、槲皮素-3-O-槐糖苷(0.144μg/mg)、槲皮素(0.072μg/mg)、木犀草苷(0.066μg/mg)和野黄芩苷(0.056μg/mg)。其中奎宁酸、芹菜素-7-葡萄糖苷、紫云英苷、槲皮素-3-O-槐糖苷在该植物中尚属首次发现。
