将电喷雾解吸电离质谱(DESI-MS)用于临床尿样的分析,优化了电喷雾溶剂流速、电喷雾电压和喷雾锥距离等重要参数.采用普通滤纸作为样品载体,在不需要样品预处理的前提下同时快速测定了临床尿样中的钾、钠、尿素、尿酸、丙酮酸和肌苷等多...将电喷雾解吸电离质谱(DESI-MS)用于临床尿样的分析,优化了电喷雾溶剂流速、电喷雾电压和喷雾锥距离等重要参数.采用普通滤纸作为样品载体,在不需要样品预处理的前提下同时快速测定了临床尿样中的钾、钠、尿素、尿酸、丙酮酸和肌苷等多种成分,并对各种成分的主要离子进行了串联质谱鉴定.DESI-MS在进行多组分同时测定时不需要进行样品预处理,缩短了测定时间,单个样品的分析时间不到1 m in.同时,采用内标法对所测定组分进行了半定量分析.展开更多
A facile synthetic route for conjugated polymer PPESO3 was proposed,through which not only the procedure was simplified,but also the dealkylation by BBr3 was avoided,and therefore,the preparing difficulty and danger w...A facile synthetic route for conjugated polymer PPESO3 was proposed,through which not only the procedure was simplified,but also the dealkylation by BBr3 was avoided,and therefore,the preparing difficulty and danger were greatly reduced,which was obviously beneficial to the preparation and application of(PPESO3).At the same time,the interactions between(PPESO3) and nonionic surfactant（PVP） were investigated.The results indicate that the aggregation of polymer backbone was effectively broken up and the steady complexes consisted of PPESO3 and PVP were formed which would contribute to the preparation of highly sensitive bio-sensors due to the affinity of PVP to biological macromolecules.展开更多
文摘将电喷雾解吸电离质谱(DESI-MS)用于临床尿样的分析,优化了电喷雾溶剂流速、电喷雾电压和喷雾锥距离等重要参数.采用普通滤纸作为样品载体,在不需要样品预处理的前提下同时快速测定了临床尿样中的钾、钠、尿素、尿酸、丙酮酸和肌苷等多种成分,并对各种成分的主要离子进行了串联质谱鉴定.DESI-MS在进行多组分同时测定时不需要进行样品预处理,缩短了测定时间,单个样品的分析时间不到1 m in.同时,采用内标法对所测定组分进行了半定量分析.
文摘A facile synthetic route for conjugated polymer PPESO3 was proposed,through which not only the procedure was simplified,but also the dealkylation by BBr3 was avoided,and therefore,the preparing difficulty and danger were greatly reduced,which was obviously beneficial to the preparation and application of(PPESO3).At the same time,the interactions between(PPESO3) and nonionic surfactant（PVP） were investigated.The results indicate that the aggregation of polymer backbone was effectively broken up and the steady complexes consisted of PPESO3 and PVP were formed which would contribute to the preparation of highly sensitive bio-sensors due to the affinity of PVP to biological macromolecules.
文摘采用微波谐振腔对细胞色素c以及牛血清白蛋白进行微波辅助酶解,通过电喷雾三级四极杆质谱对得到的肽段进行分析,证明该方法可用很低的微波功率将蛋白质彻底酶解为多肽.通过调整微波条件可以使蛋白质的酶解效率基本达到100%,细胞色素c和牛血清白蛋白的序列覆盖率分别为45%和26%.该方法不但可将蛋白酶解时间由传统方法的16 h缩短为20min,还将功率由使用微波炉时的数百瓦降至20 W.
