High resolution mass spectrometry was used in positive ion to study the element compositions and MS/MS analysis of Ni2+complexes of 2-hydroxy-4-methoxy-acetophenone schiff base.The result shows that new complexes was ...High resolution mass spectrometry was used in positive ion to study the element compositions and MS/MS analysis of Ni2+complexes of 2-hydroxy-4-methoxy-acetophenone schiff base.The result shows that new complexes was formed in ESI and [NiL1]+,Ni(L2)2 was dissociated in different way.展开更多
Two pairs of structural isomers isolated from Aconitum nagarum var.lasiandrum have been differentiated by ESI MS using hydroxylamine hydrochloride(NH2OH·HCl) derivative method.
首次尝试利用电喷雾电离质谱(ESI MS)和氢原子核磁共振(1 H NMR)技术分析了含笑属六种植物种子的磷脂特性,发现在两个指纹图谱区发现明显的差异,即在质荷比(m/z)895-910(ESI MS)和5.30～5.40mg/L(1 H NMR)两个特异的区域存在显著差异。...首次尝试利用电喷雾电离质谱(ESI MS)和氢原子核磁共振(1 H NMR)技术分析了含笑属六种植物种子的磷脂特性,发现在两个指纹图谱区发现明显的差异,即在质荷比(m/z)895-910(ESI MS)和5.30～5.40mg/L(1 H NMR)两个特异的区域存在显著差异。这些源于种子磷脂ESI/MS和1 H NMR的谱带差异可以被用来分析不同植物的种子的磷脂特征。而且,相似地,在更广的层面上,特异性的谱带差异可用于分析其他植物种子的磷脂组成和特性,辅助鉴定种子。展开更多
文摘High resolution mass spectrometry was used in positive ion to study the element compositions and MS/MS analysis of Ni2+complexes of 2-hydroxy-4-methoxy-acetophenone schiff base.The result shows that new complexes was formed in ESI and [NiL1]+,Ni(L2)2 was dissociated in different way.
文摘Two pairs of structural isomers isolated from Aconitum nagarum var.lasiandrum have been differentiated by ESI MS using hydroxylamine hydrochloride(NH2OH·HCl) derivative method.
基金Supported by the Particular Biological Conservation Foundation of the Chinese Academy of Sciences(KSCX2-YW-Z-0925)Chongqing Education Foundation(KJ100610)~~
文摘首次尝试利用电喷雾电离质谱(ESI MS)和氢原子核磁共振(1 H NMR)技术分析了含笑属六种植物种子的磷脂特性,发现在两个指纹图谱区发现明显的差异,即在质荷比(m/z)895-910(ESI MS)和5.30～5.40mg/L(1 H NMR)两个特异的区域存在显著差异。这些源于种子磷脂ESI/MS和1 H NMR的谱带差异可以被用来分析不同植物的种子的磷脂特征。而且,相似地,在更广的层面上,特异性的谱带差异可用于分析其他植物种子的磷脂组成和特性,辅助鉴定种子。
文摘建立了高效液相色谱-电喷雾串联质谱(HPLC-ESI MS/MS)分析环境水样中22种抗生素类药物的方法。采用HLB固相萃取柱对环境水样中的目标化合物进行富集、净化,然后以6mL氨水-甲醇(5∶95,v/v)溶液洗脱。收集的洗脱液经氮气吹干至1mL,然后进行HPLC-ESI MS/MS分离分析。色谱流动相A相为甲醇-乙腈(1∶1,v/v),B相为0.3%(体积分数)甲酸水溶液(含0.1%(体积分数)甲酸铵,pH2.9);色谱柱为XTerra MS C18柱。质谱检测采用正离子扫描,多反应监测模式。分别以自来水和污水作为基质,22种抗生素类药物的加标平均回收率分别为54.9%～130%和57.4%～138%,相对标准偏差(n=3)分别为2.85%～28.6%和2.02%～23.2%;方法的检出限为0.05～0.5ng/L。将建立的方法应用于北京市高碑店湖和小清河水样的分析,结果表明在两个水样中均有部分抗生素类药物检出。
