The mechanism of ionization and fragmentation for terphenyl (diphenylbenzene) with three structural ring isomers (ortho-, meta- and para-), and stilbene (1,2-diphenylethylene) with two geometrical isomers (trans- and ...The mechanism of ionization and fragmentation for terphenyl (diphenylbenzene) with three structural ring isomers (ortho-, meta- and para-), and stilbene (1,2-diphenylethylene) with two geometrical isomers (trans- and cis-) by EI mass spectrometry and ionization efficiency curves are investigation.展开更多
Cefquinome was studied by ESI and EI mass spectrometry,and its structure was proved from mass spectrometry. The results indicated that ESI positive ion of cefquinome included[M+H]+529,395.5,323.6,166.6.the main fragme...Cefquinome was studied by ESI and EI mass spectrometry,and its structure was proved from mass spectrometry. The results indicated that ESI positive ion of cefquinome included[M+H]+529,395.5,323.6,166.6.the main fragmentations of EI MS involved m/z 528,395,239,225,33,132,105,91,77,44,and so on.The structure segment accorded with its cracking.展开更多
文摘The mechanism of ionization and fragmentation for terphenyl (diphenylbenzene) with three structural ring isomers (ortho-, meta- and para-), and stilbene (1,2-diphenylethylene) with two geometrical isomers (trans- and cis-) by EI mass spectrometry and ionization efficiency curves are investigation.
文摘Cefquinome was studied by ESI and EI mass spectrometry,and its structure was proved from mass spectrometry. The results indicated that ESI positive ion of cefquinome included[M+H]+529,395.5,323.6,166.6.the main fragmentations of EI MS involved m/z 528,395,239,225,33,132,105,91,77,44,and so on.The structure segment accorded with its cracking.
