Charge migration fragmentation in the negative ion mode of cyclopentenone and cyclopentanone intermediates in the biosynthesis of jasmonates
作者:Ernst H. Oliw、Mats Hamberg
DOI:10.1002/rcm.8665
日期:2020.4.30
with 2 H at C-6 and C-7 and with structural and side chain analogs. RESULTS CID of [6,6,7,7-2 H4 ]12-OPEA and [6,6-2 H2 ]12-OPDA ([M-H]- and [M-H-CO2 ]- ) showed that one or two 2 H atoms were transferred to anions at m/z 165 as judged by the signal intensities of m/z 165+1 or 165+2, respectively. CID of [6,6-2 H2 ]- and [6,6,7,7-2 H4 ]-12-OPA ([M-H]- and [M-H-CO2 ]- ) yielded H2 loss from the cyclopentanone
RATIONALE茉莉酸酯是由植物中的12-氧-10,15(Z)-植物二烯酸(12-OPDA)以及真菌中的12-氧-10-植物烯酸(12-OPEA)形成的。它们的[MH]-碰撞诱导解离(CID)在m / z 165 [C11 H17 O]-处产生特征产物阴离子。我们的目标是通过12-OPDA,12-OPEA和12-氧代苯甲酸(12-OPA)的CID研究这种阴离子的结构和形成方式。方法我们通过电喷雾电离和12-OPDA,12-OPEA和12-OPA的MS / MS分析,研究了[MH]-,[MH-CO2]-和[MH-H2 O]-阴离子的CID。将结果与使用在C-6和C-7处标记有2 H的相应化合物以及结构和侧链类似物获得的数据进行了比较。结果CID为[6,6,7,7-2 H4] 12-OPEA和[6,6-2 H2] 12-OPDA([MH]-和[MH-CO2]-)表明,根据m / z 165+的信号强度判断,一个或两个2