2, 3-Dinor-6-keto-prostaglandin F<1a> (I), extracted from its acidic aqueous solution, was converted to its 1-m__--propylamide-6-methyloxime-9, 11, 15-tris-dimethylisopropylsilyl (DMIPS)-ether derivative by treating it with n__-propylamine. O-methylhydroxylamine-HCI and then with DMIPS-imidazole. The chromatogram of the reaction product showed a single broad peak accompanying a shoulder, which was considered to be the unresolved structural syn- and anti-isomer pair. The methylene unit value of this derivative was 34.28, being about 7.5 higher than that of the trimethylsilyl ether derivative of I methyl ester-methyloxime. The reaction product gave a mass spectrum with the ion of [M-43]+ at m/z 669 as a base peak. The molecular ion was observed at m/z 712 with low intensity, and many characteristic ions reflecting the structure with moderate or low intensity. The present I derivative concentrated more than 5% of the total ion current (above m/z 100) into the base peak ion. When Gas chromatography/high resolution selected ion monitoring was carried out at the resolution of 10000 monitoring the ion at m/z 669.4512, specific for the structural integrity of I, the selected ion recording showed a single broad peak with signal-to-noise ratio of more than 10 : 1 after injection of 2 picograms of the derivative.
2,3-Dinor-6-keto-prostaglandin F<1a> (I)从其酸性
水溶液中提取,通过用n-
丙胺处理,转化为1-m__--丙酰胺-6-甲基
肟-9,11,15-三-二甲基异丙基
硅烷(
DMIPS)-醚衍
生物。用O-甲基
羟胺-HCI处理,然后用
DMIPS-
咪唑处理。反应产物的色谱图显示一个宽峰和一个肩峰,被认为是未解决的同分异构体和对异构体。该衍
生物的亚甲基单元值为34.28,比I甲基酯-甲基
肟的三甲基
硅醚衍
生物高约7.5。反应产物在m/z 669处给出[
M-43]+的离子作为基峰。在m/z 712处观察到分子离子,强度较低,许多反映结构的特征离子强度中等或较低。目前的I衍
生物将总离子流(高于m/z 100)的5%以上集中到基峰离子中。当气相色谱/高分辨率选择离子监测以10000的分辨率监测m/z 669.4512处的离子时,该离子是I结构完整性的特异性离子,在注入2皮克