Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Major ions observed by positive ESI-MS of amide and amide-ester peaks and the major fragments detected by LC-MS-MS of these two compounds
| Compound | m/z | Major fragments |
|---|---|---|
|
Amide (M = C
19
H
39
NO
6
) |
377 |
|
| [M + H]+ |
378 |
360, 196, 78 |
| [M + Na]+ |
400 |
382 |
| [M + H–H20]+ |
360 |
178, 164 |
|
Amide-ester (M = C
31
H
61
NO
7
) |
559 |
|
| [M + H]+ |
560 |
360, 542, 178 |
| [M + Na]+ |
582 |
|
| [M + H–H20]+ |
542 |
360 |
| [2 M + Na]+ | 1141 | 582 |
