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Where to get fragmentation tables for interpreting MS
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How do you assign fragments to peaks based on their M/Z?
I found the following values online when looking at MS spectrum for aspirin. These seem to be correct, but how is it concluded that 180−42=138180−42=138 is a loss of the acetyl group, so on and so forth? For NMR, IR and UV, there are always tables to refer to, but there are no resources for this. How was each of these concluded?
Link:
- Loss of the acetyl group: 180−42=138180−42=138
- Loss of water from the acid group: 138−18=120138−18=120
- Loss of COCO from the acid group: 120−28=92120−28=92
- Loss of COCO from the phenolic group: 92−28=64
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