MS/MS of phosphocholines

[JWL]

Anyone familiar with the fragmentation pathway of phosphocholine?

Usually, there are two specific marker fragments at m/z 184 and 104 at positive mode. But one of my compound give fragments at m/z 184, 185, 186, and 104, 105, 106. I can not figour out what could be the 185, 186 and 105, 106. The intensity of 185 and 186 are about same, and is about 1/3 of the 184, so it is not isotopic peaks. What could they be? Can anyone help? Thanks!

[yangz00g]

The simplest way is to infuse your compund into MS, and do a Collision Enegy gradient to see what duaghter ions you can get at certain voltage (both positive and engative mode). That will give the basics of fragmention pathways.