Yw. Yin et al., THE STUDY OF FAST-ATOM-BOMBARDMENT MASS-S PECTROMETRY OF THE N-PHOSPHORYL HYDROXYL AMINO-ACID AND THE PHOSPHORIC ESTER, Huaxue xuebao, 52(4), 1994, pp. 396-402
The fragmentation pathway of the N-phosphoryl hydroxyl amino acid and
the O-phosphoryl amino acid had their respective characteristics by su
ccessive losses of two molecules of CH3CH=CH2 and the HCO2H preferred
for the N-DIPP-hydroxy amino acids, while for N-DBP-Hydroxylmino acids
HCOOH was first lost, then one or two molecules of CH3CH2-CH=CH2 and
finally H2O. The phosphoryl group N-->O migration procduct gives the (
99)m/z, as the most intensive peak for O-DIPP(DBP)-Ser or O-DIPP(DBP)-
Thr. And the multiple checks for each of the molecular ion M+ and frag
ment ions F+ were possible through their successive peaks at M+-42(56)
, M+-84(112), F+-42(56), and F+-84(112).