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. Author manuscript; available in PMC: 2011 Aug 1.
Published in final edited form as: J Appl Toxicol. 2010 Aug;30(6):559–565. doi: 10.1002/jat.1526

Table 2.

Multiple Reaction Monitoring (MRM) transitions for the BChE active site peptide

BChE Active site peptide SVTLFGESAGAASVSLHLLSPGSHSLFTR Charge Parent ion m/z transition to y9 transition to y10
unlabeled BChE peptide 4 733.8 1001.5 1088.5
dichlorvos labeled; added mass +108 4 760.3 1001.5 1088.5
aged dichlorvos labeled; added mass +94 4 756.8 1001.5 1088.5
aged chlorpyrifos oxon labeled; added mass +108 4 760.3 1001.5 1088.5
Aldicarb/Baygon labeled; added mass +57 4 747.6 1001.5 1088.5

Theoretical masses in the QTRAP mass spectrometer are listed. Masses of the quadruply charged parent ions are average masses, while those of the singly charged y9 and y10 ions are monoisotopic masses. The monoisotopic mass of the singly charged unlabeled peptide is 2928.5 amu. The accession number for human butyrylcholinesterase in the NCBI nonredundant database is gi:116353. This sequence includes 28 amino acids of the signal peptide, so that Ser 198 is numbered Ser 226.