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. 2014 Nov 30;14(2):405–417. doi: 10.1074/mcp.O114.041376

Table I. Ion characteristics of isobaric labeling methods.

Property iTRAQ4 iTRAQ8
aRep+ 114–117 113–119,121
bLabel+ 145 305
Isobaric ion mass 144 304
Minimum B ion 202 362
Minimum Y ion 175 175
Low mass b/y free window 0∼175 0∼175
Maximum B ion MH+-174 MH+-174
Maximum Y ion MH+-201 MH+-361
High mass b/y free window MH+-174∼INF MH+-174∼INF
cPrecursor-Label+ MH+-144 MH+-304

a Rep+: reporter ions.

b Label+: isobaric tag ion.

c Precursor-Label+: the precursor ion without the isobaric tag.