It's in literature several times that they have a significantly different Rf, benz.
Check this file I uploaded here with the Rfs of different alkaloids according to literature: Rf for different alkaloids (TLC/Paper/Column chromatography) - Plant Analysis and Substance Testing - Welcome to the DMT-Nexus
Of course for a definite identification one would need mass-spec, but if making n-oxide works as according to literature with hydrogen peroxide, if the Rf's match, and if when testing some plant material you see spot at same height and changing to the same color with some reagent, its very very good possibility.. And if its not there at all, well its also very likely dmt n-oxide is not present at all.. Dont you agree?
Check this file I uploaded here with the Rfs of different alkaloids according to literature: Rf for different alkaloids (TLC/Paper/Column chromatography) - Plant Analysis and Substance Testing - Welcome to the DMT-Nexus
Of course for a definite identification one would need mass-spec, but if making n-oxide works as according to literature with hydrogen peroxide, if the Rf's match, and if when testing some plant material you see spot at same height and changing to the same color with some reagent, its very very good possibility.. And if its not there at all, well its also very likely dmt n-oxide is not present at all.. Dont you agree?