Dear colleagues,

I need to idetify peaks in the ESI MS spectra (the txt file is attached) . In this spectra I need to find the folic acid that was attached to the NH2 groups grafted onto Ag nanoparticles. The folic acid was removed from NPs by chemical treatment with trifluoroacetic acid in H2O and then the solution was introduced into the ESI MS.

Thanks a lot in advance.