Text data of Fig. 2. (A) mass spectrum of BPA standard (250 pmol) with matrix DHB (B) enlarged spectra of [BPA+H]+ and (C) the other BPA ion species. Several dehydrated BPA-DHB complexes were detected similar to dehydrated DHB dimer, [2DHB-2H2O+H]. BPA ion species including dehydrated BPA-DHB complexes had the boron isotope ions as same as [BPA+H]+ .