Fig. 1

One microlitre aliquots, dried onto a Bruker MALDI-TOF MS sample plate, from 2-fold serial dilutions in Solution 1 of a single I. glandulifera seed (Harmondsworth Moor reference sample 1) initially extracted in 100 µl of Solution 1. The samples shown are, from left to right, undiluted, 2-fold dilution, 4-fold dilution, 8-fold dilution, 16-fold dilution, 32-fold dilution, 64-fold dilution, and 128-fold dilution