The ESI()-FT-ICR mass spectra of the fresh and aged CW for a
period of time ranging from 1 to 15 days are shown in Fig. 2. A clear
and evident change in the chemical profile of CW was observed
after 3 days of ageing in the m/z 150–250 and 350–450 regions. Initially,
the relative intensity of the natural markers (the m/z 215 and
377 ions–sugar molecules) decreases as a function of ageing time,
with the last marker disappearing after 3 days of ageing. New
chemical species were then identified, and their chemical,
structural, and molecular formulas, measured and theoretical m/z
values, mass errors, and DBEs are shown in Table 1.