A second benefit of MS detection is the availability of mass spectra from unknown peaks. In fact, even if LC/MS spectra are known to provide less information than EI GC/MS spectra, fragmentation of molecules can easily be obtained by increasing the MS cone voltage, as illustrated in Fig. 3. Due to low fragmentation possibilities, fructose mass spectra are quite the same at 100 and 150V, with three major peaks at m/z = 169, 187 and 205, correspond ing respectively to [C6H12O6 +Li+H2O]+, [C6H12O6 + Li]+ and [C6H12O6 +Li+H2O]+ ions. The fragmentation of sucrose is significantly different: the pseudo-molecular peak [C12H22O11 + Li]+ (m/z = 349) is largely prominent at 100V whereas glucose and fructose fragments (m/z = 169, 187 and 205) are enhanced at 150V.