uted to other intermediates that co-eluted with the m/z 226 intermediate.
Moreover, the appearance of the degradation intermediate
at m/z 226 was in agreement with the previously reported
results on the enzymatic degradation of sulfonated phthalocyanine
dyes using soybean peroxidase and white-rot fungus Bjerkandera
adusta [57]. The product-ion scan of this intermediate confirmed
the structure of a sulfophthalimide molecule, which resulted from
breaking the phthalocyanine ring and oxidation of the substituted
phthalimide groups.