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UHPLC-ESI-MS analysis of the hydrolysis of the oligomer DAAA using different chitosanases and a chitinase. The base peak chromatograms (left) and MS spectra belonging to peaks I–III (right) are shown. DAAA was incubated with the chitosanases (CSN-174, CSN-7M, CSN-MN, and CSN-MHKI) and chitinase B (ChiB) from Serratia marcescens. While ChiB completely hydrolyzed the tetramer DAAA (Peak III) into the dimers AA (Peak I) and DA (Peak II), no activity was observed for any of the chitosanases
