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Matrix assisted laser desorption ionization time of flight mass spectrometry (MALDI-TOF-MS) of the chitooligomers (COS) mixtures obtained during the water-soluble chitosan hydrolysis for 48 h with the TKU033 crude enzyme. The proportion of low molecular weight oligomers was reduced by precipitation in the 90% methanol soluble/90% acetone insoluble fraction. The identified peaks are labeled with DP, in which DP indicates the degree of polymerisation.
