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Complex heterogeneous systems, such as micelles or blood plasma, represent a particularly challenging environment to measure the catalytic parameters of some enzymes, including L-asparaginase. Existing methods are strongly interfered by the presence of plasma proteins, amino acids, as well as other components of plasma. Here we show that FTIR spectroscopy enables continuous real-time measurement of catalytic activity of L-asparaginase, in native and in PEG-chitosan conjugated form, in aqueous solutions as well as in heterogeneous non-tr