Degradation of N-Acetyl- D -glucosamine and D -Glucosamine in Subcritical Water and Properties of the Degradation Products

摘要: The degradation processes of N-acetyl-D-glucosamine (GlcNAc) and D-glucosamine in subcritical water were measured using a continuous tubular reactor at 170 to 210°C, 190 230°C, respectively. obeyed first-order kinetics the tested temperature ranges. dependences rate constants could be expressed by Arrhenius equation, activation energies pre-exponential factors for GlcNAc glucosamine estimated 126 kJ/mol 2.83 × 1012 s-1, 130 2.11 pH values reaction mixtures, which room temperature, decreased both substrates during degradation. main product was determined 5-(hydroxymethyl)-furfural. possessed weak radical-scavenging ability, while that did not.