In this study, acid hydrolysis of glucan derived from Gelidium amansii was evaluated using kinetic interpretation. The primary goal of this study was to gain a more accurate kinetic data of glucose formation and decomposition from a match between a first-order reaction model and the experimental data at final reaction temperature (190 degrees C) and sulfuric acid concentration (4.0% w/v) in a bomb tube reactor. Reaction rates for the generation of glucose and decomposed products were strongly dependent on reaction temperature and acid concentration. The maximum yield of glucose of 38.09% was found under the conditions. Activation energy (E-1) and the pre-exponential factor (A(01)) for glucose formation were 51.474 kJ/mol and 5.8981 x 10(4) min(-1) respectively. For glucose decomposition, the activation energy (E2) and the pre-exponential factor (A02) were 69.966 kJ/mol and 1.043 x 10(7) min(-1), respectively. (C) 2011 Elsevier Ltd. All rights reserved.