Oliveira, Elisangela Gonçalves deRosa, Gabriela da SilveiraMoraes, Mariana Agostini dePinto, Luiz Antonio de Almeida2017-07-312017-07-312009OLIVEIRA, Elizangela Gonçalves de et al. Moisture sorption characteristics of microalgae Spirulina platensis. Brazilian Journal of Chemical Engineering, v.26, n.1, p.189-197, 2009. Disponível em: <http://www.scielo.br/scielo.php?script=sci_pdf&pid=S0104-66322009000100018&lng=en&nrm=iso&tlng=en>. Acesso em: 31 Jul. 2017.0104-6632.http://repositorio.furg.br/handle/1/7475In recent times, the microalgae Spirulina platensis has been used as a functional ingredient in several food applications; its process involving drying and storage steps. Moisture equilibrium data for adsorption isotherms of microalgae Spirulina were investigated at 10, 20 and 30°C and for desorption, at 40, 50 and 60°C, using the gravimetric static method. The experimental data were analyzed by GAB and BET models. The GAB equation showed the best fitting to the experimental data with R² ≈ 99% and MRE < 10%. The water surface area values calculated by GAB and BET models were very similar. The isosteric heats were determined by application of Clausius-Clapeyron equation to sorption isotherms obtained from the best-fitting equation. The isosteric heat and the entropy of desorption isotherm presented similar behavior, with a sharp change in an equilibrium moisture content of 10%. The enthalpy-entropy compensation theory was applied to the isotherms, indicating that they are enthalpy-controlled.engrestrict accessSpirulina platensisEquilibrium isothermsHeat of sorptionDifferential entropy.article10.1590/S0104-66322009000100018