NEAR-INFRARED SPECTROSCOPY TO MONITOR β-CAROTENE ADSORPTION AT HIGH PRESSURES
The goal of this work was to study the β-carotene recovery in a high pressure variable volume cell with in situ monitoring via near infrared spectroscopy (NIR). The kinetics and adsorption equilibrium of β-carotene in dichloromethane (DCM) with the polymer resin Diaíon HP-20 were evaluated. Kinetic curves were obtained at different initial pigment concentrations at 293 K. The Pseudo-first order and Pseudo-second order models were fitted to the experimental data. Adjustments of the Langmuir and Freundlich isotherms to the experimental data were evaluated. The Langmuir model was the one that fitted better the experimental data over the entire range studied. The maximum adsorption capacity estimated by the Langmuir model was 200 mg/g at 293 K with about 40 minutes of contact time.