@article{Kulrattanarak_2021, title={Evaluation of mathematical modelings of pineapple juice concentration using different combination techniques}, volume={9}, url={https://li01.tci-thaijo.org/index.php/fabjournal/article/view/243939}, abstractNote={<p>Pineapple juice was concentrated by four different evaporation methods including vacuum (V), vacuum with rotation (VR), ultrasonic atomization assisted vacuum evaporation (UAV) and ultrasonic atomization assisted vacuum evaporation with rotation (UAVR) methods and the temperature were 50, 55 and 60°C for all methods. The pH value, total soluble solid and color parameters (L*, a* and b*) of pineapple juice were measured. The result showed that the pH was not significantly affected by evaporation methods and the temperature. The color parameters were changed by increasing temperature with all evaporation methods. The evaporation times of UAV, VR and UAVR were shorter than V approximately 2.02, 3.59 and 4.89 times, respectively. Midilli model was the best-describing model for pineapple juice evaporation with highest R<sup>2</sup> (≥ 0.982), and lowest X<sup>2</sup> (≤ 0.002) and RMSE (≤0.042) values. The changes of concentration (TSS) during evaporation were described by first order kinetics equation and activation energies (Ea) of pineapple juice concentration were calculated using Arrhenius relationship equation. The Ea of pineapple juice concentration was in the range from 88.188-114.584 kJ/mol·K.</p>}, number={2}, journal={Food and Applied Bioscience Journal}, author={Kulrattanarak, Thanawit}, year={2021}, month={Aug.}, pages={53–67} }