| Modeling of thin layer drying and investigation of bioactive compounds in combined drying (hot air-infrared) of apples |
| Paper ID : 1143-NICAME1402 |
| Authors: |
|
Milad Teymori omran *1, Ezzatollah Askari Asli-Ardeh1, Ali Motevali2, Ebrahim Taghinezhad3 1Department of Biosystems Engineering, University of Mohaghegh Ardabili, Ardabil, Iran; 2Department of Biosystem Engineering, Sari Agricultural Sciences and Natural Resources University, Sari,iran 3Moghan College of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil |
| Abstract: |
| Convection dryers are practical in post-harvest industries. The long drying process by convective method reduces the quality of the final product. In this research, drying kinetics and bioactive compounds remaining in the final product were investigated by performing the combined drying process by convection and infrared dryers with three different methods. For this research, there are three combined drying methods, the first method is simultaneous drying (HA-IR), the second method is two-stage drying, so that the first stage is hot air and then infrared (HA+IR), and vice versa in the third method (IR+HA) was used. Experiments were performed at 3 levels of temperature (40, 55, 70 °C) and 3 levels of radiation intensity (250, 500, 750 W/m2). The results of this research showed that the shortest drying time was 80 minutes which was obtained in the (HA70-IR750) method. Among the examined models, the Midili model was more accurate in predicting the process of exiting moisture from the product. The highest amounts of total phenolics (8.50 mg GAE/g) and total flavonoids (7.17 mg CE/g) were obtained in the HA70-IR750 method, and the highest amount of antioxidant activity (67.88%) was obtained in the HA70-IR500 method. |
| Keywords: |
| Drying, apples, modeling, bioactive compounds, hot air-infrared |
| Status : Paper Accepted (Poster Presentation) |
