@article{Pourebrahim_Elhamirad_Einafshar_Armin_2020, title={Thin layer drying models, antioxidative activity and phenolic compounds of rose petals (Rosa damascena Mill.) in tray dryer}, volume={12}, url={https://ijbch.kaznu.kz/index.php/kaznu/article/view/399}, DOI={10.26577/ijbch-2019-i2-19}, abstractNote={<p><span class="fontstyle0">The drying behavior of the Damask rose (</span><span class="fontstyle2">Rosa damascena </span><span class="fontstyle0">Mill.) petals in a thin layer hot air drying at 35, 45 and 55°C and 0.4, 1.2 and 2 (m·s</span><span class="fontstyle0">-1</span><span class="fontstyle0">) air velocity levels, was investigated. The Midilli was the most suitable model among 14 different thin-layer models for showing the thin-layer drying characteristics. At the experimental temperature (35-55°C) and air velocity levels (0.4, 1.2 and 2 m·s</span><span class="fontstyle0">-1</span><span class="fontstyle0">) the effective moisture diffusivity was 2.02×10</span><span class="fontstyle0">-12</span><span class="fontstyle0">- 11.3×10</span><span class="fontstyle0">-12 </span><span class="fontstyle0">(m</span><span class="fontstyle0">2</span><span class="fontstyle0">·s</span><span class="fontstyle0">-1</span><span class="fontstyle0">) and the activation energy varied from 56.3 to 64.5 (kJ·mol</span><span class="fontstyle0">-1</span><span class="fontstyle0">). Total anthocyanin content (TAC) ranged 77-240 (mg·L</span><span class="fontstyle0">-1</span><span class="fontstyle0">). The rose petal extracts showed higher DPPH (59.51%) and lower FRAP (1213.24 μmol(Fe</span><span class="fontstyle0">+2</span><span class="fontstyle0">)·L</span><span class="fontstyle0">-1</span><span class="fontstyle0">), at an increasing temperature from 35 to 55°C. Results showed that the higher temperature caused less TAC. At 45-55°C and air velocities 0.4-1.2 (m·s</span><span class="fontstyle0">-1</span><span class="fontstyle0">) the number of anthocyanins increased significantly, but at air velocities, 1.2- 2 (m·s</span><span class="fontstyle0">-1</span><span class="fontstyle0">) a decrease was observed.</span></p>}, number={2}, journal={International Journal of Biology and Chemistry}, author={Pourebrahim, Nasim and Elhamirad, Amirhussein and Einafshar, Soodabeh and Armin, Mohammad}, year={2020}, month={Jan.}, pages={141–149} }