Application of pretreatment methods such as ultrasound and edible coatings is used to reduce processing time and/or preserve food product quality in drying technology.
The aim of this research from Department of Food Science and Technology, Bu-Ali Sina University, Hamedan (Iran), was to measure the impacts of gum-based coatings (guar, sodium alginate, and basil seed gums) in combination with sonication before drying on total phenolic content (TPC), antioxidant capacity (AC), effective water diffusivity (Deff), total color difference (ΔE), surface shrinkage (SS), and rehydration ratio (RR) of sour cherries.
Ultrasonic pretreatment (40 kHz, 150 W, at 25 °C, for 12 min) increased the TPC, AC, Deff, and RR, and decreased the drying time, ΔE, and SS values of sour cherries. Edible coating increased the TPC, AC, drying time, and RR, and decreased the Deff, ΔE, and SS values of sonicated sour cherries.
The TPC for untreated, uncoated-sonicated, guar gum-coated, sodium alginate-coated, and basil seed gum-coated sour cherries were 2965.9, 3398.1, 3480.8, 3511.0, and 3898.3 µg gallic acid equivalent/g dry, respectively. The highest value of AC (71.2±3.7 %) was observed on coated sour cherries by basil seed gum.
The experimental data for drying curves were fitted to several widely used models, and the Midilli model using the experimental constants that best represent the drying rate of sour cherries.
The edible coatings significantly reduced the color changes and shrinkage of dried sour cherries, with the lowest ΔE and SS values in the basil seed gum-coated samples (p < 0.05).
Fonte: Fakhreddin Salehi, Moein Inanloodoghouz, Effects of gum-based coatings combined with ultrasonic pretreatment before drying on quality of sour cherries, Ultrasonic Sonochemistry, vol. 100, 2023, https://doi.org/10.1016/j.ultsonch.2023.106633.
19 Jun 2025
Regina cherries for export to China need targeted postharvest treatments to retain premium quality. This Chilean study explores the use of natural elicitors to reduce internal browning and improve firmness and flavor throughout cold storage and long-distance transport.
17 Nov 2023
Not a greenhouse, not traditional rain covers, but a new cultivation system: Cravo Equipment LTD has recently introduced the Automatic Auto-Dry Rain Shelter to the market, which is a cover system with retractable roof and walls, automated.
20 Jan 2026
Chilean Santina cherries have officially been classified as a low glycemic index (GI=39) food. This result opens new doors for nutrition-focused marketing and reinforces cherries' status as a healthy, smart fruit choice for consumers aiming for a balanced and low-GI diet.
20 Jan 2026
China now absorbs 93% of Chile’s cherry exports, making them the country’s second most exported product after copper. Thanks to direct sea routes, improved logistics, and lower prices, Chile is boosting its position as a global leader in agri-food trade with China.
