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.
20 May 2024
A 2023 consumer study that surveyed over 2,000 consumers found that the key factors continue to be quality and flavour. However, once the retail price reaches $4.50 per pound, sales begin to decline.
06 Sep 2023
A phosphorus deficiency has been found to have a positive impact on antioxidant activity and phenol composition. At the same time, however, it leads to an increase in the activity of respiration rates, resulting in a decrease in conservation potential.
23 Jul 2025
The 2025 Veronese Hill Cherries season ends with a 30–40% drop due to bad weather, yet market results are positive. Quality, local identity and the push for PGI certification strengthen the product’s position and recognition in national and international markets.
23 Jul 2025
A Turkish study evaluates the effect of vegetative cherry rootstocks on flowering, pollination and fruit quality. Gisela 5 and MaxMa 60 show top results. A strategic insight for modern cherry growing and the export of “0900 Ziraat” variety.
