ArticleScientific reports2025
Ultrasound-assisted osmotic dehydration pretreatment enhances drying kinetics, quality attributes, bioactive compounds, microstructure, FTIR profiles, and sensory properties of Litchi.
Article in Scientific reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
This study optimized ultrasound-assisted osmotic dehydration (USOD) as a pretreatment for convective drying of litchi quarters. Response Surface Methodology identified optimal conditions at 34.79% ultrasound amplitude, 30 min sonication, and 40% (w/w) sucrose, resulting in 23.76% predicted water loss and 3.89% solid gain, with experimental values showing less than 6% relative error. USOD pretreatment reduced drying time by 18% compared to control samples. The logarithmic model provided the best fit for drying kinetics in both USOD-pretreated and control samples, while the effective moisture diffusivity of USOD-pretreated samples increased by 39.58% compared to the control. USOD pretreated samples showed significantly (P < 0.05) higher lightness(L*:46.69), greater phenolic retention (10.72 mg GAE/g), and enhanced radical scavenging activity (56.47%). In addition, USOD pretreated samples showed significantly (P < 0.05) lower hardness (4.7 N), higher rehydration ratio (2.89), and superior sensory acceptability (7.4). Scanning electron microscopy of USOD-pretreated samples revealed noticeable microstructural alterations compared to fresh and control samples. FTIR analysis further confirmed better antioxidant preservation. Unlike previous studies that have largely focused on conventional or single-technique pretreatments, this work uniquely demonstrates the combined optimization of USOD as a novel pretreatment for litchi prior to hot air drying, while also establishing its link to microstructural modifications and FTIR-based confirmation of antioxidant preservation.
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