review · Foods
Conventional freeze-drying provides notable benefits for food preservation, including extended shelf-life, distinct textures, and strong nutritional retention. However, its industrial application remains constrained by lengthy processing times, high energy demands, and substantial costs. To address these challenges, hybrid freeze-drying approaches have emerged to upgrade conventional drying systems. These hybrid methods accelerate the dehydration process and lower operational costs and energy consumption while safeguarding phytochemicals, physical structure, and sensory qualities. Evidence from comparative studies confirms that hybrid freeze-drying matches the nutritional and sensory performance of single freeze-drying systems. Furthermore, when operating parameters are optimised around energy efficiency and quality metrics, hybrid drying can outperform conventional freeze-drying, yielding finished products that closely mirror the original characteristics of the raw materials.
Freeze-drying effectively preserves taste and nutrients, but extreme energy usage makes it expensive and environmentally demanding. Hybrid freeze-drying provides a more sustainable and economical alternative. By cutting processing time and energy costs without sacrificing texture, flavour, or nutritional value, these systems help make high-quality, shelf-stable food preservation far more viable for wider industrial use.
This work informs food manufacturers and equipment designers seeking to lower the high energy and processing costs associated with food dehydration. The findings apply to the manufacture of premium, shelf-stable, and nutrient-dense foods. Given that the abstract synthesises comparative research studies, the underlying methods represent applied and tested technologies, though real-world deployment requires tailoring and optimising operating parameters to specific food structures and energy constraints.
AI-generated from the published abstract. Always read the original work before citing.
Freeze-drying is an excellent method for dehydration due to its benefits, including increased shelf-life, unique texture, and, in particular, good nutritive quality. However, the applicability of traditional freeze-drying systems in the food industry is still challenging owing to their prolonged drying duration, extraordinary energy usage, and high process cost. Therefore, the need to upgrade or develop conventional freeze-dryers for common or sophisticated food structures is ever-increasing. Enhancements to the freeze-drying process can significantly speed up drying and reduce energy consumption while maintaining phytochemicals, physical quality, and sensory attributes in final products. To overcome the downsides of conventional freeze-drying, hybrid freeze-drying methods were introduced with a great potential to provide food products at shorter drying durations, lower costs, and environmental friendliness while resulting in the same nutritive and sensory qualities as that of conventional freeze-drying in special circumstances. An overview of the most current improvements, adaptations, and applications of hybrid freeze-drying in food dehydration is given here. In this review, comparative studies are offered to characterize the drying process from the standpoint of chemical quality and sensory attributes. All the reviewed studies confirmed that the nutritional and sensory qualities of the end product can be retained using hybrid freeze-drying almost to the same extent as using single freeze-drying. It was also inferred that hybrid freeze-drying can surpass conventional freeze-drying and allow for obtaining dried products with characteristics typical of raw material if operating parameters are optimized based on product quality and energy usage.
This page summarises published work. The authoritative version sits with the publisher.
DOI: 10.3390/foods12183437
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