Isochoric freezing: An innovative and emerging technology for retention of food quality characteristics

Freezing is a well-established and long-term food preservation method. The most commonly used conventional freezing method follows isobaric (constant pressure) approach, which causes number of irreversible nutritional, mechanical, sensorial, and microstructural changes that make food unacceptable to consumer. The current pandemic has increased demand for food products with higher nutritional and physicochemical properties. These factors have led to the development of an isochoric freezing system. Isochoric freezing has great potential to retain the quality properties of food. Understanding the concept and application of the isochoric freezing system in the food industry is necessary to investigate its effect on various quality characteristics. Thus this review presents an outline of the working principle and impact of isochoric freezing on retention of nutrients, physicochemical and bioactive compounds of food products, and highlights current challenges and future needs by considering research published in previous years. A special section also shows the applications of isochoric freezing in medical field. Practical applications Isochoric (constant volume) freezing has emerging application in the food industry because of protects preserved food from ice damage maintains its quality properties, reduces up to 70% energy consumption, has less operating cost, and is environmentally friendly. Fewer temperature fluctuations will also experience in food products stored in the isochoric system as temperature increases continuously, resulting in ice melting inside the chamber rather than heating the food product. In conclusion, the isochoric freezing system has enormous potential in food industries in retaining nutrient and bioactive compounds compared to conventional freezing techniques.