Antioxidant activity of fruit raw material during freezing and vacuum dehydration
Annotation
The paper deals with the changes in the mass fraction of vitamin C and antioxidant activity of apple puree during freezing and dehydration at different vacuum levels. The greatest reduction of the parameters in question (18-20%) is shown to occur in intense evaporation at vacuum. Then the process is decreasing. A comparative evaluation of vitamin C mass fraction and the antioxidant activity of the samples dried by different variants of dehydration (freeze drying, vacuum drying and the combination of these modes) is made. In the combined process of dehydration indicator values are shown to remain approximately at the same level as those of the sample dried by freeze-drying. The experiments have confirmed that the vacuum dehydration of fruit raw material by combination of traditional freeze-drying and vacuum drying processes allows both to reduce power consumption and to obtain a high quality product.
Keywords
Постоянный URL
Articles in current issue
- Prevention of Diabetes through use of Hypoglycemic Chinese Herbs
- New method of two-stage air and water vaporizing rotational cooling of food being preserved in glass container
- Technological aspects of food soy dresser preservation
- Changes of beef protein fraction in "freezing–storage–heat treatment" cycle
- Transformation's kinetic reaction of organic acids during the cold storage of Tangor (Ortanique)
- Different applications of cylinders with cryogenic filling*
- Design of systems of drainage of air of refrigerators
- Study of short low temperature range heat pipes. Part 1. Experimental and numerical studies
- The dimensionless characteristics of centrifugal compressor stage axial-radial impeller
- Reserving components of the blood and hematopoietic cells using low temperatures: current status and prospects for implementation in the interests of victims in emergency situations
- Experimental research on thermoelectric system for thermal impact on particular zones of human arm
- The thermal conductivity measurements at very low density of 1.1.1.2–Tetrafluoroethane (HFC-134а)
- Thermo-induced variation of pressure in cryogenic systems
- Efficiency of quadratic turbulence models application for separated flows simulation in technological aggregates
- The second virial coefficient of difluoromethane