Efficient and hygienic technologies for defrosting frozen foods
are under intensive development. Such technologies aim to obtain
products that are highly amenable to mechanical chopping and
other processes in industrial applications or that can be directly
consumed, as in the case of sushi, sashimi and other cold seafood
products. The meat industry uses predominantly air defrosting
and water immersion defrosting. These systems work by heating
the outer surface of the product, from which heat is transferred
to the center by conduction. Problems associated with this process
include the long defrosting time, increased microbial loads, and
reduced product yield and quality.
Methods for defrosting frozen foods include thawing (in which
the temperature of the coldest spot becomes just above the product’s freezing point) and tempering (in which the temperature of
the warmest spot becomes just below the product’s freezing point).
Various thawing and tempering methods—including high-pressure,
microwave (MW), ohmic, and acoustic heating—are currently being
researched in attempts to minimize drip during thawing and deterioration in quality
Efficient and hygienic technologies for defrosting frozen foodsare under intensive development. Such technologies aim to obtainproducts that are highly amenable to mechanical chopping andother processes in industrial applications or that can be directlyconsumed, as in the case of sushi, sashimi and other cold seafoodproducts. The meat industry uses predominantly air defrostingand water immersion defrosting. These systems work by heatingthe outer surface of the product, from which heat is transferredto the center by conduction. Problems associated with this processinclude the long defrosting time, increased microbial loads, andreduced product yield and quality.Methods for defrosting frozen foods include thawing (in whichthe temperature of the coldest spot becomes just above the product’s freezing point) and tempering (in which the temperature ofthe warmest spot becomes just below the product’s freezing point).Various thawing and tempering methods—including high-pressure,microwave (MW), ohmic, and acoustic heating—are currently beingresearched in attempts to minimize drip during thawing and deterioration in quality
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