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Cryogenic Freezing, as you would realize, is one of the fast, flexible and cheap method of freezing. In this, the liquefied gases are placed in direct contact with the foods. Food is exposed to an atmosphere below - 60°C through direct contact with liquid nitrogen or liquid carbon dioxide or their vapor. This is a very fast method of freezing, thus adequate control is necessary for achieving quality products. It also provides flexibility by being compatible with various types of food products and having a low capital cost. The rapid formation of small ice crystals greatly reduces the damage caused by cell rupture, preserving color, texture, flavor and nutritional value. The rapid freezing also reduces the evaporative weight loss from the products, provides high product throughput and has low floor space requirements. The cryo-mechanical technique utilizes a cryogenic gas to create a frozen crust on a fluid product, after which the product may be conveyed to a conventional mechanical freezer. The advantages of liquid nitrogen are that it is colorless, odorless and is chemically inert and boils at 195.8°C. It is usually used for high-value products due to the high capital cost for gas compression. The product can be exposed to a cryogenic medium in three was:
(a) The cryogenic liquid is directly sprayed on the product in a tunnel freezer. (b) The cryogenic liquid is vaporized and blown over the food in a spiral freezer or batch freezer. (c) The product is immersed in the cryogenic liquid in an immersion freezer.
describe the factors which decide the broad area of scientific activity
is perkin''s condensation possible in aliphatic aldehyde?
What ways can igneous rock form two ways? Igneous rocks are formed when melted material crystallizes, e.g. from magma.
Define Solute-Solvent Interaction A solution, as you may already know, is a mixture of solute (present in small amount) and solvent (present in large amount). The interaction b
Nucleic acids are polymers of nucleotides. Nucleotides are nucleoside phosphates.
Why is there more exchangeable calcium than potassium on clay/humus colloid? Calcium is usually abundant except in acid soils which occur in humid area due to excessive leaching.
to study the presence of aroma taste,ph value and tannic acid of diffrent tea leaves
Q. What is the major source of fresh water in the city/town/village where you live? Answer : River is a major source of fresh water.
Interstellar and Intergalactic Space: The space between the stars and the galaxies looks empty, doesn't it? But this 1s not true. In the great dark between stars in the galaxie
methods of heat transfer
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