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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.
Explain the Histotoxic Hypoxia It is a type of hypoxia in which due to the action of a toxic agent oxidative enzymes are poisoned hence the tissue cells cannot utilize oxygen s
Explain Dyes for Measurement of Plasma Volume: A number of dyes, commonly known as 'vital dyes', have the ability to combine with proteins. When such a dye is injected into the
Why did the continents spread apart? This is because of the heat generated from the earth's interior and earthquakes - the convection currents deep within the earth due to the
what is the example of compressional wave
How big is the Earth? The Earth size : is neither the largest nor smallest planet in our solar system. It is the largest of the non-gaseous planets (Mercury, Venus, Mars, and
What are three adaptations that help humans be differential survivable and three adaptations that help humans be differential fecundic
Primary processing of pulses Dry pulse seeds have a tight and fibrous seed coat (husk or skin) that envelops the cotyledons, which often is indigestible and may have a bitter
Water pressure changes with depth Use the funnel and manometer which you made in the last experiment. Fill a tall glass jar or pail with water. Calculate the pressure just belo
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Define Hypoparathyroidism Hypoparathyroidism or a decrease in the secretion of parathormone causes an upset in calcium metabolism. Hypocalcemia develops and the muscles go into
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