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Explain the process of Freezing
Freezing, as a method, is the easiest, most convenient and least time-consuming way of preserving foods. Freezing does not sterilize foods or destroy the organisms that cause spoilage. How then does it preserve foods? Well, the extreme cold simply slows the growth of microorganisms and the chemical changes that affect quality or cause spoilage. You already know that all microbial and biochemical activities are temperature dependant and slow down as the temperature is reduced. As a rule of thumb, for every 10°C temperature change, the rate of reaction changes by a factor of 2 to 3. Further, freezing helps to preserve food by its action on enzymes. Enzymes, as you already know are complex proteins, present in all living tissue, that help organisms ripen and mature. During freezing, enzyme action is slowed but not stopped. If not inactivated, these enzymes can cause color and flavor changes and loss of nutrients during freezer storage. We are all familiar with chilling and refrigerated storage. At home or at the industry level, refrigerated storage of food is generally practiced. In the unit operation of chilling, the temperature of a food is reduced generally to between -1°C and 7 °C and thus subsequent storage at refrigerated temperature extends the shelf life of both the fresh and processed foods. It is also used as an adjunct process to extend the storage life of mildly processed (e.g. pasteurized, fermented and irradiated) and low-acid foods. In the United States, refrigerated storage of food is mandated by regulations at temperatures at or below 7.2°C. Such foods are also marketed under refrigeration and labeled as 'needing refrigeration'. Commercially sterilized and processed foods that may become contaminated after opening should also be labeled for refrigerated storage. Chilling and refrigerated storage prevents the growth of bacteria, particularly the thermophiles (organisms that grow at high temperature) and mesophiles (organisms that grow at medium temperature). Psychrophiles (organisms that grow at low temperatures), however, can and do cause food spoilage during low temperatures storage, but there are some psychrophillic pathogens.
Explain Rh Blood Grouping System Some individuals also have a so called Rh antigen on the surface of their RBCs. Those who have it are called Rh (+) and those who do not have i
what would i need to do to achieve a 7C in science , KS3??
how the metal tyre is fitted on the wheel of a bullock cart?
Explain the History and Milestones of the Concept of Blood In this section, we will discuss about the historical development of the concept of blood and blood cells. This discu
why- 1) alcoholic acidity is determined? 2) ash content is important factor in wheat flour? 3)carbohydrates and sugar are separately denoted on pachaging material?
During which equinoxes are day and night of equal length around the world: Autumnal And Vernal Equinoxes
Filtration as a method of separation can be used for mixtures that are
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#question.I AM TRAYING TO DO A SCIENCE PROJECT FOR 7TH GRADE BUT I DONT KNOW WHAT SHOULD I DO ?
Define the Rate and Depth of Breathing Do you know what the normal rate of breathing in adults is and what are the factors on which it depends? Well, the normal rate of respira
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