What do you mean by dehydration, Chemistry

Assignment Help:

Q. What do you mean by Dehydration?

The word dehydration usually refers to the use of controlled conditions of heating, with the forced circulation of air/artificial dryer as compared to the use of sun drying. Dried foods have low available moisture level [low water activity (aw)] so that the microorganisms cannot grow and enzyme activity is controlled. Water activity refers to the amount of unbound or "free" water in a system available to support biological and chemical reactions.

Dehydration processes are used commercially for many foods including dried milk, coffee, tea, fruit mixes, dried fruits, vegetables, meat, fish etc. Although the process of drying lowers water activity (aw) so as to hinder the growth of microorganisms however, this technique of preservation is also requiring certain pre-treatments like blanching and sulfuring. You are already familiar with the term blanching. We shall learn about sulfuring in the next sub-section. Here let us now look at the advantages of drying.

Advantages of drying

Drying has been attributed with advantages of weight reduction, ease of packing, storage and transportation. However, loss of colour, texture and nutritive value has also been observed in this process.


Related Discussions:- What do you mean by dehydration

Vulcanization of rubber - polymer, Vulcanization of rubber The procedur...

Vulcanization of rubber The procedure of heating natural rubber with sulphur to enhance its properties is known as vulcanization. Vulcanization was illustrated by Charles Goody

Electrochemical methods of analysis, potential sources of error associated ...

potential sources of error associated with coulometric titrations

Extraction of copper , how many process there are to extracte copper from c...

how many process there are to extracte copper from copperpyrites/

Kinetic particle theory, 2 thermometers, A and B, are wrapped in pieces of ...

2 thermometers, A and B, are wrapped in pieces of gauze. The gauze around thermometer A is moistened with water and the gauze around thermometer B is moistened with Ether(a volatil

Nuclear chemistry, Why the lest packing fraction havig higj of the binding ...

Why the lest packing fraction havig higj of the binding energy

Organic chemistry, illustrate edman degradation and explain its importance

illustrate edman degradation and explain its importance

Poisnous gases released during burning of the plastic , What are the major ...

What are the major poisnous gases released during burning of the plastic substances? Ans) It is high time that we start taking concrete steps in order to prevent pollution or else

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd