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

Organic chemistry , factors affecting the acidity of the aromatic carboxil...

factors affecting the acidity of the aromatic carboxilic acids

Octane number - characteristics of hydrocarbons, Octane number - Characteri...

Octane number - Characteristics of hydrocarbons It is utilized for measuring the knocking character of fuel utilized in petrol engine.  The octane quantity of an offered sample

Chemsitry, Calculate how the internal energy stored in one O-H bond of H20 ...

Calculate how the internal energy stored in one O-H bond of H20 Consider the following chemical reaction H20(g)-->2H(g) + O(g) at 298.15 K and 1.00 Bar fH* [H(g)]=218.0 kJ/mole fH*

Number of nodal centres for 2s orbital, Number of nodal centres for 2s orbi...

Number of nodal centres for 2s orbital: (1) 1        (2) 0        (3) 4        (4) 3 Ans: 1

Assignment beginning, Is this a excellent beginning for my assignment Most...

Is this a excellent beginning for my assignment Most Australians who own a pool, have saltwater pools, which are basically pools where the water have salt (NaCl) dissolved into th

Drying of organic substances, Drying of Organic Substances- purification of...

Drying of Organic Substances- purification of organic compounds Several solids are dried first by pressing them gently in between folds of filter papers. Compounds that neither

Methods expressing the mathematical concentration ofsolution, what are the ...

what are the methods of expressing the mathematical concentration of solutions.?

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