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

Ionization energy, ionization energy vary in 3d seris of d-block elements,h...

ionization energy vary in 3d seris of d-block elements,how and why

Electrochemistry, what are the value of standard oxidation and standaed red...

what are the value of standard oxidation and standaed reduction potential of water

Spin-only magnetic moment, The tris(monothiocarbamato)iron(III)complex show...

The tris(monothiocarbamato)iron(III)complex shown to the right undergoes conversion from low to high spin state  with an increase in temperature.  This can be monitored by measurin

Radiometric titration, what are the principles of radiometric titration

what are the principles of radiometric titration

Hybrid propellants - types of rocket propellants, Hybrid propellants: T...

Hybrid propellants: These propellants are the propellants which contain solid fuel & a liquid oxidiser. For instance, liquid N 2 O 4 or liquid oxidizer and acrylic rubber (s

., why we consider carbon as standared for atomic mass unit

why we consider carbon as standared for atomic mass unit

The following explains light both as a stream of particles, Which one of th...

Which one of the following explains light both as a stream of particles and as wave motion: (1) Diffraction (2) γ= h/p (3) Interference    (4) Photoelectric effect

D and f block elements, I read that in the first transition series,the stab...

I read that in the first transition series,the stability of +2 oxidation state decreases from Sc to Cu.but,I observed that as we move along the 3d -series,the stability increases i

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