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

Chemical bonding, explain why carbon tetra-chloride does not dissolve in wa...

explain why carbon tetra-chloride does not dissolve in water?

Valence Bond Theory, What are the limitations of valence bond theory?

What are the limitations of valence bond theory?

Imparting health benefit, Q. Name the types of food in which onion or garli...

Q. Name the types of food in which onion or garlic can be used for imparting health benefit. Bakery products, imitation meats and sausages and meat pies are the types of foods

Freezing and Boiling points, Calculate the molarmass of a nonelectrolyte th...

Calculate the molarmass of a nonelectrolyte that lowers the freezing point of 25.00g of water to -3.9 degrees C when 4.27 g of the substance is dissolved in the water.

Help, While studying evolution, a student comes across a cladogram that inc...

While studying evolution, a student comes across a cladogram that includes clades like amphibia, reptilia, aves, and mammalia. What must be the basal clade?

Which of the following is always a whole number, Which of the following is ...

Which of the following is always a whole number : (1) Atomic weight             (2) Atomic radii     (3) Equivalent weight   (4) Atomic number Ans:  Atomic number

What are cell diagrams - galvanic cell, What are Cell diagrams? Conside...

What are Cell diagrams? Consider the galvanic cell depicted in Figure. This cell has a hydrogen electrode at the left and a silver-silver chloride electrode at the right. The h

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