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

Kinetic energy, How might temperature changes in the human body have an imp...

How might temperature changes in the human body have an impact on human health

Define hybridization, The distribution of electrons into Hybrid orbitals is...

The distribution of electrons into Hybrid orbitals is as per the Paulis Exclusion principle and the Hunds rule of Maximum Multiplicity.

Determine the concentration of ions, 1.  Express 95 mg/l of Ca 2+ as milli...

1.  Express 95 mg/l of Ca 2+ as milligrams per liter of CaCO 3 . 2.  Express 221 mg/l of Ca(HCO 3 ) 2 as equivalents per liter of CaCO 3 . 3.  Determine the concentration o

What is dielectric strength, What is dielectric strength Dielectric st...

What is dielectric strength Dielectric strength-  It's the maximum voltage/field gradient (voltage per unit thickness) which the dielectric can withstand without failure/brea

Determine the acid value and free fatty acids, Q. Determine the acid value ...

Q. Determine the acid value and free fatty acids? This activity will help you to: • know the acidity in given sample of fat/oil, and • determine the free fatty acid com

Determine the standard molar reaction enthalpy, Table lists data for water,...

Table lists data for water, crystalline sodium thiosulfate pentahydrate, and several sodium thiosulfate solutions. Find āH to the nearest 0.01 kJ for the dissolution of 5.00 g of

Cu2+ will have the following electronic configuration, Cu 2+ will have the...

Cu 2+ will have the following electronic configuration: (1) 1s 2 , 2s 2 , 2p 6 , 3s 2 , 3p 6 , 3d 10 , (2) 1s 2 , 2s 2 , 2p 6 , 3s 2 , 3p 9 , 4s 1     (3) 1s 2 , 2s 2 ,

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