Preserving foods, Biology

Assignment Help:

One of man's oldest methods of preserving foods is drying or desiccation. The preservation of foods by drying is a direct result of removal of moisture. Microorganisms need water for growth. The exact amount of water needed for growth of microorganisms varies. This water requirement of microorganisms is best expressed in terms of available water or water activity aw, the vapour pressure of the solution (of solutes in water in most foods) divided by the vapour pressure of the solvent (usually water). Thus aw, for pure water would be 1.00. The water activity depends on the number of molecules and ions present in solution, rather than their size. Thus a compound like sodium chloride, which dissociates into two ions in solution, is more effective at reducing the water activity than a compound like sucrose on mole-to-mole basis.


Related Discussions:- Preserving foods

Cardiac transplantation, For patients with end-stage heart failure, cardiac...

For patients with end-stage heart failure, cardiac transplantation has become a promising therapy especially with the advent of  immunosuppressive therapy and more careful screenin

Bacteria, wine turns sour beause of the action of which bacteria? aerobic o...

wine turns sour beause of the action of which bacteria? aerobic or anerobic?

Define transcription phase of gene expression process, Define Transcription...

Define Transcription Phase of Gene Expression Process? Transcription is the enzyme synthesis of RNA on a DNA template. This is the first stage in the overall process of gene ex

Define water - important nutrient, Define Water - Important Nutrient? M...

Define Water - Important Nutrient? Macronutrients, you know, are those nutrients which are required in large amounts by our body namely, carbohydrates, fats and proteins. We st

Difference between rods and cones, Difference between rods and cones - ...

Difference between rods and cones - Rods Cones   1. More in number 1150 lakh   2. Outer seg. is cylindrical and contains

Explain the term viruses, Normal 0 false false false EN...

Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4

Sexology, what is meant by double penetration sex?

what is meant by double penetration sex?

Difference between self pollination and cross pollination, What is the diff...

What is the difference between self pollination and cross pollination? Which of these two modes of pollination contributes more to the plant diversity? Self pollination happens

Zoology, Protozoa general characters and classification

Protozoa general characters and classification

Classification of pollution sources, The man-made sources of air pollution ...

The man-made sources of air pollution are broadly categorized into three: Point or stationary sources:  it includes such sources which pollute at particular. Pollutants from

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