Define observation or inference for fehling's test, Biology

Assignment Help:

Define Observation or Inference for fehling's test?

An insoluble reddish brown precipitate of cuprous oxide will be obtained. The reddish brown precipitate indicates the presence of a reducing sugar. All monosaccharides are reducing sugars and give a positive Fehling's test.

Note- Sometimes you may see some yellow or greenish coloured precipitate.

Maltose and lactose have a free aldehydes group due to which they are capable of reducing Fehling's solution.

Sucrose does not possess any free sugar group since the aldehyde group of glucose molecule and the ketone group of fructose molecule are tied up in a glycosidic linkage. Hence, there is no free sugar group available for enediol formation and sucrose cannot reduce metallic ions.

Starch is made up of several glucose units linked by a-1,4 glycosidic linkages in straight chains and branched through -1,6 glycosidic linkages . Thus, it has very few free sugar groups and is not capable of reducing cupric ions in Fehling's reagent.

Dextrin is the intermediate product of starch hydrolysis and is a less complex molecule. Thus, it possesses more free sugar groups than starch and can partially reduce Fehling's reagent.


Related Discussions:- Define observation or inference for fehling's test

Central and peripheral nervous system - geriatric nutrition, Explain Centra...

Explain Central and Peripheral Nervous System - Geriatric Nutrition? Age related changes occur in various senses related to the cranial nerves-vision, hearing, taste and smell

What is gum arabic, Gum Arabic Gum Arabic or Gum Acacia is the oldest  ...

Gum Arabic Gum Arabic or Gum Acacia is the oldest  and best known of the natural gums. Gum Arabic is the natural exudate produced by various species of the thorny Acacia trees

What are prophylactic measures against hiv infection, Q. What are some prop...

Q. What are some prophylactic measures against HIV infection? The major prophylactic measures against HIV infection are: the use of condoms in sexual relations, not to share ne

Vertebrate kidney, Normal 0 false false false EN-IN X...

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

Why there is more species biodiversity in tropical latitudes, a) Giving two...

a) Giving two reasons define why there is more species biodiversity in tropical latitudes than in temperate ones. b) Name an upload drug and its source plant. How does the dr

Metabolism, METABOLISM  - Word given by Shwann . It includes bio-ch...

METABOLISM  - Word given by Shwann . It includes bio-chemical reactions occur in body may be constructive or destructive. It includes -                         Anabo

What do you mean by cori cycling, What do you mean by Cori Cycling? In ...

What do you mean by Cori Cycling? In this cycle, glucose released by peripheral tissues is metabolized to lactate, which is then resynthesized to glucose in the liver. This pro

Hard paste removal-therma-fill, Hard paste removal -    Hard setting Ca...

Hard paste removal -    Hard setting Ca(Ho) 2 paste (like Endocal 10) can be softened by EDTA and removed by file or microdebrider. -    Care must be taken not to gouge or

Describe cutaneous diffusion, Q. In arthropods why isn't gas exchange done ...

Q. In arthropods why isn't gas exchange done through cutaneous diffusion? In arthropods the impermeability of the exoskeleton makes the way of gases difficult. In addition the

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