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

What are the uses of construction of a retaining wall, What are the uses of...

What are the uses of construction of a retaining wall? The retaining wall is constructed whenever space requirement do not allow the natural slope to be formed for an excavatio

Discuss refractive and response to wound functions of cornea, Discuss the r...

Discuss the refractive and response to wound functions of cornea. Refractive Function: Cornea, through its interaction with the tear film, forms a smooth refractive functi

Applications of various technologies in biotechnology, Question 1: Brie...

Question 1: Briefly explain the applications of various technologies in biotechnology. Definition of biotechnology Brief on different applications of various technolo

What is the general chemical equation of photosynthesis, What is the genera...

What is the general chemical equation of photosynthesis? Why doesn't that equation clearly show the real origin of the molecular oxygen liberated? The general equation of photo

What functions regulates by hypothalamus, Q. What functions regulates by hy...

Q. What functions regulates by hypothalamus? HYPOTHALAMUS - Main visceral control center of the body (yet small in size). Central to virtually all homeostatic control . Th

Branches of embryology, BRANCHES OF EMBRYOLOGY- 1 .       DESCRIPTIVE...

BRANCHES OF EMBRYOLOGY- 1 .       DESCRIPTIVE EMBRYOLOGY This field of embryology is associated with the morphological description of different embryonic stages in the on

What are the presumed target substrates, What are some of the presumed targ...

What are some of the presumed target substrates for cyclin-dependent kinases?

Explain ozone shield, Explain ozone shield? Name two gases that can ca...

Explain ozone shield? Name two gases that can cause damage to this shield. Give one harmful effect of this damage each on plants and animals.

Use of propionates acid in microorganisms, Q. Use of Propionates acid in mi...

Q. Use of Propionates acid in microorganisms? Propionic acid is formed from lactic acid or lactates, as a result of the bacterial action during the manufacturing of swiss chees

Dietary approach for pectic ulcer, Q. Dietary approach for pectic ulcer? ...

Q. Dietary approach for pectic ulcer? Let us now move on to understand the dietary approach. We shall begin with the nutrient requirements of the patients. However before we ta

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