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

Surgical considerations in anterior mandibular region, Surgical Considerati...

Surgical Considerations in anterior mandibular region During the harvesting of a monocortical symphyseal block of bone from the mandibular symphysis region (autogenous block bo

Why his muscles so sore and feeling weak, Yesterday, when Eric returned hom...

Yesterday, when Eric returned home from jogging, he was breathing heavily, sweating profusely, and complained that his legs ached and felt weak. He took a drink of Gatorade and too

Material - separation of amino acid by paper chromatography, Determine Mate...

Determine Materials for Separation of Amino Acids by Paper Chromatography? Petridishes (200 mm diameter) with lid, Whatman Chromatographic paper, brown paper, 500 ml separating

What are some examples of interspecific competition, Q. What are some examp...

Q. What are some examples of interspecific competition? Instance of interspecific competition are the dispute among worms, vultures, flies and microorganisms for carrion and th

Pathology of mitral regurgitation, Q. Pathology of mitral regurgitation? ...

Q. Pathology of mitral regurgitation? During left ventricular systole as the pressure rises in left ventricle, blood is pumped simultaneously both into aorta and left atrium. T

What are protozoans? explain their functions, Protozoans are microscopic in...

Protozoans are microscopic in size however some are large enough to be seen with naked eye. Microscopic organisms such as these have numerous advantages, one of which is that they

What are the cytoplasmic structures present in animal cells, Q. What are th...

Q. What are the main cytoplasmic structures present in animal cells? The main cytoplasmic structures of the cell are the centrioles, the cytoskeleton, mitochondria, peroxisomes

Define role of lipids in controlling gene expression, Define role of Lipids...

Define role of Lipids in Controlling Gene Expression? In the lipogenic pathway, the genes that encode the enzymes of the fatty acid synthase complex are co-ordinately expressed

Describes why okazaki fragments are not observed in pcr, Which of the follo...

Which of the following best describes why Okazaki fragments are not observed in PCR? A. DNA primase is used for the entire reaction therefore eliminating the production of Okaz

Define proteins required for underweight - nutritional care, Define Protein...

Define Proteins required for underweight - Nutritional Care? Proteins are required for tissue building, as well as, to take care of the daily wear and tear. Under weight indivi

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