Explain the observation or inference for seliwanoff test, Biology

Assignment Help:

Explain the Observation or Inference for seliwanoff's test?

1. Wine or cherry red colour seen. Wine red colour confirms the presence of a ketose sugar.

Note: On overheating aldoses also give the same reaction so continuous boiling should be avoided and test tube should be heated for 30 seconds to detect fructose.

2. seliwanoff's test is specific test for ketonic groups and therefore it is positive in case of sucrose. As studied in monosacccharides, seliwanoff's reagent contains HCl. In the presence of dil. HCl, sucrose  is hydrolyzed to glucose and fructose which then responds to the test.

3. Maltose and lactose on hydrolysis do not give fructose and so do not respond to this test. Starches and dextrins are made up mainly of glucose molecules. They do not contain a ketose and do not answer seliwanoff's test.


Related Discussions:- Explain the observation or inference for seliwanoff test

Trypsin, Trypsin Trypsin is secreted by the pancreas in an inactive fo...

Trypsin Trypsin is secreted by the pancreas in an inactive form trypsinogen. It is activated by enterokinase secreted by the glands in the intestinal wall. As trypsin is forme

What is drugs, What is drugs? Intravenous access must be established. A...

What is drugs? Intravenous access must be established. Although administration of drugs through a central vein is ideal in a low cardiac output situation, it is rarely possible

Mcnaughton case and law, MCNAUGHTON'S CASE AND LAW: In 1843, McNaughto...

MCNAUGHTON'S CASE AND LAW: In 1843, McNaughton shot and  killed Sir Robert Peel's secretary Edward -Drymmond.  It was  shown  that McNaughton suffered from a number of  delusi

How pregnancy and lactation affects the bmr, How Pregnancy and Lactation af...

How Pregnancy and Lactation affects the bmr? These periods of physiological stress also has an impact on the metabolic rate. Earlier, we studied that REE is highest during the

What is moderate level of lactase activity, Q. What is Moderate level of La...

Q. What is Moderate level of Lactase activity? Intake of milk is restricted depending on the tolerance. Fermented and cooked form of milk should be preferred as it is better to

What do you mean by zoonoses, Q. What are zoonoses? What are few examples o...

Q. What are zoonoses? What are few examples of zoonoses transmitted by birds? Zoonoses are human diseases transmitted by animals. Psittacosis, a bacterial disease, cryptococcos

In the phase when the cell is not dividing interphase, Q. In the phase when...

Q. In the phase when the cell is not dividing interphase is there activity within the cell nucleus? In the interphase there is intense metabolic activity in the cell nucleus th

The right side of the container, A solute passes from higher concentration ...

A solute passes from higher concentration on the left of a container to the right side of container thru a membrane. What would happen if a second solute of lower concentration was

Explain micafungin sodium, Explain Micafungin sodium Micafungin sodium ...

Explain Micafungin sodium Micafungin sodium (Mycamine - Astellas), the second echinocandin antifungal1 to become available in the US, has been approved by the FDA for intraveno

What is biochemical composition, What is Biochemical Composition As lif...

What is Biochemical Composition As life evolved on this planet, nature selected only a few elements, and life eventually came to be based essentially on carbon compounds. Out o

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