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

Developmental biology, pioneers of developmental biology and their contribu...

pioneers of developmental biology and their contribution

Aortic and pulmonary orifices, These circular orifices are located at the u...

These circular orifices are located at the upper ends of the outflow parts of the left and right ventricles respectively. The pulmonary orifice which is 3 cms, is 0.5 cm larger tha

Define fermented dairy products-butter, Normal 0 false false ...

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

Explain asystole and pulseless electrical activity, Explain Asystole and Pu...

Explain Asystole and Pulseless Electrical Activity (PEA) The outcomes from these rhythms are generally much worse than for VT/VF, unless a readily correctable cause is identif

Illustrate the electrophysiology and ion transport of cornea, Illustrate th...

Illustrate the electrophysiology and ion transport of cornea? Electrophysiology and ion transport of cornea: The trans-epithelial potential is 25-35 mV. It is almost 50 p

What are the consumer and producer surplus, What are the consumer and produ...

What are the consumer and producer surplus? Consumer and producer surplus: At equilibrium P 1 Q 1 (as point B, here demand equals supply) Consumer surplus:

INVERTEBRATES - STRUCTURE & FUNCTION, 2. Describe the respiratory organs a...

2. Describe the respiratory organs and mechanism of respiration in pila.

Explain 1st type of hypersensitivity, It is IgE mediated hypersensitivity. ...

It is IgE mediated hypersensitivity. Typical manifestations contain asthma, food allergies, eczema, hay fever etc.

Tuberculosis, Tuberculosis Tuberculosis (TB) is an ancient disease of ...

Tuberculosis Tuberculosis (TB) is an ancient disease of man, animals and birds. It is an infectious disease, characterized by slow development of tubercles in almost any organ

Define the effect of deficiency of vitamin k, Define the Effect of Deficien...

Define the Effect of Deficiency of Vitamin K? Both excess and low intakes can have serious implications on human health, although such conditions arise rarely, these can often

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