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

Determine the significance of mesoglea, Determine the significance of Mesog...

Determine the significance of Mesoglea. The jellylike layer found between endodermal and ectodermal cell layers of diploblastic organisms. It acts as a type of cement holding t

Where smooth muscle may be found in human body, a) Name three parts of the ...

a) Name three parts of the body where smooth (involuntary or unstriated) muscle may be found. b) In any one of your examples, say what the smooth muscle does.

Differences between electron acceptors and electron carriers, What are the ...

What are the differences between electron acceptors and electron carriers? Give an example of each.

Define requirements of vitamin a of infants, Define requirements of Vitamin...

Define requirements of Vitamin A of infants? On the basis of vitamin A ingested by breast fed infants in well-nourished communities, ICMR (1990) has recommended a daily allowan

Discuss about electric field, Discuss about electric field The electric...

Discuss about electric field The electric field is a vector quantity whose magnitude is the force per unit charge and points in the direction of the force on the positive test

Explain the types of surgery, Explain the Types of surgery ? Primary re...

Explain the Types of surgery ? Primary repair of ventricular septal defect has to be done whenever possible. III complex malformations associated with large VSD, pulmonary arte

Disorders of female reproductive system, DISORDER S OF FEMALE REPRODUCTIVE...

DISORDER S OF FEMALE REPRODUCTIVE SYSTEM - (i)         Sterility (ii )     Menstrual irregularity - This may be amenorrhea (absence of M.C.) or excessive bleeding (

Plants of estuary, Plants of Estuary The plants of the estuary are of ...

Plants of Estuary The plants of the estuary are of four basic types: Phytoplankton, Marginal marsh vegetation, Mud-flat algae and Epiphytic plants

What are mycotoxins, Q. What are mycotoxins? How are these produced and w...

Q. What are mycotoxins? How are these produced and where are these found? Are these naturally-occurring or produced? What is their significance? First what are mycotoxins?

What are the uses of whey protein concentrates, What are the uses of whey p...

What are the uses of whey protein concentrates? Whey protein concentrates are used extensively in the manufacture of baked goods, where they increase the effectiveness of short

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