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

How the molecule would increase in mass slightly, Suppose many of the atoms...

Suppose many of the atoms of nitrogen in a double-stranded molecule of DNA, of isotope N-14, were replaced with the isotope N-15. What afffect would this have? a) The nitrogeneo

Determine biologically compatibility of implant materials, Biologically com...

Biologically compatibility od implant materials An ideal implant material will elicit mainly physiological reactions within the surrounding tissues (bone, connective tissue and

Plasma Membrane, What can I do with this topic to make it into a brochure

What can I do with this topic to make it into a brochure

Explain observations seen in thyphoid, Some observations seen in this fever...

Some observations seen in this fever are: 1.  Massive loss of  lean body mass or muscle due to tissue breakdown (250-500 g muscle tissue is lost/day) leading to excessive nitro

Hypospadias, Hypospadias Hypospadias is the most common congenital an...

Hypospadias Hypospadias is the most common congenital anomaly of the penis. In this uretheral opening is situated on ventral side of the shaft of penis in one or several posi

Flying fish pisces, the characteristics of flying fish belong to pisces

the characteristics of flying fish belong to pisces

What is the difference among sexual spores and gametes, What is the differe...

What is the difference among sexual spores and gametes? Do humans present sexual spores or gametes? Sexual spores are structures formed from meiosis with ploidy (number of chro

Collecting tubule - vertebrate kidney, Normal 0 false false ...

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

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