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

What is enhancers , While  various  positive  control  components  li...

While  various  positive  control  components  lie  close  to the  gene  they  regulate additional can be situated long distances away (sometimes 10-50 kb) either upstream or downs

Examples on some plants species, examples on woody perennial Angiosperm spe...

examples on woody perennial Angiosperm species and herbaceous annual angiosperm species. thanks

Biological valves, Biological Valves :  Biological valves are available fo...

Biological Valves :  Biological valves are available for all positions. For mitral position they are usually mounted on a stent (stent mounted) whereas for aortic position they ma

Explain the alterations occurring in egg, Alterations occurring in egg ...

Alterations occurring in egg The quality, flavour, composition and functional properties of eggs are adversely affected more rapidly and to a greater extent by the speed and co

What are fossil fuels, Q. What are fossil fuels? The Fossil fuels like ...

Q. What are fossil fuels? The Fossil fuels like coal, oil and gas, form when organic material is preserved from the complete action of decomposers, generally buried deep and un

Does the environment exert an influence on the phenotype, Does the environm...

Does the environment exert an influence on the phenotype? The phenotype may be altered (compared to the original situation conditioned by its genotype) by nongenetic means, ins

Hemicryptophytes - classes of life form, Hemicryptophytes - Classes of Life...

Hemicryptophytes - Classes of Life Form In this case the perennating buds or organs are situated at the soil surface where they are protected by soil and fallen leaves. These

Which is most likely be fatal to marin fish populations, If we were to comp...

If we were to completely eliminate one group of marine organisms from ocean, which would most likely be fatal to Marin fish populations? Elimination of: a) Starfishes b) Dia

Risk analysis - definition of hazard, Risk analysis - Definition of Hazard ...

Risk analysis - Definition of Hazard Hazard   :  A  biological, chemical  or  physical  agent  in or property  of food that might be have an adverse health effect.

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