Why ascending method of paper chromatography is preferred, Biology

Assignment Help:

Why Ascending Method of Paper Chromatography is Preferred?

The ascending method is preferred because of the simplicity of the set up. In actual method the substance to be separated is applied as a spot in a suitable solvent with the help of a capillary tube and hot blower. The paper is then suspended vertically inside a sealed chamber to make its lower end dip into a solvent. Due to capillary action, the solvent ascends along the filter paper that forms the mobile phase, while the water held immobile by the cellulose fibres of the paper forms the stationary phase.

After the solvent front has run almost to the upper end of the filter paper, the latter is removed from the chamber and dried. The paper is then suitably stained to locate separate functions as coloured spots. Sometimes, to enhance the resolution of the spots and to verify the authenticity of the material, the chromatogram is subjected to two dimensional paper chromatography. After it is run in single dimension in one solvent system, it is dried and rotated to 900 and rechromatographed using a second altogether different solvent system. Finally the filter paper is dried and stained. The spots are better resolved after chromatography in the second dimension. In descending paper chromatography, the filter paper is suspended vertically down from the solvent chamber at the top so that the liquid and the solutes migrate down the paper.


Related Discussions:- Why ascending method of paper chromatography is preferred

taxonomy and evolution, explain industrial melanism and genetic repatterni...

explain industrial melanism and genetic repatterning during isolation with example

Define recommended dietary allowance for pyridoxine (rda), Define Recommend...

Define Recommended Dietary Allowance for pyridoxine (RDA)? Average requirements for pyridoxine vary with age, sex and physiological conditions such as protein status, pregnan

How can we control to occur campylobacteriosis diseases, How can we control...

How can we control to occur Campylobacteriosis diseases If a person is suffering from campylobacteriosis, he can take an antibiotic such as ciproflaxin or azithromycin. Erythro

Explain what is molds , Explain what is Molds ? Zygomycota, or molds, a...

Explain what is Molds ? Zygomycota, or molds, are a type of fungus made of filamentous hyphae that grow on decomposing material. The molds actually aid in the decomposition pro

The cell cycle, what happens to the liver cell during the cell cycle

what happens to the liver cell during the cell cycle

Absorption of amino acids and peptides, Absorption of amino acids and  pep...

Absorption of amino acids and  peptides Generally,  the  dietary proteins are almost comp!etely  digested to their constituent amino acids and these are rapidly absorbed  from

Disorders of lower respiratory tract, DISORDERS OF LOWER RESPIRATORY TRACT:...

DISORDERS OF LOWER RESPIRATORY TRACT: The lower respiratory  tract infections  tend to occur most frequently in young children who have not developed resistance  to infectious

Explain the integumentary system in human biology, Explain the Integumentar...

Explain the Integumentary System in human biology? The skin, its glands, and outgrowths form the Integumentary system. This system provides protection, sensory perception, tem

Theory of epigenesis - pre-mendelian theory, Theor y of Epigenesis (i)...

Theor y of Epigenesis (i)          It was proposed by C.F. Wolff & supported by Von Baer. (ii)         Wolff proposed that germ cells contain definite but undifferentiated

Parasitic adoptaion in animal, #question.what do u mean by parasitic habit....

#question.what do u mean by parasitic habit.give account of various parasitic adoptation in animal.

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