Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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.
explain industrial melanism and genetic repatterning during isolation with example
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 If a person is suffering from campylobacteriosis, he can take an antibiotic such as ciproflaxin or azithromycin. Erythro
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
what happens to the liver cell during the cell cycle
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: 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? The skin, its glands, and outgrowths form the Integumentary system. This system provides protection, sensory perception, tem
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
#question.what do u mean by parasitic habit.give account of various parasitic adoptation in animal.
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!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd