Paper chromatography is an analytical method used to separate coloured chemicals or substances. Erwin Chargaff credits in Weintraub's history of the man the 1944 article by Consden, Gordon and Martin with sparking his discovery of Chargaff's rules, an important precursor to Watson and Crick's discovery of the double-helix structure of DNA, for which they were awarded the Nobel Prize in Physiology or Medicine in 1962. It is now primarily used as a teaching tool, having been replaced in the laboratory by other chromatography methods such as thin-layer chromatography (TLC).Read more on Wikipedia
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