Chromatography

Chromatography Is A Lab Technique Used By Scientists To Separate And Analyze Components Of A Mixture. Chemists Use Chromatography To Analyze A Wide Variety Of Substances, Including Proteins, Dyes, And Hormones. Chromatography Can Be Divided Into Several Types Such AsThin-Layer Chromatography (TLC), High-Performance Liquid Chromatography (HPLC), And Gas Chromatography (GC). Paper Chromatography Is One Of The Oldest And Most Popular Methods Of Chromatography That Uses Small Strips Of Sorbent-Coated Paper To Separate Different Substances. The Sample Is Spotted And The Paper Is Placed Into A Solvent That Flows Up The Paper. Since Different Substances In The Sample Will Travel At Different Speeds Up The Paper, Separation Occurs As They Become Distributed Across The Paper. This Technique Is Particularly Useful For Visualizing And Verifying The Mixtures Of Different Dyes Or Amino Acids. Thin-Layer Chromatography (TLC) Is More Efficient Than Paper Chromatography And Uses A Thin Layer Or Plate Of Adsorbent Material, Such As Silica Gel. The Sample Is Spotted And A Solvent Is Drawn Up The Plate. As In Paper Chromatography, Different Components Of The Sample Are Separated Out And Distributed Across The Plate Due To Differences In Their Rates Of Adsorption By The Adsorbent. High-Performance Liquid Chromatography (HPLC) Is A Much More Powerful Method Of Chromatography That Uses A Specialized Column Filled With A Packing Material To Separate Substances. HPLC Works By Using Pumps To Force A High-Pressure Stream Of Solvent Through The Adsorbent Column With The Sample In It.