Thin Layer Chromatography (TLC)-Animation- Chromatographie sur Couche Mince (CCM)

Scientific Concepts

• Thin Layer Chromatography (TLC): A method for separating and identifying compounds in a mixture.
• Mobile Phase: A solvent or mixture of solvents that moves up the TLC plate.
• Stationary Phase: A plate coated with an adsorbent material (e.g., silica gel, aluminum oxide, or cellulose).
• Capillary Action: The process by which the solvent moves up the plate.
• Differential Partitioning: Separation of components based on their affinity for the mobile and stationary phases.
• Retention Factor (RF): A value calculated by dividing the distance traveled by a compound by the distance traveled by the solvent front.

Methodology

• Draw a pencil line 1.5 cm from the bottom edge of the TLC plate.
• Label the plate to mark the original position of the sample drop.
• Apply a small drop of the sample mixture and known compounds on the baseline.
• Place the TLC plate in a chamber with solvent, ensuring spots do not touch the eluent.
• Allow the solvent to rise by Capillary Action until it nearly reaches the top of the plate.
• Remove the plate before the solvent front reaches the top and mark the solvent front.
• Dry the plate in ambient air or with warm air.
• Visualize the spots under UV light or with chemical reagents if the compounds are colorless.
• Mark the positions of the spots and calculate the RF values.
• Compare RF values of unknown compounds with known standards to identify components.

Visualizing Agents

• Iodine
• Ninhydrin
• Potassium permanganate
• Vanillin

Researchers/Sources Featured

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