Thin-Layer Chromatography uses which of the following?

Thin-Layer Chromatography uses which of the following?

• A. Similar to paper chromatography except that a coated glass or plastic plate is used instead of paper, and the results are visualized via an iodine vapor chamber
• B. A method used to separate pigments on a membrane
• C. A technique for separating pigments on paper
• D. A type of electrophoresis

Answer: (A)

Thin-layer chromatography separates components by using a thin layer of adsorbent coated on a solid plate as the stationary phase, with a solvent moving up the plate as the mobile phase. The sample is spotted on the plate, the solvent soaks upward, and different pigments travel at different speeds because they interact differently with the coating. This produces distinct spots that reflect their relative affinities for the stationary phase versus the solvent. Visualization often uses an iodine vapor chamber, which makes the spots visible even for colorless compounds. This setup uses a coated glass or plastic plate instead of paper, unlike paper chromatography, and it is not based on electrophoresis, which relies on an electric field.

Thin-layer chromatography separates components by using a thin layer of adsorbent coated on a solid plate as the stationary phase, with a solvent moving up the plate as the mobile phase. The sample is spotted on the plate, the solvent soaks upward, and different pigments travel at different speeds because they interact differently with the coating. This produces distinct spots that reflect their relative affinities for the stationary phase versus the solvent. Visualization often uses an iodine vapor chamber, which makes the spots visible even for colorless compounds. This setup uses a coated glass or plastic plate instead of paper, unlike paper chromatography, and it is not based on electrophoresis, which relies on an electric field.