Variable Adjuster
Chromatography: TLC & HPLC
CHROMChromatography separates mixture components based on partitioning between mobile and stationary phases. TLC uses a polar stationary phase (silica) where Rf values depend on polarity. HPLC separates compounds under high pressure through a packed column.
Whiteboard Solver Steps
Select Chromatography Mode
Choose between Thin-Layer Chromatography (TLC) and High-Performance Liquid Chromatography (HPLC).
Adjust Mobile Phase / Flow parameters
Set the mobile phase polarity (TLC) or column/flow settings (HPLC). Watch how partitioning dynamics dictate elution rates.
Analyze Retention factors / peaks
Measure Rf values on the TLC plate (Rf = spot distance / solvent distance) or calculate retention times from HPLC chromatogram peaks.
Real-World Applications & Depth
Chromatography encompasses diverse analytical techniques used to separate mixtures. Thin-Layer Chromatography (TLC) separates molecules based on partition between a polar stationary phase (silica gel) and a mobile phase solvent. Highly polar compounds adsorb strongly to the silica, migrating slower (smaller Rf). Increasing solvent polarity sweeps polar compounds further up, increasing their Rf. High-Performance Liquid Chromatography (HPLC) operates on similar partition principles under high pressure inside a packed column, where substances are detected as UV absorbance peaks at distinct retention times.
Plant Pigment Extraction
Thin-layer chromatography separations demonstrate the individual chlorophylls, xanthophylls, and carotenes present in green leaf extracts.
Pharmaceutical Purity
HPLC is the primary industrial method to verify that manufactured drug batches contain the exact therapeutic dosage and zero synthesis impurities.
Forensic Toxicology
Blood and urine samples are analyzed using gas chromatography and HPLC to screen for illicit drugs, poisons, or therapeutic drug overdoses.