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EXPERIMENT 4: COLUMN CHROMATOGRAPHY AND THIN …

EXPERIMENT 4: COLUMN CHROMATOGRAPHY AND THIN LAYER CHROMATOGRAPHY THE SEPARATION, ISOLATION AND ANALYSIS OF THE DIFFERENT COMPONENTS IN A MIXTURE. GRAVITY COLUMN CHROMATOGRAPHY USED TO SEPARATE (AND THUS PURIFY) THE COMPONENTS OF A MIXTURE (PAPRIKA PIGMENTS). SEPARATION IS ACHIEVED BY PARTITIONING THE COMPONENTS BETWEEN A STATIONARY PHASE AND A MOBILE PHASE. STATIONARY PHASE MOBILE PHASE SILICA GEL ORGANIC SOLVENTS COLUMN CHROMATOGRAPHY : PREPARATION HALF FILL THE COLUMN WITH HEXANE, THEN ADD ~ 4g OF SILICA GEL WHILST GENTLY TAPPING THE COLUMN . COLUMN CHROMATOGRAPHY : TROUBLESHOOTING IF THE SILICA GEL GETS STUCK WHEN LOADING THE COLUMN , REMOVE IT FROM THE CLAMP, COVER THE OPEN END, SHAKE. RETURN TO UPRIGHT POSITION, ALLOW TO SETTLE. COLUMN CHROMATOGRAPHY : PREPARATION DRAIN THE EXCESS HEXANE FROM THE COLUMN UNTIL THE TOP SURACE OF THE SILICA GEL JUST BEGINS TO DRY.

instead of a column the adsorbent is coated on . a strip or plate of glass, plastic or aluminium. instead of travelling down the adsorbent, as in column chromatography, the solvent and the . compounds travel up the plate by capillary . action.

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