Successfully reported this slideshow.
COLUMN
CHROMATOGRAPH
PROCEDURE
Hussain Ali 11-ARID-441
o Plug a Pasteur pipet with a small amount of cotton.
o Use a wood applicator stick to tamp it down lightly.
o Take care t...
Step 1: Prepare the column
Step 1: Prepare the column
Step 1: Prepare the column
When properly packed, the silica gel fills the
column to just below the indent on the
pipet.
Th...
Step 2: Pre-elute the column
 Add solvent to the top of the silica gel
 The solvent flows slowly down the column
 Monit...
Step 2: Pre-elute the column
Step 3:
Load the sample onto the silica gel column
 The sample to be purified is dissolved in a small amount of solvent, ...
Step 3:
Load the sample onto the silica gel column
Step 4: Elute the column
 Force the solvent through the column by pressing on the top of the Pasteur pipet with
a pipet b...
Step 4: Elute the column
Step 5:
Elute the column with the second elution
solvent
 As soon as the colored compound begins to elute, the collection...
Step 5:
Elute the column with the second elution
solvent
Step 6: Analyze the fractions
If the fractions are colored then
you can simply combine like-colored fractions,
Column chromatography
Upcoming SlideShare
Loading in …5
×

Column chromatography

3,299 views

Published on

Published in: Technology, Business
  • Be the first to comment

Column chromatography

  1. 1. COLUMN CHROMATOGRAPH PROCEDURE Hussain Ali 11-ARID-441
  2. 2. o Plug a Pasteur pipet with a small amount of cotton. o Use a wood applicator stick to tamp it down lightly. o Take care that you do not use either too much cotton or pack it too tightly. You just need enough to prevent the adsorbent from leaking out. o Add dry silica gel adsorbent, 230-400 mesh. o Usually the jar is labeled "for flash chromatography." o One way to fill the column is to invert it into the jar of silica gel and scoop it out... o Then tamp it down before scooping more out o Another way to fill the column is to pour the gel into the column using a 10 mL beaker Step 1: Prepare the column
  3. 3. Step 1: Prepare the column
  4. 4. Step 1: Prepare the column
  5. 5. Step 1: Prepare the column When properly packed, the silica gel fills the column to just below the indent on the pipet. This leaves a space of 4-5 cm on top of the adsorbent for the addition of solvent. Clamp the filled column securely to a ring stand using a small three-pronged clamp.
  6. 6. Step 2: Pre-elute the column  Add solvent to the top of the silica gel  The solvent flows slowly down the column  Monitor the solvent level, both as it flows through the silica gel and the level at the top  But make sure it does not go below the top of the silica  When the bottom solvent level is at the bottom of the column  The pre-elution process is completed and the column is ready to load
  7. 7. Step 2: Pre-elute the column
  8. 8. Step 3: Load the sample onto the silica gel column  The sample to be purified is dissolved in a small amount of solvent, such as hexanes, acetone, or other solvent.  This solution is loaded onto the column  In this case, if you use the wet method of column loading  It is critical that you only use a few drops of solvent to load the sample
  9. 9. Step 3: Load the sample onto the silica gel column
  10. 10. Step 4: Elute the column  Force the solvent through the column by pressing on the top of the Pasteur pipet with a pipet bulb  The colored bands will travel down the column as the compound is eluted  Only force the solvent to the very top of the silica  Do not let the silica go dry  Add fresh solvent as necessary.  The colored bands will travel down the column as the compound is eluted.
  11. 11. Step 4: Elute the column
  12. 12. Step 5: Elute the column with the second elution solvent  As soon as the colored compound begins to elute, the collection beaker is changed  The process is complicated if the compound is not colored  In such experiments, equal sized fractions are collected sequentially  carefully labelling is necessary for later analysis
  13. 13. Step 5: Elute the column with the second elution solvent
  14. 14. Step 6: Analyze the fractions If the fractions are colored then you can simply combine like-colored fractions,

×