I want to use Soxhlet method for the successive extraction of a plant material. but I don't know how long the Soxhlet extraction Should be be run in a specified solvant. i.e If I started with petroleum ether then after how many hours i may jump to the other solvant having next higher polarity ?
Nagendra Singh Chauhan
Generally when colorless in siphon tube the extraction is complete. for more accuracy randomly you can take 3-4 drops of solvent from siphon tube in watch glass and dry it. if no residue available then your extraction is completed then change to another solvent.
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Hemadri Reddy Salla
in general it depends on the polarity of the solvent, amount and volume of the solvent , usually with petroleum ether it takes almost 6-12 hrs.
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