Processes of separation
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Decantation: This is a method in which the supernatant is poured off carefully leaving the sediment at the bottom.
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Elutriation: This is used to separate fine insoluble powders in a suspension and then decanting.
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Straining or colation: In this the coarse solid particles are separated from liquids by pouring through a cloth.
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Dialysis: Separating crystalloids from colloids by passing though an animal membrane.
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Sifting: By this method fine particles are separated from coarse one by means of a sieve.
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Filtration: By this solid particles are separated from liquids by passing it through a finely porous material such as filter paper.
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Crystallisation: By this form drugs are converted into crystals.
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Decoloration or Decolourisation: This is usually done by treating with activated charcoal or other adsorbent.
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Clarification: This removes suspended solids by agitating the mixture by insoluble powder or adding egg albumin and boiling or by centrifugation.
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Last modified: Thursday, 26 April 2012, 8:41 AM