Evaluation Of Crude Drugs. Definition: - Confirmation of identity and determination of quality and purity of crude drugs is called as evaluation of crude drugs. Besides confirmation of identity and determination of quality and purity the term drug evaluation also covers detection and determination of the type of adulteration present. Methods of Evaluation : - Organoleptic evaluation. Microscopic evaluation. Chemical evaluation. Physical evaluation. Biological evaluation. 1) Organoleptic evaluation: - Examination of the drug by color, odor, shape size, taste, touch, texture, and sound is known as Organoleptic evaluation. e.g. taste of fennel is sweet. Taste of clove is pungent. Leaf of datura is hairy. While evaluating by this method there are certain restrictions like changes in shape & size of drugs during drying & packing so it is Difficult to the study the drug by organoleptic evaluation. e.g. length of the cinnamon quill is 1 meter but mostly
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