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morphological, microscopical, chemical, physical, biological

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12y ago
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11y ago

1.ALOHABETICAL CLASSIFICATION

2.MORPHOLOGICAL CLASSIFICATION

3.taxonomic classification

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13y ago

Crude drugs from vegetative or animal origins are "natural substances that have undergone only the processes of collection and drying."

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Q: What are the Types of evaluation of crude drugs?
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The crude drugs can be identified on the basis of their morphological, histological, and chemical characters called drug evaluation.The different techniques involved in standardization of crude drugs areMorphological and organoleptic evaluationIt refers to the evaluation of drugs by color, odor, taste, size, shape and special features like texture. This method allows more detailed examination of a drug and their identification by their known histological characters. Microscope by the virtue of its property to magnify, permits minute sections under study to enlarge so that, leaf constants, stomatal index, palisade ratio can be determined.Physical evaluationThese are rarely constant for crude drugs, but may help in evaluation with reference to moisture content, specific gravity, density, optic rotation, refractive index, melting point, viscosity, solubility etc.Chemical evaluationIt compromises of different chemical test and assays. The isolation, purification and identification of active constituents are the methods of evaluation. Quantitative chemical test such as acid value, saponification value etc are also covered under these techniques.Biological evaluationWhen the estimation of potency of crude drug or its preparations are done by means of measuring its effect on living organisms like bacteria, fungal growth, or animal tissue, it is known as biological effect of the drug, compared to the standard drug.By these methods a crude drug can be assessed and further clinical trial can be recommended


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