Explain chemical method of classification of crude drug with its merit and demerits.
Chemical method of classification of crude drug:
This type of classification is based on type of chemicals present in the drugs.
Class
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Examples
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1. Alkaloids
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Aconite, cinchona, nux-vomica, vinca, ipecac, belladonna, opium , tea
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2. Glycosides
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Digitalis, senna, squill, aloe, dioscorea, liquorice, wild cherry.
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3. Lipids
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Castor oil. Peanut oil, mustard, wool fat, cod -liver oil.
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4. Volatile oils
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Peppermint, clove, eucalyptus, valerian.
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5. Tannins
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Myrobalan, kino, catechu, galls
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6. Vitamins
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cod –liver oil, shark-liver oil
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7. Resin and resin combinations
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Benzoin, balsamof tolu, storax, asafoetida, myrrh , colophony, guggul , shellac.
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8.Carbohydrates and derived products
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Yeast, Agar, honey, starch, tragacanth, acacia, Guar gum, sterculia.
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