Unorganised Plant Drugs

The unorganised drugs consist of some natural substances, which are derived from plants and animals by a number of extraction processes like incision, decoction, expression, distillation and percolation or...

Storage and Preservation of Plant Drugs

Most plant drug undergoes a period of storage before they are finally used by industries to prepare pharmaceutical and medicinal product. During this period many undesirable changes may occur...

Microscopy in Pharmacognosy

Microscopy is one of the most important techniques employed in pharmacognosy for the study and identification of crude drugs. Microscope is the principal instrument used in this technique. Toe microscope...

Construction of a Compound Microscope

The microscope, essentially the compound microscope, which produces high magnification, is basically made by using two convex lenses of short focal length. They are arranged vertically on a common...

Microscopical Measurements and Drawing to scale

Microscopical measurements or micrometry and drawing to scale are of significant value in the examination of crude drugs, particularly in differentiating an authentic drug from an adulterant, which may...

Microscopical Techniques for Crude drug Analysis

Microscopic analysis of crude drugs is done mainly for the determination of (a) the size, shape and relative position of different cells and I tissues; (b) the chemical nature...