Page 416 - Applied Pharmacognosy

Types of Chemical markers

• Microscopical measurements for evaluation
of crude vegetable drugs

• Microscopical measurements are used for
evaluation purposes and are particularly
useful in determining the purity and botanical
sources and identification of powdered drugs

• The most helpful dimensions are those of prominent

structures such as stone cells, fibers , pollen grains,
starch granules and crystals of calcium oxalate.