Page 251 - Pharmacognosy 2 PG303

Pharmacognosy-2 (PG303) Level 2 Clinical Pharmacy-Pharm D

an, annulation; b, bud; bk, bark; c, cambium; ck, cork; p, pith;
ph, phloem, sc, scar of a side root; w, wrinkles; xy, xylem.

A- Gentian root. T.S.; a, cortex; b, sieve tubes of phloem; e, companion
cell; d, cambium e, xylem vessels; f, wood parenchyma; g.
interxylary phloem.
B- T. cut in xylem part; a, xylem vessels; b, wood parenchyma with
acicular crystals.
Powder
Powdered Gentian is light brown to yellowish-brown. It is characterized by:
1- Abundant fragments of thin or thick-walled parenchyma, with minute
acicular crystals of Ca OX and oily globules.
2- Fragments of yellowish-brown cork cells.
3- Few reticulate and scalariform vessels, slightly lignified.
4- Numerous minute acicular crystals of calcium oxalate, 3-6 μ long, 0.5-1 μ
wide.
5- Occasional small starch granules.
6- Sclereids and fibers are absent.

Test for Identity

208