9. Uva Ursi leaves

origin: the dried leaves of Arctostaphylos uva-ursi   Bot.

F: Ericaceae 

Active constituent:

1.     Hydroquinone derivatives (arbutin).

2.     Tannins (gallotannin)

Key element (microscopically examination):

1.     actincytic stomata(about 9cells around the stomata)present only in the lower surface.

Uses:

1.     Antiseptic, astringent and anti-inflammatory for infection of genitor-urinary tract.

2.     Diuretic

3.     Used as whitening agent for the skin in cases of hyperpigmentation disorders (↓tyrosinase enzyme →impairment of melanin synthesis).

Test for identified:                                                                                                

1.     Test for arbutin (sublimation test):                                                   place 0.1g of powdered leaf in a small crucible, moisten with dilute Hcl,cover the crucible with a microscopic slide, and heat gently→ formed a long rod crystal of hydroquinone + dilute sol. Of NH₄OH →a sol. Become gradually dark brown.

Report in the lab.

actinocytic stomata.

                                     

Chemical test

Result	Test
	Sublimation test
	With dilute ammonium hydroxide solution

Conclusion:………………………………………………………………………………………………