Study Set Content:
Uses:
is used to facilitate repigmentation in idiopathic vitiligo and for symptomatic control of severe disabling psoriasis.
The aglycone is phenolic in character
PHENOL GLYCOSIDES
Example:
Arbutin, Hesperidin, Phloridzin, Baptisin
found in uva ursi & chimaphila
Arbutin
occurs in various citrus fruits
Hesperidin
found in the root bark of rosaceous plants
Phloridzin
from baptisia
Baptisin
from Iris species
Iridin
UVA URSI or(blank) is the dried leaf of
bearberry, Arctostaphylos uva ursi (Fam. Ericacea)
Constituents:
arbutin, corigalin, pyroside, quercetin, gallic acid, elagic acid, ursolic acid
Use
diuretic, astringen
Flavonoid nucleus
Complex substances that occur as mixtures of polyphenols that are difficult to separate because they do not crystallize
TANNINS
2 CHEMICAL CLASSES
Hydrolyzabke tannins
Nonhydrolyzable tannins or condensed tannins
consists of galic acid or related polyhydric compounds esterified with glucose
Hydrolyzabke tannins
contains only phenolic nuclei example: leucocyanidin
Nonhydrolyzable tannins or condensed tannins
are non-crystallizable compound that with water forms colloidal solution possessing an acid reaction and a sharp puckering taste
Tannins
Tannins causes _____ of solutions of gelatin as well as of alkaloids
precipitation
They form_____ soluble compound with ferric salts
dark blue or greenish black
They produce a _____ with Potassium Ferricyanide and Ammonia
deep red color
