KINGHERBS' Onion Extract aims at total polyphenol and main flavonoid antioxidants in the onion bulb. The main ingredients are as follows,
1. Spiraeoside (quercetin-4-O-β -D-glucoside),
Synonym(s): Quercetin 4'-glucoside. Spiraein. Spiraeoside. Spireoside
Chapman Hall Number: KWD91-S
CAS Number: 20229-56-5
Molecular Formula & weight: C21H20O12; 464.382
Accurate Mass: 464.09548
Percentage Composition: C 54.32%; H 4.34%; O 41.34%
Physical Description: Yellow needles (MeOH aq. )
Melting Point: MP 240-241 (209-210)
KINGHERBS choose the right species of onion, and after an intended storage in a special condition, we extract it with only grain ethanol. Thus assure the best quality.
We suggest onion paste extract instead of dry powder extract.