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), 2. Rutin 3. Quercetin
Spiraeoside: 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.