Allium Cepae Extract

Allium Cepae Extract

Total polyphenol and main flavonoid antioxidants in different onion (Allium cepa L.) varieties.

In onion, spiraeoside (quercetin-4′-O-β-D-glucoside), rutin and quercetin and 3 other not identified compounds were found as the major constituents. Significant cultivar differences were found. The most abundant compound was spiraeoside (32 234 mg/kg DM in red onion, 23 283 mg/kg DM in yellow onion and 265 mg/kg DM in white onion).

During storage, an increase in flavonoids could be observed, especially at a laboratory temperature compared to storage at a lower temperature.

Spiraeoside,
Synonym(s): Quercetin 4'-glucoside. Spiraein. Spiraeoside. Spireoside
Chapman Hall Number: KWD91-S
CAS Registry Number: 20229-56-5
Type of Compound Code(s): VK5250
Molecular Formula: C21H20O12
Molecular Weight: 464.382
Accurate Mass: 464.09548
Percentage Composition: C 54.32%; H 4.34%; O 41.34%
Biological Source: Isol. from Spiraea ulmaria and other plant spp.
Physical Description: Yellow needles (MeOH aq.)
Melting Point: Mp 240-241 (209-210).

We use the red onion for extraction, which contains the highest spiraeoside.