离岸价格
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|Minimum Order
位置:
China
最小订单价格:
最小订单:
1 Bag
包装细节:
25kgs/drum
交货时间:
5-10 working days
供应能力:
1200 Kilogram per Month
付款方式:
Other, L/C, T/T
China
联系人 Ms. Cara
(cara@kingherbs.com.cn) 901#, Blding 3, WanShuDanDi, Changsha, Changsha, Hunan
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
(*2 **4 mg/kg DM in red onion, *3 **3 mg/kg DM in yellow onion
and **5 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: KWD**-S
CAS Registry Number: *********5
Type of Compound Code(s): VK***0
Molecular Formula: C*1H*0O*2
Molecular Weight: **4.**2
Accurate Mass: **4.****8
Percentage Composition: C *4.*2%; H 4.*4%; O *1.*4%
Biological Source: Isol. from Spiraea ulmaria and other plant spp.
Physical Description: Yellow needles (MeOH aq.)
Melting Point: Mp ******1 (******0).
We use the red onion for extraction, which contains the highest
spiraeoside.