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

The effect of variety, storage temperature and time on the total concentration of polyphenols and the composition of the flavonoid complex was studied in onion. Three cultivars (red - Karmen, yellow - Vsetana, white - Ala) were used. Polyphenol concentration was estimated spectrophotometrically with...

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Bibliographic Details
Published in:Horticultural science (Praha) 2003-12, Vol.30 (4), p.142-147
Main Authors: Lachman, J, Pronek, D, Hejtmankova, A, Dudjak, J, Pivec, V, Faitova, K. (Ceska Zemedelska Univ., Prague (Czech Republic). Agronomicka Fakulta)
Format: Article
Language:English
Subjects:
ALLIUM CEPA
ALMACENAMIENTO
Antioxidants
CEBOLLA
changes during storage
CHEMICAL COMPOSITION
COLOR
COLOUR
COMPOSICIÓN QUIMICA
COMPOSITION CHIMIQUE
COULEUR
ENVIRONMENTAL TEMPERATURE
Flavonoids
High performance liquid chromatography
Laboratories
Liquid chromatography
OIGNON
onion
ONIONS
Phenolic compounds
Phenols
POLIFENOLES
POLYPHENOLS
POLYPHÉNOL
Quercetin
Reagents
red, yellow and white varieties
Rutin
Spectrophotometry
spiraeoside
STOCKAGE
STORAGE
TEMPERATURA AMBIENTAL
Temperature effects
TEMPS
TEMPÉRATURE AMBIANTE
TIEMPO
TIME
VARIEDADES
varietal differences
VARIETIES
VARIÉTÉ
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Summary:The effect of variety, storage temperature and time on the total concentration of polyphenols and the composition of the flavonoid complex was studied in onion. Three cultivars (red - Karmen, yellow - Vsetana, white - Ala) were used. Polyphenol concentration was estimated spectrophotometrically with Folin-Ciocalteau's phenolic reagent, flavonoid components were determined by HPLC method. An increase in total polyphenols during storage was found in red and yellow varieties, esp. during storage at laboratory temperature (22 deg C). The major constituents of flavonoids and polyphenols were spiraeoside (quercetin-4'-O-beta-D-glucoside), rutin and quercetin and three other not identified compounds. Significant varietal differences were found, spiraeoside concentrations were 32,234 mg/kg DM in Karmen, 23,283 mg/kg DM in Vsetana and 265 mg/kg DM in Ala. Rutin ranged from 15 mg/kg DM in Ala to 157 mg/kg DM in Karmen, quercetin from 1 mg/kg DM in Ala to 163 mg/kg DM in Karmen. Flavonoids concentrations increased during storage, esp. at laboratory temperature.
ISSN:0862-867X
1805-9333
DOI:10.17221/3876-hortsci