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Evaluation of total phenolics, flavonoids and antioxidant activity of 18 Korean onion cultivars: a comparative study.
J Sci Food Agric. 2014 Jun; 94(8):1521-9.JS

Abstract

BACKGROUND

Onion is undoubtedly one of the major sources of flavonoids. However, there exists a varietal difference in composition, concentration and beneficial activities of onion, on the basis of cultivars, day length sensitivity/ripening and types. To characterise such differences, 18 onion cultivars from Korean were evaluated for their total phenolics, flavonoids and antioxidant activity. Simultaneous quantification of quercetin, quercetin-3,4'-O-diglucoside, quercetin-4'-O-monoglucoside and isorhamnetin-3-glucoside was made in methanol and 75% ethanol.

RESULTS

Total phenolic content was examined spectrophotometrically with the Folin-Ciocalteu phenol reagent and total antioxidant activity were studied by the ferric reducing antioxidant power (FRAP) and diphenyl picryl hydrazyl (DPPH) methods. The cultivar 'Sunpower' showed the highest level of total phenolics [5016 ± 30.0 µg gallic acid equivalents g(-1) dry weight (DW)] and flavonoids (2873.95 ± 60.01 µg Q g(-1) DW) among the 18 cultivars in methanol. However, there were fewer total phenolics and flavonoids in ethanol extracts. The antioxidant activity for cultivar Sunpower was highest in ethanol extracts 24.12 ± 1.00 and 16.13 ± 0.35 µmol L(-1) Trolox equivalents g(-1) DW with FRAP and DPPH, respectively.

CONCLUSION

Among the 18 cultivars, Sunpower is the most promising in terms of total phenolics, total flavonoids and antioxidant activity. Our results suggest that day length sensitivity/ripening among the cultivars do not play any significant role for high values of total phenolics, flavonoids and antioxidant activity.

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Publisher Full Text (DOI)

Authors+Show Affiliations

Sharma K
Department of Molecular Biotechnology, Konkuk University, Seoul, 143-701, Republic of Korea.
Assefa AD
No affiliation info available
Kim S
No affiliation info available
Ko EY
No affiliation info available
Lee ET
No affiliation info available
Park SW
No affiliation info available

MeSH

AntioxidantsFlavonoidsFlavonolsOnionsPhenolsPhotoperiodPlant ExtractsPlant RootsQuercetinRepublic of KoreaSpecies Specificity

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

24136245

Citation

Sharma, Kavita, et al. "Evaluation of Total Phenolics, Flavonoids and Antioxidant Activity of 18 Korean Onion Cultivars: a Comparative Study." Journal of the Science of Food and Agriculture, vol. 94, no. 8, 2014, pp. 1521-9.
Sharma K, Assefa AD, Kim S, et al. Evaluation of total phenolics, flavonoids and antioxidant activity of 18 Korean onion cultivars: a comparative study. J Sci Food Agric. 2014;94(8):1521-9.
Sharma, K., Assefa, A. D., Kim, S., Ko, E. Y., Lee, E. T., & Park, S. W. (2014). Evaluation of total phenolics, flavonoids and antioxidant activity of 18 Korean onion cultivars: a comparative study. Journal of the Science of Food and Agriculture, 94(8), 1521-9. https://doi.org/10.1002/jsfa.6450
Sharma K, et al. Evaluation of Total Phenolics, Flavonoids and Antioxidant Activity of 18 Korean Onion Cultivars: a Comparative Study. J Sci Food Agric. 2014;94(8):1521-9. PubMed PMID: 24136245.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Evaluation of total phenolics, flavonoids and antioxidant activity of 18 Korean onion cultivars: a comparative study. AU - Sharma,Kavita, AU - Assefa,Awraris D, AU - Kim,Seol, AU - Ko,Eun Young, AU - Lee,Eul Tai, AU - Park,Se Won, Y1 - 2013/11/15/ PY - 2013/06/12/received PY - 2013/08/22/revised PY - 2013/10/17/accepted PY - 2013/10/19/entrez PY - 2013/10/19/pubmed PY - 2014/12/19/medline KW - antioxidant KW - flavonols KW - onion KW - total flavonoids KW - total phenolics SP - 1521 EP - 9 JF - Journal of the science of food and agriculture JO - J Sci Food Agric VL - 94 IS - 8 N2 - BACKGROUND: Onion is undoubtedly one of the major sources of flavonoids. However, there exists a varietal difference in composition, concentration and beneficial activities of onion, on the basis of cultivars, day length sensitivity/ripening and types. To characterise such differences, 18 onion cultivars from Korean were evaluated for their total phenolics, flavonoids and antioxidant activity. Simultaneous quantification of quercetin, quercetin-3,4'-O-diglucoside, quercetin-4'-O-monoglucoside and isorhamnetin-3-glucoside was made in methanol and 75% ethanol. RESULTS: Total phenolic content was examined spectrophotometrically with the Folin-Ciocalteu phenol reagent and total antioxidant activity were studied by the ferric reducing antioxidant power (FRAP) and diphenyl picryl hydrazyl (DPPH) methods. The cultivar 'Sunpower' showed the highest level of total phenolics [5016 ± 30.0 µg gallic acid equivalents g(-1) dry weight (DW)] and flavonoids (2873.95 ± 60.01 µg Q g(-1) DW) among the 18 cultivars in methanol. However, there were fewer total phenolics and flavonoids in ethanol extracts. The antioxidant activity for cultivar Sunpower was highest in ethanol extracts 24.12 ± 1.00 and 16.13 ± 0.35 µmol L(-1) Trolox equivalents g(-1) DW with FRAP and DPPH, respectively. CONCLUSION: Among the 18 cultivars, Sunpower is the most promising in terms of total phenolics, total flavonoids and antioxidant activity. Our results suggest that day length sensitivity/ripening among the cultivars do not play any significant role for high values of total phenolics, flavonoids and antioxidant activity. SN - 1097-0010 UR - https://www.unboundmedicine.com/medline/citation/24136245/Evaluation_of_total_phenolics_flavonoids_and_antioxidant_activity_of_18_Korean_onion_cultivars:_a_comparative_study_ DB - PRIME DP - Unbound Medicine ER -