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Higher Antioxidant Activity, Total Flavonols, and Specific Quercetin Glucosides in Two Different Onion (Allium cepa L.) Varieties Grown under Organic Production: Results from a 6‑Year Field Study

Ren, Feiyue; Reilly, Kim; Kerry, Joseph P; Gaffney, Michael; Hossain, Mohammad and Rai, Dilip K (2017) Higher Antioxidant Activity, Total Flavonols, and Specific Quercetin Glucosides in Two Different Onion (Allium cepa L.) Varieties Grown under Organic Production: Results from a 6‑Year Field Study. Journal of Agricultural and Food Chemistry, 65, pp. 5122-5132.

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Online at: http://pubs.acs.org/doi/pdf/10.1021/acs.jafc.7b01352

Summary

We carried out a 6-year study to assess the effect of conventional, organic, and mixed cultivation practices on bioactive compounds (flavonoids, anthocyanins) and antioxidant capacity in onion. Total flavonoids, total anthocyanins, individual flavonols, individual anthocyanins, and antioxidant activity were measured in two varieties (‘Hyskin’ and ‘Red Baron’) grown in a long-term split-plot factorial systems comparison trial. This is the first report of repeated measurements of bioactive content over an extensive time period in a single crop type within the same trial. Antioxidant activity (DPPH and FRAP), total flavonol content, and levels of Q 3,4′ D and Q 3 G were higher in both varieties under fully organic compared to fully conventional management. Total flavonoids were higher in ‘Red Baron’ and when onions were grown under organic soil treatment. Differences were primarily due to different soil management practices used in organic agriculture rather than pesticide/ herbicide application.


EPrint Type:Journal paper
Keywords:onion (Allium cepa L.), organic, conventional, flavonoids, anthocyanins, antioxidant activity.
Agrovoc keywords:
LanguageValueURI
EnglishUNSPECIFIEDUNSPECIFIED
Subjects: Food systems > Food security, food quality and human health
Crop husbandry > Crop health, quality, protection
Research affiliation: Ireland
Ireland > Teagasc - Agriculture and Food Development Authority
DOI:10.1021/acs.jafc.7b01352
Deposited By: Clavin, Mr Dan
ID Code:32039
Deposited On:09 Aug 2017 15:18
Last Modified:09 Aug 2017 15:18
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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