1. 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
- Author
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Joseph P. Kerry, Mohammad B. Hossain, Kim Reilly, Dilip K. Rai, Michael Gaffney, and Feiyue Ren
- Subjects
Antioxidant ,Flavonols ,DPPH ,medicine.medical_treatment ,01 natural sciences ,Antioxidants ,Soil management ,chemistry.chemical_compound ,0404 agricultural biotechnology ,Glucosides ,Onions ,Botany ,medicine ,chemistry.chemical_classification ,Organic Agriculture ,biology ,Plant Extracts ,Soil organic matter ,fungi ,010401 analytical chemistry ,food and beverages ,04 agricultural and veterinary sciences ,General Chemistry ,Pesticide ,biology.organism_classification ,040401 food science ,0104 chemical sciences ,Horticulture ,chemistry ,Allium ,Quercetin ,General Agricultural and Biological Sciences - Abstract
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.
- Published
- 2017
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