Teagasc Food Research Centre , Ashtown, Dublin D15 KN3K, Ireland .
University College Cork , Western Road, Cork, Ireland .
J Agric Food Chem. 2017 Jun 28;65(25):5122-5132. doi: 10.1021/acs.jafc.7b01352. Epub 2017 Jun 14.
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.
我们进行了一项为期 6 年的研究，以评估常规、有机和混合种植方式对洋葱中生物活性化合物（类黄酮、花青素）和抗氧化能力的影响。在一个长期的分块因子系统比较试验中，对两个品种（“Hyskin”和“Red Baron”）进行了总类黄酮、总花青素、单个类黄酮、单个花青素和抗氧化活性的测量。这是在同一个试验中对同一作物类型进行的长时间内生物活性含量的重复测量的首次报道。与完全常规管理相比，在完全有机管理下，两个品种的抗氧化活性（DPPH 和 FRAP）、总类黄酮含量和 Q 3,4' D 和 Q 3 G 水平均更高。“Red Baron”和在有机土壤处理下生长的洋葱中的总类黄酮含量更高。这些差异主要归因于有机农业中使用的不同土壤管理实践，而不是农药/除草剂的应用。
