CITAB⁄UTAD-Centre for the Research and Technology for Agro-Environment and Biological Sciences, Universidade de Trás-os-Montes e Alto Douro, Apartado 1013, 5001-801 Vila Real, Portugal.
Molecules. 2011 Aug 10;16(8):6816-32. doi: 10.3390/molecules16086816.
Research on natural and bioactive compounds is increasingly focused on their effects on human health, but there are unexpectedly few studies evaluating the relationship between climate and natural antioxidants. The aim of this study was analyze the biological role of six different Brassica vegetables (Brassica oleracea L. and Brassica rapa L.) as a natural source of antioxidant compounds. The antioxidant activity may be assigned to high levels of L-ascorbic acid, total phenolics and total flavonoids of each sample. The climate seasons affected directly the concentration of bioactive components and the antioxidant activity. Broccoli inflorescences and Portuguese kale showed high antioxidant activity in Spring-Summer whilst turnip leaves did so in Summer-Winter. The Brassica vegetables can provide considerable amounts of bioactive compounds and thus may constitute an important natural source of dietary antioxidants.
天然生物活性化合物的研究越来越关注其对人类健康的影响，但评估气候与天然抗氧化剂之间关系的研究却少之又少。本研究旨在分析六种不同的甘蓝类蔬菜（芸薹属和芸薹属）作为天然抗氧化剂化合物来源的生物作用。抗氧化活性可能归因于每个样本中 L-抗坏血酸、总酚和总类黄酮的高含量。气候季节直接影响生物活性成分和抗氧化活性的浓度。春夏季，青花菜和羽衣甘蓝表现出高的抗氧化活性，而夏冬季则是萝卜叶。甘蓝类蔬菜可提供大量的生物活性化合物，因此可能构成膳食抗氧化剂的重要天然来源。
