College of Landscape Architecture and Arts, Northwest A&F University, Yangling, Shaanxi 712100, China.
Food Res Int. 2017 Jul;97:141-148. doi: 10.1016/j.foodres.2017.03.018. Epub 2017 Mar 15.
As an important resource of functional food, the seeds of tree peony are rich in phenolic compounds, which are associated with antioxidant activity. However, so far there has not been systematic study on phenolic compositions and antioxidant activity of the seeds from wild tree peony species. The aim of this study was to determine the phenolic content, antioxidant compounds and antioxidant activity of seeds from nine tree peony species native to China. Among the seed samples, Paeonia rockii had the highest total flavonoid content, strongest DPPH and ABTS radical scavenging activities, and strongest cupric reducing capacity; P. decomposita subsp. rotundiloba had the highest total phenolic and flavanol contents, as well as the strongest hydroxyl radical scavenging activity. Sixteen individual phenolic compounds were quantitatively measured, with (+)-catechin being the most abundant component. The content of the phenolic compounds luteolin, paeonol, and the total flavonoid content were significantly correlated with four antioxidant activities. Hierarchical cluster analysis showed that P. rockii and P. decomposita subsp. rotundiloba could be clustered in a group having a high phenolic content and strong antioxidant activity. These results suggest P. rockii and P. decomposita subsp. rotundiloba are the most promising candidates as useful sources of natural antioxidants.
作为功能性食品的重要资源，牡丹籽富含酚类化合物，与抗氧化活性有关。然而，迄今为止，关于野生牡丹种籽的酚类成分和抗氧化活性还没有系统的研究。本研究旨在测定中国 9 种原产牡丹种籽的酚类含量、抗氧化化合物和抗氧化活性。在种子样品中，紫斑牡丹的总黄酮含量最高，对 DPPH 和 ABTS 自由基的清除能力最强，还原能力最强；凤丹牡丹亚种块根芍药的总酚和黄烷醇含量最高，对羟基自由基的清除能力最强。定量测定了 16 种单体酚类化合物，其中（+）-儿茶素含量最丰富。类黄酮化合物木犀草素、丹皮酚和总黄酮含量与四种抗氧化活性显著相关。层次聚类分析表明，紫斑牡丹和凤丹牡丹亚种块根芍药可以聚类为酚类含量高、抗氧化活性强的一组。这些结果表明，紫斑牡丹和凤丹牡丹亚种块根芍药是很有前途的天然抗氧化剂来源。
