鱼腥草不同部位生物活性物质和抗氧化能力分析

为了全面了解鱼腥草的营养价值，以其叶片、地上茎和根状茎为材料，对不同部位的色度、生物活性物质和抗氧化能力进行分析。结果表明：不同部位间的色度、生物活性物质含量及抗氧化能力存在显著差异。叶片正面和地上茎a*值低，b*值高，而叶片背面恰好相反，根状茎亮度值L*最高。叶绿素、类胡萝卜素、维生素C、花青素、原花青素、类黄酮和总酚含量与抗氧化能力在部位分布上呈现叶片>地上茎>根状茎的趋势。相关性分析表明，7种生物活性物质与抗氧化能力间均呈极显著或显著正相关关系(P<005)，且亚铁还原能力法（FRAP）对应的相关系数均高于总抗氧化能力检测法（ABTS）（原花青素除外）。进一步与8种常见蔬菜进行比较发现，鱼腥草，特别是叶片部分，含有更为丰富的生物活性物质和较高的抗氧化能力，开发潜力巨大。

Analysis of bioactive compounds and antioxidant capacities in Houttuynia cordata

In order to understand the nutritional values of Houttuynia cordata， the CIE color values， bioactive compounds contents and antioxidant capacities among different organs （leaves， stems and rhizomes） in Houttuynia cordata were investigated in the present study. The results showed that significant differences were found among different tissues. The adaxial leaf surface and stems owned lower a* value and higher b* value， while the abaxial leaf surface was on the contrary， and the rhizomes had the highest L* value. The levels of chlorophyll， carotenoids， vitamin C， anthocyanins， proanthocyanidins， flavonoids， total phenolics and antioxidant capacities were followed as the trends of leaves> stems > rhizomes. Moreover， significant or extremely significant(P<005) positive correlations were found between antioxidant capacities and each bioactive compound. In addition， all the correlation coefficients associated with FRAP were higher than the corresponding values with ABTS， except proanthocyanidins. Then the levels of bioactive compounds and antioxidant capacities were compared between Houttuynia cordata with eight kinds of common vegetables. The results showed that Houttuynia cordata， especially leaves， contained more abundant bioactive compounds and antioxidant capacity， indicating Houttuynia cordata has great potential for development of functional vegetable.