不同采收期草莓果实抗氧化物质含量和抗氧化活性的变化

以“章姬”和“0362”为试材，研究不同时期采收的草莓果实抗氧化物质含量(总酚、总黄酮)和抗氧化活性(DPPH，TEAC和FRAP值)的动态变化 结果表明，在试验期内，随采收时期的推移，章姬、0362红熟期果实抗氧化物质含量和抗氧化活性均呈上升趋势；抗氧化物质含量和抗氧化活性在两品种间存在差异。统计分析表明，草莓果实的总酚和总黄酮含量与抗氧化活性之间存在明显的线性正相关，总酚与DPPH，TEAC和FRAP的相关系数分别为0.8228，0.8812，0.8419。因此，不同时期采收的草莓果实的抗氧化活性的变化与果实酚类物质含量的变化有关。

Changes of antioxidant compounds and antioxidant activities in strawberry fruit during different harvest time

The changes of antioxidant compound contents and antioxidant activities in strawberry during diferent harvest time were studied in the cultivar ‘Zhangji’ and cultivar ‘0362’．The results showed that the contents of total flavonoids，total phenolics and assay of DPPH，TEAC，FRAP in ‘Zhangji’ and ‘0362’ fruis significantly increased during the harvest time，which were significantly different between these two cultivars．The significantly positive linear relationships were found between the total phenolics content and antioxidant activities (correlation coefficients for DPPH，TEAC and FRAP were0．8228，0．8812 and 0．8419)．Therefore，the changes of antioxidant activities in strawberry fruit during diferent harvest time may be attributed to the content of phenolic compounds．