摘要
目的:了解8种花茶中微量元素铁、铜、锌、锰的含量及体外抗氧化能力。方法:花茶样品经混酸湿法消解处理,用火焰原子吸收分光光度法测定4种微量元素的含量;采用超声辅助技术制备花茶水提液,考察其对·OH和DPPH·的清除能力,对Fe^(3+)的还原力及抑制脂质过氧化能力。结果:花茶中Fe、Cu、Zn、Mn含量均很丰富,Fe、Mn、Cu、Zn含量最高的分别是桂花、黄山贡菊、野菊花、野菊花。不同花茶水提液具有不同的抗氧化活性,桂花水提液具有明显的DPPH·清除能力、Fe^(3+)还原能力和抑制脂质过氧化能力,百合花具有明显的·OH清除能力。结论:8种花茶中含有丰富的微量元素,且具有较强的抗氧化活性,是一类潜在的天然抗氧化资源,对人体健康十分有益。
Objective： The aim of this study were to determination of trace elements（Fe, Cu, Zn and Mn） and antioxidant activities of eight flower teas. Methods： The samples were digested by mixed acid. The contents of trace elements in flower teas were determined by flame atomic absorption spectrometry. The aqueous extracts were extracted with the ultrasonic-assisted technology. And then, the antioxidant activities of flowers were systemically evaluated using hydroxyl free radical scavenging assay, DPPH radical scavenging assay, ferric-reducing antioxidant power（FRAP） and lipid peroxidation inhibition assay. Results： The results showed that flower teas contained abundant trace elements（Fe, Cu, Zn and Mn）. For the mineral iron, manganese, copper and zinc, the highest amount was observed in osmanthus fragrans, Huangshan chrysanthemum, wild chrysanthemum and wild chrysanthemum, respectively. In addition, different flowers had diverse antioxidant capacities. Osmanthus fragrans were found to have the highest DPPH radical scavenging activities, ferric-reducing antioxidant power, and lipid peroxidation inhibition activities, respectively. Moreover, lilium were found to have the highest ·OH radical scavenging activity. Conclusion： Flower teas were a rich source of trace elements and possessed the high antioxidant capacities, which could be potential rich resources of natural antioxidants and benefit to human health.
出处
《食品科技》
CAS
北大核心
2016年第7期284-288,共5页
Food Science and Technology
基金
河南省教育厅科学技术研究重点项目(14A330008)
关键词
花茶
微量元素
抗氧化活性
flower teas
trace elements
antioxidant activities
