ABSTRACT

Research and development of natural antioxidants are gaining popularity with their wide application in food and medicine. Papaya (Carica papaya L.), a plant of medicinal and food value, is widely planted in tropical regions. This study was conducted to compare the tissues of different organs of papaya as well as the leaves and flowers of 9 cultivars of papaya. The three methods, namely, the 2,2’-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging assay, the 2,2’-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) radical scavenging assay and the ferric reducing antioxidant power (FRAP) assay, were used to determine the total antioxidant activities. Also, the total phenolic content and the total flavonoid content were investigated to evaluate the antioxidant capacity. Our research shows that leaves and roots of papaya manifested higher antioxidant properties among all tested organs, and leaves and flowers of Daqing cultivar exhibited the strongest antioxidant ability. Overall, our results indicate papaya has the potential to become a natural antioxidant resource.

摘要

天然抗氧化剂的研究和开发随着其在食品和医药中的广泛应用而越来越受欢迎。木瓜（Carica papaya ）L.)是一种具有药用价值和食用价值的植物，在热带地区广泛种植。本研究对木瓜不同器官的组织以及9个木瓜品种的叶和花进行了比较。三种方法，即 2,2'-二苯基-1-苦基肼 (DPPH) 自由基清除测定法、2,2'-叠氮基-双(3-乙基苯并噻唑啉-6-磺酸) (ABTS) 自由基清除测定法和铁还原抗氧化能力（FRAP）测定用于确定总抗氧化活性。此外，还研究了总酚含量和总黄酮含量以评估抗氧化能力。我们的研究表明，木瓜的叶和根在所有测试器官中表现出更高的抗氧化能力，大庆品种的叶和花表现出最强的抗氧化能力。全面的，