摘 要：
现在很多广告都说自己的饮品可以抗衰老，于是，本次我研究了市售11种瓶装饮料、8种茶包以及四种发酵程度不同的茶叶，包括龙井绿茶、金骏眉红茶、铁观音乌龙茶、福鼎白茶，分别对各自的抗氧化力做了研究，利用碘的滴定法测量其抗氧化力。同时，我对茶叶进行了深入的研究，通过改变冲泡时间、浓度、温度、添加物质，研究茶叶的抗氧化力变化，并得到以下结论：1、所有测试品种中最好的是茉莉花茶包，实验中碘液滴定数为142滴，其次是龙井绿茶滴定次数为100滴。2、市售瓶装饮料中双柚汁有较好的抗氧化力，碘液滴定数最高为63滴。其次是绿茶，碘液滴定数为35滴。3、市售茶包中抗氧化力效果最好的是茉莉花茶包，碘液滴定数为34滴，其次精选红茶包抗氧化力最强，碘液滴数是31滴。4、茶叶中抗氧化力最强的是龙井绿茶，平均滴定数最高，且茶叶冲泡时间越长、浓度越高、温度越高，茶叶的抗氧化力越强。5、在茶叶中添加越多的牛奶，会使抗氧化力增加，而其他添加物对抗氧化力没有明显改善，甚至降低。
关键词：茶叶；抗氧化力；健康；抗衰老
Abstract:
Nowadays, many advertisements claim that their beverages have anti-aging effects. Therefore, this study investigated the antioxidant capacity of 11 types of commercially available bottled beverages, 8 types of tea bags, and four kinds of teas with different fermentation degrees, including Longjing Green Tea, Jinjunmei Black Tea, Tieguanyin Oolong Tea, and Fuding White Tea. The antioxidant capacity was measured using the iodine titration method. Meanwhile, an in-depth study was conducted on teas to explore the changes in their antioxidant capacity by varying brewing time, concentration, temperature, and added substances. The main conclusions are as follows: 1. Among all tested samples, jasmine tea bags showed the best antioxidant capacity with an iodine titration count of 142 drops, followed by Longjing Green Tea with 100 drops. 2. Among commercially available bottled beverages, pomelo juice exhibited favorable antioxidant capacity with the highest iodine titration count of 63 drops, followed by green tea with 35 drops. 3. Among commercial tea bags, jasmine tea bags had the optimal antioxidant capacity with a titration count of 34 drops, and premium black tea bags ranked second with 31 drops. 4. Longjing Green Tea possessed the strongest antioxidant capacity among the four loose-leaf teas with the highest average titration count. Furthermore, the antioxidant capacity of tea was enhanced with longer brewing time, higher concentration, and higher water temperature. 5. The addition of milk increased the antioxidant capacity of tea in a dose-dependent manner, while other additives showed no significant improvement or even reduced the antioxidant effect.
Keywords: Tea; Antioxidant Capacity; Health; Anti-aging
