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第 1 期 宋 健,等: 基于咖啡酸的水合肼荧光探针的合成及应用 ·55·
2.7 应用研究 3 结论
为了研究探针在实际生活中的应用,将直径为
4 cm 的圆形滤纸放在 10 μmol/L 的探针溶液中浸泡 以资源丰富的天然提取物咖啡酸为原料,设计
2 min 后取出,自然风干后拍照如图 8 所示。可以看 合成了一种基于咖啡酰基结构的新型小分子荧光探
出,随着N 2H 4 浓度(70、100、150、300、450、600 μmol/L) 针 ED,探针 ED 可用于特异性识别 N 2 H 4 。荧光探
的增加,负载 ED 的滤纸的荧光颜色逐渐由蓝色变为 针具有合成简单、响应时间短(48 s)、选择性高、
蓝绿色,该试纸可用于水样中微量 N 2H 4 的检测,为 检测限低(0.31 μmol/L)、pH 适用范围宽(pH 3~8)
13
N 2H 4 的便捷、快速检测提供了新的方法。 等特点。通过 HNMR、 CNMR 和 HRMS 对探针
1
随后,将化合物ED用于环境水样中N 2H 4 的检测, 结构进行表征,探索探针 ED 对 N 2 H 4 的识别机理。
结果如图 9 所示。可以看出,在 493 nm 处,3 种水样 应用研究表明,基于探针 ED 的试纸可用于水样中
溶液的荧光强度与 N 2H 4 浓度(15、20、25、30、35、 N 2 H 4 的痕迹检测。咖啡酰基有机荧光探针的合成,
2
40 μmol/L)均呈线性关系,且 R 值均>0.99。如表 1 不仅拓宽了天然提取物咖啡酸在荧光材料领域的应
所示,3 种水样的回收率均在 95.2%~104.9%之间,回
用,而且为咖啡酸的深度加工利用提供了重要的理
收率较高,表明化合物 ED 可用于实际水样中 N 2H 4 论依据。
的痕量检测。
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