A disulfide linked naphthalimide dimer probe was designed for mercury ion (Hg2+) recognition in this work. The recognition was based on the strong affinity of mercury for sulfur. The experimental results revealed that the probe exhibited high selectivity and sensitivity toward Hg2+ in comparison to other metal ions via a turn-on and reversible response to Hg2+ in neutral buffer solution. More importantly, the probe demonstrated a linear response for Hg2+ over a concentration range from 0 to 150 μM with a detection limit of 0.38 μM, which is just the limit of the safe concentration for humans. Upon addition of 150 μM Hg2+, the enhancement of fluorescence reached a maximum (∼7-fold). The performances of the probe indicated that it could meet the selectivity requirements for biomedical and environmental application and also was sensitive enough to detect Hg2+ in environmental and biological samples.
本工作设计了一种通过二
硫键连接的
萘酰亚胺二聚体探针,用于
汞离子 (Hg2+) 的识别。该识别基于
汞对
硫的强亲和力。实验结果表明,在中性缓冲溶液中,探针对 Hg2+ 表现出高选择性和灵敏度,相较于其他
金属离子,其对 Hg2+ 的响应是开启式的且可逆的。更为重要的是,该探针对 Hg2+ 的浓度在 0 至 150 μM 范围内具有线性响应,检测限为 0.38 μM,这正是人体安全浓度的极限。当加入 150 μM 的 Hg2+ 时,荧光增强达到最大(约 7 倍)。探针的性能表明,它能够满足
生物医学和环境应用的选择性要求,并且足够灵敏,可用于环境和
生物样本中 Hg2+ 的检测。