Nanotechnology Research Unit and Supramolecular Chemistry Research Unit, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Mahasarakham University, Mahasarakham, Thailand.
Supramolecular Chemistry Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand.
Environ Technol. 2020 Sep;41(23):3016-3022. doi: 10.1080/09593330.2019.1595163. Epub 2019 Apr 4.
A highly sensitive and selective optical membrane for determination of Au was synthesized by immobilization of a rhodamine derivative on agarose hydrogel. The sensing dye was synthesized by solvatochromism of rhodamine B via rhodamine lactone-zwitterion equilibrium. UV-vis spectroscopy, scanning electron microscopy (SEM), thermal gravimetric analysis (TGA) and attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) were employed to confirm that the rhodamine-lactone () was incorporated into the agarose hydrogel. The results showed that the sensor was highly selective for recognizing Au over other metal ions in real systems. In addition, DFT calculation results suggested that the membrane sensor formed stable complexes with Au through a large number of cation-dipole and ion-ion interactions. In addition, according to changes in signaling upon adding various Au concentration, the limit of detection of Arg-RhoL for Au is calculated to be 5 µM. This approach may provide an easily measurable and inherently sensitive method for Au ion detection in environmental and biological applications.
通过将罗丹明衍生物固定在琼脂糖水凝胶上，合成了一种用于测定 Au 的高灵敏度和选择性光学膜。传感染料是通过罗丹明 B 的溶剂变色通过罗丹明内酰胺-两性离子平衡来合成的。采用紫外-可见光谱、扫描电子显微镜（SEM）、热重分析（TGA）和衰减全反射傅里叶变换红外光谱（ATR-FTIR）证实罗丹明内酯（）已掺入琼脂糖水凝胶中。结果表明，该传感器在实际体系中对 Au 的识别具有高度选择性，优于其他金属离子。此外，DFT 计算结果表明，膜传感器通过大量的阳离子偶极子和离子-离子相互作用与 Au 形成稳定的配合物。此外，根据加入不同 Au 浓度时信号的变化，计算出 Arg-RhoL 对 Au 的检测限为 5 µM。该方法可为环境和生物应用中 Au 离子的检测提供一种易于测量且固有灵敏的方法。
