Sensitive and specific detection of trace Al³⁺ ions using an upconversion nanoparticle-xylenol orange complex via the inner filter effect.

IF 2.7 3区化学 Q2 CHEMISTRY, ANALYTICAL

Analytical Methods Pub Date : 2024-10-30 DOI:10.1039/d4ay01581a

Rui Jiang, Jinfeng Wang, Bin Feng, Panpan Mou, Shuo Zhou, Xianbo Zhang, Yan Zhou, Guosong Chen, Donghai Lin

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Abstract

We have developed a novel fluorescence sensor based on upconversion nanoparticles (UCNPs) for the rapid and sensitive detection of trace aluminum ions (Al³⁺). The sensor utilizes the inner filter effect (IFE) between the UCNPs and the xylenol orange-aluminum complex (XO-Al³⁺), resulting in significant fluorescence quenching at 543 nm upon Al³⁺ binding. This quenching correlates directly with the Al³⁺ concentration, allowing for quantitative detection within a range of 0-30 μM and achieving an ultra-low detection limit of 0.19 μM. Selectivity of the sensor is enhanced by the incorporation of ascorbic acid, which masks interfering Fe³⁺ ions, thus ensuring accurate determination of Al³⁺ even in the presence of other metal ions. The UCNPs-XO sensor exhibits excellent stability and reproducibility, and minimal interference from commonly co-existing substances. This makes it suitable for the detection of Al³⁺ in various matrices, including food products and environmental water samples. Our work offers a significant advancement in Al³⁺ detection, with potential applications in food safety, environmental monitoring, and public health.

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通过内滤光片效应，利用上转换纳米粒子-木酚橙复合物灵敏而特异地检测痕量 Al3+ 离子。

我们开发了一种基于上转换纳米粒子（UCNPs）的新型荧光传感器，用于快速灵敏地检测痕量铝离子（Al3+）。该传感器利用 UCNPs 和二甲酚橙-铝复合物（XO-Al3+）之间的内滤波效应（IFE），在 Al3+ 结合时产生 543 纳米波长的显著荧光淬灭。这种淬灭与 Al3+ 浓度直接相关，可在 0-30 μM 范围内进行定量检测，并实现了 0.19 μM 的超低检测限。该传感器的选择性因抗坏血酸的加入而增强，抗坏血酸可掩盖干扰的 Fe3+ 离子，从而确保即使在存在其他金属离子的情况下也能准确测定 Al3+。UCNPs-XO 传感器具有出色的稳定性和可重复性，并且受常见共存物质的干扰极小。因此，它适用于检测各种基质（包括食品和环境水样）中的 Al3+。我们的工作大大推进了 Al3+ 的检测，有望应用于食品安全、环境监测和公共卫生领域。

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