A highly sensitive and selective fluorescent probe for quantitative detection of Al³⁺ in food, water, and living cells

Jiang, Qian; Li, Mingxin; Song, Jie; Yang, Yiqin; Xu, Xu; Xu, Haijun; Wang, Shifa

A highly sensitive and selective fluorescent probe for quantitative detection of Al³⁺ in food, water, and living cells

2019

Three novel β-pinene-based fluorescent probes 2a–2c were designed and synthesized for the selective detection of Al³⁺. Probe 2a showed higher fluorescence intensity toward Al³⁺ than the other two compounds. Probe 2a determined the concentration of Al³⁺ with a rapid response time (45 s), wide pH range (pH = 1–9), excellent sensitivity (LOD = 8.1 × 10⁻⁸ M) and good selectivity. The recognition mechanism of probe 2a toward Al³⁺ was confirmed by ¹H NMR, HRMS and DFT analysis. Probe 2a was successfully used as a signal tool to quantitatively detect Al³⁺ in food samples and environmental water samples. Furthermore, probe 2a was successfully utilized to label intracellular Al³⁺, indicating its promising applications in living cells.

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