A Single-Component Ce-MOF Sensor for Dual-Target Sensing: Ratiometric/Colorimetric Detection of Vitamin B2 with
Yu-Peng Luo1,2, Ling Li3, Sheng-Yong You1
1Institute of Materials and Intelligent Manufacturing, Jiangxi Academy of Sciences, Nanchang330096, P R China.
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Vitamin B2 (VB2) and Vitamin B6 (VB6) are essential micronutrients for maintaining normal physiological functions. Deficiency and excessive intake of vitamins can lead to significant health issues. Herein, a single-component cerium-based MOF sensor (Ce-MOF), {[Ce2(BTB)2(DMF)2]•2DMF•2.5H2O}n is synthesized via solvothermal methods. The as-prepared Ce-MOF exhibits excellent water stability and distinct ligand-centered emission, which serves as an efficient dual-target sensor, enabling highly selective and sensitive ratiometric and colorimetric detection of VB2, as well as fluorometric detection of VB6. Upon addition of VB2, Ce-MOF exhibits a new emission peak at 527 nm, accompanied by a visible fluorescence color change from blue to yellow-green. The quenching constant is 8.41 × 104 M-1, and the detection limit is as low as 0.052 μM. In the case of VB6, the emission peak gradually red-shifts to 395 nm, with a quenching constant of 2.06 × 104 M-1 and a detection limit of 0.355 μM. Moreover, a Ce-MOF-embedded portable hydrogel combined with smartphone-assisted RGB analysis is fabricated, enabling visual and quantitative detection of VB2 and achieving excellent recovery (92.4-106.6%) in vitamin tablets, banana extracts, and sugar. These results highlight the potential of Ce-MOF as an efficient and practical dual-target sensor for nutritional analysis.
