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Updated: Aug 30, 2026
Multicolor Fluorescence Detection for Droplet Microfluidics Using Optical Fibers
Published on: May 5, 2016
Bioinspired multi-colored colloidal array for simultaneous visual sensing of bisphenol B and levofloxacin assisted by
Tiantian Li1, Ziwei Chen1, Qi Li1
1Department of Nutrition and Food Hygiene, School of Public Health, Tianjin Medical University, Tianjin, 300070, PR China; Tianjin Key Laboratory of Environment, Nutrition and Public Health, Center for International Collaborative Research on Environment, Nutrition and Public Health, Tianjin Medical University, Tianjin, PR China.
Abstract:
The integration of multiple optical signals with independent responses within a single sensing architecture is of interest for multiplex small-molecule detection. An anole-inspired multi-colored colloidal array (MCA) probe integrating structural reflection (SR), fluorescein isothiocyanate (FITC), and europium acetylacetonate (EU) emissions was developed for simultaneous visual detection of bisphenol B (BPB) and levofloxacin (LVX). The probe consists of a highly ordered non-close-packed (NCP) colloidal array assembled from FITC- and EU-doped molecularly imprinted particles, enabling the coexistence of structural color and dual-emission luminescence within a single architecture. The periodic array generates an additional SR signal via Bragg diffraction, while the enlarged interparticle spacing suppresses aggregation-induced quenching and non-radiative losses, resulting in enhanced FITC and EU emissions. Upon exposure to BPB and LVX, orthogonal optical responses are triggered, producing concentration-dependent multicolor variations that are directly observable by the naked eye, enabling dual-target discrimination. To quantitatively decode these physico-optical responses, a logic-guided physico-optical decoding (LGPD) framework is employed, enabling simultaneous prediction of BPB and LVX concentrations with high correlation coefficients (range from 0.964 to 0.994). The probe exhibits stable tri-color emission over 20 days, with sensitivity low to 1 ng/mL, a linear range of 1-300 ng/mL, and recoveries of 85.4 %-98.61 % in real samples. This multimodal optical encoding and machine-learning-based decoding strategy enables rapid (<30 min) multiplexed detection and provides a generalizable platform for point-of-care analysis in environmental and biomedical applications. This bioinspired integration of optical encoding and machine-learning-assisted decoding provides an alternative strategy for visual and quantitative multiplex sensing.
