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Article Abstract
We developed a novel pH-responsive DNA hydrogel colorimetric biosensor specifically designed for the rapid, simple, and accurate assessment of meat freshness and spoilage. The system integrates i-motif structures with dual rolling circle amplification (RCA) to construct a gold nanoparticles (AuNPs)-embedded three-dimensional hydrogel network. Fourier-transform ultraviolet spectrophotometry, scanning electron microscopy, and rheological characterization confirmed pH-dependent responsiveness (5.5-8.0) with high sensitivity and stability. Applied to mutton and sea bass samples under varying storage conditions, the biosensor enabled visual detection of AuNPs release within 10 s using a transfer pipette, demonstrating enhanced sensitivity and operational simplicity. Correlation analysis linked storage duration, pH changes, and the A/A ratio to total volatile basic nitrogen (TVB-N) index levels at spoilage thresholds. This work establishes a foundation for developing DNA hydrogel-based integrated technologies or smart devices dedicated to real-time assessment of food quality.
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| http://dx.doi.org/10.1016/j.foodchem.2025.145629 | DOI Listing |
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