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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Food Science

Background:

  • Real-time food freshness monitoring is crucial for public health.
  • Conventional packaging lacks quality feedback capabilities.
  • Existing biogenic amine (BA) sensors often use unreliable "turn-off" modes prone to errors.

Purpose of the Study:

  • To develop a high-performance intelligent packaging platform for reliable food freshness assessment.
  • To create a dual-signal sensor using hydrogen-bonded organic framework (HOF) composites.
  • To enable intuitive, real-time monitoring of food quality.

Main Methods:

  • Fabrication of a dual-signal sensor (PFC@MCCPBA) by encapsulating 4-carboxyphenylboronic acid (CPBA) within melamine-cyanuric acid (MC) HOF and integrating pyrene-based HOF (PFC-1).
  • Utilizing host-guest assembly strategy for HOF composite formation.
  • Developing independent fluorescence-phosphorescence signals with a "turn-on" response mode for BA detection.

Main Results:

  • The developed HOF composite exhibits ultralong phosphorescence (1400 ms lifetime).
  • The PFC@MCCPBA sensor achieved rapid, selective detection of BAs with low limits of detection.
  • A flexible intelligent packaging film was successfully fabricated for practical application.

Conclusions:

  • This work presents a novel strategy for designing multiresponsive HOF-based materials.
  • The intelligent packaging platform offers a reliable solution for real-time food freshness monitoring.
  • The developed system advances the field of intelligent food packaging and enhances food safety.