Chemical-responsive ortho-vanillin functionalized PEG hydrogel as colorimetric sensor for biogenic amines detection in smart food packaging materials

초록

The development of intelligent packaging materials for real-time food quality monitoring has garnered significant attention in the food safety industry. However, preparing biomaterials with multiple functionalities, including desirable mechanical and stimuli-responsive properties, remains challenging. In this study, an o-vanillin benzoyl hydrazone polyethylene glycol (PEG_O-V) hydrogel was produced via metal-ligand coordination using Ni2+ leading to gelation. The hydrogel showed outstanding rheological behaviors, engineered by the ligand:Ni2+ ratio. In addition, hydrogels can confirm the existence of biogenic amines in liquid and vapor phases at different exposure times and concentrations through distinct color changes. The 2-phenylethylamine, trimethylamine and triethylamine were rapidly detected with distinct color changes and 135, 110 and 120 % red chromatic shift, respectively, followed by putrescine. Signs of meat spoilage at room temperature were observed after 2 days. This study highlights the potential of PEG-based hydrogels as effective, low-cost sensors for smart packaging applications to enhance food shelf life.

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