Encapsulating Ru(bpy) in an infinite coordination polymer network: Towards a solid-state electrochemiluminescence sensing platform for histamine to evaluate fish product quality.

In this work, we demonstrate a novel solid-state electrochemiluminescence (ECL) sensor based on the Ru(bpy)@terbium-guanosine monophosphate infinite coordination polymer network ((Ru(bpy)@Tb-GMP ICPn). Comparing with the traditional luminescence of Ru(bpy) observed in a liquid system, the proposed method of encapsulating Ru(bpy) into ICPn for immobilization greatly improves the ECL signal and efficiency, which is attributed to the unique porous structure and large specific surface area of ICPn. Moreover, the solid-state Ru(bpy) ECL sensor has good biocompatibility and low toxicity. Taking histamine (HA) as a detection model, a good linear relationship between ECL intensity and logarithm of HA concentration was obtained with a low detection limit of 17 nM, and satisfactory results were obtained for detecting HA levels in fish samples as well. The proposed solid-state Ru(bpy) ECL sensor has great application prospects in the safety of food.