Abstract
Technologies for monitoring meat spoilage are important to ensuring consumer safety. As dimethyl sulfide (DMS) is a reliable marker for meat freshness, sensitive and selective DMS sensors are of great interest. Herein, two trinuclear cyano-bridged bimetallic donor–acceptor ensembles, FeII(bpy)2(CN)2–[PtII(DMSO)Cl2]2 (1) and FeII(bpy)2(CN)2–[AuICl]2, were synthesized, and corresponding solid-supported sensors were fabricated to determine the effect of the acceptor metal (MA) on DMS detection. Changing MA from AuI to PtII improved the sensitivity and selectivity owing to changes in the relative thermodynamic stabilities of the complex and MA–DMS adduct. When applied to real meat samples, 1 exhibited a linear spectroscopic response to DMS, even in the presence of interfering compounds, with a method detection limit of 1.0 ppm. The total bacteria count and gas chromatography–mass spectrometry results revealed that the spectroscopic signal generated by 1 correlated with the microbial growth level and DMS concentration during meat spoilage.
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