A Dual Fluorometric and Colorimetric Sulfide Sensor Based on Coordinating Self-Assembled Nanorods: Applicable for Monitoring Meat Spoilage

Abstract

Psychrotrophic bacteria, commonly called spoilage bacteria, can produce highly toxic hydrogen sulfide (H2S) in meat products. Thus, monitoring the presence of hydrogen sulfide in meat samples is crucial for food safety and storage. Here, we report a unique chemical sensor based on supramolecular nanorods synthesized via copper ion induced self-assembly of N,N-bis[aspartic potassium salt]-3,4,9,10-perylenetetracarboxylic diimide (APBI-K). The self-assembled nanorods can specifically detect sulfide with a detection limit of 0.181 μM in solution. The nanorods suspended in pure water show a turn-on fluorescence sensing behavior along with color change, acting as a dual fluorometric and colorimetric sensor. Spectroscopic investigation confirms the sensing mechanism due to copper ion displacement induced by the association with sulfide. Based on the high selectivity and sensitivity, supramolecular nanorod sensors were successfully employed to detect H2S in spoiled meat sample as well as dissolved H2S in water.

Fluorescence Turn-on Detection of Perfluorooctanoic Acid (PFOA) by Perylene Diimide-Based Metal–Organic Framework

“…This characteristic absorbance of U-1 MOF could be assigned to the 0−0, 0−1, and 0−2 transition energies of the PDI molecule. 74 When compared to the molecularly dispersed state of H 2 L ligand in solution phase with emission maximized at 552 nm (Figure S12), the fluorescence spectrum measured for the U-1 MOF demonstrates an ∼4 nm red shift. This implies a conformational change of the p-conjugation structure of PDI backbone, particularly the dihedral twisting angle around the four chloromoieties.…”

“…The UV–vis spectrum of U-1 MOF shows two strong absorption bands near 543 and 496 nm, with a broad shoulder peak around 456 nm (Figure S11). This characteristic absorbance of U-1 MOF could be assigned to the 0–0, 0–1, and 0–2 transition energies of the PDI molecule . When compared to the molecularly dispersed state of H 2 L ligand in solution phase with emission maximized at 552 nm (Figure S12), the fluorescence spectrum measured for the U-1 MOF demonstrates an ∼4 nm red shift.…”

Correction: Dalapati et al. A Dual Fluorometric and Colorimetric Sulfide Sensor Based on Coordinating Self-Assembled Nanorods: Applicable for Monitoring Meat Spoilage. Chemosensors 2022, 10, 500

“…There was an error in the original publication. At the end of the article [1], https:// www.mdpi.com/2227-9040/10/12/500 (accessed on 6 June 2023), the section "Conflicts of Interest: The authors declare no conflict of interest." should be corrected as "Conflicts of Interest: Ling Zang has a significant financial interest in Gentex Corporation, which funded this research.…”