Abstract
Visual detection of meat spoilage was performed based on hydrolysis‐induced silver metallization on gold nanoparticles (Au NPs). The hydrolysis of 4‐I‐benzene‐bounded Wang resin was induced by the release of a biogenic amine followed by Au‐catalyzed Heck cross‐coupling reaction that made silver‐coated gold core‐shell NPs (Au@Ag) in the presence of Ag ions (Ag metallization). A portable sensory cap was designed by this hypothesis and the successful results were obtained for histamine, trimethylamine, and a spoilage sheep meat. With this protocol, the localized surface plasmon resonance (LSPR) is tuned for absorption of Au NPs and leads to LSPR peak blue shift of gold nanoparticles due to the Ag metallization and the preparation of Au@Ag core‐shell NPs. Au NPs and the resulting Au@Ag NPs were characterized by transmission electron microscopy (TEM), BET, ultraviolet‐visible (UV‐Vis), X‐ray diffraction (XRD), energy dispersive X‐ray (EDX), and dynamic light scattering (DLS) analyses. Also, various control experiments were set up to credit the portable sensory tube.
Highlights
The foodborne illness caused by pathogens, toxins, and other contaminants is a serious risk to human health
GCMS analyses were conducted on an Agilent gas chromatography/mass spectrometer (GC/MS) system supplied with the detectors of Agilent technologies 6890 N Network GC system and Agilent Technologies 5973 mass-selective
As a hypothesis presented by Lin et al [10], histamine, as a biogenic amine, increases the pH of the medium and hydrolyzes 4-iodobenzoic acid from the Wang resin and catalyzes the subsequent Suzuki coupling reaction by coordinating gold nanoparticles (Scheme 2)
Summary
The foodborne illness caused by pathogens, toxins, and other contaminants is a serious risk to human health. Metallic nanoparticles made of gold or silver have many visual and electronic properties depend on their size and composition. Because these materials have a high affinity for bonding with biomolecules, they can be used to create chemical sensors [5,6,7,8,9]. Chemicals on the nanoparticle surface can be controlled by organic bond-forming agents such as thiol molecules or thiol-containing polymers, resulting in a high particle affinity for bonding with sulfhydryl groups (which form relatively strong covalent bonds) [1, 11]. The proper formation of gold nanoparticles is associated with the presence of a surface plasmon group with a visible/ultraviolet absorption profile [12]. The surface plasmon group results from the accumulation of electrons
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