l‐Cysteine modified silver nanoparticles‐based colorimetric sensing for the sensitive determination of Hg²⁺ in aqueous solutions

Abstract

A simple and sensitive colorimetric sensing method was constructed for detection of Hg2+ in aqueous solutions and based on silver nanoparticles functionalized with l‐cysteine (l‐Cys–Ag NPs). In this method, adenosine triphosphate (ATP) induced aggregation of l‐Cys–Ag NPs. Simultaneously, the solution colour changed from bright yellow to brown. In the presence of Hg2+, Hg2+ chelated ATP to form a complex and reduce the degree of aggregation of l‐Cys–Ag NPs and was accompanied by a colour change from brown to bright yellow. The changing values of absorbance at 390 nm were linearly correlated with concentration of Hg2+ over the 4.00 × 10−8 to 1.04 × 10−6 mol·L−1 range, with a detection limit of 8 nM. This method was used successfully for detection of Hg2+ in real water samples and performed good selectivity and sensitivity. The recovery range was 91.5–109.1%, indicating that the method has vast application potential for determination of Hg2+ in the environment.

Recent advances and trends in innovative biosensor‐based devices for heavy metal ion detection in food

“…With suitable optical properties, superior catalytic efficiency, remarkable conductivity, abundant active sites, and high specific surface area of nanomaterials, extensive efficient and reliable biosensors have been constructed for monitoring the residual levels of HMIs in food‐related matrices (Manikandan et al., 2023; Orouji et al., 2023; Tang, Chen, et al., 2023). Following the development of optical biosensors in recent decades, from the initial chelation reaction sensors to the later distance‐induced localized surface plasmon resonance (LSPR) sensors and current widely reported enzyme‐mimetic reaction sensors, they have demonstrated significant applications for HMIs detection (Dai et al., 2022; Fan, He, et al., 2021; Na et al., 2016). In addition, electrochemical biosensors have evolved from the early period of simultaneous detection of multiple HMIs by anodic stripping voltammetry (ASV) based on the enrichment of HMIs with nanomaterials and signal amplification strategy to the present specific individual detection by constructing electrochemical aptasensors based on electrochemiluminescence (ECL) and photoelectrochemistry.…”

Tannic Acid-Functionalized Silver Nanoparticles as Colorimetric Probe for the Simultaneous and Sensitive Detection of Aluminum(III) and Fluoride Ions

“…In this regard, noble metal nanoparticles such as silver nanoparticles (AgNPs) and gold nanoparticles (AuNPs) have been extensively employed as efficient color signal generators in the fabrication of various colorimetric sensors. − AuNPs and AgNPs have attracted significant research interest in the design of colorimetric sensors because of their easy probe preparation, fast response, unique optical properties (surface plasmon resonance (SPR)), and flexibility in synthesis approaches. To date, a significant number of AgNP- and AuNP-based colorimetric probes for the detection of metal ions, − herbicides, , and proteins , have been reported.…”