Development of core‐satellite‐shell structured MNP@Au@MIL‐100(Fe) substrates for surface‐enhanced Raman spectroscopy and their applications in trace level determination of malachite green in prawn

Abstract

Malachite green (MG) abuse in aquaculture has caused food safety issues and surface‐enhanced Raman scattering (SERS) can be utilized to monitor MG residues in aquatic products. However, the sensitivity and accuracy of SERS detection are limited by food matrix interference. Therefore, in this study, SERS active MNP@Au@MIL‐100(Fe) substrates were developed by utilizing magnetic nanoparticle (MNP) as the core, which was evenly decorated with Au nanoparticles (AuNPs), and then coated with metal–organic frameworks (MOFs) shell of MIL‐100(Fe), which acted as a filter to only allow molecules with appropriate sizes to approach the inner AuNPs, thus avoiding food matrix interference and improving the identification ability to analytes. Experiments in detecting MG residues in prawns was realized with the limit of detection (LOD) of 1.32 × 10−10 M, showing great potential for its use as a reliable SERS substrate for monitoring food contaminants.

Gold nanoparticle decorated blu‐ray digital versatile disc as a highly reproducible surface‐enhanced Raman scattering substrate for detection and analysis of rotavirus RNA in laboratory environment

“…The characteristic Raman peaks of BPE at 1018 and 1334 cm −1 are attributed to ring breathing and CH in‐plane bending while the peaks at 1196, 1606, and 1634 cm −1 are attributed to CC stretching, CN bending of the pyridyl ring and CC stretching, respectively [51–53]. Again the characteristic peaks of MG at 422, 796, 1172, 1216, 1390, and 1614 cm −1 are attributed to out‐of‐plane vibrations of phenyl‐C‐phenyl, out‐of‐plane bending of ring CH, in‐plane vibration of ring CH, rocking of CH, stretching vibrations of N‐phenyl and in‐plane stretching vibration of ring CC, respectively [54–57]. The experimental data further revealed that the SERS spectra of BPE and MG are slightly different from the situation when they are considered in powder form [51, 56].…”

A new and highly efficient CuMOF-based nanoenzyme and its application to the aptamer SERS/FL/RRS/Abs quadruple-mode analysis of ultratrace malachite green

“…Recently, a number of novel and advanced analytical techniques for MG have been proposed, [39][40][41] such as SERS and ratiometric fluorescence sensors. Pu et al 42 prepared a complex nanomaterial that included magnetic nanoparticles, Au nanoparticle, and an Fe metal-organic framework to detect MG with a limit of detection (LOD) of 1.32 × 10 −10 M. Despite the great progress made in this area in terms of the accuracy, the development of new easy-to-operate, sensitive, and low-cost sensing methods for MG is still worth further exploration in order to ensure food safety. In this work, a new efficient CuNM nanoenzyme was prepared using CuMOF as a precursor, and a novel SERS/RRS/ FL/Abs quadruple-mode assay for MG was constructed by coupling the new CuNM-TMB-H 2 O 2 nano-indication reaction with the Apt reaction.…”

Are morphologies of SERS active substrates multifractals? An in‐depth study from multifractal detrended fluctuation analysis

“…[ 6–14 ] Although understanding the influence of near‐field plasmonic architectures of the substrates on the far‐field SERS spectra has been a matter of explicit concern these days, [ 8,15,16 ] the other avenue in this area of research is deeply focused on the fabrication of highly efficient and reproducible SERS active substrates. [ 10,17–22 ] Successful fabrications of such substrates in a way will allow not only to use them as reliable “lab‐on‐chip” for diagnostic applications but also may help to contemplate closely on the mechanism behind the SERS phenomena.…”