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Keywords = gold–silver-alloy-embedded silica nanoparticles

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11 pages, 2418 KiB  
Article
Facile Histamine Detection by Surface-Enhanced Raman Scattering Using SiO2@Au@Ag Alloy Nanoparticles
by Kim-Hung Huynh, Xuan-Hung Pham, Eunil Hahm, Jaehyun An, Hyung-Mo Kim, Ahla Jo, Bomi Seong, Yoon-Hee Kim, Byung Sung Son, Jaehi Kim, Won-Yeop Rho and Bong-Hyun Jun
Int. J. Mol. Sci. 2020, 21(11), 4048; https://doi.org/10.3390/ijms21114048 - 5 Jun 2020
Cited by 29 | Viewed by 4520
Abstract
Histamine intoxication associated with seafood consumption represents a global health problem. The consumption of high concentrations of histamine can cause illnesses ranging from light symptoms, such as a prickling sensation, to death. In this study, gold–silver alloy-embedded silica (SiO2@Au@Ag) nanoparticles were [...] Read more.
Histamine intoxication associated with seafood consumption represents a global health problem. The consumption of high concentrations of histamine can cause illnesses ranging from light symptoms, such as a prickling sensation, to death. In this study, gold–silver alloy-embedded silica (SiO2@Au@Ag) nanoparticles were created to detect histamine using surface-enhanced Raman scattering (SERS). The optimal histamine SERS signal was measured following incubation with 125 μg/mL of SiO2@Au@Ag for 2 h, with a material-to-histamine solution volume ratio of 1:5 and a phosphate-buffered saline-Tween 20 (PBS-T) solvent at pH 7. The SERS intensity of the histamine increased proportionally with the increase in histamine concentration in the range 0.1–0.8 mM, with a limit of detection of 3.698 ppm. Our findings demonstrate the applicability of SERS using nanomaterials for histamine detection. In addition, this study demonstrates that nanoalloys could have a broad application in the future. Full article
(This article belongs to the Special Issue Silver Nano/Microparticles: Modification and Applications 2.0)
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11 pages, 1777 KiB  
Article
4-Mercaptobenzoic Acid Labeled Gold-Silver-Alloy-Embedded Silica Nanoparticles as an Internal Standard Containing Nanostructures for Sensitive Quantitative Thiram Detection
by Xuan-Hung Pham, Eunil Hahm, Kim-Hung Huynh, Byung Sung Son, Hyung-Mo Kim, Dae Hong Jeong and Bong-Hyun Jun
Int. J. Mol. Sci. 2019, 20(19), 4841; https://doi.org/10.3390/ijms20194841 - 29 Sep 2019
Cited by 46 | Viewed by 6398
Abstract
In this study, SiO2@Au@4-MBA@Ag (4-mercaptobenzoic acid labeled gold-silver-alloy-embedded silica nanoparticles) nanomaterials were investigated for the detection of thiram, a pesticide. First, the presence of Au@4-MBA@Ag alloys on the surface of SiO2 was confirmed by the broad bands of ultraviolet-visible spectra [...] Read more.
In this study, SiO2@Au@4-MBA@Ag (4-mercaptobenzoic acid labeled gold-silver-alloy-embedded silica nanoparticles) nanomaterials were investigated for the detection of thiram, a pesticide. First, the presence of Au@4-MBA@Ag alloys on the surface of SiO2 was confirmed by the broad bands of ultraviolet-visible spectra in the range of 320–800 nm. The effect of the 4-MBA (4-mercaptobenzoic acid) concentration on the Ag shell deposition and its intrinsic SERS (surface-enhanced Raman scattering) signal was also studied. Ag shells were well coated on SiO2@Au@4-MBA in the range of 1–1000 µM. The SERS intensity of thiram-incubated SiO2@Au@4-MBA@Ag achieved the highest value by incubation with 500 µL thiram for 30 min, and SERS was measured at 200 µg/mL SiO2@Au@4-MBA@Ag. Finally, the SERS intensity of thiram at 560 cm−1 increased proportionally with the increase in thiram concentration in the range of 240–2400 ppb, with a limit of detection (LOD) of 72 ppb. Full article
(This article belongs to the Special Issue Silver Nano/Microparticles: Modification and Applications 2.0)
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