SPECTROSCOPY LETTERS
·
2019
·
IF 1.081
Xinhui Zhou,Zhen Li,Yinfeng Hao,Qingling Duan,Cong Wang,Tan Wang,Daoliang Li
Malachite green is not used in aquaculture owing to its severe toxic effects on humans and other living organisms. The presence of this compound in fishery water should be quantified and reported in all water quality reports. In this paper, a method based on surface-enhanced Raman scattering combined with partial least squares regression for rapid, accurate, reliable, and sensitive detection of trace malachite green in fishery water is described. A prepared sol of 100-nm-size gold particles was used as an active substrate for Raman spectral data acquisition. Three parameters that affect detection, namely, the volume of gold nanoparticles (400 µL), the volume of sodium chloride (300 µL), and the adsorption time (8 min) were optimized in single-factor experiments. Under the optimal condition, the proposed method demonstrated a wide linear range of detectable concentrations (0.01–5.0 µmol/L) and the limit of detection was 2.7 × 10−9 M. The proposed method successfully detected spiked malachite green in fishery water samples, with satisfactory recoveries and relative standard deviations. Thus, this study suggests a rapid, simple, accurate, and sensitive approach for detecting malachite green residues in fishery water samples, which is promising for wide applications in environmental monitoring and food safety.
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Biomed Research International
·
2018
·
IF 2.583
Juan Huang,Yun Yang,Yaokun Wang,Mingyang Zhang,Youxun Liu
The application of laccase-mediator-based catalysis is limited owing to the high cost of laccases and mediators and the potential toxicity of free mediators. Here, a novel biocatalyst (Im-LMS) was fabricated by immobilizing both laccase and a mediator (2,2’-azino-bis-[3-ethylbenzothiazoline]-6-sulfonic acid) on layered double hydroxide/alginate biohybrid beads. The catalytic activity of Im-LMS was evaluated for dye decolorization using malachite green. The decolorization yields of malachite green by Im-LMS and the free laccase-mediator system were 92% within 120 min and 90% within 90 min. Malachite green solution was detoxified completely after biodegradation by Im-LMS. Following eight reuse cycles of Im-LMS for dye treatment, a decolorization yield of 79% was obtained. The activity of Im-LMS was almost completely stable after being stored for 10 days. The recyclability and stability of Im-LMS will be helpful for reducing the running cost and potential toxicity associated with mediators to facilitate practical applications.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 7
·1-10
·
IF 5.3
Li Wenhao,Liu Fang,He Yu,Song Gongwu
Sulfur-doped BCNO quantum dots (S-BCNO QDs) emitting green fluorescence were prepared by elemental doping method. The ratiometric fluorescence probe with dual emissions was simply established by mixed S-BCNO QDs with gold nanoclusters (GSH-Au NCs). Because the emission spectrum of Au NCs (donor) at 615 nm overlapped well with the ultraviolet absorption of malachite green (MG), fluorescence resonance energy transfer (FRET) can be achieved. When the concentration of MG increased, the fluorescence intensity ( F 495 ) of S-BCNO QDs decreased slowly, while the fluorescence intensity ( F 615 ) of Au NCs decreased sharply. The fluorescence intensity ratio of F 615 / F 495 decreased with the increase of MG. By plotting the F 615 / F 495 values against MG concentration, a sensitive and rapid detection of MG was possible with a wide detection range (0.1–50 µM) and a low detection limit of 10 nM. Due to the accompanying fluorescence color change from pink to blue-green, it can be used for visual detection. A three dimensional-printing device utilizing digital image colorimetry to capture color changes through the built-in camera, enables quantitative detection of MG with a good linearity between the values of red/green ratio and MG concentrations at the range 1–50 µM. This sensing platform had a range of advantages, including high cost-effectiveness, portability, ease of operation, and high sensitivity. Furthermore, the sensing platform was successfully applied to the detection of MG in real water sample and fish samples, thereby verifying the reliability and effectiveness of this sensing platform in water quality monitoring and food safety. Graphical Abstract
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 3
·1-12
·
IF 5.3
Wang Hongjun,Bian Ziyang,Wang Yue,Yang Zhenshan,Niu Huijuan,Li Hefu
A dual-functional biomimetic surface-enhanced Raman scattering (SERS) substrate composed of grating/microcavity arrays (GCA) was developed for on-site monitoring of pesticides on fruit peels and in surface water. The hierarchical GCA structure was fabricated by molding a negative polydimethylsiloxane (PDMS) replica from lily petals, followed by the generation of grating wrinkles through oxygen plasma treatment. After the deposition of silver nanoparticles (Ag NPs) through magnetron sputtering, the optimal Ag NPs@GCA substrate exhibits high sensitivity, good uniformity, and reproducibility. Moreover, due to its optical transparency, mechanical stability, and hydrophobic properties, the Ag NPs@GCA substrate combined with a handhold Raman spectrometer can be used for on-site determination of pesticides in real samples. The limit of detection (LOD) for thiram on the surfaces of apples, pears, and cherry tomatoes were 2.86 × 10 −7 , 5.03 × 10 −7 , and 7.25 × 10 −7 M, respectively. For malachite green, the LODs were 9.04 × 10 −8 M in lake water and 4.83 × 10 −7 M on fish scales. The results indicate the developed dual-functional Ag NPs@GCA substrate has great potential for applications in food safety assessment and environmental pollutant monitoring. Graphical abstract
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JOURNAL OF SEPARATION SCIENCE
·
2024
·Vol. 47
·期 11
·2400013
·
IF 2.8
Bingmei Lai,Haoyun Hu,Ningli Tang,Yipeng Huang,Guihua Ruan
In this study, monodisperse, uniform, and spherical covalent organic frameworks (COFs) were synthesized using 1,3,5-tris (4-aminophenyl) benzene and 1,3,5-tricarboxaldehyde benzene at room temperature. Post-modification of 6-aminocaproic acid on the COFs yielded carboxyl-modified COFs (COFs-COOH). The modification enhanced the hydrophilicity and adsorption efficiencies of COFs-COOH for malachite green (MG) and crystal violet (CV). A COFs-COOH-based dispersive solid-phase extraction coupled with high-performance liquid chromatography was developed for the analysis of MG and CV. The method showed a linear range from 10 to 1000 ng/mL with detection limits of 1.82 and 0.70 ng/mL for MG and CV detection, respectively. The recoveries of MG and CV from water samples collected from fish farms and markets ranged from 91.63% to 107.10% with relative standard deviations below 5%. Reproducibility tests demonstrated that the adsorption efficiencies of COFs-COOH were maintained at above 85.86% over 15 cycles. The study verified the potential of COFs-COOH as sorbents for the enrichment and separation of triphenylmethane dyes from complex samples.
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Journal of Chromatography Open
·
2024
·
IF 0
Jinya Cao,Yuxia Shen,Zhaixin Liu,Shanshan Zhu,Huihui Wu,Yali Dang,Tianhua Li,Ning Gan
Triphenylmethane (TPM) fish drug residues and their metabolites exist in many aquiculture waters and can cause significant harm to consumers. Rapid, accurate, and simultaneous detection of their residues in foods is significant in protecting the safety of aquatic products. In the study, a new type of polydopamine coated polydimethylsiloxane (PDMS-PDA) stir bar was prepared for the automatic sorptive extraction and enrichment of malachite green, leucomalachite green, crystal violet, and leucocrystal violet which are common TPM drugs used in aquaculture. The surface of PDMS matrix was first turned to hydrophilic by plasma treatment to enhance the evenness and stability of PDA coating. Therefore, the PDMS-PDA stir bar can enhance its extraction capacity and selectivity towards TPMs. These were due to the synergisitic adsorption capacities of PDA and PDMS towards the dyes. A hand-held stirring device was installed with the stir bar for on-site extraction. After that, a portable mass spectrometer directly detected the eluted targets without chromatography separation. Under the optimized conditions. The four analytes' lower detection limit of 0.16–0.38 μg L -1 was obtained. Within 35 min, the stir bar device, combing with a portable mass spectrometer, was used for rapid pretreatment and real sample analysis of four analytes with a recovery of 84.3–110 %. All these prove that the assay exhibited potential application prospects for the on-site detection of TPM residues in aquatic waters.
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MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Jiangru Wang,Yan Yang,Qirui Shen,Dazhong Shen,Qi Kang
Imprinted cavities are the cornerstones for the recognition specificity of molecularly imprinted polymers (MIPs). But the investigations related to the recognition behavior of imprinted cavities within MIPs are scarce due to the inevitable non-specific adsorption on the outside surface of MIPs. Herein, we reported a differential strategy to investigate the pure specific adsorption into imprinted cavities within MIPs, demonstrated by using for malachite green (MG) as the model template. The adsorption isotherm and kinetics of MG into the imprinted cavities are determined by a differential colorimetry. A smartphone-based analytical device with rotating seven colorimetric tubes was fabricated to measure the absorbance on-line, monitoring simultaneously the amounts of MG adsorbed in six channels without terminating adsorption processes. The pure specific recognition by imprinted cavities within MIPs enhances the anti-interference ability and sensitivity for MG determination. The smartphone-based absorbance device with an optical path of 10 cm was applied to the field determination of MG in actual water samples, with the detection limit of 1.1 μg L −1 and the recovery in the range of 94.1 ∼ 105%. The difference in volume of eluent has little influence on absorbance measurement in the portable absorbance device.
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JOURNAL OF RAMAN SPECTROSCOPY
·
2022
·Vol. 53
·期 4
·682-693
·
IF 2.727
Hongbin Pu,Haofan Zhu,Fang Xu,Da-Wen Sun
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.
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ANALYTICAL LETTERS
·
2023
·
IF 2
Zheqi Fei,Baisen Chen,Xuemei Wei,Lili Lian,Xiyue Wang,Dawei Lou
Developing highly efficient adsorbents toward trace pollutant analysis in complex biological samples is a challenge in analytical chemistry. Herein, NiO/ZnO-coated carbon microspheres (denoted by NiO/ZnO@C) with a well-defined core–shell structure were prepared through hydrothermal treatment and subsequent pyrolysis in air to enrich malachite green (MG) and crystal violet (CV). Hydrophilic carbon microspheres played an important role in the formation of core–shell NiO/ZnO@C, which may lead to the deposition of Ni2+/Zn2+ upon the surface via acidic chelating ligands. Based on the Langmuir model, NiO/ZnO@C demonstrated high adsorption capacities of 333.3 and 192.3 mg/g for MG and CV, respectively. Moreover, the NiO/ZnO@C composite served as a dispersive solid-phase extraction adsorbent to determine MG and CV in aquatic products combined with ultra-high performance liquid chromatography. High linearity was obtained for analyte concentrations from 5 to 500 μg/L with correlation coefficients (r) exceeding 0.9991. The limits of detection of the method were 0.50 μg/L (MG) and 0.35 μg/L (CV) with relative standard deviations less than 7.47%. Furthermore, the developed method was employed to determine MG and CV in aquatic products.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Shuguang Li,Jize Liu,Haibo Wu,Xinxin Zhang,Yanqiong Guo,Boyang Kang,Limin Zhao
Photocatalytic hydrogen production with simultaneous degradation of organic pollutants by using solar energy provide a promising strategy to solve the energy and environmental issue in the future. However, for onefold wide band-gap semiconductor, the poor photocatalytic efficiency limits its application on a large scale due to its easy recombination of photo-generated electron-hole pairs and low solar energy utilization. Herein, a novel Z-scheme BiVO 4 (040)-Bi-(NaYF 4 :Er,Yb,Tm@BiOBr)/Bi photocatalyst is prepared via photo-assisted isoelectric point method. In this composite photocatalyst, up-convention luminescence material, NaYF 4 :Er,Yb,Tm, can offer more ultraviolet light and visible light to intensify the activations of BiOBr and metal Bi nanoparticles, respectively. Furthermore, the formation of Z-scheme BiVO 4 (040)-BiOBr photocatalystic sytem, the spatial separation of the BiVO 4 (040) and BiVO 4 (110) facets and the presence of metal Bi surface plasmon resonance effect are contributed to the high-efficiency separation of the photo-generated electron-hole pairs. The experimental results show that as-prepared Z-scheme BiVO 4 (040)-Bi-(NaYF 4 :Er,Yb,Tm@BiOBr)/Bi photocatalyst exhibits advanced photocatalytic hydrogen production amount (192.0 μm) and excellent degradation ratio of malachite green (88.51 %) under simulated sunlight irradiation for 5.0 h. The apparent quantum yield of the Z-scheme BiVO 4 (040)-Bi-(NaYF 4 :Er,Yb,Tm@BiOBr)/Bi photocatalyst at 420 nm reaches a specific value of 5.8 %. In addition, Z-scheme BiVO 4 (040)-Bi-(NaYF 4 :Er,Yb,Tm@BiOBr)/Bi photocatalyst also remains a high stability in the photocatalytic hydrogen production with simultaneous degradation of malachite green within six reuse. At last, the possible reaction mechanism and degradation pathways of malachite green caused by Z-scheme BiVO 4 (040)-Bi-(NaYF 4 :Er,Yb,Tm@BiOBr)/Bi photocatalyst under simulated sunlight irradiation are put forward.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 3
·1-9
·
IF 5.479
Lai Huasheng,Shang Wenjuan,Yun Yuyin,Chen Danjiao,Wu Liqian,Xu Fugang
Magnetite (Fe 3 O 4 ) spheres acting as a core were evenly decorated with gold nanoparticles (AuNPs) and coated with a shell of a metal organic framework (MOF) of type MIL-100(Fe). The resulting hybrid nanomaterial of type Fe 3 O 4 -Au@MIL-100(Fe) hybrid is shown to be a viable new SERS substrate. The integration of magnetic core, build-in plasmonic gold nanoparticles and a MOF shell endows the Fe 3 O 4 -Au@MIL-100(Fe) with highly efficient magnetic separation and enrichment ability, abundant interparticle hotspots, and significant chemical enhancement effect. This leads to a large enhancement, and greatly improved reproducibility of the SERS signals as shown for Malachite Green (MG) and the fungicide thiram. MG in solution can be quantified with a 50-fold lower detection limit (0.14 nM for peak at 1398 cm −1 ) and largely improved reproducibility (RSD = 9%, 1398 cm −1 ) when compared to the use of (a) AuNPs anchored on MIL-100(Fe) (RSD = 27%, 1186 cm −1 ), or (b) AuNPs embedded in MIL-100(Fe) (RSD = 36%, 1398 cm −1 ). The method was applied to the quantitation of MG and thiram in spiked water samples. The lower limits of detection are 4.4 nM for MG (1398 cm −1 ) and 15 nM for thiram (1380 cm −1 ), respectively, and signals’ RSDs are 13% (1398 cm −1 ) and 5% (1380 cm −1 ) for MG and thiram, respectively. The substrate is recyclable.
Schematic illustration of the preparation and SERS molecule sensing application of Fe 3 O 4 -Au@MIL-100(Fe) hybrid. PMMA: poly(methacrylic acid; BPEI: branched poly(ethyleneimine); BTC: 1,3,5-tricarboxybenzene.
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危险品化学品经营许可证（带存储）