Determination of detergent and dispensant additives in gasoline by ring-oven and near infrared hypespectral imaging

Brito, Lívia Rodrigues e; Silva, Michelle P.F. da; Rohwedder, Jarbas José R.; Pasquini, Célio; Honorato, Fernanda Araújo; Pimentel, Maria Fernanda

doi:10.1016/j.aca.2014.12.052

Cited by 19 publications

(5 citation statements)

References 14 publications

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“…SERS applications are largely dependent on SERS-active substrates to produce enhanced Raman signals. − Considering that, developing effective SERS-active substrates for SERS detection is urgently needed. However, complex matrix interference in practical samples has a serious effect on SERS detection because nonselective Raman enhancement greatly hinders spectral analysis. − To settle this problem, selecting efficient pretreatment methods or hyphenated techniques has been proven to be effective to extract/enrich target analyses and eliminate the interference of a complex matrix. − Among these methods/techniques, magnetic solid-phase extraction (MSPE), combining magnetic separation and solid-phase extraction (SPE), can greatly simplify pretreatment, strengthen SERS signal, and reduce the influence originated from the sample matrix. Consequently, MSPE-based SERS substrates have attracted continuous attention in practical sample detection with the consideration of high time-efficiency and concentration-dependent signal enhancement of target molecules. ,− Fabricating efficient MSPE-based SERS active substrates integrates rapid pretreatment, enrichment/separation, and detection ability all-in-one and is crucial in realizing on-site detection.…”

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confidence: 99%

CoFe₂O₄@HNTs/AuNPs Substrate for Rapid Magnetic Solid-Phase Extraction and Efficient SERS Detection of Complex Samples All-in-One

Zhang

Lai

et al. 2020

Anal. Chem.

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Fast and accurate practical sample detection is a great challenge in on-site detection. Herein, we developed a CoFe2O4@HNTs/AuNPs substrate for rapid and efficient magnetic solid-phase extraction (MSPE) surface-enhanced Raman scattering (SERS) detection of aromatic amines and nitrofuran in real samples all-in-one. Magnetic CoFe2O4 beads filled inside halloysite nanotubes (HNTs) can avoid aggregation of particles, endow the substrate with the rapid magnetic separation ability to simplify the pretreatment procedure, and reduce complex matrix interference. Meanwhile, outer surface AuNPs can generate electromagnetic enhancement and hot spots to amplify Raman signals of target molecules enriched/concentrated by HNTs. The CoFe2O4@HNTs/AuNPs substrate exhibited excellent SERS activity (high sensitivity, good reproducibility, and repeatability), pH stability (3.0–11.0), and good MSPE ability (fast magnetic enrichment/separation ability within 5 min). The CoFe2O4@HNTs/AuNPs MSPE SERS substrate can be applied for the determination of 4,4′-thioaniline and nitrofurantoin with a linear range of 0.054–21.7 mg/L and 0.05–1.0 mg/L, and the limits of detection were down to 0.026 mg/L and 0.014 mg/L, respectively. Furthermore, the enhancement factor (EF) of the substrate to 4,4′-thioaniline is up to 2.7 × 107. Besides, the substrate can realize practical SERS determination of trace 4,4-thioaniline in cosmetics and nitrofurantoin in fish feed and aquatic samples. The recoveries were varied from 71.6% to 103.6% for 4,4-thioaniline in hair dyes and 81.9% to 116.3% for nitrofurantoin in fish feed and aquatic samples, respectively. Such a robust and efficient MSPE SERS substrate possesses great potential in rapid detection (within 15 min) for a practical sample, and it also provides a methodology for the preparation of other HNTs-based composites.

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confidence: 99%

CoFe₂O₄@HNTs/AuNPs Substrate for Rapid Magnetic Solid-Phase Extraction and Efficient SERS Detection of Complex Samples All-in-One

Zhang

Lai

et al. 2020

Anal. Chem.

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“…After extracting the mask, it was multiplied with the whole hypercube to extract the spectral information of pixels related to ROI as shown in Figure 1. To remove the noise, Standard Normal Variate (SNV), Multiplicative Scatter Correction (MSC), Smoothing with Savitzky Golay method, and averaging filter were used [21,[38][39][40]. Based on visual inspection, the Savitzky Golay smoothing filter performed well for noise removal.…”

Section: Pre-processingmentioning

confidence: 99%

Hyperspectral Imaging for Bloodstain Identification

Zulfiqar

Ahmad

Sohaib

et al. 2021

Sensors

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Blood is key evidence to reconstruct crime scenes in forensic sciences. Blood identification can help to confirm a suspect, and for that reason, several chemical methods are used to reconstruct the crime scene however, these methods can affect subsequent DNA analysis. Therefore, this study presents a non-destructive method for bloodstain identification using Hyperspectral Imaging (HSI, 397–1000 nm range). The proposed method is based on the visualization of heme-components bands in the 500–700 nm spectral range. For experimental and validation purposes, a total of 225 blood (different donors) and non-blood (protein-based ketchup, rust acrylic paint, red acrylic paint, brown acrylic paint, red nail polish, rust nail polish, fake blood, and red ink) samples (HSI cubes, each cube is of size 1000 × 512 × 224, in which 1000 × 512 are the spatial dimensions and 224 spectral bands) were deposited on three substrates (white cotton fabric, white tile, and PVC wall sheet). The samples are imaged for up to three days to include aging. Savitzky Golay filtering has been used to highlight the subtle bands of all samples, particularly the aged ones. Based on the derivative spectrum, important spectral bands were selected to train five different classifiers (SVM, ANN, KNN, Random Forest, and Decision Tree). The comparative analysis reveals that the proposed method outperformed several state-of-the-art methods.

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“…The residues accumulated at the border and a thin ring profile was formed. Nowadays, the ring-oven technique has been used in laser-induced breakdown spectroscopy, near-infrared hyperspectral imaging, and surface-enhanced Raman spectroscopy. , Our group has developed a continuous nonspecific binding protein washing protocol on the paper-based chip using the ring-oven technique. The washing protocol has also been reported in Jin’s work for gas pressure detection of multiple microRNAs on the paper-based chip.…”

Section: Introductionmentioning

confidence: 99%

Ring-Oven-Assisted In Situ Synthesis of Metal–Organic Frameworks on the Lab-On-Paper Device for Chemiluminescence Detection of Nitrite in Whole Blood

Hou

Guo

et al. 2023

Anal. Chem.

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In situ synthesis of metal–organic frameworks (MOFs) on flexible materials for the fabrication of functional platforms and micro-devices is challenging. The time-/precursor-consuming procedure and uncontrollable assembly are stumbling blocks for constructing this platform. Herein, a novel in situ MOF synthesis method on paper substrates by use of the ring-oven-assisted technique was reported. Utilizing the ring-oven’s heating and washing function, MOFs can be synthesized in 30 min on the designated position of paper chips with extremely low-volume precursors. The principle of this method was explained by steam condensation deposition. The MOFs’ growth procedure was theoretically calculated by crystal sizes and the results conformed to the Christian equation. As different MOFs (Cu-MOF-74, Cu-BTB, Cu-BTC) can be synthesized successfully on paper-based chips, the ring-oven-assisted in situ synthesis method has great generality. Then, the prepared Cu-MOF-74 loading paper-based chip was applied to the chemiluminescence (CL) detection of nitrite (NO2 –), based on the catalysis effect of Cu-MOF-74 on the NO2 ––H2O2 CL system. Also, by the delicate design of the paper-based chip, NO2 – can be detected with the detection limit (DL) of 0.5 nM in whole blood samples without sample pretreatment. This work establishes a distinctive method for the in situ synthesis of MOFs and the application of MOFs on paper-based CL chips.

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Determination of detergent and dispensant additives in gasoline by ring-oven and near infrared hypespectral imaging

Cited by 19 publications

References 14 publications

CoFe₂O₄@HNTs/AuNPs Substrate for Rapid Magnetic Solid-Phase Extraction and Efficient SERS Detection of Complex Samples All-in-One

CoFe₂O₄@HNTs/AuNPs Substrate for Rapid Magnetic Solid-Phase Extraction and Efficient SERS Detection of Complex Samples All-in-One

Hyperspectral Imaging for Bloodstain Identification

Ring-Oven-Assisted In Situ Synthesis of Metal–Organic Frameworks on the Lab-On-Paper Device for Chemiluminescence Detection of Nitrite in Whole Blood

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Determination of detergent and dispensant additives in gasoline by ring-oven and near infrared hypespectral imaging

Cited by 19 publications

References 14 publications

CoFe2O4@HNTs/AuNPs Substrate for Rapid Magnetic Solid-Phase Extraction and Efficient SERS Detection of Complex Samples All-in-One

CoFe2O4@HNTs/AuNPs Substrate for Rapid Magnetic Solid-Phase Extraction and Efficient SERS Detection of Complex Samples All-in-One

Hyperspectral Imaging for Bloodstain Identification

Ring-Oven-Assisted In Situ Synthesis of Metal–Organic Frameworks on the Lab-On-Paper Device for Chemiluminescence Detection of Nitrite in Whole Blood

Contact Info

Product

Resources

About

CoFe₂O₄@HNTs/AuNPs Substrate for Rapid Magnetic Solid-Phase Extraction and Efficient SERS Detection of Complex Samples All-in-One

CoFe₂O₄@HNTs/AuNPs Substrate for Rapid Magnetic Solid-Phase Extraction and Efficient SERS Detection of Complex Samples All-in-One