Evaluation of cigarette flavoring quality <i>via</i> surface-enhanced Raman spectroscopy

Xu, Shaonan; Wen, Bo; Zhang, Lína; Zhang, Hua; Gao, Yang; Bodappa, Nataraju; Xu, Li-Ping; Wang, Xin; Li, Jianfeng; Zhang, Tian

doi:10.1039/c8cc05689g

Cited by 10 publications

(11 citation statements)

References 31 publications

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“…In recent years, the detection of single explosives or groups with specific motifs has become possible. Systematically MOF networks are functionalized with ligands, which offer stronger interactions between the analyte and the network . Specific interactions of such a host–guest system lead to a higher content of interacting analyte inside the pore system.…”

Section: Trace Gas Enrichment and Sensingmentioning

confidence: 99%

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Adsorption and Detection of Hazardous Trace Gases by Metal–Organic Frameworks

et al. 2018

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The quest for advanced designer adsorbents for air filtration and monitoring hazardous trace gases has recently been more and more driven by the need to ensure clean air in indoor, outdoor, and industrial environments. How to increase safety with regard to personal protection in the event of hazardous gas exposure is a critical question for an ever-growing population spending most of their lifetime indoors, but is also crucial for the chemical industry in order to protect future generations of employees from potential hazards. Metal-organic frameworks (MOFs) are already quite advanced and promising in terms of capacity and specific affinity to overcome limitations of current adsorbent materials for trace and toxic gas adsorption. Due to their advantageous features (e.g., high specific surface area, catalytic activity, tailorable pore sizes, structural diversity, and range of chemical and physical properties), MOFs offer a high potential as adsorbents for air filtration and monitoring of hazardous trace gases. Three advanced topics are considered here, in applying MOFs for selective adsorption: (i) toxic gas adsorption toward filtration for respiratory protection as well as indoor and cabin air, (ii) enrichment of hazardous gases using MOFs, and (iii) MOFs as sensors for toxic trace gases and explosives.

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Section: Trace Gas Enrichment and Sensingmentioning

confidence: 99%

“…By functionalization of UiO‐66 with 2‐aminoterephthalic acid (UiO‐66‐NH 2 ) instead of terephthalic acid, the detection of nitroaromatic explosives with hydroxyl groups is possible . In particular, the detection of 2,4‐DNP (2,4‐dinitrophenol) was successful by quenching of the MOF fluorescence properties.…”

Section: Trace Gas Enrichment and Sensingmentioning

confidence: 99%

Adsorption and Detection of Hazardous Trace Gases by Metal–Organic Frameworks

et al. 2018

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“…Surface-enhanced Raman scattering (SERS) has been increasingly adopted for chemical and biological sensing of various species at very low concentrations due to the extraordinary enhancement factors (EFs) from plasmonic nanostructures [12][13][14]. In recent years, SERS techniques have also been applied to illicit drug detection [15][16][17][18][19]. For instance, our group used hybrid photonic crystal-plasmonic SERS substrates, which were fabricated by depositing silver nanoparticles (Ag NPs) into diatom photonic crystals [13,20].…”

Section: Introductionmentioning

confidence: 99%

Tetrahydrocannabinol Sensing in Complex Biofluid with Portable Raman Spectrometer Using Diatomaceous SERS Substrates

2019

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Using thin-layer chromatography in tandem with surface-enhanced Raman spectroscopy (TLC-SERS) and tetrahydrocannabinol (THC) sensing in complex biological fluids is successfully conducted with a portable Raman spectrometer. Both THC and THC metabolites are detected from the biofluid of marijuana-users as biomarkers for identifying cannabis exposure. In this article, ultra-sensitive SERS substrates based on diatomaceous earth integrated with gold nanoparticles (Au NPs) were employed to detect trace levels of cannabis biomarkers in saliva. Strong characteristic THC and THC metabolite SERS peaks at 1601 and 1681 cm−1 were obtained despite the moderate interference of biological molecules native to saliva. Urine samples were also analyzed, but they required TLC separation of THC from the urine sample to eliminate the strong influence of urea and other organic molecules. TLC separation of THC from the urine was performed by porous microfluidic channel devices using diatomaceous earth as the stationary phase. The experimental results showed clear separation between urea and THC, and strong THC SERS characteristic peaks. Principal component analysis (PCA) was used to analyze the SERS spectra collected from various THC samples. The spectra in the principal component space were well clustered for each sample type and share very similar scores in the main principal component (PC1), which can serve as the benchmark for THC sensing from complex SERS spectra. Therefore, we proved that portable Raman spectrometers can enable an on-site sensing capability using diatomaceous SERS substrates to detect THC in real biological solutions. This portable THC sensing technology will play pivotal roles in forensic analysis, medical diagnosis, and public health.

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“…Many methods have been proposed to remove the 2,4-DNP from aqueous solutions including advanced oxidation, 1 electrochemical oxidation, [2][3][4] biodegradation, [5][6][7] ultrasonic degradation, [8][9][10][11] photodegradation, [12][13][14][15] electro/AIS/PS process, 16 and adsorption. [17][18][19][20][21][22][23][24][25][26][27] The adsorption process has attracted worldwide attention due to its simple implementation and low operation cost. The reported adsorbents include carbons activated by KOH, HNO 3 H 3 PO 4 and ZnCl 2 , 17 olive wood biosorbents, 18 UiO-66-NH 2 , 19 glycidyl methacrylate graed cotton cellulose, 20 yellow bentonite, 21 XAD-4 resin, 22 activated carbon bers, 23 layered double hydroxides and their calcined products, 24 carbon nanospheres, 25 date seeds 26 and active carbon.…”

Section: Introductionmentioning

confidence: 99%

“…[17][18][19][20][21][22][23][24][25][26][27] The adsorption process has attracted worldwide attention due to its simple implementation and low operation cost. The reported adsorbents include carbons activated by KOH, HNO 3 H 3 PO 4 and ZnCl 2 , 17 olive wood biosorbents, 18 UiO-66-NH 2 , 19 glycidyl methacrylate graed cotton cellulose, 20 yellow bentonite, 21 XAD-4 resin, 22 activated carbon bers, 23 layered double hydroxides and their calcined products, 24 carbon nanospheres, 25 date seeds 26 and active carbon. 27 In recent years, ionic liquid-modied silicas (IL-silicas) as adsorbents have been widely used to remove Cu(II), Fe(III), Mn (II) and Ni(II), 28 Pb(II), [29][30][31] Cr(III,VI), [32][33][34] lanthanides and scandium ions, 35 oxymatrine, 36 bovine serum albumin, 37 racemic amino acids, 28 thiophenic sulfur compounds, 38 anionic dye, 39,40 dibenzothiophene 41 and phenolic compounds (4-chlorophenol, 42 polyphenols, 43 phenolic acids, 44 naphthols, 45 bisphenol A 46 and 2,4-DNP [47][48]…”

Section: Introductionmentioning

confidence: 99%