Food Analytical Methods
·
2020
·Vol. 14
·期 1
·165-171
·
IF 2.667
Li Xiaozhou,Wang Xinnuo,Wang Lianyan,Yang Tianyue,Wang Deli
Nowadays, the overuse of antibiotics in cow breeding is a common issue worldwide. Real-time monitoring is critical for antibiotic control of dairy products. Herein, we report a rapid detection method for the duplex detection of two beta-lactam antibiotics (cephalexin and ampicillin) in milk powder using lateral flow (LF) combined with surface-enhanced Raman spectroscopy (SERS). The duplex detection was accomplished using a single test line loaded with two antigens targeting the two corresponding antibody-gold-Raman reporter conjugates. The obtained SERS spectra contributed by the Raman reporter labeled to the two antibodies were analyzed using both peak height method and multiple linear regression (MLR). A good regression fitting was achieved by these two methods ( R 2 = 0.99 and 0.98, respectively). The limit of detection (LOD) was 10 −4 ng/mL for both peak height method and MRL. This study indicated that LF-SERS is a good candidate for real-time multiplex and quantitative analysis for antibiotics in dairy products.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 25
·期 1
·672-682
·
IF 2.741
Shi Xue-Ting,Liu Yong-Ze,Tang Yu-Qing,Feng Li,Zhang Li-Qiu
UV/chlorine, as a novel disinfection method, has attracted great interest due to its effective removal for pathogenic microorganism and degradation of trace organic contaminants existed in water environment. This paper investigated the degradation kinetics and pathways of Bezafibrate (BZF), a typical antilipemic drug, during UV/chlorine process. The results showed that 92.3% of BZF was degraded after 20 min in UV/chlorine process. This indicated HO• and reactive chlorine species (RCSs) formed in UV/chlorine played the dominant role in degrading BZF. Observed rate constants of BZF degradation ( k
obs,BZF ) in UV/chlorine process increased linearly in a wide chlorine dosage from 0.1 to 1.0 mM, which implied that ClO• generated from the reactions of chlorine with HO• and Cl• could react with BZF rapidly. The steady-state kinetic modeling result proved this deduction and the rate constant of ClO• with BZF was fitted to be 5.0 × 10 8 M −1 s −1 . k
obs,BZF was affected by Cl − and HA. The total contribution of RCSs (including Cl•, Cl 2 • − , and ClO•) to the degradation of BZF was determined to be ~ 80%, which is much higher than that of HO•. Thirteen degradation products of BZF were identified by LC-MS/MS. Initial degradation products were arisen from hydroxylation, chlorine substitution and cyclization by HO• and RCSs, and then further oxidized to generate acylamino cleavage and demethylation products.
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EUROPEAN JOURNAL OF NUTRITION
·
2022
·Vol. 62
·期 2
·615-631
·
IF 4.865
Wu Simou,Ren Lei,Li Jinxing,Shen Xi,Zhou Qingqing,Miao Zhonghua,Jia Wen,He Fang,Cheng Ruyue
Purpose This study was aimed to determine how delivery mode and feeding pattern influence the infant’s gut microbiota construction and the variation of fecal microbial metabolites from a birth cohort. Methods Fecal samples collected from 61 full-term born Chinese infants at four time points: day 0, day 7, month 1, and month 3. Based on delivery mode (vaginal delivery [V] or cesarean section [C]) and feeding pattern (breastfeeding [B] or mixed feeding [M]), infants were divided into four groups, namely VB, CB, VM, and CM groups. The gut microbiota composition and bacterial diversity were assessed using 16S rRNA sequencing. Short-chain fatty acid (SCFA) concentrations were determined via gas chromatography–mass spectrometry (GC–MS). Results The CM group had a significantly higher relative abundance of Firmicutes (day 0 and month 1), Enterococcaceae (month 3), and Enterococcus (month 3) than the VB group and a significantly higher abundance of Firmicutes (month 1) and Blautia (month 3) than the CB group. The VB and CB groups exhibited a stable SCFA variation and a significantly lower level of propionate compared with the VM and CM groups. All groups showed an intense transition of enterotypes within 1 month and became stable at 3 months. The correlation between SCFA and enterotypes showed a significant positive correlation between Bifidobacteriaceae and acetate in the CB group (day 7 and month 3) and a significant positive correlation between Clostridiaceae and butyrate in the CB and VB groups (day 7 and month 3), respectively. Conclusion These results indicated that C-section was associated with higher abundance of the phylum Firmicutes and family Enterococcaceae , and intense fluctuation of SCFA, at least propionate. And breastfeeding might partially contribute to gut microbiota construction and stabilization propionate metabolism in cesarean-section infants.
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Frontiers of Environmental Science & Engineering
·
2023
·Vol. 17
·期 11
·1-12
·
IF 6.4
Chen Meiling,Yin Mengjie,Su Yuetan,Li Ruizhe,Liu Kezhou,Wu Zhongbiao,Weng Xiaole
Despite the large emission of chlorinated volatile organic compounds (CVOCs) into the atmosphere, the ultimate fate of these compounds remains largely unknown. Herein, we explore the photochemical conversion of an important class of CVOCs, namely chlorobenzene (CB), on mineral α-Fe 2 O 3 particulates under atmospheric relevant conditions. A series of chamber reactions composed of the CB with/without SO 2 or NO 2 are performed, followed by in situ diffuse reflectance infrared Fourier transform spectroscopy measurements and density functional theory calculations. We show that CB can be considerably degraded by α-Fe 2 O 3 under light irradiation, whereas the reaction is markedly suppressed by adding SO 2 or NO 2 owing to their competitive adsorption and surface acidification. In particular, we discover that CB can be ultimately converted into polychlorinated dibenzo- p -dioxins and dibenzofurans (PCDD/Fs) under dark state or light irradiation, suggesting a possible origin of atmospheric PCDD/Fs from this overlooked photochemical source.
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Science China-Chemistry
·
2022
·Vol. 65
·期 10
·2038-2044
·
IF 10.138
Wang Yanan,Pei Chunlei,Zhao Zhi-Jian,Gong Jinlong
Rational design and performance promotion are eternal topics and ultimate goals in catalyst preparation. In contrast, trial—and—error is still the common method people take. Therefore, it is important to develop methods to intrinsically enhance the performance of catalysts. The most effective solutions are the one from a kinetic perspective based on clear knowledge of the reaction mechanism. This paper describes rate-determining step cognition and modulation to promote CO oxidation on highly dispersed Pt on CeO 2 . The different degrees of metal—support interactions due to variation of hydroxyl density of support could alter the structure of active species and the ability of oxygen activation apparently, further shift the rate-determining step from oxygen activation to oxygen reverse spillover kinetically. The transformation of rate-determining step could enhance the intrinsic activity significantly, and decrease the T 50 approximately 140 °C. The findings of this research exemplify the universal and effective method of performance elevation by rate-determining step modulation, which is promising for application in different systems.
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MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 7
·2249-2254
·
IF 4.58
Huang Conghui,Wang Shuzhan,Zhao Wenfeng,Zong Chenghua,Liang Aiye,Zhang Qingquan,Liu Xiaojun
The authors describe a colorimetric approach for on-site monitoring of histamine based on the use of gold nanoparticles (AuNPs) that have a negatively charged surface due to the presence of adsorbed citrate ions. Histamine has two basic functional groups, an aliphatic amino group and an imidazole ring. Under the experimental conditions, the protonated aliphatic amino group drives the imidazole ring into close proximity to the AuNPs due to electrostatic attraction. This accelerates the replacement of citrate ions by the imidazole ring because of the strong affinity between imidazole and AuNPs. As a consequence, the two groups synergistically induce the aggregation of the AuNPs and trigger a visible color change from red to blue. The minimum visually detectable histamine concentration is 1.81 μM, which is comparable to the limit of detection (LOD) of the electrochemical approaches at a signal-to-noise ratio of 3:1. When using absorbance at 522 nm, the LOD is lowered to 38 nM. The method was applied to the determination of histamine in fish samples.
Schematic of the detection scheme: Histamine induces gold nanoparticle aggregation and triggers a visible color change. The minimum visually detectable histamine concentration by bare eye is 1.81 μM. When using absorbance at 522 nm, the LOD is lowered to 38 nM.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 11
·11683-11696
·
IF 3.056
Li Zhenyuan,Pan Zhidong,Wang Yanmin
Ternary amino-functionalized magnetic illite-smectite (AMNI/S) nanocomposites were prepared via integrating two-dimensional illite-smectite nanoflakes (NI/S), magnetite nanoparticles (Fe 3 O 4 ), and 3-aminopropyltriethoxysilane (APTES). The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and vibrating sample magnetometry (VSM). The results show that Fe 3 O 4 nanoparticles can be well dispersed on NI/S flakes and the hydrolyzed APTES molecules can simultaneously bond to the hydroxyl groups of Fe 3 O 4 and NI/S. Due to the synergetic effect, magnetic NI/S composite can graft more amount of APTES molecules rather than Fe 3 O 4 nanoparticles or NI/S alone. When the mass ratio of NI/S:Fe 3 O 4 is 1:1, the saturation magnetization of AMNI/S-1 is 17.4 emu/g, facilitating the efficient magnetic separation in aqueous solution. Also, AMNI/S-1 shows a maximal adsorption amount of Pb(II) ions of 227.8 mg/g calculated by the Langmuir model. The effects of initial concentration of Pb(II) ions, pH value, adsorption time, and temperature on the adsorption amount of Pb(II) ions were investigated. The adsorption kinetic models and isotherm models were applied to analyze the adsorption of Pb(II) ions, respectively. The thermodynamic analysis reveals that the adsorption of Pb(II) onto AMNI/S-1 is spontaneous and endothermic in nature. The mechanism for the adsorption of Pb(II) ions onto AMNI/S-1 is due to the surface complexation of Fe 3 O 4 and NI/S, and the chelation of amine groups (–NH 2 ). AMNI/S-1 can be efficiently reused and the regenerated AMNI/S-1 remains 82.91% of initial adsorption capacity after 6-cycle adsorption/desorption process. Thus, ternary AMNI/S-1 could be used as a prospective effective adsorbent.
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International Journal of Minerals Metallurgy and Materials
·
2023
·Vol. 30
·期 9
·1740-1747
·
IF 4.8
Cai Dawei,Zhang Li,Wang Wanlin,Zhang Lei,Sohn Il
Mold flux serves the crucial metallurgical function of absorbing inclusions, directly impacting the smoothness of the casting process as well as the cast slab quality. In this study, the dissolution behavior and mechanism of TiO 2 and TiN inclusions in molten CaO–SiO 2– B 2 O 3 -based fluorine-free mold flux were explored by in situ single hot thermocouple technology combined with X-ray photoelectron spectroscopy. The results showed that TiO 2 inclusions are effectively dissolved by the molten slag within 76 s, during which the original octahedral [TiO 6 ] 8− structures are destroyed and convert to the networker tetrahedral [TiO 4 ] 4− structures. However, the dissolution rate is much lower for TiN inclusions than for TiO 2 inclusions. This can be attributed to the fact that the TiN particles need to be oxidized and then dissolved in the molten slag to form tetrahedral [TiO 4 ] 4− and octahedral [TiO 6 ] 8− structures during the TiN inclusion dissolution process, which is accompanied by the generation of a large amount of N 2 gas. Moreover, CaTiO 3 crystals tend to nucleate and grow on bubble surfaces with sufficient octahedral [TiO 6 ] 8− structures and Ca 2+ ions, eventually resulting in the molten slag being in a solid–liquid mixed state.
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Frontiers of Chemical Science and Engineering
·
2019
·Vol. 14
·期 2
·267-274
·
IF 2.809
Xu Hao,Lei Chi,Wu Qinming,Zhu Qiuyan,Meng Xiangju,Dai Daniel,Maurer Stefan,Parvulescu Andrei-Nicolae,Müller Ulrich,Xiao Fengshou
SSZ-39 zeolite with AEI framework structure is a good catalyst candidate for the methanol-to-olefins (MTO) reaction. However, the diffusion limitation and coke formation often results in fast deactivation of the SSZ-39 zeolite catalyst. One solution for this challenge is to introduce mesoporosity in the SSZ-39 zeolite. Herein, we report the synthesis of mesoporous SSZ-39 zeolite using an organosilane surfactant, N , N -dimethyl- N -(3-(trimethoxysilyl)propyl)octan-1-aminium chloride, as a mesopore template and N , N -dimethyl- cis -2,6-dimethylpiperidinium as a micropore template. The obtained zeolites were characterized by X-ray diffraction, N 2 sorption, scanning electron microscopy, temperature programmed desorption of ammonia, and magic angle spinning nuclear magnetic resonance of 27 Al. The results show that the mesoporous SSZ-39 zeolite has high crystallinity, meso/microporosity, high surface area, cuboid morphology, and abundant acidic sites. More importantly, this mesoporous SSZ-39 zeolite exhibits enhanced catalyst lifetime in the MTO reaction due to the presence of mesoporosity for fast mass transfer, compared with a conventional SSZ-39 zeolite without mesoporosity.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2018
·Vol. 135
·期 4
·2317-2328
·
IF 2.209
Yin Xin,Li Jie,Zhang Guojie,Gu Hao,Ma Qing,Wang Shumin,Wang Jun
N -trinitromethyl-4,5-dicyano-2 H -1,2,3-triazole was readily synthesized from 4,5-dicyano-2 H -1,2,3-triazole. Its crystal structure was obtained for the first time and its crystalline density in 296 K was 1.729 g cm −3 . It shows high nitrogen and oxygen content up to 77.6%, high calculated solid heat of formation (564 kJ mol −1 ), and superior detonation pressure and detonation velocity ( D = 8619 m s −1 , P = 30.8 GPa). This new hydrogen-absent explosive shows high impact and friction sensitivities ( IS : 1.25 J, FS : 32 N), which is lower than commercial primary explosive 2-diazonium-4,6-dinitrophenol (DDNP) ( IS : 1 J, FS : 5 N). The relationship between intermolecular interaction and sensitivity as well as thermal stability of the title compound was investigated by Hirshfeld surface analysis and fingerprint plot. Its thermodynamic properties were studied by non-isothermal kinetic methods based on the results of differential scanning calorimeter. It is interesting that apparent activation energy ( E a ) at T p1 (210.89–214.17 kJ mol −1 ) is higher than those at T p2 (133.90–134.87 kJ mol −1 ). In addition, gaseous product of this new energetic compound was analyzed by the rapid scanning Fourier transform infrared spectroscopy from 20 to 200 °C and its detonation products was theoretically predicted. Based on the decomposition products, its decomposition mechanism was discussed under inert atmosphere. It is undoubted that these significant physicochemical properties make N -trinitromethyl-4,5-dicyano-2 H -1,2,3-triazole a potential hydrogen-absent primary explosive.
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Journal of Inorganic and Organometallic Polymers and Materials
·
2019
·Vol. 30
·期 4
·1011-1032
·
IF 1.637
Cid A.,Simal-Gandara J.
In recent decades, the industrial use of nanoparticles (NPs) and, especially, metal nanoparticles (MNPs), has attracted widespread attention because of their special physicochemical properties. The ability of MNPs to self-arrange into ordered, nanometrically sized structures and form nanometric colloids has enabled their use as nanocatalysts the properties of which can be tailored through ordered growth of their crystal structures. In fact, these nanocatalysts provide a unique opportunity to tune material properties at the nanometric scale. Thus, altering the size or shape of the nanoparticles allows materials of identical composition but different properties to be obtained. The versatility of MNPs (and, especially, those containing the transition metals copper, nickel and palladium) led us to review their synthetic procedures, most salient physicochemical properties, and existing and potential applications (chemical sensing and plasmon resonance included).
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-12
·
IF 16.6
Wang Wei,Chen Shan,Liao Xuelong,Huang Rong,Wang Fengmei,Chen Jialei,Wang Yaxin,Wang Fei,Wang Huan
In situ formation of a stable interphase layer on zinc surface is an effective solution to suppress dendrite growth. However, the fast transport of bivalent Zn-ions within the solid interlayer remains very challenging. Herein, we engineer the SEI components and enable superior kinetics of Zn metal batteries under harsh conditions through regulating the sequence of interfacial chemical reaction. With the differences in chemical reactivity of trimethyl phosphate co-solvent and trifluoromethanesulfonate anions in the Zn 2+ -solvation shell, Zn 3 (PO 4 ) 2 and ZnF 2 are successively generated on Zn metal surface to form a gradient ZnF 2 –Zn 3 (PO 4 ) 2 interphase. Mechanistic studies reveal the outer ZnF 2 facilitates Zn 2+ desolvation and inner Zn 3 (PO 4 ) 2 serves as channels for fast Zn 2+ transport, contributing to long-term cycling at subzero temperatures. Impressively, the gradient SEI enables a high lifespan over 7000 hours in Zn symmetric cell and a capacity retention of 86.1% after 12000 cycles in Zn–KVOH full cell at –50 °C.
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