ANALYTICAL CHEMISTRY
·
2017
·
IF 6.32
Jingni Fu,Luning Zhang
Relying on the nanometer-thick water core and large surface area-to-volume ratio (∼2 × 108 m–1) of common black film (CBF), we are able to use a pH-sensitive dye (carboxy-seminaphthorhodafluor-1, SNARF-1) to detect ammonia and acetic acid gas adsorption into the CBF, with the limit of detection reaching 0.8 ppm for NH3 gas and 3 ppb for CH3COOH gas in the air. Data analysis reveals that fluorescence signal change is linearly proportional to the gas concentration up to 15 ppm and 65 ppb for NH3 and CH3COOH, respectively.
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高影响因子
MOLECULES
·
2024
·Vol. 29
·期 19
·4691
·
IF 4.2
Wei Lan,Wei Cheng,Ruilong Li,Mei Zhang,Mengmeng Li,Yuan Zhang,Yibin Zhou
Fruit wine production is a practical approach for extending the shelf life and enhancing the value of strawberries (Fragaria×ananassa). Fruit cultivars and juices are important sources of volatile organic compounds (VOCs) that determine fruit wine sensory quality. In this study, VOCs in the juices and wines of four strawberry cultivars were identified using two-dimensional gas chromatography-time-of-flight mass spectrometry, and a sensory analysis of the wines was performed. A total of 1028 VOCs were detected. PCA and OPLS-DA distinguished the four cultivars from which the juices and wines were made. Six VOCs with variable importance in projection values greater than one were the main aroma and flavor components of strawberry wines. ZJ wine had the highest sensory scores for coordination (9.0) and overall evaluation (8.9) among the 18 descriptors of strawberry wine evaluated. Overall, the ZJ wine had the highest alcohol content (13.25 ± 0.59%,v/v) and sensory evaluation score, indicating that the ZJ cultivar is more suitable for fermentation. This study reflects the differences between wines made from four strawberry cultivars and provides a reference for brewing fruit wines.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2025
·
IF 7.8
Bing Wang,Wei Ma,Yuan Chen,Yujia Gao,Guojun Hu,Guochuan Luo
Drilling solid waste (DSW) is a typical byproduct of drilling operations in oil and gas fields. The characteristics of DSW are influenced by both the background soil properties and any added additives. Heavy metal (HM) contamination, particularly cadmium (Cd 2 + ), poses a significant environmental challenge due to its toxicity to nearly all living organisms, including plants. DSW samples from the Tarim Oilfield, Xinjiang, China, were analyzed for HM content and its form distribution. The total Cd content was 48 mg/kg, with 41.1 % as unstable HM and 58.9 % as stable HM, exceeding the standard (DB 65/T 3997–2017). Conventional methods for remediating HM-contaminated soil, such as chemical washing and adsorption, are commonly used. X-ray diffraction (XRD) analysis revealed that the DSW has a crystalline carbonate structure, which is disrupted when treated with strong acids. Thus, in this study, a modified self-floating magnetic hollow glass microsphere (FHGM) was employed to remediate HM-contaminated DSW without the use of acidic washing agents. FHGM has a hollow structure, floats within 30 s, and possesses a saturation magnetization near 9, allowing for effective self-flotation and magnetic response, which facilitate its separation from the DSW. The results show that when the solution pH was 8, contact time was 240 min, the dosage of Fe 3 O 4 was 0.6 g and the proportion of heavy metals to FHGM= 100:1, the removal efficiency of Cd from DSW using FHGM reached 78.8 %. Notably, the removal rate of HMs from the FeMn and OM fractions was high, indicating that FHGM enhances the migration of stable HMs. Furthermore, using centrifugal force at 17,232 x g, Cd and FHGM were effectively separated, with the material being recycled up to five times, FHGM still retain approximately 73.2 % of their initial adsorption capacities. Therefore, enhanced separation of stable-state Cd from DSW using FHGM presents an effective new treatment technology. The preparation of FHGM also means that it provides a new green and economic treatment method for the remediation of heavy metal pollution in the solid phase (not limited to DSW).
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JOURNAL OF SEPARATION SCIENCE
·
2020
·Vol. 43
·期 20
·3940-3948
·
IF 2.878
Yuanji Gao,Yunan Qin,Feng Xiong,Lijuan Zhao
Polycyclic aromatic hydrocarbons, ubiquitous compounds that result from incomplete combustion or pyrolysis of natural and man-made combustion sources, can adversely affects human health due to their well-known toxicity. This paper demonstrates the significant potential of graphene/chitosan composite aerogels as solid-phase extraction sorbents for efficient polycyclic aromatic hydrocarbon extraction and material for the highly sensitive analysis in environmental samples using gas chromatography–mass spectrometry in selective ion monitoring mode. Under the optimal condition, samples spiked with polycyclic aromatic hydrocarbons were determined at the pg/mL level in different aqueous sample matrices, including tap water, river water, and milk. The results showed that the prepared aerogels have excellent adsorption capability for 16 target analytes. The limits of detection ranged from 1.7 to 8.8 pg/mL. The recoveries of polycyclic aromatic hydrocarbons spiked in river water ranged from 85.9 to 113%, with relative standard deviations of 1.1–6.6%. The sorbent was reused for multiple polycyclic aromatic hydrocarbon extractions using a single solid-phase extraction cartridge in the concentration range of 10–2000 pg/mL. The method provides excellent correlation coefficients over 0.9990. These results indicate the capability of this method to determine trace polycyclic aromatic hydrocarbons in any water matrix.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Xiaoqiang Wang,Yue Liu,Zhongbiao Wu
Low-medium temperature NH 3 -SCR technology has been applied for years in municipal solid wastes incineration (MSWI) to control the emissions of nitrogen oxides . Unlike coal-fired flue gases , the tail gas from MSWI contains high levels of heavy metals in fly ash, especially the zinc species, which may harm SCR catalysts. As such, in this paper, the deactivation mechanism of different zinc species (ZnO, ZnSO 4 and ZnCl 2 ) on the Sb-CeZr 2 O x catalysts and the co-effects of zinc species and gas-phase pollutants (including SO 2 and HCl) were investigated. The experimental results indicated that the deactivation rate of various poisoning zinc species was in the order of ZnCl 2 > ZnSO 4 > ZnO. Moreover, the interactions between zinc and antimony species would disrupt the structure of the Sb-Ce mixed oxides to decrease the redox ability, consequently suppressing the ammonia activation and NO adsorption. Furthermore, such damaging effects on catalyst structures would promote the formation of bulk-like sulfate species in the presence of SO 2 , resulting in a decreased mobility of surface oxygen species, which significantly decrease the sulfur resistance. However, the presence of HCl did not show an evident co-effect on the Zn poisoned sample owing to the limited coverage of the chlorine deposition.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Jiannan Yin,Jinliang Li,Yanke Lu,Yehong Han,Hongyuan Yan
Polyhalogenated carbazoles (PHCZs), originating from the production and use of halogenated indigo dyes, photoelectric materials, and p-chloraniline structure herbicides, pose a threat to water environments, aquatic products, and consequently human health. Therefore, establishing an accurate detection method for PHCZs in aquatic products is of paramount importance. In this study, trace PHCZs (36-CCZ, 36-BCZ, and 1368-BCZ) in water chestnut were detected for the first time using the prepared polyvinyl alcohol-functionalized graphene aerogel (PGA) as a novel adsorbent for dispersive filter extraction (DFE), coupled with vortex assisted solvent extraction (VASE), followed by gas chromatography-tandem mass spectrometry (GC–MS/MS). The extraction process (VASE-DFE) has the advantages of good purification effect, short extraction time (<15 min), and low adsorbent dosage (1.0 mg). This method demonstrated excellent linearity in the range of 0.10/0.50/1.00–200 ng/g for the three PHCZs (R 2 ≥ 0.9995), and the recoveries at three spiked levels (2, 20, 100 ng/g) ranged from 82 % to 93 %, with relative standard deviations (RSDs) ≤ 7.4 %. Notably, the method outperforms previously reported adsorbents in terms of RSDs, adsorbent dosage, and extraction time. The VASE-DFE-GC–MS/MS method provides a new approach for the detection of trace pollutants in complex samples, introduces a novel technology for environmental and food safety monitoring, and contributes to enhancing food safety supervision.
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Food Bioscience
·
2024
·
IF 4.8
Xueliang Zhang,Changliang Zhang,Luyao Xiao,Xiaochan Wang,Kai Ma,Feng Ji,Elham Azarpazhooh,Marjan Ajami,Xin Rui,Wei Li
This study comprehensively evaluated the effects of Lactiplantibacillus plantarum T1 and CSK (ropy and non-ropy phenotypes), on flavour, and nutrient metabolites of fermented milks using gas chromatography-mass spectrometry and non-targeted metabolomics. The microrheological analysis showed that the protein gelation time of CSK fermented milk was earlier (5.2 h) than that of T1 (7.0 h), while the fermented milk by T1 had higher elastic modulus. Fermentation by both strains significantly enhanced the antioxidant activity of the fermented milk, including scavenging capabilities against ABTS, DPPH, and hydroxyl radicals. Meanwhile, fermentation by two strains produced various volatile flavor compounds (hexanoic acid, caprylic acid, capric acid, nonanal, decanal, 2-heptanone and 2-nonanone, etc.), and L. plantarum CSK displayed more stronger acid production capacity. In addition, a total of 397 shared metabolites and 81 unique metabolites were identified by untargeted metabolomics analysis of the two groups of fermented milks, mainly including lipids and lipid-like molecules (66, 27.27%), organic heterocyclic compounds (40, 16.53%), phenylketones and polyketones (23, 9.5%), and organic acids and their derivatives (49, 20.25%). Furthermore, both strains significantly elevated the amino acid nutritional levels in the fermented milk, conferred an abundance of active metabolites such as niacin and nicotinamide. During the fermentation, L. plantarum CSK notably produced antioxidant fumaric acid and exhibited higher fatty acid metabolism compared to L. plantarum T1. Overall, this study provides some practical basis for the development of fermented cow's milk with good antioxidant activity and high nutritional quality using different phenotypes of L. plantarum .
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JOURNAL OF CHROMATOGRAPHY A
·
2021
·
IF 4.759
Caiming Tang,Jianhua Tan,Caixing Tang,Huachun Liu,Peilin Zhang,Deyun Liu,Xianzhi Peng
Compound-specific isotope analysis of chlorine (CSIA-Cl) is a practicable and high-performance approach for revelation of transformation processes and source identification of chlorinated organic pollutants. This study conducted CSIA-Cl for typical polychlorinated organic pollutants using gas chromatography-high resolution mass spectrometry (GC HRMS) with an alternate injection mode using perchloroethylene (PCE) and trichloroethylene (TCE) as model analytes. PCE and TCE standards from two manufacturers were employed for method development, and chlorine isotope ratio calculation schemes were evaluated by experiment and numerical simulation. The achieved precision (standard deviation of isotope ratios) was up to 0.21‰ for PCE and 0.43‰ for TCE. The limits of detection for CSIA-Cl of were 0.05 μg/mL (0.05 ng on column), and the linearities were 0.05–1 μg/mL. Two isotope ratio calculation schemes, i.e., one using complete molecular isotopologues and another using the first pair of neighboring chlorine isotopologues of each analyte, were evaluated in terms of accuracy and precision. The complete-isotopologue scheme showed evidently higher precision and was more competent to reflect trueness than the isotopologue-pair scheme and the two schemes could present completely different outcomes. The method has been successfully applied to PCE and TCE reagents from different suppliers, a trichloromethane reagent, and a plastic material. The relative isotope ratio variations (Δ 37 Cl) of PCE and TCE in the reagents and plastic material were from −1.84±0.7‰ to 15.12±0.85‰. The analytes from different sources could mostly be discerned from each other by chlorine isotope ratios. This study will be conducive to transformation process elucidation and source identification of for PCE and TCE, and facilitate CSIA-Cl using GC–MS for more polychlorinated organic pollutants, particularly in selection and optimization of isotope ratio calculation schemes.
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高影响因子
FUEL
·
2025
·
IF 7.5
Yongpeng Ma,Jianghui Du,Yifei Wu,Haobing Yan,Ruiqi Liu,Xiaojing Zhang,Hongzhong Zhang,Liming Zhou,Wenjun Huang
Among the diverse pollutants emitted from coal-fired and non-ferrous metal smelting flue gas, Hg 0 and CO have emerged as globally concerning environmental pollutants. However, the simultaneous abatement of multiple pollutants remains a critical challenge to be addressed. In this study, cobalt nanoclusters (Co NCs) were anchored on the terminal oxygen of Ti-O on Ti 3 C 2 MXene and formed asymmetric oxygen vacancies Co-Ov-Ti via a one-step hydrothermal method, yielding Co NCs/Ti 3 C 2 MXene with a morphology of hierarchical nanosheet-assembled spheres for Hg 0 and CO catalytic oxidation. Co NCs/Ti 3 C 2 MXene exhibited excellent 44 % and 52 % of Hg 0 and CO simultaneous removal efficiency at the optimal temperature of 250 °C, respectively. DFT calculations combined with energy barrier modeling were employed to investigate the reaction pathways and energy variations during the catalytic oxidation of Hg 0 and CO. Specifically, Hg 0 oxidation follows the Eley-Rideal mechanism, with a rate-determining energy barrier of 2.11 eV, while CO oxidation adheres to the Langmuir-Hinshelwood mechanism, featuring a rate-determining barrier of 0.17 eV. In the co-catalytic oxidation process, competitive adsorption between Hg 0 and CO was observed, primarily manifested as competition for Ov on the catalyst surface. This study provides a novel strategy for the synergistic control of multi-pollutants in industrial flue gas.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Laishui Yu,Liye Huang,Zhuangyuan Wang,Yuhao Xiong,Gongke Li,Zhengyi Chen
This study presents a novel Pressure-Resistant and Portable Array Gas Membrane Separation (PAGMS) device for the rapid, smartphone-based detection of Escherichia coli ( E. coli ) in infant milk powder. The PAGMS device efficiently separates acetic acid, a byproduct of E. coli growth, enhancing detection sensitivity. Utilizing bromocresol violet as an indicator, this method quantifies E. coli based on colorimetric changes, with UV spectrum absorbance shifts indicating a linear correlation (R 2 = 0.9864) within 5.0–120 μmol/L acetic acid concentration. Visual MINTEQ simulations validate the mechanism behind the indicator’s response. The approach surpasses traditional plate culture methods in terms of sample preparation time, achieving detection within a comparable timeframe of 15 min, and can concurrently process up to 48 samples, thereby substantially enhancing analytical throughput while detecting E. coli with a limit of detection of 5 cfu/g. This method demonstrates enhanced sensitivity, speed, and high-throughput capabilities, offering significant advantages in food safety monitoring.
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JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
·
2026
·
IF 2.9
Jun Huang,Zhiwei Wen,Tianci Xiao,Shijun Gao,Guangqi Wang,Yihan Tang,Minggao Xu,Chengyuan Liu,Yang Pan
In situ synchrotron radiation photoionization mass spectrometry (SR-PIMS) is a powerful tool for detecting gas-phase species including intermediates and products in gas–solid catalytic reactions. However, achieving sensitive and more comprehensive monitoring of gas-phase compounds with different ionization energies in a single measurement remains a significant challenge. In this work, a multiphysics ion trajectory simulation integrating a coupled computational fluid dynamics-direct simulation Monte Carlo (CFD-DSMC) method for continuum-rarefied flow was carried out for tracing the ion motion within the ionization region. The simulation results were applied to the design of the cage lens assembly of a modified SR-PIMS, and a limit of detection (LOD) of 0.67 ppbv (S/N ≥ 3) was achieved under Kr-lamp calibration conditions for toluene. Furthermore, a residual gas analyzer (RGA) was coupled to the SR-PIMS for the complementary detection of organic products with low ionization energies (IEs, generally lower than 11 eV) and H2, CO, CO2 etc. with higher IEs, thereby reducing the need for separate measurements at multiple photon energies. The optimized SR-PIMS setup combined with RGA was successfully applied to probe the intermediates and products generated during the methanol-to-hydrocarbons (MTH) reaction over ZnO/HZSM-5 catalysts, and the time-evolved profiles for major species under different ZnO loadings were obtained and analyzed.
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ANTONIE VAN LEEUWENHOEK INTERNATIONAL JOURNAL OF GENERAL AND MOLECULAR MICROBIOLOGY
·
2026
·Vol. 119
·期 9
·205
·
IF 2
Raj Pranay,Sharma Harshit Kumar,Selvaraj Venkatesan,Pandey Abhay Kumar
The present research investigates the chemical profile of secondary metabolites produced by Bacillus paramycoides BOK01 and Microbacterium barkeri BPATH02 rhizospheric bacteria originating from the tea rhizosphere and their antifungal activity against major tea pathogens. GC–MS analysis revealed that dimethyl sulphate (77.09%) was a major compound (Compound I ) of B. paramycoides BOK01 and 1H-Purin-6-amine, [(2-fluorophenyl) methyl- (CAS) (Compound II; 16.88%), and docosane (Compound III; 11.75%) as putative major compounds in M. barkeri BPATH02. Furthermore, the ethyl acetate extract of both bacterial antagonists and compounds I, II , and III were evaluated for their efficacy against major tea pathogens, namely Exobasidium vexans , Pseudopestalotiopsis theae, and Fusarium concentricum causing respective blister blight, gray blight, and Fusarium dieback in tea crops using two-sealed-base-plate method. Laboratory screening of ethyl acetate (EA) extracts of both bacterial antagonists at 200 µg/mL provided a 65.95 to 82.5% range of growth inhibition of tested pathogens. At similar dose, compounds I, II, and III provided 70.88 to 77.53%, 67.7 to 78.0% and 71.8 to 73.07% range of growth inhibition of tested pathogens, respectively. Thus, this study shows that bacterial metabolites and their compounds are sources of putative antifungal agents, which can be harnessed for bio-fungicides development against tea diseases.
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