RARE METALS
·
2025
·
IF 11
Jiang Xue,Qu Dan-Yao,Zhang Jun-Nan,Kloper Viki,Zhang Ke-Fan,Zhang Guang-Jian,Wang Lei,Pan Ming-Hu,Guo Quan-Min,Chen Li,Huang Wei-Tian,Gao Jian-Zhi,Haick Hossam,Wu Wei-Wei
The field of disease smelling diagnosis has experienced a major breakthrough with the development of the electronic nose (E-nose) that utilizes thiol-capped gold nanoparticles (GNPs). This study focuses on overcoming the challenges of sensors to detect VOCs stably confounding with interferents of humidity and pressure, and clarifying their essential mechanism. An innovative and straightforward method for synthesizing GNPs and modifying their surface has been developed. This unique approach deviates from the conventional Brust method by completely removing any traces of tetraoctylammonium bromide (TOAB), ensuring reproducibility and simplicity of use. This modification enhances the sensor’s responsiveness to both polar and non-polar VOCs, as well as strengthen selectivity and anti-interferant capabilities. The mechanism of generating sensing cross-talk from TOAB residue is proposed through rigorous sensing experiments, X-ray photoelectron spectroscopy (XPS) results, and theoretical analysis. Thus, this study enhances the responsiveness of the sensor to both polar and non-polar VOCs, while also strengthening its selectivity and anti-interferent capabilities. This could potentially revolutionize the practical applications of E-nose in smelling diagnosis. Graphical abstract
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ENERGY
·
2025
·
IF 9.4
Xiaomeng Yang,Zhen Zhang,Xiangang Li,Jianshe Wang,Dan Wu,Yongsheng Zhang,Chunbao Charles Xu
The production of phenolic monomers from agricultural waste biomass is environmentally friendly, economical, and sustainable. Here, we synthesized floral-like Ni-Co alloy catalysts via hydrothermal method for hydrodeoxygenation (HDO) of corn stalk lignin (CSL) to phenolic monomers. The optimized Ni 1 Co 2 Al-LDO-500 catalyst exhibits excellent catalytic performance for HDO of CSL, with lignin oil and phenolic monomer yields as high as 63.37 wt% and 46.63 wt% at 240 °C, respectively. XRD and TEM characterization confirms the formation of Ni-Co alloys, and XPS analysis reveals that the electron transfer between Ni and Co in the catalysts enhances the efficient activation of H 2 and the hydrogenation breaking of C-O bonds. Moreover, the possible reaction pathways and reaction mechanisms of β-O-4 bonds hydrogen cleavage reaction over NiCoAl-LDO catalysts were elucidated by combining model reaction and 2D HSQC NMR analyses. Understanding the synergistic effect of Ni-Co alloy and acid site in NiCoAl-LDO catalysts in the HDO of CSL facilitates the efficient depolymerization of lignin for the production of phenolic products.
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JOURNAL OF CHROMATOGRAPHY A
·
2025
·
IF 4
Zhipeng Zhu,Min Zhang,Xiaohui Yan,Chenglong Shi,Bin Wang,Yanshuo Li,Dapeng Wu
A crosslinked polystyrene-divinylbenzene (PS-DVB) stationary phase was prepared onto silica gel with the pore size of 100 Å and 300 Å (SiL-PSD-10, SiL-PSD-30) by surface-initiated atom transfer radical polymerization (ATRP) for high performance liquid chromatography (HPLC) separation of alkylbenzenes, fullerites, and proteins, respectively. The SiL-PSD coating and the pore size distribution were characterized by FT-IR, TGA, and nitrogen adsorption-desorption isotherms. The crosslinking degree within stationary phase was determined in good consistency with the feeding ratio, as confirmed by RP-HPLC. It was found the SiL-PSD-10 particles could resist the harsh etching of 0.1 M NaOH for at least 6 h, while bare silica was totally dissolved and commercial C18 silica was partially dissolved under the same conditions. Under alkaline conditions (pH 11), the column bleeding rates of SiL-PSD-10 were reduced by 83 % and 96.0 % respectively compared to commercial C18 column and bare silica. Under accelerated aging conditions, SiL-PSD-10 maintained over 94 % of its initial column efficiency after exposure to 16,000 column volume of mobile phase. On SiL-PSD columns, alkylbenzenes could be separated in reversed-phase mode, and fullerite (C 60 /C 70 ) could be baseline resolved within 2 min with benzene as the mobile phase. During the continuous monitoring for 70 h, RSDs of the retention times of proteins were between 0.49 % and 1.19 %. Generally, SiL-PSD had been demonstrated to combine the excellent mechanical strength and uniform porosity of silica gel with the outstanding chemical resistance of PS-DVB, and could be used for HPLC separation across a wider pH.
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高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2025
·
IF 3.8
Yang Ruilin,Wang Ping,Guan Xinhui,Gu Xiaofei,Qiao Xiaoqiang
Phospholipids have been considered biomarkers for diagnosing many diseases in recent years. However, the isolation and analysis of phospholipids still face many difficulties. Styrene-maleic acid (SMA) copolymer is currently considered suitable for the separation and analysis of phospholipids due to its ability to enhance and improve the solubility of phospholipid bilayers on cell membranes. In this work, metal-free atom transfer radical polymerization was first exploited to graft SMA copolymer onto the surface of silica gel. With glycerol monolaurate (GML) as the derivatization reagent, Sil-SMA-GML polymer-brush silica-based stationary phase was first developed. The chromatographic retention mechanism revealed that the Sil-SMA-GML column is of hydrophilic/reversed-phase mixed-mode retention modes. The chromatographic separation performance evaluation indicated that the Sil-SMA-GML column had excellent separation capabilities for both hydrophilic and hydrophobic compounds. The maximum column efficiency was up to 78,600 N/m. The Sil-SMA-GML column could also achieve simultaneous separation and analysis of different phospholipid classes and species as well as complex phospholipid extracts from human serum and exosomal phospholipid extracts, demonstrating the good potential of the developed stationary phase. Graphical
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Foods
·
2025
·Vol. 14
·期 18
·3192
·
IF 5.1
Xiaomei Chen,Panpan Wu,Shuwei Wang,Jie Sun,Haitao Chen
In this study, we systematically characterize the volatile and non-volatile flavor profiles of coffee beans. Sensory evaluation demonstrated unique aromatic profiles for each coffee, with Colombia excelling in chocolate and nutty notes, while Bench Maji exhibited pronounced fruity characteristics. Yirgacheffe had a prominent roasted aroma, and Baoshan stood out for its stronger woody and caramel notes. The analysis employed solvent-assisted flavor evaporation (SAFE), gas chromatography–mass spectrometry/olfactometry (GC-MS/O), and high-performance liquid chromatography (HPLC). A total of 85 aroma compounds were identified, with furans, ketones, and pyrazines being the predominant contributors to roasted, nutty, and caramel aromas. Key aroma-active compounds, including furfural, guaiacol, and furaneol, exhibited the highest flavor dilution (FD) factors (up to 2187) and odor activity values, highlighting their pivotal roles in coffee aroma, with 4-vinyl-2-methoxyphenol (OAV = 761 in GL) and furaneol (OAV = 250 in BS) being particularly influential. Recombination and omission experiments validated the significance of these compounds. Non-volatile analysis revealed distinct differences in organic acids and chlorogenic acid content, with Colombia samples showing higher quinic acid levels, likely due to roasting-induced degradation. These findings provide a theoretical basis for understanding coffee flavor diversity and offer insights for quality assessment and origin identification.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2024
·Vol. 149
·期 10
·4491-4503
·
IF 3
Chen Yongjia,Zhao Yilin,Hua Min,Pan Xuhai,Jiang Huichun,Jiang Juncheng
We investigated the inhibition of thermal runaway of styrene polymerization by DNPB. DNBP is an inhibitor in styrene polymerization reaction. Polymerization is one of eighteen hazardous processes. Styrene polymerization reaction is characterized by high heat production and fast reaction rate. Firstly, differential scanning calorimetry (DSC) and adiabatic calorimetry (ARC) were chosen to study the effect of different mass of DNBP on thermal behavior in non-isothermal and adiabatic environments. Secondly, exploring the inhibitory effect of DNBP at different runaway temperatures using an oil bath reactor. The results showed that when DNBP was at 0.80%, effective inhibition was obtained at different runaway temperatures. Finally, GC/MS and Gauss16 were used to infer the mechanism of inhibition in terms of macroscopic products and microscopic instabilities. The results showed that the products of the oil bath reactor experiments were related to the mass of DNBP, and when DNBP was 0.80%, the products increased and the main reaction was inhibited. Finally, it was deduced that the nitro group undergoes a possible path of direct addition reaction with the styrene radical before bond breaking.
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APPLIED CATALYSIS A-GENERAL
·
2024
·
IF 4.7
Xiaofei Li,Lili Geng,Haifeng Shi,Songshou Ye,Ley Boon Sim,Jinbao Zheng,Nuowei Zhang,Binghui Chen
In this study, we utilized a sol-gel method to prepare Ni-HPW/SiO 2 catalysts with varying citric acid (CA):Ni molar ratios ranging from 0 to 5.0. The catalysts demonstrated different levels of activity in the hydrogenation of ethylbenzene , which correlated to their respective CA:Ni ratios. Introducing citric acid in the preparation process of nickel-based catalysts yielded mesopore formation and reduced NiO particle size, producing a more uniform NiO dispersion on SiO 2 , which was confirmed by BET, XRD, and TEM analyses. The results of H 2 -TPR, H 2 -TPD, NH 3 -TPD, and Py-IR analyses suggested that the addition of citric acid augmented the interaction between phosphotungstic acid (HPW), Ni species, and SiO 2 . Citric acid improved Ni species and HPW dispersion, fostering increased HPW-Ni species formation. This, in turn, generated additional electron-deficient Ni ions , stemming from semi-reduced HPW-Ni species, which acted as Lewis acid sites, enhancing Ni + species effectiveness in activating aromatic rings. The better-dispersed, non-HPW-bound NiO, which, upon complete reduction to Ni, led to a substantial rise in H 2 bond cleavage, thereby facilitating more hydrogen spillover. Overall, the infusion of citric acid into fabricating Ni-HPW/SiO 2 catalysts sparked a significant surge in their aromatic hydrogenation ability.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Xiaolong Shi,Yuncai Song,Yewen Wang,Jie Feng,Wen-Ying Li
The separation of high-purity aromatic monomers from direct coal liquefaction (DCL) contributes to their value-added utilization. However, the complexity of its components often leads to additional reactions. To achieve efficient separation of monocyclic aromatics from DCL, this paper proposes a separation strategy of ‘fractionation − column chromatography − extractive distillation’ through precise regulation of weak intermolecular interaction forces. The results showed that monocyclic aromatics are enriched up to 19.12 wt% through fractionation, followed by the separation of mixed aromatics via atmospheric pressure column chromatography. Finally, o-xylene with a purity of 99.16 wt% was separated by extractive distillation using sulfolane as the solvent. The separation mechanisms are investigated through quantum chemical calculations and UV–vis analysis. Results indicated that the polarity difference was the driving force for separating mixed aromatics. The interaction between the solvent and the C8 aromatics in the extractive distillation was primarily governed by Van der Waals forces. The difference in interaction energy, ranging from 2.22 to 6.53 kJ/mol, serves as the driving force for the separation of o-xylene. The separation strategy proposed in this study provides a new perspective for the separation of high-purity aromatic monomers from DCL.
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Food & Function
·
2020
·Vol. 12
·期 4
·1626-1638
·
IF 4.171
Xu-Hui Huang,Yu-Ying Zhang,Ming Zhu,Da-Yong Zhou,Ming Du,Bei-Wei Zhu,Xiu-Ping Dong,Ian Fisk,Lei Qin
Clam is a kind of nutritious, delicious and economical aquatic food around the world and is famous for its unique aroma. Instrumental analysis, sensory analysis, and comprehensive statistical analysis were performed to explain the relationship between aroma and odorants in clam soup. Six extraction methods combined with GC-MS and sniffing were utilized to obtain the aroma fingerprints of clam soup and to analyze the correlation with aroma perception. Solvent extraction methods were more effective than headspace extraction methods for the volatiles of clam soup. SAFE was the best method to obtain the most comprehensive information of volatiles of clam soup. The sequence of a combination of different extraction methods and SAFE would also affect the results of volatiles extracted from clam soup. Volatiles extracted via SDE, P&T, and SPME would add further information to the result of SAFE. A total of 119 volatile compounds were identified from clam soup by summarising the results of different extraction methods. The significant effect of 14 key odorants in clam soup on aroma perception was verified by aroma recombination and odorant omission tests. A neural network diagram of the aroma profile was designed to visualize the information of odor perception. Furthermore, the results would be beneficial for aroma research studies of aquatic food and the processing of clam products.
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DALTON TRANSACTIONS
·
2020
·Vol. 50
·期 2
·715-721
·
IF 4.174
Jianhui Xie,Bing Li,Huijing Liu,Yijun Li,Jian-Bo He,Yanzhen Zheng,Kai-Chung Lau,Tai-Chu Lau
Ferrate(VI), [FeO4]2−, is a very powerful oxidant that can oxidize a wide variety of inorganic and organic compounds. However, the mechanisms of many of these oxidation reactions have not been studied in detail. In this work, we have investigated the kinetics and mechanism of the oxidation of 4-alkylbenzenesulfonates by ferrate in aqueous solutions at pH 7.45–9.63 by UV/Vis spectrophotometry. The reactions are first order with respect to both [ferrate] and [4-alkylbenzenesulfonate]. The second-order rate constants for the oxidation of 4-isopropylbenzenesulfonate by ferrate at 25 °C and I = 0.3 M are found to be (5.86 ± 0.08) × 10−1 M−1 s−1 and (4.11 ± 1.50) × 10−3 M−1 s−1 for [Fe(O)3(OH)]− and [FeO4]2−, respectively, indicating that [Fe(O)3(OH)]− is two orders of magnitude more reactive than [FeO4]2− and is the predominant oxidant in neutral and slightly alkaline solutions. This is further supported by the effect of the ionic strength on the rate constant. No solvent kinetic isotope effect (KIE) was found but a moderate primary KIE = 1.6 ± 0.1 was observed in the oxidation of 4-ethylbenzenesulfonate and 4-ethylbenzenesulfonate-d9. Alkyl radicals were trapped by CBrCl3 in the oxidation of alkylarenes by ferrate. Combined with DFT calculations, a hydrogen atom transfer (HAT) mechanism was proposed for the reactions between [Fe(O)3(OH)]− and 4-alkylbenzenesulfonates.
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JOURNAL OF CHROMATOGRAPHY A
·
2025
·
IF 4
Jinhua Xu,Minghui Tang,Jinyu Zhang,Wenmin Zhang,Shiye Xie,Lan Zhang
This study reports the synthesis and application of a flower-like chiral metal-organic framework (CMOF) based on copper ions and tryptophan (Cu(Trp)-CMOF). The Cu(Trp)-CMOF was successfully synthesized at room temperature through a facile method with hexadecyl trimethyl ammonium bromide (CTAB) as a structure-directing agent. The material exhibits a flower-like morphology with hierarchical porosity and well-defined crystallinity in the monoclinic P2 1 /c space group. Comprehensive characterization revealed that different optical configurations ((R)-type, (S)-type, and (RS)-type) could be selectively obtained by controlling the chirality of tryptophan ligands. The synthesized CMOFs demonstrated excellent performance in two key applications: colorimetric recognition of amino acid enantiomers and separation of volatile organic compounds (VOCs). When used as a chromatographic stationary phase, the CMOF significantly enhanced the separation of challenging structural isomers, particularly improving the resolution (R S ) of xylene isomers (R S from 1.03 to 2.62) and ethyltoluene isomers (R S from 4.83 to 9.23) compared to conventional columns. This work provides new insights into the design and application of CMOFs for chiral separation and recognition.
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GREEN CHEMISTRY
·
2025
·Vol. 27
·期 26
·7908-7917
·
IF 9.2
Shuying Tian,Jing Dai,Zhengjian Li,Qiqi Wu,Guangxu Chen
Against global resource scarcity and environmental crises, recycling large quantities of discarded polyolefin waste presents an urgent challenge for humanity. However, the thermal degradation of polyolefins, which typically requires high temperatures to cleave the carbon–carbon (C–C) bonds, has been hindered by energy limitations. We present a simple approach that uses inexpensive AlCl3 and dichloromethane to convert polystyrene into aromatics at 40 °C within 3 hours, achieving a polystyrene conversion of over 70 wt%. The Lewis acid catalysts interact with benzene under acidic conditions, promoting the elimination of the C–C backbone to generate carbocations, which subsequently undergo β-scission. The dissolution of polystyrene in dichloromethane increases the reaction interface, thereby enhancing the reaction rate. This study provides a cost-effective approach for the high-value utilization of aromatic rings in polystyrene.
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