FUEL
·
2022
·
IF 8.035
Yongtao Zhang,Fulin Chen,Yan He,Fei Wang
CO 2 sequestration based on hydrate technology is considered to be the most promising long-term CO 2 sequestration technology. In this study, a method of using initial stirring to activate CO 2 hydrate formation process was proposed in the aim of saving energy and avoiding the problem of stirring shaft stuck, where the stirring only played a role in activating hydrate formation process. Two amino acids, l -Methionine and d -leucine, were chosen as promoters for improving the formation kinetics of CO 2 hydrates, and l -Methionine presents better than d -leucine. When the concentration of l -methionine solution is equal to or greater than 4 mmol/L, even with the initial stirring of 10 rpm within 8 min, T 90 can be shortened to close to or less than 40 min with a high gas consumption of more than 7.3 mmol gas/mL water, where the promoting effect is similar to the condition of continuous stirring of about 100 min, indicating that about 90 % of the energy consumed for mechanical stirring can be saved. Moreover, an interesting phenomenon was observed that CO 2 hydrates firstly nucleated inside the l -methionine solution, and a large number of small hydrate floccules rapidly formed and filled the entire solution under the action of magnetic stirring, which proved the instantaneous excitation effect of stirring on hydrate formation. This work contributes to rethinking the promoting roles of stirring and promoters in CO 2 hydrate formation.
研究领域:
环境科学
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能源化学
·
物理化学
·
气体水合物
·
碳捕集与封存
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Hui Liu,Huiting Xu,Zhaofeng Song,Zhengwen Li,Saiwei Zhang,Yili Zhang,Jixiang Wang,Xiaoyong Qian
The types and concentrations of L- and D-type amino acids (AAs) produced by sludge hydrolysis increased with increasing pH of alkali treatment, with the highest content of cysteine and a higher degree of racemization of threonine, cysteine, and alanine. There was a strong correlation between methane production and the following AAs (D-leucine, D-aspartic acid, L-threonine, and L-cysteine). The addition of representative AAs (L-cysteine and D-cysteine) increased cumulative methane production, and L-type promoted better than D-type, with the highest cumulative methane production 906.3 mL/g-VS with the addition of 50 mg/L of L-cysteine, which was 1.20 times that of the CK group (digestion time 21 d); while the methane production with the addition of 200 mg/L of L-cysteine would be inhibited. The L-type AAs promoted better than the D-type in the solubilization, hydrolysis, acidification, and hydrogen-consumption methanogenesis stages, whereas the homoacetogenesis process and acetate-consumption methanogenesis stages did not play a significant role. The dominant genera of bacteria at the genus level belonged to unclassified_c_Acitinobacteria, unclassified_p_Chloroflexi, unclassified_c_Acidimicrobiia and Mycobacterium, while Methanothrix and Methanobacterium were the dominant archaea in the digesters. The top 4 metabolic functions were biosynthesis of secondary metabolites, microbial metabolism in diverse environments, biosynthesis of AAs and carbon metabolism. Metagenome results showed that, with L-cysteine addition, enriching Methanothrix and Methanobacterium showed enhanced contribution to the main pathways, especially the biosynthesis of secondary metabolites and carbon metabolism.
研究领域:
环境科学
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微生物学
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生物化学
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高影响因子
CHIRALITY
·
2024
·Vol. 36
·期 4
·e23665
·
IF 2.8
Luzheng Dong,Jun Wu,Xiashi Zhu
In this paper, the amino acid chiral ionic liquid (AACIL) was prepared with L-phenylalanine and imidazole. It was characterized by CD, FT-IR, 1 H NMR, and 13 C NMR spectrum. The chiral recognition sensor was constructed with AACIL and Cu(II), which exhibited different chiral visual responses (solubility or color difference) to the enantiomers of glutamine (Gln) and phenylalanine (Phe). The effects of solvent, pH, time, temperature, metal ions, and other amino acids on visual chiral recognition were optimized. The minimum concentrations of Gln and Phe for visual chiral recognition were 0.20 mg/ml and 0.28 mg/ml, respectively. The mechanism of chiral recognition was investigated by FT-IR, TEM, SEM, TG, XPS, and CD. The location of the host-guest inclusion or molecular placement has been conformationally searched based on Gaussian 09 software.
研究领域:
化学
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分析化学
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材料科学
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DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Lilan Tan,Wenrong Cai,Fangqin Wang,Junyao Li,Datong Wu,Yong Kong
Electrochemiluminescence (ECL), integrating the characteristics of electrochemistry and fluorescence, has the advantages of high sensitivity and low background. However, only a few studies have been reported for enantioselective sensing based on the ECL-active platform because of the huge challenges in constructing tunable chiral ECL luminophores. Here, we developed a facile strategy to design and prepare ECL-active chiral covalent organic frameworks (COFs) Ph-triPy+-(R)-Ru(II) for enantioselective sensing. In such an artificial structure, the ionic skeleton of COFs was beneficial to the electron transfer on the working electrode surface and the chiral Ru-ligand was used as the chiral ECL-active luminophore. It was found that Ph-triPy+-(R)-Ru(II) coupled with sodium persulfate (Na2S2O8) as the coreactant exhibited obvious ECL signals. More importantly, a clear difference toward l- and d-enantiomers was observed in the response of the ECL intensity, resulting in a uniform recognition law. That is, for amino alcohols, d-enantiomers (1 mM) measured by Ph-triPy+-(R)-Ru(II) showed a higher ECL intensity compared with l-enantiomers. Differently, amino acids (1 mM) gave an inverse recognition phenomenon. The ECL intensity ratios between l- and d-enantiomers (1 mM) are in the range of 1.25–1.94 for serine, aspartic acid, glutamic acid, valine, leucine, leucinol, and valinol. What is more interesting is that the ECL intensity was closely related to the concentration of l-amino alcohols and d-amino acids, whereas their inverse configurations remained unchanged. In a word, the present concept demonstrates a feasible direction toward chiral ECL-active COFs and their potential for efficient enantioselective sensing.
研究领域:
材料科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE INDIAN CHEMICAL SOCIETY
·
2024
·
IF 3.2
Chong Liu,Xiaoxue Han,Qing Zhang,Zhuojia Shi,Yuqing Zhang,Yu Chen
Low-melting mixture solvents (LoMMSs) and ionic liquids (ILs) are regarded as green solvents for the recovery of lithium-ion batteries (LIBs) cathode with high sustainability. Unexpectedly, we find for the first time that the release of LoMMSs- or ILs-based carbon materials and LIBs recycling leachate into water can lead to significant pollution from dissolved organic matter (DOM). Moreover, COD, NH 4 –N and total P concentration in river from Jingjinji Region is relatively high due to the high concentration of DOM. This work would provide us a hint that the application of so-called green LoMMSs and ILs in materials preparation and LIBs recovery should be treated with high caution in order to minimize DOM pollution for the rivers in Jingjinji Region.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2026
·
IF 5.8
Xiang-Dong Xie,Biao Hu,Zhi-Sen Tan,Chuan Wang,Hao Li,Qin-Hao Zhang,Hui-Song Hu,Pan Liu,Lu Ren,Xin-Kun Suo,Fa-He Cao
D-leucine-modified Zr-V coating suppresses localized corrosion of ADC12. • D-leucine seals defects and limits H 2 O/Cl – transport in the coating. • SECM reveals reduced oxygen-consuming local corrosion reactions. • DFT confirmed strong D-leucine adsorption and Zr–O interfacial anchoring on ZrO 2 . ADC12 aluminum (Al) alloy is prone to localized corrosion because its heterogeneous surface microstructure and unstable native oxide film induce spatially non-uniform electrochemical reactions at the alloy/electrolyte interface. Herein, a green D-leucine-assisted zirconium-vanadium conversion coating was fabricated on ADC12 Al alloy via a simple chemical immersion process to regulate coating formation and interfacial electrochemical corrosion behavior. D-leucine acted as a bio-derived interfacial modifier to regulate the deposition, defect evolution and interfacial bonding of Zr-containing oxide/hydroxide species. Surface analyses confirmed the incorporation of D-leucine into the conversion layer and its chemical interaction with Zr-containing species mainly through carboxyl groups, thereby promoting organic-inorganic coupling, defect sealing and coating compactification. The optimized ZRCC+0.5D-AA coating exhibited a low corrosion current density of 4.71×10 −8 A·cm −2 and a corrosion rate of 5.17×10 −4 mm·y −1 , approximately 195 times lower than those of the untreated ADC12 substrate. Scanning electrochemical microscopy further confirmed that D-leucine modification effectively suppressed localized oxygen-consuming corrosion reactions and reduced electrochemical heterogeneity on the coated surface. No visible corrosion was observed after 96 h neutral salt spray exposure. DFT calculations revealed strong dissociative adsorption of D-leucine on monoclinic ZrO 2 (−111), with the vertical bidentate configuration showing a dissociative adsorption reaction energy of −9.88 eV and pronounced interfacial charge redistribution. These results demonstrate that D-leucine-assisted interfacial modification simultaneously regulates coating defects, interfacial anchoring, and local electrochemical activity, providing an effective chromium-free surface finishing and protection strategy for Al alloys. Download: Download high-res image (411KB) Download: Download full-size image D-leucine-assisted interfacial modification suppresses localized electrochemical corrosion of zirconium–vanadium conversion coatings on ADC12 aluminum alloy. D-leucine coordinates with Zr-containing species to form a compact organic–inorganic hybrid interface, sealing defect-assisted pathways and reducing H 2 O/Cl⁻ ingress. This limits mass transfer, charge-transfer reactions, cathodic oxygen reduction, and anodic Al dissolution at the coating/substrate interface. DFT and SECM results reveal strong interfacial anchoring and reduced oxygen-consuming local corrosion activity, leading to optimal long-term protection for the coating containing 0.5 g/L D-leucine.
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高影响因子
ANALYTICAL CHEMISTRY
·
2026
·
IF 7.3
Simin Zhang,Xiangfeng Chen,Yaping Shi,Xiangyu Zhu,Zongwei Cai
As bioactive compounds, chiral amino acids (AAs) have been demonstrated to play pivotal roles in different physiological processes, thereby influencing human health. The assessment of the relative enantiomeric ratio through analytical methods is essential for indicating the abnormal status of disease progression, which drives the development of effective methods for resolving and identifying enantiomers. This work presents a robust strategy for the ultrahigh-resolution analysis of chiral AAs using MALDI-TIMS-MS. By employing a chiral derivatization process using S-NIFE and stabilizing the soft chain of the derivatization reagent with bimetal ion addition, the separation of 19 pairs of proteinogenic AAs was successfully achieved. This method not only demonstrates outstanding separation capability but also proves its efficiency in determining enantiomeric ratios, extending its applicability to real sample analysis.
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DOI
PubMed
高影响因子
Cell Reports Physical Science
·
2026
·
IF 6.9
Qi Yi,Yi-Qi Sheng,Dong-Qi Han,Xue-Wei Lin,Chi-Kit Siu,Zhong-Ping Yao
Chiral recognition in mass spectrometry typically relies on one chiral selector (CS) to distinguish enantiomers through dissociation of diastereomeric complexes. Here, we report an innovative approach employing two different CSs to form trimeric complexes with analytes in the presence of Cu 2+ . Nineteen proteinogenic chiral amino acids are investigated as both analytes and selectors, and complexes involving proline and aromatic amino acids exhibit superior chiral discrimination. Notably, the two selectors can play distinct roles: one plays an anchoring role, while the other only contributes to the degree of discrimination. Computational modeling reveals that the copper-bound trimers (e.g., [Cu II (Pro)(Phe)(Tyr) − H] + ) adopt a pentacoordinated geometry with a square-planar base and an elongated axial bond. Three energetically similar precursor structures co-exist, with dissociation occurring exclusively at the axial position. The strong agreement between experimental and computational results validates this binary CS concept and provides a framework for designing advanced CSs for unknown samples.
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高影响因子
Polymers
·
2020
·Vol. 12
·期 9
·2053
·
IF 3.426
Chen Qi,Wenke Yang,Fuyan He,Jinshui Yao
Eight kinds of chiral diacid monomers were prepared with amino acids with different side groups or configurations. Polyester-imides (PEIs) were synthesized from these diacid monomers and diphenol monomers through polycondensation reaction, and the performances and properties were compared with the chiral polyamide-imides (PAIs) previously synthesized by our work group. Their thermal properties were analyzed by thermo gravimetric analysis (TGA) and dynamic thermomechanical analysis (DMA), and it was found that the glass transition temperature (Tg) of PEI was mainly affected by the volume of side groups. Their degradability was studied through buffer degradation experiments, and the changes in their water contact angle, molecular weight, structure and appearance during the degradation process were characterized by contact angle tester, gel permeation chromatography (GPC), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). With degradation, the hydrophilicity of PEI was improved, and when amino acids with larger side groups or D configuration were introduced into the backbone of PEI, the degradability decreased.Keywords:chiral amino acids;polyester-imides (PEIs);degradation;thermal property
研究领域:
材料科学
·
生物医学工程
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DOI
PubMed
高影响因子
Food Bioscience
·
2026
·
IF 6.2
Mengmeng Ji,Jinwei Li,Liuping Fan,Liang Wang,Shengquan Huang
Pseudomonas aeruginosa , a significant opportunistic pathogen, poses a serious threat to food safety due to its antibiotic resistance and strong biofilm-forming ability. In this study, quercetagetin (Que) was identified as a novel quorum sensing (QS) inhibitor. Reporter strain assays, molecular docking, and dynamic simulation indicated that Que acts as an antagonist of the QS receptors. Que attenuated QS-regulated virulence phenotypes in a dose-dependent manner but showed insufficient antibiofilm activity ( p >0.05) at sub-minimum inhibitory concentration (sub-MIC) levels. In contrast, the combination of 0.5 mmol/L Que with 20 mmol/L D-leucine or D-tryptophan exhibited additive effects on planktonic cells, reducing its survival by 2.19–3.97 log compared to the control. For biofilm cells, the combined treatment potentiated the reduction in cell density by 0.48–1.42 log. Notably, these effects were strain-dependent but were equal to or outperformed those of the ε-polylysine (ε-PL) control. Mechanistically, this enhancement was driven by the disruption of biofilm matrix and cell membrane integrity. This was evidenced by the greater suppression of Acyl-homoserine lactones (AHLs) synthesis and virulence phenotypes, alongside substantial reductions in biofilm biomass and roughness and increased in membrane permeability compared to Que. Furthermore, the combination resulted in repression of key enzymes activities (Na + -K + -ATPase and succinate dehydrogenase) by 29%–38%. These changes indicated a promising strategy to control P. aeruginosa and enhance food safety.
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高影响因子
Analytical Methods
·
2024
·Vol. 16
·期 6
·939-949
·
IF 2.7
Qian Du,Xiaoyu Zhao,Xiping Mei,Yaqin Zhao,Chuan Dong,Junfen Li
To develop a feasible, sensitive, and essential sensor is important for the identification of Fe3+ ions and ascorbic acid (AA). Herein, highly fluorescent heteroatom co-doped carbon dots (N,S-CDs) with a quantum yield (QY) of 24.6% were synthesized, using hydrothermal treatment of L-cysteine (Cys) and 1-amino-2-naphthol-4-sulfonic acid (ANSA). The fluorescence emission of the as-prepared N,S-CDs was quenched strongly by Fe3+ ions, and this was further recovered by the reduction effect of AA on Fe3+. Based on this, continuous fluorescence sensing of Fe3+ and AA with an “on-off-on” style was developed. The detection of Fe3+ and AA were in relatively wider linear ranges of 5.00–105 μmol L−1 and 4.97–54.8 μmol L−1, with a detection limit of 0.10 μmol L−1 and 2.4 nmol L−1 (S/N = 3), respectively. Then, the N,S-CDs were successfully used to measure Fe3+ ions and AA in some daily food samples, and this method exhibited some advantages over most other reported techniques in the term of response speed, quantum yield, and detection limit.
研究领域:
分析化学
·
食品科学
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产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2014
·
IF 5.825
Xuan Kuang,Yu Ma,Hao Su,Jine Zhang,Yu-Bin Dong,Bo Tang
Homochiral metal–organic frameworks with fine-tuned pore sizes/walls and large surface areas are promising porous materials for enantioseparation considering the traditional zeolite molecular sieves have no chirality. Using enantiopure pyridyl-functionalized salen [(N-(4-Pyridylmethyl)-l-leucine·HBr)] as a starting material, we have prepared a noninterpenetrated three-dimensional homochiral metal organic framework {[ZnLBr]·H2O}n, which was further used as a chiral stationary phase for high-performance liquid chromatography to enantioseparate racemic drugs, showing excellent performances in enantioseparation of drugs. The metal–organic framework can be regarded as a novel molecular sieve-like material with a chiral separation function based on the relative sizes of the chiral channels and the resolved molecules.
研究领域:
化学
·
材料科学
·
药学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）