FOOD CHEMISTRY
·
2025
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IF 9.8
Yao Li,Jiyuan Tu,Hong Wang,Kexin Luo,Pingping Xiao,Tangbin Liao,Guo-Jun Zhang,Zhongyue Sun
Acetamiprid (ACE) is used in plant cultivation and their accumulation is a threat to ecology and health. Herein, a fluorescence/ion current dual-readout nanopore biosensor was designed for ACE detection. The carboxyfluorescein (FAM) labeled ACE aptamer was hybridized with complementary DNA (cDNA) to form partially hybridized double stranded DNA (dsDNA), and modified on the nanopore surface. ACE could specifically interact with FAM-aptamer and compete it against the nanopore surface. The probe changed from dsDNA to single-stranded DNA (ssDNA), which triggering the ionic current signal switched from “closed” to “open” and the fluorescence signal changed from “on” to “off”. The sensor exhibited linear range 0.5–100 ng/mL and with detection limit of 0.12 ng/mL. Meanwhile, the sensor can be employed for the detection of ACE residues in medicine and food homology (MFH) products. More importantly, the dual signal output detection results can be cross-verified, ensuring the accuracy of the detection.
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PubMed
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Food Bioscience
·
2024
·
IF 4.8
Na Yang,Zitao Zheng,Yamei Jin,Lingtao Zhang,Bimal Chitrakar,Xueming Xu
A continuant-flow induced electric field (IEF) apparatus was presented for the treatment of the milk. The electric field originated from the magnetic energy, and the volumetric heating of the milk was observed. The inactivation effect of IEF treatment on the milk inoculated with exogenous bacteria was investigated under different IEF strengths (11.11, 14.81 and 18.52 V/cm) and the duration (98, 131 and 196 s), IEF treatment reduced E. coli and S. aureus by more than 5.9 Log CFU/mL, and the damage to cell membrane caused by the non-thermal effects was observed via SEM images. Under 14.81 V/cm for 196 s, the total number of colonies in raw milk was reduced by 4.58 Log CFU/mL. The results demonstrated IEF treatment effectively preserved nutritional properties of milk, with no significant influence on protein content. Furthermore, IEF-treated milk exhibited smaller color changes, compared to conventional heat (CH) treatments, while the process did not lead to the accumulation of casein and milk fat globules. Because of rapid temperature rise and electroporation effect on microorganisms, it suggests that IEF treatment has the potential to dairy processing.
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CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Zhongwei Wang,Yan Qing,Zhu Liu,Shasha Wang,Yiqiang Wu,Shoulu Yang
In this work, we developed a new methodology for generating hybrid wood materials through the in-situ hybridization of phosphotungstic acid (HPW) and organic amines at ambient temperature. By selecting specific molecules of organic amines, this innovative process produces rod-like (imidazole) and spherical (triethylamine) amphiphilic organic-PW nanoparticles (NPs) with tunable particle sizes. The in-situ synthesis of organic-PW NPs within the wood was verified by series of methods for analysis. The resulting wood samples exhibited remarkable flame retardancy and smoke suppression, as demonstrated by successful fulfilment of the UL-94 test, a remarkable 60.1 % reduction in total smoke production, with a weight percent gain of only 7.5 %. Distinct profiles of the pyrolysis products were observed in the organic amine-PW-treated samples compared to pure wood, indicating a shift in the depolymerization pathway from levoglucosenone (LGO) to hydroxymethylfurfural (HMF) in the presence of acid catalyst. Notably, the thermal protection properties of imidazole-PW are higher than those of triethylamine-PW, attributed to the greater stability of cyclic phosphoric acid-imidazole complexes compared to linear phosphoric acid-triethylamine complexes. Our study not only presents an innovative approach to fabricate hybrid wood materials but also demonstrates exceptional flame-retardant and smoke-suppression capabilities, and altered pyrolysis pathways and evaluated intermediate products stability.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
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IF 4.3
Zhendong Fu,TongJia Zhang,Cong Chen,Xiaoyu Wang,Liping Wang
Nanozymes are nanoparticles with enzymatic activity, which are widely used in environmental and antibacterial research. Herein, we designed and synthesized novel amorphous nanozyme Cu-Im NPs with multiple enzyme-mimicking activities. Cu-Im NPs have the same active sites as natural laccase. In addition, the active center is similar to that of carbonic hydrolase, replacing the zinc ions with copper ions. Meanwhile, Cu-Im NPs also possess peroxidase-like activity. We reveal the multi-enzyme catalytic mechanisms of Cu-Im NPs. Notably, phosphate inhibits the laccase-like and peroxidase-like activities of Cu-Im NPs while activating their hydrolase activity. Based on these findings, we have developed a sensitive and selective method for detecting phosphate anions.
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PubMed
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jiayan Zhu,Lin Zhang,Zongjian Liu,Wenxia Zhai,Zhengfei Ma,Qun Cui,Haiyan Wang
The separation of mono- and di-branched C6 alkane isomers is one of the most challenging industrial processes for the production of high-octane gasoline components. In this work, ZIF-8 with dual ligands of imidazole (IM) and 2-methylimidazole (2-MIM), named as DLA-ZIF-8-IM, was synthesized by the method of delayed linker addition, and the microstructure of DLA-ZIF-8-IM was analyzed. Adsorption thermodynamic, kinetic and separation properties of C6 alkane isomers were investigated. The results show that compared with SALE-ZIF-8-IM prepared by the solvent-assisted ligand exchange method, the synthesis method of DLA-ZIF-8-IM is simpler and the BET specific surface area and pore volume (2136 m 2 ·g −1 and 0.72 cm 3 ·g −1 ) of DLA-ZIF-8-IM are increased by 21 % and 14 %, which is more conducive to adsorption and diffusion of 3-methylpentane (3MP) on DLA-ZIF-8-IM. The equilibrium adsorption capacity of 3MP on DLA-ZIF-8-IM reaches up to 2.89 mmol·g −1 , which is 1.1 times than that on SALE-ZIF-8-IM, and the ratio of diffusion time constants between 3MP and 2,3-dimethylbutane (23DMB) on DLA-ZIF-8-IM (5.13) is 2.2 times than that on SALE-ZIF-8-IM. Moreover, at 30℃, the breakthrough adsorption capacity of 3MP on DLA-ZIF-8-IM is 1.46 mmol·g −1 , which is 1.6 times more than that of SALE-ZIF-8-IM (0.90 mmol·g −1 ), while the breakthrough adsorption capacity of 23DMB is basically the same. The separation factor between 3MP and 23DMB on DLA-ZIF-8-IM is 2.96 via the synergy of thermodynamic and kinetic mechanism and the dynamic adsorption capacity of 3MP reaches 1.46 mmol·g −1 . DLA-ZIF-8-IM achieves complete separation of C6 alkane mixtures for obtaining single high-purity product. This work provides a novel synthesis strategy for developing C6 alkane (clear) adsorption separation materials by modulating microporous structures of dual-ligand MOFs.
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Polymer-Plastics Technology and Materials
·
2024
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IF 2.6
Shuai Qi,Shiwei Xie,Bo Li,Chang Liu,Sai Gong,Xiao Zhang,Shenzhen Li
Traditional epoxy resins are of technological significance for structural adhesives and composite materials, as well as many others. However, brittleness limits its further development, and achieving a combination of toughness and rigidity in epoxy networks remains a great challenge. In this work, we designed and synthesized low-temperature curable, tough and repairable epoxy networks via hindered urea bond (HUB) crosslinking strategies. Mechanical testing revealed that the material exhibited simultaneously improved toughness and stiffness, and specifically, tensile strength, elongation at break, and toughness were able to reach 78.2 MPa, 8.61%, and 4.63 MJ · m−3, respectively. More importantly, the dynamic exchange of HUB dispersed between polymer chains enables HUB crosslinked epoxy with thermal-triggered reparability and recyclability. In addition, thermal properties, chemical stability and water resistance of toughened epoxy samples were also characterized. This work provides a practical guidance for the exploration of high-performance epoxy with the potential to be extended to other polymers.
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RSC Advances
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2017
·Vol. 7
·期 83
·52712-52718
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IF 3.108
Xiu-zhong Zhu,Xiao-dong Fan,Na Zhao,Xin Min,Jie Liu,Zi-chao Wang
In order to study the influence of steric structural factors of mono-lithium based anionic initiators on the 1,4 unit content of hydroxyl terminated polybutadiene (HTPB), a series of precursors with different steric volumes were designed and synthesized. The precursors were allowed to react with lithium in cyclohexane at 60 °C to prepare mono-lithium based initiators. The degree of lithium reaction in initiators was characterized by an indirect method in which a certain amount of highly reactive methanol was added into the mono-lithium based initiator solution, and then the highly reactive initiator was replaced by a hydrocarbon molecule to monitor the reaction process using NMR. By using the initiators prepared, HTPB was synthesized via anionic polymerization of 1,3-butadiene in cyclohexane. The structure and 1,4 unit content were characterized by SEC-MALLS and 1H NMR. It was found that the content of the 1,4 unit in HTPB was markedly increased with an increase in the initiator's steric volume. It was also found that much higher relative 1,4 unit content in HTPB was achieved when using an initiator with a higher steric volume, compared to the initiators with lower steric volume. In addition, both 1,4 unit content and molecular weight, as well as the molecular weight distribution of HTPB, can be coordinately controlled by the steric structure of the initiators during anionic polymerization.
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ANALYTICAL LETTERS
·
2017
·
IF 1.15
Xiuping He,Jiangtao Wang,Xiaoqi Mei
A multitemplate molecularly imprinted polymer was synthesized using fragments similar to gonyautoxins 1 and 4 including 2,4,6-triaminopyrimidine, 4-hydroxy-2-butanone, and imidazole as dummy templates by bulk polymerization. Scanning electron microscopy and infrared spectroscopy showed a porous structure and the formation of organic groups in the imprinting process of the polymer. One millilitre of 0.1 mol L−1 acetic acid and 1 mL of 95% methanol were the optimized washing and eluting solutions during the molecularly imprinted solid-phase extraction. The adsorption capacity of the multitemplate molecularly imprinted polymer was lower than for the monotemplate molecularly imprinted polymer prepared in a previous study in seawater in which Alexandrium tamarense and Alexandrium minutum were cultivated. This result may due to the inappropriate combination of the dummy template fragments in the synthesis resulting in the unfitness of the imprinting sites for gonyautoxins 1 and 4. In general, it is inappropriate to use fragments with the similar parts to the analyte as the dummy templates. However, this work indicated the optimal molecularly imprinted polymer for the selective extraction of gonyautoxins 1 and 4.
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Journal of CO2 Utilization
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2017
·
IF 4.292
Yingjie Xu
Recently, chemical fixation of CO 2 catalyzed by protic ionic liquids (PILs) has been successfully achieved, suggesting that CO 2 absorption behavior plays an important role on CO 2 activation and transformation. For this reason, the influence of the alkalinity and physicochemical properties on CO 2 absorption behavior of four azole-based PILs, namely [DBNH][Pyr], [DBNH][Im], [DBUH][Pyr], and [DBUH][Im] was discussed in this work. The alkalinity of PILs was determined by potentiometric titration, and free space of PILs was evaluated by thermal expansion coefficient and refractive index. Solubility parameter of PILs was obtained from the activation energy for viscous flow. The results show that PILs with [Pyr] − exhibits stronger alkalinity and larger free space, which can help to improve CO 2 capture capacity. Whereas PILs with larger cation size [DBUH] + exerts higher viscosity, resulting in slower absorption rate of CO 2 . Furthermore, the CO 2 absorption capacity is inversely proportional to the solubility parameter of PILs. The absorption mechanism proved by FT-IR and 13 C NMR spectra indicates that [Pyr] − or [Im] − can react with CO 2 to form carbamate. Accordingly, considering the CO 2 capture capacity and absorption rate, [DBNH][Pyr] may be a good candidate for efficient CO 2 capture and activation with low enthalpy of absorption of −38.2 kJ mol −1 .
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2017
·
IF 3.582
Tianyu Fan,Fengxiang Yin,Hao Wang,Xiaobo He,Guoru Li
A Co-OBA/C (OBA = 4,4′-Oxybis (benzoic acid)) composite catalyst was synthesized by integrating MOF (Co-OBA) with black carbon through a hydrothermal process. The catalyst was characterized using X-ray powder diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy and X-ray photoelectron spectroscopy. The catalytic activities toward the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) were evaluated by linear-sweep voltammetry (LSV) in an alkaline electrolyte . The ligand mode of the carboxylate binding is chelating coordination and the ligand mode of imidazole is monodentate ligand in the Co-OBA/C catalyst. The Co-OBA/C catalyst shows much better ORR, OER and bifunctional activities than the Co-OBA + C catalyst due to the synergistic effect between Co-OBA and carbon black in the Co-OBA/C catalyst.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Wenhui Li,Yuqiu Wu,Si Long,Zhi Chen,Liangzhi Li,Xin Ju
The cascade of sugar isomerases is one of the most practical methods for producing rare sugars, and enzyme immobilization endows it with high economic efficiency, operational convenience and reusability. However, the most employed cross-linker glutaraldehyde (GA) has the disadvantages of enzyme deactivation and limitation of substrate binding. Herein, three compounds, glyoxal, GA, and 2,5-furandicarboxaldehyde (DFF) were evaluated within a previously developed cascade comprising ribose-5-phosphate isomerase and D-tagatose-3-epimerase to prepare D-ribulose form D-xylose. Analyses of surface morphology, element and chemical bond revealed that all compounds effectively cross-linked the isomerases. High concentration of the cross-linkers was generally beneficial for binding protein and preventing enzyme leak during reusing cycles. Glyoxal performed the highest immobilization rate, though it hadn't been employed as a cross-linker for enzyme immobilization. DFF mediated cross-linking revealed the highest activity recovery, substrate conversion and residual activity after reusing cycles, suggesting better biocompatibility than glyoxal and GA. After 8 rounds of recycling, the residual activity of enzyme immobilized by DFF was 61.4 %, ∼30 % higher than that of GA. This study proved a potential alternative cross-linker DFF for the immobilization of enzyme cascade with high activity recovery and reusability, which could promote the efficient production of high value-added products from biomass monosaccharides.
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ENERGY & FUELS
·
2024
·
IF 5.2
Yitai Wang,Yinge Bai,Fukang Song,Shaojuan Zeng,Lulu Wang,Xiangping Zhang
Ionic liquids (ILs)-based solvent absorption is a promising green and low regenerative energy consumption technology for CO2 capture. Various functionalized ILs with highly efficient performance have been developed in academia, and the research focuses on thermodynamic properties such as CO2 solubility, gas–liquid equilibrium, and reaction heat. Kinetic studies of CO2 in ILs are also important to evaluate their potential for industrial applications, which need to be studied further. In this work, the mass transfer characteristics of three azole-based IL anhydrous solvents were studied in a wetted-wall column (WWC). At 313.15 K, the total mass transfer coefficient (KG) of fresh [HDBU][Im]/EG, [Cho][Im]/EG, and [Cho][Triz]/EG was 5.40, 2.32, and 0.80 mmol/(m2·s·kPa), respectively. The KG of the three solvents increased along with increase in the temperature. Conversely, when the CO2 loading in the solvent increased, KG decreased. At the initial stage of absorption, the mass transfer resistance of [HDBU][Im]/EG was mainly in the gas phase and then gradually changed to liquid phase. However, due to the excessive viscosity of [Cho][Im]/EG and [Cho][Triz]/EG, the mass transfer resistance was mainly concentrated in the liquid phase. The enhancement factor (E) of [HDBU][Im]/EG was higher than 159, indicating that it had good chemical reaction ability, thereby improving the mass transfer ability. The KG of [HDBU][Im]/EG is 92.12, 307.01, and 117.48% higher than MEA/H2O, MDEA/PZ/H2O, and MEA/AEEA/H2O at 313.15 K, respectively. This work showed that [HDBU][Im]/EG had a good mass transfer performance and great potential in future industrial applications. At the same time, the mass transfer law was summarized to provide theoretical support for CO2 capture technology and reactor design.
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