GREEN CHEMISTRY
·
2015
·Vol. 18
·期 7
·2147-2154
·
IF 8.02
Alei Zhang,Cong Gao,Jing Wang,Kequan Chen,Pingkai Ouyang
In this study, we present an efficient affinity adsorption–enzymatic reaction integrated approach to produce N-acetyl-D-glucosamine (GlcNAc) from crude chitin powders (CP). Chitinase was first purified from the crude enzyme mixture by affinity adsorption on the CP substrate, with ∼92.7% recovery of the enzyme achieved within 10 minutes in the presence of 20 g L−1 of CP under optimized conditions. The chitinase then efficiently converted 40 g L−1 of CP to 39.3 g L−1 of GlcNAc in a batch enzymatic reaction for 4 days, achieving nearly 100% conversion of the substrate CP. The product GlcNAc was easily separated from hydrolysates after destaining, concentrating, crystallizing and drying processes with a high purity of 98%. In addition, the chitinase can be conveniently reused for several batches by the affinity adsorption–enzymatic reaction approach, giving an average yield of 29.6 g L−1 of GlcNAc based on 30 g L−1 of CP as the substrate.
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FOOD CONTROL
·
2014
·
IF 2.819
Mohamed Reda Zahi,Hao Liang,Qipeng Yuan
The purpose of this research was to develop a novel antimicrobial delivery system by encapsulating d -limonene into an organogel-based nanoemulsion and investigating its antimicrobial activity. The d -limonene organogel-based nanoemulsion was prepared by high pressure homogenization method. The surfactant concentration had a major impact on the droplets' formation and distribution. At the optimal condition (10% w/w Tween 80, 100 Mpa, and 10 Cycles) the smallest droplet size ( d ≈ 36 nm) could be obtained, which has shown a narrow structure and good stability. Results from the antimicrobial activity have shown the encapsulation of d -limonene (4% w/w) into the organogel-based nanoemulsion contributed to the increase of its antimicrobial activity. In addition, the mechanism of d -limonene organogel-based nanoemulsion against the tested microorganisms was studied by the electronic microscope observation and the cell constituent release. This research would have an important implication for the design of more efficient antimicrobial systems for food preservation and production.
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Polymer-Plastics Technology and Materials
·
2024
·
IF 2.6
Jingwen Lan,Rukuan Liu,Sisi Liu,Airong Xu
Eco-friendly silk fibroin/poly(D,L-lactide-co-glycolide) (SF/PLGA) materials were successfully fabricated using a facile strategy. The materials were characterized by scanning electron micrograph (SEM), X-ray diffraction (XRD) and infrared spectra (IR). Systematic investigations were completed to examine the degradation rates in natural soil, cytocompatibility and thermostability of the materials. It is interesting to find that after SF was hybridized by PLGA, the thermostability and degradation rate increased. Meanwhile, the materials show good cytocompatibility. SEM, IR and XRD results reveal that there is hardly any interaction between SF and PLGA in the SF/PLGA material, and SF is physically mixed with PLGA. This study opens up a new horizon in the design and preparation of SF-based materials for promising applications in medical and biodegradable material fields.
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Nano-Micro Letters
·
2023
·Vol. 16
·期 1
·1-18
·
IF 26.6
Li Xudong,Qiang Zhuomin,Han Guokang,Guan Shuyun,Zhao Yang,Lou Shuaifeng,Zhu Yongming
High-entropy catalysts featuring exceptional properties are, in no doubt, playing an increasingly significant role in aprotic lithium-oxygen batteries. Despite extensive effort devoted to tracing the origin of their unparalleled performance, the relationships between multiple active sites and reaction intermediates are still obscure. Here, enlightened by theoretical screening, we tailor a high-entropy perovskite fluoride (KCoMnNiMgZnF 3 -HEC) with various active sites to overcome the limitations of conventional catalysts in redox process. The entropy effect modulates the d -band center and d orbital occupancy of active centers, which optimizes the d – p hybridization between catalytic sites and key intermediates, enabling a moderate adsorption of LiO 2 and thus reinforcing the reaction kinetics. As a result, the Li–O 2 battery with KCoMnNiMgZnF 3 -HEC catalyst delivers a minimal discharge/charge polarization and long-term cycle stability, preceding majority of traditional catalysts reported. These encouraging results provide inspiring insights into the electron manipulation and d orbital structure optimization for advanced electrocatalyst.
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IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
·
2025
·
IF 8.6
Lilong Zou,Xuan Feng,Hai Liu,Amir M. Alani,Cai Liu
Forests are vital components of the ecosystem of the Earth, regulating climate, conserving soil and water, and fostering biodiversity. Sustainable forest management offers crucial long-term benefits, but challenges such as disease threaten tree health. Disease-infected trees in both forests and urban areas pose risks to safety, property, and culture, leading to economic losses. Traditional inspection methods, such as resistance drilling, are invasive and laborious, while nondestructive techniques such as ground penetrating radar (GPR), offer promising alternatives. Although GPR shows potential, complexities such as tree structure and electromagnetic properties hinder accurate disease detection. In order to address these challenges, a new approach integrates structure-from-motion (SfM) photogrammetry with GPR measurement, and a novel holographic radar tomography processing approach has been proposed in this article. These methodologies accurately reconstruct tree trunks in 3-D, enabling precise GPR positioning and the obtaining of trunk permittivity. An arc-shaped Kirchhoff migration algorithm, moreover, helps mitigate irregular trunk shapes, enhancing data accuracy. The proposed framework demonstrates efficacy in real-tree measurement, offering high-precision disease monitoring. This innovation not only aids in preserving biodiversity but also enhances ecosystem services by promoting sustainable forest management. Effective disease monitoring ensures timely intervention, safeguarding valuable old trees and ecosystems while minimizing economic and cultural losses.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2024
·
IF 5.7
Tong Zhou,Meigui Huang,Heping Cui,Shahzad Hussain,Khizar Hayat,Xiaoming Zhang,Chi-Tang Ho
The formation pathway and mechanism of various pyrazines were investigated during the thermal treatment of the alanine-xylose Amadori compound (Ala-ARP) and exogenous alanine (Ala). 15N-labeled Ala was used to coheated with Ala-ARP to clarify the nitrogen sources and the respective contributions of exogenous Ala and the regenerated Ala released from Ala-ARP to different pyrazine formation. It was found that exogenous Ala exhibited a priority in capturing glyoxal (GO) to form pyrazine during the thermal degradation of ARP. Compared to the Ala-methylglyoxal (MGO) model, a lower activation energy was required for the Ala-GO reaction, where the reaction dynamics of Ala-GO followed a zero-order model. In addition to forming pyrazine, the interaction between existing exogenous Ala and GO would accelerate the thermal degradation of Ala-ARP and retro-aldolization reaction of deoxyxylosones (DXs) to α-dicarbonyls. During this process, the release of regenerated Ala and MGO was promoted. Accordingly, as GO was expended by exogenous Ala during the initial stage of ARP-Ala degradation, the condensation between regenerated Ala and MGO became intensified, leading to the generation of methylpyrazine and 2,5-dimethylpyrazine. As a result, in the thermally treated mixture of Ala-ARP and exogenous Ala, 55% of the formed pyrazine originated from exogenous Ala, while 63% of the formed methylpyrazine and 57% of the formed 2,5-dimethylpyrazine were derived from regenerated Ala (120 °C, 30 min).
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BIORESOURCE TECHNOLOGY
·
2015
·
IF 4.494
Xuliang Lin,Xueqing Qiu,Duming Zhu,Zihao Li,Ningxin Zhan,Jieyi Zheng,Hongming Lou,Mingsong Zhou,Dongjie Yang
Effect of the molecular structure of lignin-based polyoxyethylene ether (EHL–PEG) on enzymatic hydrolysis of Avicel and corn stover was investigated. With the increase of PEG contents and molecular weight of EHL–PEG, glucose yield of corn stover increased. EHL–PEG enhanced enzymatic hydrolysis of corn stover significantly at buffer pH 4.8–5.5. Glucose yield of corn stover at 20% solid content increased from 32.8% to 63.8% by adding EHL–PEG, while that with PEG4600 was 54.2%. Effect of EHL–PEG on enzymatic hydrolysis kinetics of cellulose film was studied by quartz crystal microbalance with dissipation monitoring (QCM-D) and atomic force microscopy (AFM). An enhancing mechanism of EHL–PEG on enzymatic hydrolysis kinetics of cellulose was proposed. Cellulase aggregates dispersed by EHL–PEG excavated extensive cavities into the surface of cellulose film, making the film become more loose and exposed. After the maximum enzymatic hydrolysis rate, the film was mainly peeled off layer by layer until equilibrium.
研究领域:
生物质转化
·
酶工程
·
高分子化学
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表面科学
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可再生能源
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Small
·
2024
·Vol. 21
·期 4
·2410657
·
IF 13
Jia Wang,De Wang,Zelin Zhao,Ganggang Chang,Wei Guo,Jun Xu,Yinyu Xiang,Junrui Li,Junsheng Li
Developing cost-effective ruthenium (Ru)-based HER electrocatalysts as alternatives to commercial Pt/C is crucial for the advancement of proton exchange membrane water electrolysis (PEMWE). However, the strong hydrogen adsorption of Ru-based catalysts restricts its activity. Herein, a strategy is reported to tune the electronic structure and improve mass transfer by implanting Ru atoms onto the (002) facet of two-dimensional zeolitic imidazolate framework-67 (Ru@ L ZIF (002) ) to optimize the d -band center ( ε d ) of Ru and the hydrogen spillover behavior. Benefiting from the ultrathin nanosheet structure and optimized ε d of Ru, the over-strong H adsorption energy is weakened and the electron/mass transfer is facilitated. Ru@ L ZIF (002) exhibits an overpotential of 9.2 mV at 10 mA cm −2 and a long-lasting stability of 35 days at 100 mA cm −2 . The mass activity and price activity of Ru@ L ZIF (002) is 2.9 and 14.7 times higher than Pt/C, respectively. More impressively, Ru@ L ZIF (002) delivers a cell voltage of 2.01 V at a high current density of 4 A cm −2 in PEMWE. The excellent long-term durability of 1200 hours operating at 4 A cm −2 with an ultralow decay rate of 7.5 × 10 −3 mV h −1 has been achieved, making it promising as a cost-effective alternative to Pt/C catalyst for PEMWE applications.
研究领域:
电催化
·
材料科学
·
能源化学
·
纳米材料
·
电化学工程
·
可持续能源技术
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CARBON
·
2026
·
IF 12.7
Xiaoyan Liu,Wei Ding,Guoxu Wang,Jizheng Zhu,Suzhen Yin,Chengbiao Wei
Lithium-sulfur (Li-S) batteries are promising next-generation energy-storage systems because of their high theoretical energy density. However, their practical application is severely hindered by sluggish sulfur redox kinetics and the shuttle effect of soluble lithium polysulfides (LiPSs). Herein, a MoS 2 @NPCNFs interlayer is designed to immobilize LiPSs and accelerate bidirectional sulfur conversion. The porous and conductive carbon nanofiber framework provides rapid electron/ion transport pathways and facilitates electrolyte penetration, while the MoS 2 component offers abundant catalytic sites for polysulfide adsorption and conversion. As revealed by density functional theory (DFT) calculations, the nitrogen-regulated electronic environment modulates the Δd-p value associated with MoS 2 . This optimized d-p orbital interaction strengthens the coupling between MoS 2 and lithium polysulfides, thereby promoting their chemical adsorption and catalytic conversion. X-ray photoelectron spectroscopy shows obvious binding-energy shifts after Li 2 S 6 adsorption, indicating strong interfacial electronic interactions. Density functional theory calculations further demonstrate that this electronic-structure regulation enhances the LiPSs chemisorption, optimizes the Gibbs free-energy evolution of sulfur redox reactions, and lowers the energy barriers for Li 2 S decomposition and Li + diffusion. Consequently, the MoS 2 @NPCNFs interlayer enables efficient bidirectional catalysis of polysulfide reduction, effectively suppressing the shuttle effect and improving reaction kinetics. The assembled Li-S battery delivers high initial discharge capacities of 1262.9 mAh·g −1 at 0.2C and 916.0 mAh·g −1 at 1C, and maintains excellent cycling stability over 1000 cycles at 1C with a low capacity decay rate of 0.043% per cycle. This work provides an electronic-structure-regulation strategy for designing advanced interlayers toward high-performance Li-S batteries. Download: Download high-res image (276KB) Download: Download full-size image
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2026
·
IF 4.8
Mengjiao Pang,Yanjie Wang,Zengcheng Du,Qiqing Chen,Wenhao Liu,Miaoduo Deng,Yuanyuan Xie,Mingfang Zhu
In this study, a water-soluble perovskite quantum dot (PQDs) based on CsPbI 3 "on-off-on" fluorescent probe was successfully constructed. The probe exhibits red fluorescence emission at 660 nm under 465 nm excitation, and the response mechanism of Cu 2+ -induced fluorescence quenching (OFF) and D-penicillamine (D-PA) triggered fluorescence recovery (ON) is realized. In addition, the dual target detection platform of both copper ions (Cu 2+ ) and D-PA was established. Quantitative analysis showed that the detection linearity range was 0.5–15 μM (LOD = 0.21 μM) for Cu 2+ and 0.4–60 μM (LOD = 16.7 nM) for D-PA. Meanwhile, D-PA can be semi-quantitatively measured based on the change in solution color. The fluorescent probe provides a fast response time, high sensitivity, and convenient solution for real-time detection of Cu 2+ and D-PA. And it was applied in the determination of D-PA in serum samples with satisfactory results. It is particularly noteworthy that the synthesized perovskite quantum dots exhibit excellent stability in the aqueous environment, which provides a new strategy for expanding the application of perovskite materials in the field of biomedical analysis.
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PHYTOTHERAPY RESEARCH
·
2026
·
IF 8.1
Lina Dong,Yuanxia Gao,Qian Li,Guangxin Chen,Dong Yang,Liping Zhao,Xiaojing Liu,Shumei Lin
Ulcerative colitis (UC) is a chronic inflammatory disease of the colon with limited effectiveness and safety of current drug therapies. Betulinic acid (BA) is a naturally occurring pentacyclic triterpenoid present in traditional Chinese medicines used clinically as retention enemas for UC, but its direct effects and mechanisms remain unclear. This study evaluated the therapeutic impact of BA enema in dextran sulfate sodium (DSS)-induced colitis by monitoring disease activity index (DAI), colon length, and histopathology, and by assessing inflammatory cytokines, mucosal tight junction, and mucin-2 (MUC2) expression. Colonic mucosa-associated microbiota were profiled by 16S rRNA gene sequencing. Potential BA targets were predicted using Swiss Target Prediction and validated by molecular docking, molecular dynamics simulations, cellular thermal shift assay, and biolayer interferometry. The functional relevance of the vitamin D receptor (VDR) was examined using a VDR antagonist in vivo and in vitro, and transcriptomic datasets from UC patients were analyzed to define VDR expression patterns. BA enema markedly attenuated DSS-induced colitis, such as reducing the DAI, inhibiting colonic damage, and improving colon length shortening. The BA also significantly restored the tight junction proteins, associated mucin proteins, and mucin-2 (MUC2). The BA reduced potentially pathogenic bacteria in the colonic mucosa. In addition, BA significantly restored the VDR proteins, and the VDR antagonist weakened the effects of BA in vivo and in vitro. The binding site between VDR and BA was Trp286. Transcriptomic analyses confirmed VDR downregulation in UC. These findings indicate that BA enema alleviates experimental colitis in part by targeting VDR to protect the intestinal mucosal barrier and modulate mucosa-associated microbiota, supporting BA as a promising candidate for UC treatment.
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PLASMA CHEMISTRY AND PLASMA PROCESSING
·
2022
·Vol. 43
·期 2
·491-511
·
IF 3.337
Huang Shaoyong,Huang Quanjia,Gan Jiaming,Li Ting,Wang Lei
In this study, Fe-rich sludge was pretreated by dielectric barrier discharge (DBD) and used as a Fenton catalyst for the degradation of 2,4-dichlorophenoxyacetic acid (2,4-D) in aqueous solution, where hydrogen peroxide was in situ supplied from a glow discharge plasma (GDP) in contact with the solution. Synergistic mechanism of the two plasmas during 2,4-D degradation was explored. The Fe-rich sludge pretreated by H 2 -DBD could significantly accelerate the 2,4-D degradation as it converted Fe(III) in the sludge to the active Fe(II). 2,4-D can be completely removed in the presence of H 2 -DBD pretreated Fe-rich sludge with 25 min of GDP at pH 0 3.0 and catalyst dosage of 1.0 g/L. Quenching experimental studies showed that both ·OH (oxidative degradation) and ·H (reductive dechlorination) were responsible for 2,4-D degradation. Reducing radicals (such as ·R and·H) formed during GDP can continuously reduce the Fe 3+ back to Fe 2+ , which further promoted the degradation and dechlorination of 2,4-D. The results of three consecutive experiments indicated the stability and reusability of catalyst. This study provides a potential method for the recycle of Fe-rich sludge as a novel and cost-effective catalyst for 2,4-D removal from aqueous environments, which is significant for the terminal disposal of Fe-rich sludge. Graphical Abstract
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