Foods
·
2023
·Vol. 12
·期 12
·2424
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IF 5.2
Yang Zhao,Xinrui Li,Shuo Guo,Jingwen Xu,Yan Cui,Mingzhu Zheng,Jingsheng Liu
Xylanases are the preferred enzymes for the extracting of oligosaccharides from wheat bran. However, free xylanases have poor stability and are difficult to reuse, which limit their industrial application. In the present study, we covalently immobilized free maleic anhydride-modified xylanase (FMA-XY) to improve its reusability and stability. The immobilized maleic anhydride-modified xylanase (IMA-XY) exhibited better stability compared with the free enzyme. After six repeated uses, 52.24% of the activity of the immobilized enzyme remained. The wheat bran oligosaccharides extracted using IMA-XY were mainly xylopentoses, xylohexoses, and xyloheptoses, which were the β-configurational units and α-configurational units of xylose. The oligosaccharides also exhibited good antioxidant properties. The results indicated that FMA-XY can easily be recycled and can remain stable after immobilization; therefore, it has good prospects for future industrial applications.Keywords:immobilized enzymes;kinetics;thermodynamics;wheat bran;oligosaccharide
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PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Wei Zhao,Zilu Liu,Song Yang,Na Xu,Xiaokun Li,Gan Luo,Zhenjiang Wu,Shoujun Liu,Chao Yang
An aqueous carbon black slurry was prepared by esterifying polystyrene-maleic anhydride with isobutanol as the esterifying agent and using the esterified product as a dispersant for carbon black. The effects of grinding time and dispersant addition on the ground particle size of carbon black before and after the esterification modification were investigated, as well as the effect of SMA dispersant on the dispersion stability of carbon black. The carbon black slurry was investigated by introducing external conditions such as temperature and pH, and the microscopic dispersion of the ink was observed by SEM. The results showed that the dispersion effect of the isobutanol-modified SMA was stronger than that of the unmodified SMA, the particle size of the carbon black paste reached 84 nm with the best stability when the dispersant was added at 4 % and the grinding time was 120 min. FTIR and XRD results showed that the surface groups of the carbon black interacted with the groups of the dispersant to achieve dispersion stability. This study not only provides directions for the selection of dispersant for carbon black in new aqueous media but also confirms the practicality of black colour pastes in gel inks and provides a theoretical reference for the development of pigment-based gel inks.
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ENERGY & FUELS
·
2021
·
IF 3.605
Ruzhen Cheng,Run Zou,Long He,Lei Liu,Chang Cao,Xinyuan Li,Xuhong Guo,Jun Xu
The precipitation and deposition of asphaltenes often cause great troubles to the recovery and transportation of crude oil. Adding polymer inhibitors is an effective approach to prevent asphaltenes from clogging. In this study, maleic anhydride-co-octadecene copolymers with imidazolyl, phenyl, and pyridyl pendants were synthesized. The inhibition behaviors of two extracted asphaltenes in the presence of these copolymers were investigated, which were also identified by the rheological tests of the heavy crude oil sample. The chemical structure of both asphaltenes was analyzed by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), elemental analysis, and time-of-flight (TOF) spectrometry. Both asphaltenes A and B have a high aromaticity and low H/C. However, asphaltene B has a much higher aromaticity and polarity than that of asphaltene A. Ultraviolet–visible spectroscopy, turbidity meter, and dynamic light scattering (DLS) were employed to determine the precipitation behaviors of asphaltenes in the absence and presence of copolymers. The influence of intrinsic properties of asphaltenes, polymer concentration, and aromatic group grafting ratio on asphaltene precipitation were also compared. It is found that the initial precipitation point (IPP) of both asphaltenes is increased most by the copolymer containing 2-aminopyridine (PMO-2-P), while the copolymer containing N-(3-aminopropyl)imidazole (PMO-I) shows the worst inhibition performance. It is because that pyridine group has a stronger adsorption capacity with asphaltene than the imidazole group. The effect of various functional groups in copolymers on inhibiting asphaltene precipitation conforms to the following sequence: 2-aminopyridine > aniline > 4-aminopyridine > N-(3-aminopropyl)imidazole. It is also found that high polymer concentration and grafting ratio are beneficial to inhibit the asphaltene precipitation. As a result of the π–π conjugation and hydrogen-bonding attractions between the aromatic groups in the copolymers and the asphaltenes, the polymers can be stably adsorbed onto the surface of the asphaltenes and prevent their aggregation.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Ganwei Zhang,Xinying Jia,Jiale Xing,Shusu Shen,Xiaoji Zhou,Jingjing Yang,Yongfu Guo,Renbi Bai
Poly(styrene-co-maleic anhydride) (PSMA) and polyethyleneimine (PEI) are used to coat various substrates via a facile and fast process to improve their oil/water separation performances. Substrates including polyvinylidene fluoride (PVDF) microfilter membrane, cotton fabric, nylon mesh, and stainless steel mesh are initially coated with PSMA and subsequently with PEI to yield cross-linked copolymer coatings. The coating procedure can be finished in 30 min. Notably, the copolymer coating can endow the substrate with superhydrophilic and underwater superoleophobic properties, as well as dynamic underwater anti-oil-fouling performance. The successful coating of cross-linked copolymers onto the substrate surface was verified by SEM, ATR-FTIR, and XPS characterization. All of the coated substrates can be used for the separation of the oil/water mixture, and the coated PVDF microfilter membrane offers excellent oil/water emulsion separation performance. More importantly, the coatings can withstand exposure to acidic and basic media as well as repeated and long-term usage.
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ACS Applied Materials & Interfaces
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2025
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IF 8.2
Ying Zhong,Xiao Chen,Shiyao Liu,Huibin Liu,Deng Hu,Gwendoline Lafaye,Changhai Liang
The industrial advancement of downstream products resulting from the directed hydrogenation of maleic anhydride is hindered by the limitations related to the activity and stability of catalysts. The development of nonprecious metal intermetallic compounds, in which active sites are adjustable in the local structures and electronic properties embedded within a distinct framework, holds immense potential in enhancing catalytic efficacy and stability. Herein, we report that nickel-based silicides catalysts, RNi2Si2 (R = Ca, La, and Y), afford high efficiency in the selective hydrogenation of maleic anhydride. Among the RNi2Si2 with the same tetragonal structure, CaNi2Si2 with complete isolation and highest electron density of Ni sites presents the low apparent activation energy (98.4 kJ/mol). Preferential adsorption of intermediate succinic anhydride via C═O bonds is achieved by the high oxygen affinity of CaNi2Si2, resulting in chemoselectivity to γ-butyrolactone (>80%). Additionally, the silicide with good resistance to sintering and acid corrosion presents remarkable stability for at least 130 h. The design of the silicide structure will offer fresh perspectives on the development of effective and enduring selective hydrogenation catalysts.
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ACS Applied Polymer Materials
·
2024
·
IF 4.4
Mengyao He,Rui Liu,Xiaoli Li,Gan Zhang,Guanxing Lao,Song Guo,Yuanli Liu
Compared with traditional luminescent materials, nonconventional luminogens have been extensively studied due to their unique properties and wide range of applications. However, the study of nonconventional luminescent polymers is rare because most luminescent polymeric materials can only emit light at high concentrations and require noble metal catalysts for synthesis. Particularly, their application in the field of metal ion detection and biological imaging is still restricted. To expand its application scope, this work designed a series of luminescent polymeric materials only containing carboxyl and amide groups, which were synthesized from poly(methyl vinyl ether maleic anhydride) and 4-(2-aminoethyl)morpholine at different molar ratios (PMVEMA/AML are 1:1, 1:2, and 1:3). The synthesized luminogens exhibited controllable luminescence colors and excellent solubility in various commonly used solvents. Additionally, the polymers can achieve luminescence in dilute solutions, and the maximal luminescence efficiencies can be up to 5.55%. At last, polymer M3 with good biocompatibility and low cytotoxicity can be used to sensitively detect Mg2+ ions in vivo and in vitro. Notably, polymer M3 possesses the ability to target the organelle lysosome in cell imaging.
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CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Baoying Liu,Dejian He,Zhenhua Wang,Haoning Li,Xiaomin Fang,Tao Ding,Wenkai Zhang,Zhiwei Li
Glass fiber-reinforced polyamide 6 (PA6/GF) composites are widely used due to their excellent mechanical and thermal properties, but the glass fibers exacerbate flammability via the “candlewick effect”. Conventional flame retardants require high loadings (>15 wt%), which degrade mechanical performance and processing, limiting practical use. Herein, we developed a dual-functional interfacial flame-retardant strategy through incorporating a DOPO-functionalized compatibilizer, poly(DOPO-hydroxyethyl acrylate- co -maleic anhydride) [P(DH-co-MA)]. P(DH-co-MA) covalently bonds to the glass fiber surface via maleic anhydride groups, significantly improving fiber-matrix interfacial adhesion and composite integrity. With a minimal addition of 0.6 wt% P(DH-co-MA) and 10 wt% base flame-retardant system, the modified composites achieve a limiting oxygen index (LOI) of 33.8 %, UL-94 V -0 rating, and a 30.2 % reduction in peak heat release rate (pk-HRR). Moreover, tensile strength, flexural modulus, and impact strength increase by 4.2 %, 5.5 %, and 17.4 %, respectively. Thermogravimetric analysis and char residue characterization indicate that P(DH-co-MA) promotes interfacial char formation and gas-phase radical quenching, exhibiting a dominant gas-phase flame-retardant mechanism. This study offers a viable and efficient route for developing high-performance, interface-engineered flame-retardant polymer composites, achieving simultaneous improvements in mechanical robustness and fire safety at low additive levels. Notably, the DOPO-functionalized compatibilizer can be readily applied for surface-tailored sizing of glass fibers, enabling in situ modification without altering existing processing protocols.
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JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
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2025
·
IF 1.9
Mei Tang,Shunxin Liu,Ping Guo,Zhendi Ma,Xiaorong Hu
As a new class of porous materials, hyper-crosslinked polymers can adsorb heavy metal ions from aqueous solutions. This requires them to possess good surface hydrophilicity and active functional groups that can interact with heavy metals. In this research, three polymers, namely MAH-1, MAH-2, and MAH-3, were synthesized via the Friedel–Crafts alkylation reaction using phenyl maleic anhydride (MAH) as the monomer and dimethoxymethane (FDA), 1,4-p-dichloro-benzyl (DCX), and biphenyl dichlorobenzyl (BCMBP) as cross-linkers, respectively. The effect of the molecular size of the cross-linkers on polymer yields, morphology, and Pb2+ adsorption property was investigated. The yield of MAH-1 was low, and the product was soluble in methanol. This implied that when the cross-linker molecule was short, the steric hindrance caused by the substituents on the monomer benzene ring impeded polymer formation. MAH-2 formed nanoparticles that extended into thin sheets, while MAH-3 only formed nanoparticles, exhibiting clearly different morphologies. After alkalization, the maximum Pb2+ adsorption capacities of the two polymers, determined by the Langmuir adsorption isotherm, were 216 mg g−1 and 134 mg g−1, respectively. Both polymers were applied to treat Pb2+ in simulated battery wastewater with a concentration of 32 mg L−1, and both reduced the concentration to below 0.55 mg L−1, meeting the requirements of the Lead and Zinc Industrial Pollutant Discharge Standard GB 25466-2010 (National Standards of the People’s Republic of China). Additionally, the materials demonstrated good reusability and showed potential for treating lead-contaminated water.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Lijun Fan,Yanbei Chen,Xianhong Zhang,Wantai Yang
Emulsion polymerization conducted in the presence of polymeric emulsifiers is a new strategy to reduce the possible environmental pollution and product performance degradation caused by small molecular emulsifier residue. However, rare literature has reported on the research field of vinyl chloride (VC). This study constructed a facile and efficient VC emulsion polymerization system by utilizing a modified poly(maleic anhydride-co-vinyl pivalate) (PMVP) copolymer as a polymeric emulsifier. Concretely, PMVP copolymer microspheres are synthesized first via self-stabilized precipitation polymerization (2SP) between maleic anhydride (MAH) and vinyl pivalate (VPi). The effects of key reaction parameters, including solvent composition, monomer feed ratios, reaction temperature, and monomer/initiator dosages on the present 2SP polymerization are investigated systematically. As a result, monodisperse PMVP microspheres with tunable particle sizes (Dn, 800–1300 nm), low number-average molecular weight (Mn ∼ 2300 g/mol), and high yield (>90%) are successfully prepared in the methyl tert-butyl ether/n-hexane (m/m = 3:2) mixture solvent, which is screened as the optimal reaction medium. Subsequently, PMVP microspheres are ammonia-hydrolyzed and further applied as effective polymeric emulsifiers for VC emulsion polymerization. Gratifyingly, poly(vinyl chloride) (PVC) emulsion is synthesized successfully with high monomer conversion. The size of PVC latex can be tuned depending on the emulsifier concentration. More importantly, the final emulsion exhibits outstanding colloidal stability against thermal, mechanical force, freeze–thaw, and Ca2+ ions. In summary, this work has successfully constructed a PVC emulsion polymerization by employing PMVP-based copolymers as functional polymeric emulsifiers, offering a promising platform for emulsion polymerization applications.
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PHARMACEUTICAL DEVELOPMENT AND TECHNOLOGY
·
2026
·
IF 2.5
Fuyou Wang,Qingmin Liu,Wenhui Wu,Yuxiao Su,Zhimei Song,Runliang Feng
Purpose In order to develop reduction-responsive nano-drug delivery system for encapsulating antifungal drugs.Methods Herein, with poly (isobutene-alt-maleic anhydride) as skeleton, we synthesized a polymer containing cross-linked disulfide bonds to prepare reduction-responsive ketoconazole-loaded nanoparticles (MPEG-P-KET). The in vitro reduction-responsive behavior and antifungal activity of MPEG-P-KET were investigated.Results The MPEG-P-KET improved the dispersion and solubility of lipophilic KET. KET’s imidazole group formed a salt with the free carboxyl groups in the polymer carrier, resulting in delayed drug release from MPEG-P-KET. However, MPEG-P-KET still exhibited reduction-sensitive drug release behavior, and showed comparable antifungal activity with KET in vitro. Interestingly, MPEG-P-KET demonstrated higher ability to inhibit biofilm formation and disrupt mature biofilms than KET.Conclusion The polymeric nanoparticles with disulfide bonds could be used for the encapsulation and controlled delivery of antifungal drugs in the field of fungal infection treatment.
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Materials Today Communications
·
2023
·
IF 3.8
Jiajun Xu,Shiai Xu,Junzhe Hao,Hailian Cao,Han Miao
The good adhesion between layers of aluminum (Al)/polymer composite is necessary for the safety of lithium-ion batteries. The Al foil was converted with environmentally friendly trivalent chromate [Cr(III)] to enhance its adhesive strength with the inner adhesive layer. The morphology, composition and adhesive strength with maleic anhydride grafted polypropylene (mPP) of different Cr-converted Al foils were studied. The Cr conversion coating mainly consists of metal oxides and hydroxides and the interfacial adhesion strength is enhanced by 93 % through Cr(III) conversion treatment. The effect of Cr conversion on the acid-base characteristics on the Al was determined through contact angle measurement. The results reveal that Cr conversion increases the acidity of the Al surface. The bonding mechanism at the interface was further studied fundamentally. To study the reaction at the interface mPP/Al foils, a coating-evaporation technique was utilized to fabricate a nano-thick mPP layer on the Al foils. The morphology and thickness of the mPP coating on the substrate were analyzed using atomic force microscopy and the interfacial reaction was characterized through attenuated total reflection-Fourier Transform Infrared Spectroscopy. The bonding mechanism at the molecular level was further investigated by quantum chemical calculations based on density function theory. The results of theoretical calculations further indicate that the strength of the interfacial interaction between mPP and Cr oxides and hydroxides is stronger than that between mPP and Al oxides and hydroxides.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Bingzheng Jiang,Jiaxin Li,Dong Chen,Li Wang,Wantai Yang
The development and application of high-efficiency coal-water slurry (CWS) dispersants can foster the clean utilization of natural coal. CWS with excellent flowability and stability requires good adsorption capacity of dispersant on pulverized coal surface, which is influenced substantially by the architecture and hydrophilicity of dispersants molecule. In this study, a series of neutralized sulfonated poly(styrene- alt -maleic anhydride) (NSPSM) with different molecular weight (M n ) and sulfonation degree (SD) were synthesized by self-stabilized precipitation polymerization (2SP), gas-solid heterogeneous sulfonation reaction (GSR) and neutralization reaction with NaOH. The performance of NSPSM for CWS, and their dispersion and stabilization mechanisms were investigated in detail. Under optimized conditions, maximum slurry concentration (MSC) and water separation ratio (WSR) of slurry with NSPSM could reach 66.5% and 2.0%, respectively, which are superior to commercial naphthalene sulfonate formaldehyde condensate (NSF) dispersant. The outstanding dispersibility of NSPSM was ascribed to its improved adsorption capacity due to increased charge density along polymer chain, which can prevent agglomeration among coal particles through electrostatic repulsion.
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