COLLOID AND POLYMER SCIENCE
·
2023
·Vol. 301
·期 6
·613-622
·
IF 2.4
Shu Dan,Tu Sicong,Mai Shuting,Xu Jian,Yang Wuli
Cross-linked polymer microspheres are widely used in biomedicine, flat panel display, analytical testing, in vitro diagnostics, semiconductor chips, and light diffusion. However, the process of preparing micron-sized cross-linked polymer microspheres is complicated, and it is difficult to obtain a high crosslinking degree conveniently. In this work, we applied post-crosslinking strategy to prepare poly (methyl methacrylate) (PMMA) microspheres having a high crosslinking degree by dispersion polymerization, while the method separated the polymerization process and cross-linking process of microspheres. In the method, the silane coupling agents containing double bonds were used as the comonomer in polymerization and hydrolyzed to form Si–O–Si cross-linked structure at the later stage. The obtained microspheres are not only highly cross-linked but also have uniform particle size distribution and good thermal stability. The produced cross-linked PMMA microspheres exhibit great light diffusion properties and might be employed as a light diffusion agent in a polycarbonate matrix. Graphical Abstract We prepared the cross-linked PMMA microspheres by post-crosslinking method and mixed the cross-linked PMMA microspheres with the matrix PC to obtain the light diffusers.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 21
·60574-60589
·
IF 5.8
Zhang Xiaoting,Liu Yang,Qu Lingbo,Han Runping
In this study, a green adsorbent (Fe 3 O 4 -UiO-66-NH 2 ) with the ability of addressing the issues of separation and recovery of UiO-66-NH 2 is obtained using a simple co-precipitation method under environmentally benign conditions. Various characterization techniques are utilized for evaluating the properties of the developed adsorbent. The capability of Fe 3 O 4 -UiO-66-NH 2 towards 2,4-dichlorophenoxyacetic acid (2,4-D) and glyphosate (GP) from solution is explored. The results revealed that the magnetization process did not destroy the crystal structure of UiO-66-NH 2 , which ensured that Fe 3 O 4 -UiO-66-NH 2 had good adsorption performance for 2,4-D and GP. The adsorption processes showed a wide pH application range, high salt tolerance, and regeneration performance as well as an excellent adsorption rate. Results from thermodynamic study showed that both processes were spontaneous and endothermic. The unit uptake ability of Fe 3 O 4 -UiO-66-NH 2 for 2,4-D and GP reached up to 249 mg·g −1 and 183 mg·g −1 from Langmuir model at 303 K, respectively. When solid–liquid ratio was 2 g·L −1 , Fe 3 O 4 -UiO-66-NH 2 can reduce the content of 2,4-D or GP with the initial density of 100 mg·L −1 below the drinking water requirement limit. In addition, the reusability efficiency of Fe 3 O 4 -UiO-66-NH 2 towards 2,4-D and GP was found to be 86% and 80% using 5 mmol·L −1 NaOH as eluent. Analysis of simulated water samples indicated that Fe 3 O 4 -UiO-66-NH 2 could achieve the single or simultaneous removal of 2,4-D and GP from wastewater. Summarily, Fe 3 O 4 -UiO-66-NH 2 as a green adsorbent can serve as an alternative for removing 2,4-D and GP from water body.
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ANALYTICAL SCIENCES
·
2023
·Vol. 39
·期 7
·1171-1178
·
IF 1.6
Wang Kun,Gao Xue,Chen Jianfeng,Yang Xiaoyan
Abstract In this study, a sensitive photoelectrochemical immunosensor with dye-enhanced anodic photocurrent response was proposed for sensitive detection of α-fetoprotein (AFP). Specifically, europium-doped TiO 2 (Eu-TiO 2 ) was used as the photoelectrochemical functional material and coated onto indium tin oxide (ITO) electrode. Doxorubicin (DOX) as an excellent fluorescent dye was encapsulated in the hydrophobically modified alginate (HMA). Then the dye-loaded HMA was modified onto the surface of Eu-TiO 2 to further sensitize the photocurrent response. The results showed that the photoelectrical signal was enhanced and stabilized due to the effect of sensitization of DOX on Eu-TiO 2 material. The constructed PEC sensor revealed a good linear response to AFP antigen ranging from 0.5 to 100 ng/mL with a detection limit of 0.41 pg/mL. The clinical patient’s serum test results obtained from the proposed PEC immunosensor were consistent with those obtained from the commercial electrochemilunescence assay. The proposed PEC sensing method could be a promising analytical tool for the detection of AFP in clinical analysis. Graphical abstract
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JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 3
·1-10
·
IF 2.8
Jiang Yuanping,Liu Lian,He Guohang,Shang Ning,Xie Yingying,Han Huan,Ma Mingyang,Li Xiang
A flame retardant precursor named DTDO, which contains phosphorus, nitrogen and silicon, was synthesized and grafted to graphene oxide (GO) to prepare functional graphene oxide (FGO), which was further applied to prepare a crosslinked organic/inorganic hybrid intumescent flame retardant (FGOS) through in situ sol gel process. 3 wt% loading of FGOS can reduce the combustion parameters of inflammable epoxy resin (EP) obviously, such as the heat release rate (28.1% reduction), smoke production rate (19.6% reduction), and average mass loss rate (61.2% reduction). The EP/FGOS-3 sample shows a LOI value of 29.1% and passes UL-94 and V-0 flammability rating, and the char residue increased from 0.3% to 8.5%. The results indicates a significant enhanced flame retardancy of EP, phosphorus, nitrogen, silicon, and GO in FGOS promoted the forming of a compact and porous char layer, thus to prevent further combustion and improve the flame retardancy of EP.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2023
·Vol. 41
·期 11
·1733-1746
·
IF 4.3
Wei Chunxiang,Gao Tianyu,Xu Yu,Yang Wenjie,Dai Guangjian,Li Ruiting,Zhu San E.,Yuen Richard K. K.,Yang Wei,Lu Hongdian
The integration of high mechanical toughness, impact strength as well as excellent flame-retardant properties toward epoxy resins (EPs) have always been a dilemma. The inadequate overall performance of EPs severely restricts their sustainable utilization in engineering aspects over long-term. Herein, a new bio-based agent (diglycidyl ether of magnolol phosphine oxide, referred as DGEMP) derived from magnolol (classified as lignan), extracted from natural plants Magnolia officinalis, was successfully synthesized and further employed as a flame-retardant reactive additive to diglycidyl ether of bisphenol A (DGEBA). As demonstration, the composite resin, DGEBA/15DGEMP (15 wt% DGEMP), achieved an Underwriters Laboratories-94 V-0 rating with a high limiting oxygen index (LOI) value (41.5%). In cone calorimeter tests, it showed that heat release and smoke production were effectively inhibited during combustion, wherein the peak heat release rate (PHRR) value of DGEBA/15DGEMP was reduced by 50% compared to neat DGEBA. Additionally, it exhibited a superior tensile strength (82.8 MPa), toughness (5.11 MJ/m 3 ) and impact strength (36.5 kJ/m 2 ), much higher than that of neat DGEBA (49.7 MPa, 2.05 MJ/m 3 and 20.9 kJ/m 2 ). Thus, it is highly anticipated that DGEMP imparts significantly improved mechanical and fire-retarded properties to conventional EPs, which holds a great potential to address the pressing challenges in EP thermosets industry.
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MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 3
·1-10
·
IF 5.7
Shi Min,Xue Shu-Ya,Peng Guan-Wei,Xu Jing-Kun,Gao Yan-Sha,Liu Shu-Wu,Duan Xue-Min,Lu Li-Min
Graphdiyne (GDY) has attracted a lot of interest in electrochemical sensing application with the advantages of a large conjugation system, porous structure, and high structure defects. Herein, to further improve the sensing effect of GDY, conductive MWCNTs were chosen as the signal accelerator. To get a stable composite material, polydopamine (PDA) was employed as connecting bridge between GDY and MWCNTs-NH 2 , where DA was firstly polymerized onto GDY, followed by covalently linking MWCNTs-NH 2 with PDA through Michael-type reaction. The formed GDY@PDA/MWCNTs-NH 2 composite was then explored as an electrochemical sensor for benomyl (Ben) determination. GDY assists the adsorption and accumulation of Ben molecules to the sensing surface, while MWCNTs-NH 2 can enhance the electrical conductivity and electrocatalytic activity, all of which contributing to the significantly improved performance. The proposed sensor displays an obvious oxidation peak at 0.72 V (vs. Hg|Hg 2 Cl 2 ) and reveals a wide linear range from 0.007 to 10.0 µM and a low limit of detection (LOD) of 1.8 nM ( S / N = 3) toward Ben detection. In addition, the sensor shows high stability, repeatability, reproducibility, and selectivity. The feasibility of this sensor was demonstrated by detecting Ben in apple and cucumber samples with a recovery of 94–106% and relative standard deviations (RSDs) less than 2.3% ( n = 5). Graphical Abstract A sensitive electrochemical sensing platform was reported for benomyl (Ben) determination based on a highly stable GDY@PDA/MWCNTs-NH 2 composite.
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WATER AIR AND SOIL POLLUTION
·
2023
·Vol. 234
·期 3
·1-12
·
IF 2.9
Liu Caiying,Liu Yanyan,Feng Jiapeng,Li Yaru,Tao Jun,Xie Xiaoxiao
The paper aims to evaluate the effectiveness of biochar prepared from the co-pyrolysis of rice husk and cow bone (RHCBC) for in situ remediation and amelioration of Cd-contaminated soil. Effects of RHCBC on Cd bioavailability in soil and Cd uptake in corn growth were investigated through cultivation experiments and pot experiments. The results showed that the addition of RHCBC in the Cd-contaminated soil achieved the increase of soil pH, CEC, and SOM, whereas the soil available Cd content was reduced by 29.08–51.06%, which was proved by the transformation of Cd from acid soluble and exchangeable state to residual state. Furthermore, the nutrient contents of soil were also increased by 82.41–230.09% for alkali-hydrolyzable N, 66.81–144.03% for available P, and 16.20–77.70% for available K, respectively, which promoted the growth of corn. Overall, it is a promising strategy to employ RHCBC for in situ remediation of Cd-contaminated soil and promotion of plant growth as efficient soil amendment.
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APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
·
2023
·Vol. 107
·期 5
·1751-1764
·
IF 5
Hamouda Hamed I.,Fan Yi-Xuan,Abdalla Mohnad,Su Hang,Lu Ming,Li Fu-Li
Abstract Lam16A is a novel GH16 β-1,3–1,4-lichenase isolated from the genus Caldicellulosiruptor which can utilize untreated carbohydrate components of plant cell walls. Its catalytic module has been characterized that the six carbohydrate-binding modules (CBMs) were queued in the C-terminus, but their roles were still unclear. Here, full-length and CBM-truncated mutants of Lam16A were purified and characterized through heterologous expression in Escherichia coli . The profiles of these proteins, including the enzyme activity, degrading efficiency, substrate-binding affinity, and thermostability, were explored. Full-length Lam16A with six CBMs showed excellent thermostability and the highest activity against barley β-glucan and laminarin with optimum pH of 6.5. The CBMs stimulated degrading ability of the catalytic module, especially against β-1,3(4)-glucan-based polysaccharides. The released products from β-1,3–1,4-glucan by Lam16A or its truncated mutants revealed an endo-type glycoside hydrolase. Lam16As exhibited strong binding affinities to the insoluble polysaccharides, especially Lam16A-1CBM. The degradation of yeast cell walls by Lam16A enzyme solution relative to the control reduced the absorbance values at OD 800 by ~ 85% ± 1.2, enabling the release of up to ~ 0.057 ± 0.0039 µg/mL of the cytoplasmic protein into the supernatant, lowering the viability of the cells by ~ 70.3% ± 6.9, thus causing significant damage in the cell wall structure. Taken together, CBMs could influence the substrate specificity, thermal stability, and binding affinity of β-1,3–1,4-glucanase. These results demonstrate the great potential of these enzymes to promote the bioavailability of β-1,3-glucan oligosaccharides for health benefits.
Key points
Carbohydrate-binding modules strongly influenced the enzyme activity and binding affinity, and further impacted glycoside hydrolase activity.
Lam16A enzymes have sufficient ability to hydrolyze β-1,3–1,4-glucan-based polysaccharides.
Lam16As provide a powerful tool to promote the bioavailability of β-1,3-glucan oligosaccharides.
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JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 5
·3311-3320
·
IF 2.1
Li Kai,Qin Renchi,Xiong YiQuan,Ding Ling,Wen JianWu,Zeng Min
Despite the high theoretical capacity of iron-based anode materials, they still perform poorly in electrical conductivity and volume expansion during the charge/discharge process, which can reduce battery life and cause deterioration in cycle performance. In the present study, iron-based metal–organic frameworks are synthesized through a simple co-precipitation method, and then heat-treated as a self-sacrificing template to obtain carbon-coated Fe 3 O 4 of a porous ortho-octahedral structure. As revealed by electrochemical performance studies, this material maintains a high specific capacity, showing a reversible capacity of 1063 mAh/g and 896 mAh/g after 300 cycles at a current density of 0.5 A/g and 1 A/g. By analyzing the functional mechanism of surface carbon coating, it is demonstrated that the fast ion migration and high electrical conductivity required for fast charging and discharging are ensured by the octahedral and hierarchical void structure of the carbon framework. This study thus provides a reference for the design of high-performance electrode materials. Graphical Abstract
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-11
·
IF 16.6
Chen Zhe,Li Jili,Meng Lingshen,Li Jianan,Hao Yaming,Jiang Tao,Yang Xuejing,Li Yefei,Liu Zhi-Pan,Gong Ming
Simultaneously achieving abundant and well-defined active sites with high selectivity has been one of the ultimate goals for heterogeneous catalysis. Herein, we construct a class of Ni hydroxychloride-based inorganic-organic hybrid electrocatalysts with the inorganic Ni hydroxychloride chains pillared by the bidentate N-N ligands. The precise evacuation of N-N ligands under ultrahigh-vacuum forms ligand vacancies while partially retaining some ligands as structural pillars. The high density of ligand vacancies forms the active vacancy channel with abundant and highly-accessible undercoordinated Ni sites, exhibiting 5-25 fold and 20-400 fold activity enhancement compared to the hybrid pre-catalyst and standard β-Ni(OH) 2 for the electrochemical oxidation of 25 different organic substrates, respectively. The tunable N-N ligand can also tailor the sizes of the vacancy channels to significantly impact the substrate configuration leading to unprecedented substrate-dependent reactivities on hydroxide/oxide catalysts. This approach bridges heterogenous and homogeneous catalysis for creating efficient and functional catalysis with enzyme-like properties.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2023
·Vol. 415
·期 12
·2209-2215
·
IF 4.3
Dai Tiantian,Qiu Mingyue,Li Hongyu,Yang Mingyan,Gao Jie,Li Xinmin,Lv Jiajia,Yang Minghui,Yuan Zeli,Luo Junjun
In this work, a simple and sensitive electrochemical sensor was proposed for the detection of β-site amyloid precursor protein cleaving enzyme 1 (BACE1) activity. Firstly, the BACE1 specific peptide was modified onto the Au electrode to graft a single-strand DNA with polycytosine DNA sequence (dC 12 ) via amide bonding between peptide and dC 12 . Because the dC 12 is abundant in phosphate groups, thus it can react with molybdate to form redox molybdophosphate, which can generate electrochemical current. Using BACE1 as a model peptidase, the proposed sensor shows a linear response range from 1 to 15 U/mL and limit of detection down to 0.05 U/mL. The sensor displays good performance for the BACE1 activity detection in human serum samples, which may have potential applications in the clinical diagnostics of Alzheimer’s disease. Graphical Abstract
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Bioresources and Bioprocessing
·
2023
·Vol. 10
·期 1
·1-10
·
IF 4.6
Zhang Man,Huang Zheng-Yu,Su Ying,Chen Fei-Fei,Chen Qi,Xu Jian-He,Zheng Gao-Wei
Tetrahydroisoquinoline alkaloids (THIQAs) are ubiquitous compounds with important pharmaceutical and biological activity. Their key N-heterocyclic structural motifs are synthesised via Pictet–Spengler (P–S) reaction by norcoclaurine synthases (NCS) in plants. The synthesis of 1-aryl-tetrahydroisoquinoline alkaloids has attracted increasing attention due to their antitumor and antivirus activities. Herein, the L68T/M97V mutant of NCS from Thalictrum flavum with improved activity was developed by semi-rational design. This mutant not only showed higher catalytic performance (> 96% conversion) toward benzaldehyde and dopamine over the wild-type enzyme, but also catalysed the P–S reaction of the bulky substrate 4-biphenylaldehyde and dopamine with high conversion (> 99%) for the effective synthesis of 1-aryl-THIQA. In terms of stereoselectivity, all products synthesised by the L68T/M97V mutant showed high optical purity (92–99% enantiomeric excess).
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