RESEARCH ON CHEMICAL INTERMEDIATES
·
2022
·Vol. 48
·期 9
·3753-3772
·
IF 3.134
Hou Qingyao,Qin Langlang,Peng Xueer,Zhou Chenyang,Li Xuelian,Zhang Jiandong,Gao Lili
The development of catalysts with high catalytic activity and convenient recycling property is the long-term goal of sulfate-based advanced oxidation processes for the degradation of organic pollutants. In this work, a kind of iron/copper oxide hybrid catalyst (α-Fe 2 O 3 /γ-Fe 2 O 3 /Cu 2 O, CuFe-13) with both higher catalytic performance and paramagnetism was synthesized using a modified method for conventional CuFeO 2 . Through X-ray diffraction and infrared spectra characterization, the catalyst was verified a hybrid of α-Fe 2 O 3 , γ-Fe 2 O 3 and Cu 2 O, in which the exist of magnetic γ-Fe 2 O 3 was the main cause for CuFe-13’s paramagnetism and convenient magnetic recycling property. The mechanism for CuFe-13’s excellent catalytic performance was primarily investigated. Through scanning electron microscope, X-ray photoelectron spectroscopy, N 2 adsorption–desorption measurement, radical quenching experiments, and electron paramagnetic resonance characterization analysis, the CuFe-13 represented larger surface area, bigger porosity, more efficient synergistic effect among Cu, Fe, and O than CuFeO 2. The generation of various of reactive oxygen species (ROS), including sulfate radical ( \({\text{SO}}_{4}^{\cdot - }\) ), hydroxyl radical ( · OH), and singlet oxygen ( 1 O 2 ), especially 1 O 2 were more, which might lead to CuFe-13’s higher catalytic performance. The effects of PMS concentration, CuFe-13 dosage, initial pH, initial OG concentration were analyzed. The optimal removal efficiency of OG could be achieved 100% within 20 min with 1 mM PMS and 0.2 g L −1 CuFe-13 under neutral condition. This study provided an efficient PMS-activated catalyst for degradation of organic pollution.
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 9
·1-10
·
IF 6.408
Yang Xiao-Shuai,Zhao Jie,Wang Lu-Liang,Liu Yu-Shen,Liu Quan-Wen,Peng Xin-Yan,Wang Ping
Covalent organic framework (COF)–decorated magnetic nanoparticles (Fe 3 O 4 @DhaTab) with core–shell structure have been synthesized by one-pot method. The prepared Fe 3 O 4 @DhaTab was well characterized, and parameters of magnetic solid-phase extraction (MSPE) for parabens were also investigated in detail. Under optimized conditions, the adsorbent dosage was only 3 mg and extraction time was 10 min. The developed Fe 3 O 4 @DhaTab-based MSPE-HPLC analysis method offered good linearity (0.01–20 μg mL −1 ) with R 2 (0.999) and low limits of detection (3.3–6.5 μg L −1 ) using UV detector at 254 nm. The proposed method was applied to determine four parabens in environmental water samples with recoveries in the range 64.0–105% and relative standard deviations of 0.16–7.8%. The adsorption mechanism was explored and indicated that porous DhaTab shell provided π-π, hydrophobic, and hydrogen bonding interactions in the MSPE process. The results revealed the potential of magnetic-functionalized COFs in determination of environmental contaminants. Graphical abstract
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Biomass Conversion and Biorefinery
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2022
·
IF 4.05
Wang Yun,Dong Kai-hui,Zhen Miao-lan,He Jia-Rui,Yao Qiao-xia
The Knoevenagel condensation of aromatic aldehydes and ethyl acetoacetate catalyzed by L-proline in water, ionic liquid, and deep eutectic solvents (DESs), respectively, was studied. The mild reaction conditions, enhanced rates, improved yields, and reagents’ reactivity are observed in deep eutectic solvents. The highest yields are up to 94.4%. The Z/E selectivity of products is up to 3.21. In addition, the influencing factors of product configuration were studied by calculation and experiment.
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Journal of Bionic Engineering
·
2022
·Vol. 19
·期 6
·1645-1657
·
IF 2.995
Liu Chang,Deng Dan,Gao Jing,Jin Shue,Zuo Yi,Li Yubao,Li Jidong
The ideal Guided Bone Regeneration (GBR) membrane is required to have good biocompatibility, space maintenance ability, appropriate degradation rate, and preferably can guide the regeneration of vascularized bone tissue. In this study, Simvastatin (SIM) and calcium Phosphate (CaP) were encapsulated in a Polycaprolactone (PCL)/Chitosan (CS) core–shell structural fibrous membranes via coaxial electrospinning technology. The results showed that loaded SIM in the core of the core–shell structure fibrous membranes could sustainably release the drug for more than two months and upregulate the angiogenic marker of Bone Mesenchymal Stem Cells (BMSCs). Adding a certain amount of CaP to the shell layer provided more sites for the mineralization and synergistic with SIM to promote osteogenic differentiation of BMSCs in vitro. The intramuscular implantation experiments in rabbits suggested a normal early inflammation and enhanced vascularization induced by the SIM-loaded fibrous membranes. This study proposed an effective strategy to prepare a dual-loaded core–shell fibrous membrane for guided vascularized bone tissue regeneration.
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JOURNAL OF POROUS MATERIALS
·
2022
·Vol. 30
·期 1
·23-32
·
IF 2.523
Tian Rui,Wang Junzhang,Xu Zhou,Guo Xingzhong,Lei Wei,Ding Ronghua,Zhang Yun,Yang Hui
Silicon-based anodes are promising for high-energy density lithium-ion batteries (LIBs), while they are extremely constrained by serious volume expanding. Silicon oxycarbides (SiOC) can deliver milder volume change and acceptable theoretical capacity, but the electrochemical performance of most pure SiOC anodes is still limited by their volume expanding and poor electronic conductivity. Herein, a high-performance SiOC anode with bi-continuous macropores and robust skeletons derived from polyorganosiloxane aerogels was fabricated through a sol–gel method. The resultant SiOC material comprises free carbon phase, SiO 4 , SiO 3 C and SiO 2 C 2 units. The specific capacity of bi-continuous macroporous SiOC anode can achieve 680 mAh g −1 after 350 cycles, possessing high reversibility and stability. The synergetic effect of robust skeletons, bi-continuous macropores, appropriate constitution of free carbon phase, SiO 4 and SiO 3 C units endows the synthesized macroporous SiOC materials with such superior specific capacity and stable cycling performance. The bi-continuous macroporous SiOC with robust skeletons can provide a promising fundamental material to further achieve long-cycle SiOC anode materials.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2022
·Vol. 414
·期 23
·6791-6800
·
IF 4.478
Zhou Zhen-Fan,Feng Xiao-Zhen,Zhan Tao,Han Guo-Cheng,Chen Zhencheng,Kraatz Heinz-Bernhard
Folic acid (FA) is essential for human health, particularly for pregnant women and infants. In this work, a glassy carbon electrode (GCE) was modified by a bimetallic layer of Cu/Co nanoparticles (CuNPs/CoNPs) as a synergistic amplification element by simple step-by-step electrodeposition, and was used for sensitive detection of FA. The proposed CuNPs/CoNPs/GCE sensor was characterized by differential pulse voltammetry (DPV), electrochemical impedance spectroscopy (EIS) and field emission scanning electron microscopy (FESEM). Then, under optimal conditions, a linear relationship was obtained in the wide range of 110.00–1750.00 μM for the detection of FA with a limit of detection (LOD) of 34.79 μM ( S/N = 3). The sensitivity was calculated as 0.096 μA μM −1 cm −2 . Some interfering compounds including glucose (Glc), biotin, dopamine (DA), and glutamic acid (Glu) showed little effect on the detection of FA by amperometry ( i-t ). Finally, the average recovery obtained was in a range of 91.77–110.06%, with a relative standard deviation (RSD) less than 8.00% in FA tablets, indicating that the proposed sensor can accurately and effectively detect the FA content in FA tablets.
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Heritage Science
·
2022
·Vol. 10
·期 1
·1-12
·
IF 2.843
Zhou Sheng,Zhao Zongshen,Mao Heyi,Wang Lei,Chen Junyin,Chen Jiachang,Huang Xia
Bronze has been used for various applications since ancient times, and therefore, its preservation is critical. However, preserving bronze is challenging. The traditional inhibitor sealing method is limited by its toxicity and sealing effects. In this study, a benzotriazole (BTA) inhibitor loaded with a composite hydrogel of sodium alginate and cyclic-peptide-grafted β-cyclodextrin was prepared. The chemical structure of the components of the composite hydrogel coating was characterized through Fourier-transform infrared spectroscopy. The microstructure of the coating on bronzeware was characterized through scanning electronic microscopy. The thermal analysis of the composite hydrogel coating confirmed that BTA was introduced successfully into the composite hydrogel, and the coating exhibited the liquid crystalline property because of the mesogenic unit—cyclic peptide. Electrochemical impedance spectroscopy revealed that the modified β-cyclodextrin-loaded benzotriazole considerably improved the corrosion resistance. In a certain range, the higher was the BTA-loaded Cyc-g-β-CD ratio, the stronger was the protective effect of the gel coating. In conclusion, corrosion inhibitors can considerably improve the corrosion resistance of gel coatings.
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 28
·13632-13646
·
IF 4.682
Zhu Wenhao,Wu Zhenxu,Wang Peng,Liu Tianyi,Guo Min,Ji Jiansong,He Mingfeng,Wang Haifeng,Zhang Peibiao
Within brain tissue engineering, stem cell implantation assisted by biodegradable injectable scaffolds is a crucial method. However, implanted scaffolds, especially microcarriers, may translocate due to the fluidity of the materials. Therefore, the development of an MRI contrast enhancement microcarrier, which could noninvasively trace the location of the implant in vivo, is necessary to guide the evaluation of treatment prognosis. In this study, GdPO 4 ·H 2 O nanoparticles were utilized as the dispersed phase to endow PLGA microcarriers with T1-weighted MRI contrast ability. By adjusting the dispersed phase of Gd compound nanoparticle in PLGA Matrix, a cross-comparison experiment between MRI contrast enhancement imaging and biocompatibility was conducted, and 0.8% Gd was found to be the most suitable rate for preparing nano-composites. Moreover, 0.8% Gd/PLGA microcarriers were suspension-cultured with stem cells in vitro and implanted into traumatic brain injury rats in vivo. Excellent cytocompatibility and enhancement of the T1 phase of MRI were confirmed. This work created a T1-weighted MRI contrast-enhanced microcarrier, which provides a clinical noninvasive tracing cell scaffold for brain tissue engineering.
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Journal of Analysis and Testing
·
2022
·Vol. 6
·期 2
·120-128
·
IF 0
Jing Le,Xie Chong-Yu,Li Qian-Qian,Yao Hui-Fang,Yang Mei-Qing,Li Hui,Xia Fan,Li Shao-Guang
The sandwich-type lateral flow assays relying on dual aptamers with high sensitivity and specificity have been broadly explored. However, it is unlikely to match a pair of specific aptamers that can bind a small molecular target (e.g., cocaine) simultaneously due to the steric hindrance. In response, we herein introduced the strategy of “one divides into two” into the construction of sandwich-type lateral flow strip assay (LFSA). Specifically, we split a single cocaine-recognizing aptamer into two segments, either of which was conjugated with gold nanoparticles (AuNPs) or labeled with biotin, serving as signal probe and capture probe, respectively. Upon the presence of the target molecule, a ternary sandwich complex comprised of the two halves of the aptamer and the target formed. Such sandwich-type LFSA exhibited an excellent nonlinear logarithmic response in the range from 10 μmol/L to 5 mmol/L with R 2 = 0.9994. The sensitive on-site detection of cocaine in artificial biological samples including urine and sweat was achieved within 15 min, with the visual limit of detection as low as 50 μmol/L for urine and 200 μmol/L for sweat, and the recovery rates of 83.6–107.4%.
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JOURNAL OF PLANT GROWTH REGULATION
·
2022
·Vol. 42
·期 3
·1937-1952
·
IF 4.64
Cheng Siren,Fang Zhenming,Cheng Xianchao,Wu Yizhu,Mo Lifang,Yan Chongyang,Zhou Langshan,Ren Yong
Despite copper (Cu) being an essential nutrient for the growth and development of all living organisms, the yield and tolerance mechanisms of fragrant rice under Cu-induced stress have not been reported. In this study, we tested two fragrant rice cultivars (Meixiangzhan and Yuxiangyouzhan) at the heading stage, with four Cu doses (CuSO 4 ·5H 2 O), i.e., 0 (CK), 20 (T1), 40 (T2), and 60 mM (T3) in a pot experiment. Our results showed that T2 treatment improved the yield of Meixiangzhan and Yuxiangyouzhan by 8.33% and 18.51%, respectively, by improving grains per panicle and the seed-setting rate. Moreover, Yuxiangyouzhan had the highest yield in T2 treatment, indicating that it had better Cu-tolerance than Meixiangzhan. Both cultivars had a similar response to Cu dose treatments. While T1 and T2 improved leaf pigment contents, antioxidant enzyme activities, and soluble protein content in plant tissues, T3 treatment instead promoted higher malondialdehyde (MDA) content accumulation and regulated antioxidant attributes. Overall, low-level Cu dosing significantly improved the fragrant rice yield via modulation of the antioxidant attributes. Therefore, this study provides supporting evidence for utilizing Cu reagent or assessing Cu toxicity in fragrant rice.
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 4
·1-11
·
IF 6.408
Sha Qiuyue,Fei Jian,Tu Chang,Liu Bi-Feng,Hu Zhaoyu,Liu Xin
Glyconanoparticles (G-NPs), biofunctional nanomaterials that can fully combine the unique properties of nanoparticles (NPs) with the bioactivities of carbohydrates, have become an appealing nanoplatform in analytical chemistry and biomedical research. However, there is currently a lack of an efficient and universal method for facile immobilization of reducing carbohydrates on NPs while maintaining their structure integrity, greatly limiting the preparation and application of G-NPs. Herein, a new and universal strategy for preparing carbohydrate-functionalized gold nanoclusters (Au NCs) was developed by using S-(3-(methoxyamino)propyl) thioacetate (MPTA) as a new bifunctional linker. MPTA with an N-methoxyamine group (-NHOMe) and a thioacetyl group (-SAc) was synthesized by a two-step strategy and then grafted onto Au NCs by an efficient click reaction. Subsequently, reducing carbohydrates could be readily immobilized onto MPTA-functionalized Au NCs (MPTA-Au NCs) by a reducing end ring-closure reaction under mild conditions. The obtained G-NPs showed average size of 1.9 ± 0.42 nm and strong fluorescence at 610 nm. Carbohydrates grafted on G-NPs still retained their structure integrity and specific recognition ability toward their receptor proteins. Notably, the affinity between G-NPs and proteins was increased by 1300 times compared with free carbohydrates with an association constant of (1.47 ± 0.356) × 10 6 M −1 . The prepared fluorescent G-NPs were also successfully applied to lectin sensing and targeted breast cancer cell imaging with good performance. These results indicated that the intact immobilization of reducing carbohydrates (whether naturally or chemically accessed) on NPs could be easily achieved using MPTA, providing a simple, efficient, and universal strategy for G-NP preparation. Graphical abstract
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 4
·1-5
·
IF 6.408
Tian Dazhi,Xiang Wen,Wang Hao,Jiang Wentao,Li Ting,Yang Minghui
B-doped core–shell Fe@BC nanozyme was synthesized. The peroxidase (POD) like activity of Fe@BC nanozyme was studied and utilized for detecting the activity of alanine aminotransferase (ALT). In the presence of ALT as well as ALT co-substrates l -alanine and α-ketoglutarate, l -glutamate is generated. The following catalytic oxidation of l -glutamate by glutamate oxidase leads to the generation of H 2 O 2 . The POD-like activity of Fe@BC can oxidize 3,3′,5,5′-tetramethylbenzidine (TMB) to oxTMB in the presence of H 2 O 2 , generating a blue-colored compound. Through the detection of the amount of H 2 O 2 generated, ALT activity can be determined through measuring the absorbance intensity variation at 450 nm. The limit of detection of the assay is 4 U/L, with a linear range from 10 to 1000 U/L. For human serum samples, the ALT levels determined by our assay are comparable to those determined by the hospital with a correlation coefficient of 0.991, demonstrating the reliability of our assay results. Graphical abstract
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