BIOTECHNOLOGY LETTERS
·
2023
·Vol. 45
·期 10
·1355-1364
·
IF 2.7
Gao Yahui,Li Fen,Wang Yulu,Chen Zhou,Li Zijie
Purpose In our previous study, we constructed a one-pot multi-enzyme system for rare ketoses synthesis based on L-rhamnulose-1-phosphate aldolase (RhaD) from accessible glycerol in vitro. To eliminate tedious purification of enzymes, a facile Escherichia coli whole-cell cascade platform was established in this study. Methods To enhance the conversion rate, the reaction conditions, substrate concentrations and expressions of related enzymes were extensively optimized. Results The biosynthetic route for the cascade synthesis of rare ketoses in whole cells was successfully constructed and three rare ketoses including D-allulose, D-sorbose and L-fructose were produced using glycerol and D/L-glyceraldehyde (GA). Under optimized conditions, the conversion rates of rare ketoses were 85.0% and 93.0% using D-GA and L-GA as the receptor, respectively. Furthermore, alditol oxidase (AldO) was introduced to the whole-cell system to generate D-GA from glycerol, and the total production yield of D-sorbose and D-allulose was 8.2 g l −1 only from the sole carbon source glycerol. Conclusion This study demonstrates a feasible and cost-efficient method for rare sugars synthesis and can also be applied to the green synthesis of other value-added chemicals from glycerol.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 9
·14239-14253
·
IF 0
Zheng Yixun,Xiao Zhenjun,Lin Yijie,Fang Zheng,Liu Deyang,Lin Zifeng,Zhang Qianxin,Chen Ping,Zhang Zhenheng,Xv Lu,Lv Wenying,Liu Guoguang
In response to antibiotic residues in the water, a novel advanced oxidation technology based on MgO 2 was used to remediate sulfamethazine (SMTZ) pollution in aquatic environments. Upon appropriate regulation, the remarkable removal efficiency of SMTZ was observed in a UV/MgO 2 system, and the pseudo-first-order reaction constant reached 0.4074 min −1 . In addition, the better performance of the UV/MgO 2 system in a weak acid environment was discovered. During the removal of SMTZ, the pathways of SMTZ degradation were deduced, including nitration, ring opening, and group loss. In the mineralization exploration, the further removal of residual products of SMTZ by the UV/MgO 2 system was visually demonstrated. The qualitative and quantitative researches as well as the roles of reactive species were valuated, which revealed the important role of ·O 2 − . Common co-existing substances in actual wastewater such as NO 3 − HA, Cl − , Fe 2+ , Co 2+ , and Mn 2+ can slightly inhibit the degradation of SMTZ in the UV/MgO 2 system. Finally, the capacity of efficient degradation of SMTZ in actual wastewater by the UV/MgO 2 system was proved. The results indicated that the innovative UV/MgO 2 system was of great practical application prospect in antibiotic residue wastewater remediation.
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PubMed
JOURNAL OF ELECTRONIC MATERIALS
·
2024
·Vol. 53
·期 5
·2514-2523
·
IF 2.2
Zhou Wei,Yang Jian,Jin Xiangliang
Upconversion (UC) nanomaterials are of interest to researchers because of their excellent photostability, effective quantum efficiency and optical temperature dependence. However, most UC nanomaterials are thermally quenched, which causes optical nanothermometers to be susceptible to their own thermal effects, reducing the accuracy of temperature measurements. In this paper, NaYF 4 :Yb 3+ /Ho 3+ /Tm 3+ /Gd 3+ nanorods with UC luminescence and resistance to thermal quenching are prepared through a simple hydrothermal method. The UC luminescence intensity of NaYF 4 :Yb 3+ /Ho 3+ /Tm 3+ /Gd 3+ nanorods is adjusted by doping with Tm 3+ ions. The luminescence intensity at each location shows different temperature dependence as the temperature increases. When the temperature reaches 573 K, the integrated luminescence intensity is three times that at 293 K. At the same time, the intensity at all temperature points in the range of 293–573 K is greater than the intensity at 293 K, which shows that the nanorods have excellent resistance to thermal quenching. In addition, the relative sensitivity ( S r ) of LIR( I 696 / I 476 ), LIR( I 696 / I 541 ), LIR( I 696 /I 646 ), LIR( I 696 / I 802 ), and LIR( I 541 / I 476 ) is investigated based on the luminescence intensity ratio (LIR) technique. The S r of LIR( I 696 / I 802 ) is found to have larger values in the low-temperature range, while S r of LIR( I 696 / I 476 ) has larger values in the high-temperature range. The use of LIR( I 696 / I 802 ) and LIR( I 696 / I 476 ) in separate temperature bands allows S r to reach 0.93–1.67 %K −1 in the range of 293–573 K, confirming that the nanorods have high S r over a wide temperature interval. This study indicates that the NaYF 4 :Yb 3+ /Ho 3+ /Tm 3+ /Gd 3+ nanorods are promising candidates for optical thermometers with high sensitivity, wide temperature range, and resistance to thermal quenching.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 14
·21430-21441
·
IF 0
Jiang Changjin,Zhang Shuang,Zhang Ting
Fe 3+ complexed with 3-aminopropyltriethoxysilane (APTES)-modified carboxymethyl chitosan (CMC) named Fe-ACMC was synthesized by a one-step method at room temperature and pressure. The surface morphology and chemical structure of Fe-ACMC were characterized by SEM-EDS, XRD, BET, FT-IR, XPS, and ζ-potential. In batch adsorption, the optimum pH for arsenate [As(V)] adsorption onto Fe-ACMC was 3–9 with removal efficiency > 99%. The adsorption of As(V) could reach equilibrium within 25 min and the maximum adsorption capacity was 84.18 mg g –1 . The pseudo-second-order model fitted well the kinetic data ( R 2 = 0.995), while the Freundlich model well described the adsorption isotherm of As(V) on Fe-ACMC ( R 2 = 0.979). The co-existing anions (NO 3 – , CO 3 2– , and SO 4 2– ) exhibited a slight impact on the As(V) adsorption efficiency, whereas PO 4 3– inhibited As(V) adsorption on Fe-ACMC. The real applicability of Fe-ACMC was achieved to remove ca. 10.0 mg L –1 of As(V) from natural waters to below 0.05 mg L –1 . The regeneration and reuse of Fe-ACMC for As(V) adsorption were achieved by adding 0.2 mol L –1 HCl. The main adsorption mechanism of As(V) on Fe-ACMC was attributed to electrostatic attraction and inner-sphere complexation between –NH 2 ···Fe 3+ and As(V). In fixed-bed column adsorption, the Thomas model was the most suitable model to elucidate the dynamic adsorption behavior of As(V). The loading capacity of the Fe-ACMC packed column for As(V) was 47.04 mg g –1 at pH 7 with an initial concentration of 60 mg L –1 , flow rate of 3 mL min –1 , and bed height of 0.6 cm. Graphical abstract
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PubMed
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 3
·1-11
·
IF 5.3
Li Qianji,Fan Pengfei,Hao Zejia,Ni Shanhong,Wu Qian,Li Lei
An innovative synthesis of boron and nitrogen co-doped ceria-based nanoparticles (B/N-CeFNPs) with bright blue fluorescence emission is reported using the hydrothermal method. Based on the aggregation-induced emission enhancement (AIEE) effect between B/N-CeFNPs and chlortetracycline (CTC), a rapid detection method for CTC through fluorescence enhancement was developed. In addition, through the electron transfer process (ET), fluorescence resonance energy transfer (FRET) effect and static quenching between B/N-CeFNPs and oxytetracycline (OTC), a ratio fluorescence strategy for detecting OTC was generated. The fluorescence of B/N-CeFNPs at 410 nm can be effectively quenched by OTC, and new fluorescence emission appears at a wavelength of 500 nm. B/N-CeFNPs showed good linear responses with CTC and OTC in the range 0.1-1 µM and 1-40 µM, respectively. This system was used to simultaneously detect the CTC and OTC in milk and honey, realizing multi-residues detection of TCs in actual samples by using the same ceria-based fluorescence nanomaterial. Graphical abstract
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 36
·1-9
·
IF 2.8
Fu Jinxin,Zhou Changrong,Chen Jun,Yu Dongyan,Wu Di,Li Qingning,Yuan Changlai,Xu Jiwen,Rao Guanghui
The incompatibility of the large piezoelectric response ( d 33 ) and high depolarization temperature ( T d ) in lead-free piezoelectric ceramics limited their practical applications. The most used modification methods for improving d 33 or T d commonly required a delicate control of complex compositions. Here, a strategy for simply changing the sintering temperature is used to defer the T d and increase d 33 simultaneously. The T d and d 33 of unmodified Bi 0.5 Na 0.5 TiO 3 -0.2Bi 0.5 K 0.5 TiO 3 (BNKT20) ceramics increase with increasing sintering temperature until both of them reach the maximum ( d 33 ~ 174pC/N, T d ~ 177 °C) at the sintering temperature of 1100 °C. In-depth analysis unveils the critical role of multiphase coexistence and oxygen vacancies in enhancing T d by optimizing sintering temperature. Meanwhile, increasing sintering temperature promotes large grain size with easy domain orientation, thus, yielding the improved d 33 . This work provides a simple and effective method to broaden the working range of Bi 0.5 Na 0.5 TiO 3 -based (BNT) piezoelectric ceramics at high temperature under the premise of realizing high piezoelectric properties.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 9
·5946-5954
·
IF 2.1
Lu Yuting,Bian Zhenglan,Chu Fenghong,Lu Jianwei,Hou Guoqiang,Hou Shili
In this paper, a hydrothermal strategy is reported for the synthesis of nitrogen-doped carbon dots (NCD) which used citric acid (CA) and urea as reactants with different pristine molar ratios of carbon/nitrogen atoms (C/N). The fluorescence emission wavelength of the aqueous solutions of NCD can be tuned from 462 to 546 nm under a single and uniform UV light excitation (365 nm). Through many characterization analysis methods, it is demonstrated that graphitic N and C=O extended the effective conjugation length which reduced the energy gap between the highest occupied molecular orbital (HUMO) and the lowest unoccupied molecular orbital (LUMO). This is considered to be responsible for the redshift and tunability of the fluorescence emission of NCDs with different C/N molar ratios. This will be useful for designing a synthetic strategy of long-wavelength fluorescence emission carbon dots (CDs) in a non-benzene ring precursor system. As a potential fluorescence sensor, the as-prepared NCDs can specifically detect Fe 3+ ions and Al 3+ ions in aqueous solutions. Additionally, the NCDs not only are nontoxic but also exhibit large and stable fluorescence intensity, indicating that they have broad potential application in the fields of sensors and optoelectronic devices.
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高影响因子
Journal of Mechanical Science and Technology
·
2024
·Vol. 38
·期 3
·1601-1611
·
IF 1.5
Tang Qianqian,Xiong Ran,Zhang Nana,Zhang Nan,Liu Xiaoli,Lv Yi,Wu Rongqian
In this study, glucose oxidase (GOD) was fixed on ferrimagnetic vortex-domain iron oxide nanorings (FVIOs) using the covalent bond crosslinking method to create FVIOs-GOD compounds. The activity of surface-conjugated enzymes can be effectively and selectively enhanced by utilizing FVIOs to induce magnetothermal effects under the influence of alternating magnetic fields. GOD can further catalyze the oxidation of glucose to hydrogen peroxide (H 2 O 2 ), which possesses bactericidal properties. This study presents a comprehensive technique for controlling the activity of enzymes by nano-magnetothermal stimulation, which was utilized in Escherichia coli antibacterial studies. In comparison to the control group, the enzyme activity of the FVIOs-GOD immobilized enzymes rose by 50 % due to the nano-magnetothermal stimulation, and the enzyme activity could be controlled by varying the magnetic field intensity. The antibacterial experiments indicated that the survival rate of Escherichia coli decreased by 55 % after exposure to a magnetic field.
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高影响因子
Frontiers of Materials Science
·
2025
·Vol. 19
·期 1
·1-13
·
IF 2.3
Zhao Jingkun,Yao Shuaikang,Huang Yingjie,Gao Siyu,Zhai Shangru,An Qingda,Xiao Zuoyi,Zhang Feng
It is undoubtedly a challenge to design an efficient and recyclable photocatalyst for the degradation of tetracycline (TC). In this study, a MoS 2 @C composite catalyst was fabricated through the simple sulfurization of alginate-based spheres encapsulating ammonium molybdate by thiourea. The incorporation of porous carbon as a co-catalyst significantly augmented reactive active sites, endowing it with great specific surface area and effectively preventing the aggregation of MoS 2 nanoparticles. While offering abundant catalytic sites for the reaction, the structure with interconnected channels promoted the adsorption of the reactant. The MoS 2 @C composites showed excellent photocatalytic performance, achieving a photodegradation ratio of 87.01% for TC within 60 min, superior to that of pure MoS 2 . Additionally, the photocatalytic mechanism for the degradation of TC was also investigated through free radical trapping experiments in combination with the electron spin resonance technique.
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高影响因子
Frontiers of Chemical Science and Engineering
·
2025
·Vol. 19
·期 4
·1-12
·
IF 4.5
Xing Xiangwen,Jiang Jingxuan,Liu Jing,Zhao Pei,Cui Lin,Dong Yong
The sodium persulfate (Na 2 S 2 O 8 )-urea system has been proven to be an excellent scrubbing solution for the wet removal of NO. Commonly, seawater is used as a wet carrier in marine applications. To further explore the feasibility of marine denitrification using Na 2 S 2 O 8 -urea system, this study proposed the Na 2 S 2 O 8 -urea-seawater composite redox system for NO removal from the marine exhaust gas. The effects of seawater carrier, reaction temperature, Na 2 S 2 O 8 concentration, urea concentration, pH value, and NO concentration on NO removal were investigated. Additionally, the NO 3 − concentration in the solution was measured. Results showed that the lowest normalized NO concentration was 0.099, with the corresponding mass of NO absorbed per unit volume of solution reaching 0.108 g·L −1 . The addition of seawater carrier and incremental reaction temperature, Na 2 S 2 O 8 , and urea concentration promoted the NO removal performance. When the pH value increased within the range of 4–7, the NO removal performance decreased. The NO removal performance increased as the pH value further increased to 8, but decreased again when the pH value increased to 11. An increase in NO concentration was detrimental to NO removal. The Cl − , HCO 3 − , and CO 3 2− in seawater could augment the total concentration of active free radicals to improve denitrification performance.
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高影响因子
EUROPEAN JOURNAL OF MEDICAL RESEARCH
·
2024
·Vol. 29
·期 1
·1-11
·
IF 2.8
Armaghan Muhammad,Khan Khushbukhat,Irfan Muhammad,Hafeez Amna,Zafar Sameen,Javed Zeeshan,Sharifi-Rad Javad,Butnariu Monica,Sarac Ioan,Bagiu Iulia-Cristina,Bagiu Radu Vasile
Scientists have been compelled to search for alternative treatments due to the increasing prevalence of chemoresistance as well as the agonising and distressing side effects of both chemotherapy and radiation. Plant extracts have been exploited to treat various medical conditions for ages. Considering this fact, the main focus of various recent studies that are being conducted to find new and potent anticancer drugs involves the identification and utilisation of potential therapeutic chemicals present in plant extracts. Koetjapic acid (KJA), which belongs to the family of triterpenes, is primarily isolated from Sandoricum koetjape . Ongoing investigations into its therapeutic applications have revealed its tendency to impede the growth and proliferation of cancer cells. Koetjapic acid activates the intrinsic apoptotic pathway and promotes the death of cancer cells. Moreover, it inhibits angiogenesis and the dissemination of tumour (metastasis) by targeting the VEGF signalling cascade. Therefore, this study aims to elucidate the underlying mechanism of anticancer activity of koetjapic acid, providing significant insight into the compound’s potential as an anticancer agent.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2011
·Vol. 47
·期 2
·711-719
·
IF 1.859
Jin Quan,Zheng Mingtao,Wu Yongjian,Xie Chunlin,Xiao Yong,Liu Yingliang
A facile approach was developed for synthesis of carbon hollow microspheres (CHM) via carbonization of the hollow polymer microspheres prepared from polymerization in the presence of l -lysine acted as in situ template. The physical and chemical structures of the samples were investigated by X-ray powder diffraction, Raman spectrum, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). SEM and TEM images show that the products consist of a large scale of monodisperse CHM with a size of about 1.1–1.3 μm. Furthermore, the resulting CHMs possess a surface area of 559 m 2 g −1 and a pore volume of 0.27 cm 3 g −1 . The morphology and the size of the as-obtained samples can be controlled by the polymerization temperature, polymerization time, and the dosage of l -lysine. Moreover, a possible formation mechanism of the CHM has been put forward according to the experimental data available.
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高影响因子
危险品化学品经营许可证（带存储）