Food Analytical Methods
·
2023
·Vol. 16
·期 4
·709-720
·
IF 2.9
Zhou Binbin,Sheng Xingxin,Xie Hao,Zhou Sisi,Huang Lijun,Zhang Zuokun,Zhu Yongbo,Zhong Ming
Nitrofurazone (NF) is a kind of synthetic antibiotic with teratogenic and carcinogenic properties, which is often residual in animal food, so it is of great significance to detect it with high selectivity and rapid. In this study, a molecularly imprinted electrochemical sensor was constructed by electropolymerization for the high-specificity, high sensitivity,and rapid detection of NF in milk. By sequentially modifying reduced graphene oxide (RGO) and gold nanoparticles (AuNPs) on the glassy carbon electrode, the effective surface area and electron transfer ability of the electrode are improved, the double amplification of the electrical signal is realized, and the sensitivity and stability of the sensor are improved. A molecularly imprinted polymer (MIP) is polymerized on the surface of the modified electrode by using NF as a target molecule and o -phenylenediamine ( o –PD) as a functional monomer to improve the specific detection ability of the sensor for NF. The experimental conditions (the number of turns of depositing RGO, the thickness of the MIP, the elution time, and the adsorption time) were optimized to attain the best detection performance of the sensor. Differential pulse voltammetry (DPV) was used to detect NF by redox probe ([Fe(CN) 6 ] 3−/4− ). The constructed sensor exhibited an admirable linear relationship between 5 and 1000 nmol L −1 ( R 2 = 0.9968) and the detection limit was 0.18 nmol L −1 (S/N = 3). Compared to the non-imprinted sensor, the imprinting factor was found to be 3.09. In addition, the sensor also showed excellent repeatability (RSD = 1.17%) and stability, and also showed a good recovery rate in actual sample detection (99.06–101.46%), which is expected to be applied to the detection of other harmful substances in food.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-12
·
IF 16.6
Sun FuYao,Liu LongFei,Liu Tong,Wang XueBin,Qi Qi,Hang ZuSheng,Chen Kai,Xu JianHua,Fu JiaJun
Catastrophically mechanical failure of soft self-healing materials is unavoidable due to their inherently poor resistance to crack propagation. Here, with a model system, i.e., soft self-healing polyurea, we present a biomimetic strategy of surpassing trade-off between soft self-healing and high fracture toughness, enabling the conversion of soft and weak into soft yet tough self-healing material. Such an achievement is inspired by vascular smooth muscles, where core-shell structured Galinstan micro-droplets are introduced through molecularly interfacial metal-coordinated assembly, resulting in an increased crack-resistant strain and fracture toughness of 12.2 and 34.9 times without sacrificing softness. The obtained fracture toughness is up to 111.16 ± 8.76 kJ/m 2 , even higher than that of Al and Zn alloys. Moreover, the resultant composite delivers fast self-healing kinetics (1 min) upon local near-infrared irradiation, and possesses ultra-high dielectric constants (~14.57), thus being able to be fabricated into sensitive and self-healing capacitive strain-sensors tolerant towards cracks potentially evolved in service.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 14
·40534-40550
·
IF 5.8
Fang Lei,Wu Guojian,Yao Keyu,Zhang Dongyang,Zhou Yongchao
A novel heterogeneous catalyst named MoS 2 /MIL-53(Fe, Cu) (MMFC) was prepared by hydrothermal method and applied in a heterogeneous electro-Fenton (hetero-EF) system for lomefloxacin (LOM) degradation in this work. Under the optimal conditions of current density 3 mA/cm 2 , catalyst dosage 0.100 g/L, and initial pH 6, 93.5% LOM (2 mg/L) removal efficiency was achieved in the MMFC hetero-EF system within 60 min, indicating an obvious improvement compared with the MIL-53(Fe, Cu) hetero-EF system. The good catalytic activity was attributed to more effective active sites of the catalyst and the conversion of Fe(II)/Fe(III) and Cu(I)/Cu(II) promoted by Mo(IV) in MoS 2 , which could be inferred by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) characterizations. The reusability and stability of MMFC were explored based on five cyclic experiments, and the average degradation efficiency reached 73.9%. Furthermore, the hetero-EF system could achieve the total removal of moxifloxacin and tetracycline within 6 min and 40 min, respectively. Quenching experiments revealed that the hydroxyl radicals (·OH) were the main reactive radicals while superoxide radicals (·O 2 − ) and singlet oxygen ( 1 O 2 ) played a certain part in LOM degradation. Finally, the possible mechanism of the hetero-EF process and LOM degradation pathways were proposed, including substitution, elimination, and cleavage of ring structures. Accounting for good catalytic performance, low preparation cost, and satisfactory versatility, the MMFC exhibited good potential to work as a hetero-EF catalyst for wastewater treatment.
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AMINO ACIDS
·
2023
·Vol. 55
·期 4
·499-507
·
IF 3.5
Qin Tiansheng,Huang Xiande,Zhang Qianqian,Chen Fan,Zhu Jiaojiao,Ding Yaoyao
During trauma and surgery, bleeding is a major concern. One of the crucial strategies for hemostasis is the use of biological hemostatic material. Herein, we reported an amino acid-based hydrogel FmocF-ADP hydrogel, which consisted of N-[(9H-fluoren-9-ylmethoxy) carbonyl]-3-phenyl-L-alanine (FmocF) and adenosine diphosphate (ADP) sodium solution. The hydrogel was created by FmocF self-assembling to nanofiber in ADP sodium solution and then cross-linking to hydrogel. FmocF-ADP hydrogel showed good in vitro coagulation activity as measured by whole blood clotting assays, platelet clotting assays, platelet activation assays, and platelet adhesion assays. Further, it was noted to reveal an exceptional in vivo hemostatic effect in a mouse liver bleeding model. Together with the previous report of the good biocompatibility and antimicrobial activity of FmocF hydrogel, our study would extend the biomedical application of FmocF hydrogel. In conclusion, the present study would provide a constructive strategy for the development of new antimicrobial and hemostatic materials or develop a potential hemostatic material.
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RARE METALS
·
2023
·Vol. 42
·期 4
·1261-1273
·
IF 8.8
Li Yang,Tang Ming-Yang,Zhang Zhong-Gang,Li Qi,Li Jing-Lei,Xu Zhuo,Liu Gang,Li Fei
BaTiO 3 ceramics are difficult to withstand high electric fields, so the energy storage density is relatively low, inhabiting their applications for miniaturized and lightweight power electronic devices. To address this issue, we added Sr 0.7 Bi 0.2 TiO 3 (SBT) into BaTiO 3 (BT) to destroy the long-range ferroelectric domains. Ca 2+ was introduced into BT-SBT in the form of CaTiO 3 (CT), which has the effect of inhibiting the movement of A-site defects to reduce dielectric loss and refining the grains to increase the breakdown field strength. In addition, we have increased the density and grain uniformity of ceramics by repeated rolling of the green samples through the viscous polymer processing (VPP), to further increase the breakdown electric field. The BT-SBT-CT ceramics exhibit the high recoverable energy storage density of 4.0 J·cm −3 under electric field of 480 kV·cm −1 . Its recoverable energy storage density varies by less than 8% in the temperature range of 30–150 °C, indicating good temperature stability of the energy storage performance. In this work, the energy storage performance of barium titanate-based ceramics was greatly improved by transforming ferroelectrics into relaxor ferroelectrics and VPP method, which can bring new inspiration for the research of energy storage ceramics. Graphical abstract
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Biomass Conversion and Biorefinery
·
2023
·
IF 4
Wen Yao,Zeng Xiang,Tan Hongyu,Liu Bing
To research the optimization of ultrasonic-assisted extraction of total flavonoids from Cortex Lycii and its biological activities. Box-Behnken design experiment was used to optimize the extraction process, and AB-8 macroporous resin was used for purification. Its biological activities were studied by the inhibition rate of α -glucosidase and α - amylase and the scavenging rate of DPPH and ABTS. The optimal extraction parameters of total flavonoids from Cortex Lycii were as follows: the extraction temperature was 63 ℃, the ethanol volume fraction was 71%, the solid–liquid ratio was 28 mL/g, the extraction time was 61 min. Under this optimal condition, the yield of total flavonoids was 1.674 mg/g, which was consistent with the predicted value of 1.637 mg/g, and was 5.85 times higher than that of the traditional water extraction method. The inhibitory rate (IC 50 ) of total flavonoids extract from Cortex Lycii on α -glucosidase was 3 μg/mL and on α -amylase was 5 μg/mL. The scavenging rate (IC 50 ) of DPPH radical was 0.648 mg/mL and the scavenging rate (IC 50 ) of ABTS radical IC 50 was 0.012 mg/mL. The optimized extraction process with response surface design was reliable, which could be used for the extraction of total flavonoids from Cortex Lycii . It has strong hypoglycemic and antioxidant activities and has a good prospect for future utilization and development.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-10
·
IF 16.6
Sun Yuxuan,Wang Liu,Ni Yangyang,Zhang Huajian,Cui Xiang,Li Jiahao,Zhu Yinbo,Liu Ji,Zhang Shiwu,Chen Yong,Li Mujun
Thermosets such as silicone are ubiquitous. However, existing manufacturing of thermosets involves either a prolonged manufacturing cycle (e.g., reaction injection molding), low geometric complexity (e.g., casting), or limited processable materials (e.g., frontal polymerization). Here, we report an in situ dual heating (ISDH) strategy for the rapid 3D printing of thermosets with complex structures and diverse rheological properties by incorporating direct ink writing (DIW) technique and a heating-accelerated in situ gelation mechanism. Enabled by an integrated Joule heater at the printhead, extruded thermosetting inks can quickly cure in situ, allowing for DIW of various thermosets with viscosities spanning five orders of magnitude, printed height over 100 mm, and high resolution of 50 μm. We further demonstrate DIW of a set of heterogenous thermosets using multiple functional materials and present a hybrid printing of a multilayer soft electronic circuit. Our ISDH strategy paves the way for fast manufacturing of thermosets for various emerging fields.
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Nature Communications
·
2022
·Vol. 13
·期 1
·1-14
·
IF 17.694
Sun Mengmeng,Hao Bo,Yang Shihao,Wang Xin,Majidi Carmel,Zhang Li
Miniature magnetic soft machines could significantly impact minimally invasive robotics and biomedical applications. However, most soft machines are limited to solid magnetic materials, whereas further progress also relies on fluidic constructs obtained by reconfiguring liquid magnetic materials, such as ferrofluid. Here we show how harnessing the wettability of ferrofluids allows for controlled reconfigurability and the ability to create versatile soft machines. The ferrofluid droplet exhibits multimodal motions, and a single droplet can be controlled to split into multiple sub-droplets and then re-fuse back on demand. The soft droplet machine can negotiate changing terrains in unstructured environments. In addition, the ferrofluid droplets can be configured as a liquid capsule, enabling cargo delivery; a wireless omnidirectional liquid cilia matrix capable of pumping biofluids; and a wireless liquid skin, allowing multiple types of miniature soft machine construction. This work improves small magnetic soft machines’ achievable complexity and boosts their future biomedical applications capabilities.
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Nature Energy
·
2023
·Vol. 8
·期 3
·294-303
·
IF 56.7
Luo Long,Zeng Haipeng,Wang Zaiwei,Li Min,You Shuai,Chen Bin,Maxwell Aidan,An Qinyou,Cui Lianmeng,Luo Deying,Hu Juntao,Li Shangzhi,Cai Xueqing,Li Weixi,Li Lin,Guo Rui,Huang Rong,Liang Wenxi,Lu Zheng-Hong,Mai Liqiang,Rong Yaoguang,Sargent Edward H.,Li Xiong
Two-dimensional (2D) and quasi-2D modifications of three-dimensional (3D) perovskite active layers have contributed to advances in the performance of perovskite solar cells (PSCs). However, the ionic diffusion between the surface 2D and bulk 3D perovskites leads to the degradation of the 3D/2D perovskite heterostructures and limits the long-term stability of PSCs. Here we incorporate a cross-linked polymer (CLP) on the top of a 3D perovskite layer and then deposit a 2D perovskite layer via a vapour-assisted two-step process to form a 3D/CLP/2D perovskite heterostructure. Photoluminescence spectra and thickness-profiled elemental analysis indicate that the CLP stabilizes the heterostructure by inhibiting the diffusion of cations (formamidinium, FA + and 4-fluorophenylethylammonium, 4F-PEA + ) between the 2D and 3D perovskites. For devices based on carbon electrodes, we report small-area devices with an efficiency of 21.2% and mini-modules with an efficiency of 19.6%. Devices retain 90% of initial performance after 4,390 hours operation under maximum power point tracking and one-sun illumination at elevated temperatures.
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 6
·2494-2505
·
IF 4.5
Ding Jiancai,Li Guangpeng,Ran Rui,Wu Xiaodong,Weng Duan,Yang Zhigang
Manganese-based mullite-type and perovskite-type mixed oxides were prepared by sol–gel method, and then palladium was loaded onto the mixed oxides by wet impregnation method. The catalytic performance for methane combustion, the influence of the supports, and the interaction between noble metal and the mixed oxides were investigated via experiments and theoretical calculations. The Pd/SmMn 2 O 5 catalyst exhibited superior low-temperature catalytic activity for methane combustion ( T 50 = 328 °C), which was superior to the Pd/perovskites catalysts and even better than Pd/Al 2 O 3 catalyst. It was ascribed to the abundant labile surface lattice oxygen species with high mobility and the uniformly dispersed Pd species on SmMn 2 O 5 , as revealed by TEM, CO-chemisorption, H 2 -TPR and XPS. DFT calculations verified the significant metal-support interaction via electron transfer between Pd and SmMn 2 O 5 , which further activated the lattice oxygen and improved the catalytic performance. It demonstrates the prospect of utilizing SmMn 2 O 5 mullite to optimize the typical noble metal catalysts. Graphical Abstract
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VETERINARY RESEARCH
·
2022
·Vol. 53
·期 1
·1-15
·
IF 3.829
Li Ruidan,Liang Qian,Tian Sicheng,Zhang Yunwen,Liu Sijing,Ou Qian,Chen Zhaobin,Wang Chuan
Listeriolysin O (LLO) is the main virulence protein of Listeria monocytogenes (LM), that helps LM escape lysosomes. We previously found that the cellular immune response elicited by L.ivanovii (LI) is weaker than that elicited by LM. We speculated that this may be related to the function of ivanolysin O (ILO). Here, we constructed hemolysin gene deletion strain, LIΔ ilo , and a modified strain, LIΔ ilo :: hly , in which ilo was replaced by hly . Prokaryotic transcriptome sequencing was performed on LI, LIΔ ilo , and LIΔ ilo :: hly . Transcriptome differences between the three strains were compared, and genes and pathways with significant differences between the three strains were analyzed. Prokaryotic transcriptome sequencing results revealed the relationship of ilo to the ribosome, quorum sensing, and phosphotransferase system (PTS) pathways, etc. LIΔ ilo exhibited attenuated biofilm formation ability compared to LI. Biofilm formation was significantly recovered or even increased after replenishing hly . After knocking out ilo , the relative expression levels of some virulence genes, including sigB , prfA , actA , smcL , and virR , were up-regulated compared to LI. After replenishing hly , these genes were down-regulated compared to LIΔ ilo. The trend and degree of such variation were not completely consistent when cultured in media containing only monosaccharides or disaccharides. The results confirmed that hemolysin is related to some important biological properties of Listeria , including biofilm formation and virulence gene expression levels. This is the first comprehensive study on ILO function at the transcriptomic level and the first evidence of a relationship between Listeria hemolysin and biofilm formation.
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Nano-Micro Letters
·
2022
·Vol. 15
·期 1
·1-18
·
IF 23.655
Shi Bori,Wang Pingyang,Feng Jingyun,Xue Chang,Yang Gaojie,Liao Qingwei,Zhang Mengying,Zhang Xingcai,Wen Weijia,Wu Jinbo
The split-ring topography is studied systematically from wettability, evaporation assembly to optoelectronic devices.
An efficient dual-function laser etching scheme has been developed to fabricate the split-ring lyophilic pattern and the lateral electrode array simultaneously.
A non-contact human-machine interface based on CsPbBr 3 perovskite photodetector arrays has been successfully applied to wearable devices, automobile displays, robot remote control.
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