FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES
·
2018
·
IF 1.011
Min-Zun Ji,Feng-Chao Guo,Pu Zhang,Zhi-Xin Guo
The mechanochemical reaction of C60 and Bi(NO3)3·5H2O was performed under ball-milling condition. The product was well characterized by spectroscopic methods such as IR, Raman, UV-vis, 13C NMR, as well as elemental analysis method. The spectroscopic investigation indicates that some hydroxyl and nitro groups are attached to the C60 and no profound structural changes occur for the C60 cage in the product. The elemental analysis gives an average composition of C60(NO2)2(OH)21 for the product. A possible mechanism is suggested for the reaction.
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LANGMUIR
·
2020
·
IF 3.557
Kun He,Cong Shen,Yanqing Zhu,Xiaoli Chen,Zhuoneng Bi,Thandapani Marimuthu,Gang Xu,Xueqing Xu
Perovskite nanomaterials have been fascinating for commercial applications and fundamental research owing to their excellent optical properties and satisfactory processability. They are expected to be alternative downconversion materials in phosphor-converted LEDs for lighting or display technology. However, owing to their low formation energy and large specific surface area, perovskite nanomaterials are sensitive to environmental stress like humidity, heat, etc. In this paper, cubic CsPbI3 quantum dots (QDs) with improved stability are synthesized using (3-aminopropyl)triethoxysilane (APTES). These luminescent CsPbI3 QDs passivated by APTES not only show excellent stability when stored in hexane but also possess outstanding steadiness for lattice structure when prepared as a thin film in open air. They do not decompose immediately in the water. Such excellent stability is attributed to the hindrance from hydrolysis of APTES, which forms an analogous core–shell structure to protect the “core” CsPbI3 QDs. Furthermore, an additional iodine source is added to enhance their emissionm and CsPbI3QDs with a PLQY of 84% are synthesized.
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BIOCHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 4.446
Shan Yuan,Miaomiao Jin,Chao Xu,Wencheng Yin,Mingsha Zhao,Mo Xian,Wei Liu
3-(Aminomethyl) pyridine (3-AMP) is a versatile compound for the synthesis of pharmaceuticals, agricultural chemicals and numerous polymers. Efficient and mild biocatalytic synthesis is often an excellent supplement to traditional chemical synthesis methods. However, there has been no report of biocatalytic 3-AMP synthesis. In this paper, 3-AMP was synthesized for the first time by using biocatalysts co-expressing carboxylic acid reductase from Neurospora crassa (ncCAR) and ω-transaminase from Ochrobactrum anthropi (OATA) in one pot. In addition, the metabolic pathway was optimized by knocking out the transcriptional dual regulator arcA , which resulted in a 90% increase in the yield of 3-AMP. Furthermore, efficient self-sufficient whole-cell bioconversion was established by optimization, achieving 93% yield and a 40.6 mM (4.4 g/L) titer of 3-AMP without additional carbon sources. This whole-cell bioconversion system was also suitable for the high-efficiency biocatalytic synthesis of other aromatic or heterocyclic primary amines, such as benzylamine, 2-furfurylamine, 4-fluorobenzylamine, 2,4-difluorobenzylamine and 2-(aminomethyl) pyridine. Being entirely biocatalytic, our one-pot procedure provides considerable advantages in terms of economic, environmental and safety impacts over reported chemical methods.
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BIOSENSORS & BIOELECTRONICS
·
2021
·
IF 10.618
Lihang Zhu,Shuang Li,Wenxin Liu,Jing Chen,Qiwen Yu,Zhen Zhang,Yi Li,Jun Liu,Xing Chen
As an oxidase stress biomarker, 3-nitrotyrosine is closely associated with many cardiovascular diseases. Thus, early diagnosis and real time detection of 3-nitrotyrosine at bedside are highly important. Herein, we developed a handheld electrochemiluminescence (ECL) analysis device, which integrates printed circuit board (PCB) for electrical stimulation and smartphone for optical signals readout. Fast and accurate determination of 3-nitrotyrosine was achieved with Antibody/Ru(dcpy) 3 2+ @AuNPs/MoS 2 modified Au electrode (Ab/Ru@AuNPs/MoS 2 ) for ECL analysis. The linear range of 3-nitrotyrosine detection was from 10 −8 mol/L to 10 −6 mol/L with a detection limit of 8.4 × 10 −9 mol/L. In addition, an Android application was developed to realize real time analysis of ECL emissions and results readout for detection. To confirm the usage of the device, spiked serum with different concentrations was tested and the results indicated the practical reliability and stability of this device. The operating procedure for ECL analysis in this device is extremely easy and electrical stimulation was adjustable from 0 V to 5 V for general ECL systems. Thus, we believe this handheld device for ECL analysis has extensive prospects for application in Point-of-care testing and health caring.
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PubMed
高影响因子
Small
·
2020
·Vol. 17
·期 27
·2002524
·
IF 11.459
Runze Chen,Xiaoyu Cheng,Chi Zhang,Hao Wu,Haiming Zhu,Sailing He
Metal nanoclusters with distinct photophysical and photochemical properties have drawn intense research interests for their applications in optoelectronics, catalysis, and biomedicine. Herein, strong evidence is provided that light metal is capable of generating comparable optical responses of noble metal nanoclusters, but at much shorter wavelength. Air-stable, size-uniform, sub-3 nm aluminum nanocrystals are prepared with simple solution based synthetic procedures, with photoluminescence located in the ultraviolet range and short exciton lifetime. Partial modulation of the photoluminescence is achieved, indicating the key role of surface oxides. This work is envisioned to inspire new frontiers of nanocluster research with light metals.
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PubMed
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CRYSTAL GROWTH & DESIGN
·
2023
·
IF 3.8
Zhihan Liang,Xiaohan Li,Shaochang Ji,Jiayi Cheng,Haiquan Jing,Jinyan Zhang,Yanyue Lu
The generation of multiple stoichiometric cocrystals from safe and nontoxic water is a rare occurrence. This study explored three different stoichiometric cocrystals (1:1, 1:2, and 2:1) of pyrazinamide-3-nitrophthalic acid cocrystals characterized by single crystal X-ray diffraction, powder X-ray diffraction, differential scanning calorimetry, and Fourier transform infrared spectrophotometry. Besides, the hydrogen bonding interaction was analyzed by the molecular electrostatic potential surfaces and the Hirshfeld surface. The hygroscopicity and solubility of the three cocrystals and the study of cocrystal transformation revealed a strong correlation between the properties of the cocrystals and the internal arrangement of the molecules. The most stable form (1:2) showed the strongest stability and the best performance in the evaluation test and had the greatest application potential.
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Analytical Methods
·
2023
·Vol. 16
·期 2
·276-283
·
IF 3.1
Ting Xu,Qing Fu,Zeng Qingru,Zhaojie Wang,Xin Liu,Shensheng Xiao,Xiaoming Jiang,Yuepeng Lu,Zhiyong Gong,Yongning Wu,Min Fang
A rapid fluorescence detection method was established for 3-monochloropropane-1,2-diol (3-MCPD). The detection system works based on the fluorescence quenching of pyrocatechol–polyethyleneimine (PCh–PEI) polymer by 3-MCPD. The fluorescence quenching ability of 3-MCPD for PCh–PEI polymer was measured at different pH and temperatures. Indeed, in the presence of 3-MCPD, the fluorescence intensity of PCh–PEI polymer solution was quenched best at 100 °C and pH 8.5. Also, the effect of different concentrations of 3-MCPD on the optical properties of the PCh–PEI polymer was examined. Under optimal experimental conditions, fluorescence detection was linear in a range of 0.08–2.0 mg per L 3-MCPD, with a calculated detection limit of 0.06 mg L−1 and a correlation coefficient of 0.9974. Concisely, the reported method has good sensitivity and can be used for the rapid detection of 3-MCPD contamination in food products.
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Reaction Chemistry & Engineering
·
2023
·Vol. 8
·期 8
·1993-2000
·
IF 3.9
Shichun Weng,Wei Feng,Wenqian Wu,Zichao Guo,Junjie Li,Huanhuan Chen,Liping Chen,Wanghua Chen
3-Amino-4-amidoximinofurazan (AAOF) is an important precursor for the synthesis of high energy furazan energetic materials. The traditional batchwise synthesis approach has the shortcomings of low productivity and high possibility of thermal runaway. This article aims to develop a continuous-flow and safe synthesis approach for AAOF. To achieve this goal, the precipitation problems appearing in the oximation and cyclization reaction stages have been first tackled by diluting the hydroxylamine hydrochloride and sodium hydroxide solution with water, which also reduced the thermal risk of AAOF synthesis. The continuous-flow platform for AAOF synthesis has been established, and the continuous-flow operation parameters have been optimized. The optimal temperatures for the nitrosation–rearrangement coupling reaction, neutralization reaction, oximation and cyclization were 15 °C, 15 °C, 25 °C and 115 °C, respectively. The optimal set retention times for these four stages were 15 min, 5 min, 60 min and 10 min, respectively. The continuous-flow synthesis approach offered an optimal yield of AAOF (95%), which is comparable to the result of batch operation. The total flow rate of the whole process is 10.34 mL min−1, and the final productivity is calculated to be about 0.546 mol h−1 of AAOF. The main merits for the continuous-flow synthesis of AAOF include the following: (1) the reaction time is only one-third of that for batch operation and (2) continuous-flow operation is inherently safe due to the lower liquid holdup and stronger temperature control ability. This work is supposed to be beneficial to the continuous and safe synthesis of AAOF.
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JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY
·
2023
·Vol. 100
·期 8
·615-621
·
IF 2
Ting Xu,Qingru Zeng,Xin Liu,Shensheng Xiao,Xiaoming Jiang,Yuepeng Lu,Zhiyong Gong,Yonggui Gao,Min Fang
There are more and more studies on the detection method of 3-chloro-1,2-propanediol fatty acid esters (3-MCPD esters) at present, by comparing these methods for the determination of 3-MCPD esters. Indirect methods, which determine total amount of 3-MCPD after hydrolysis of the esters, have an advantage over direct methods. The existing indirect methods, however, may yield unreliable results or require long hours of alkaline methanolysis. In contrast, the indirect enzymatic hydrolysis method has mild conditions and more accurate results. In this study, we developed a reliable and rapid indirect method for determination of 3-MCPD esters. 3-MCPD esters were enzymolysis to 3-MCPD by indirect enzymatic hydrolysis method, and the conditions of enzymatic hydrolysis were optimized, the content of 3-MCPD after enzymatic hydrolysis was detected by gas chromatography–mass spectrometry (GC–MS) and the yield was calculated. Finally, the optimum conditions for enzymatic hydrolysis of 3-MCPD esters were determined. According to the optimal enzymatic hydrolysis condition, the contents of 3-MCPD esters in four food oils were determined. The method is simple and sensitive and can meet the requirement of 3-MCPD esters detection in general oils.
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FOOD CHEMISTRY
·
2022
·
IF 9.231
Jianyong Zhang,Hongchun Cui,Jiahuan Qiu,Xiaoqing Wang,Yixin Zhong,Caiping Yao,Lanying Yao,Qunxiong Zheng,ChunHua Xiong
The application of Epigallocatechin-3-gallate (EGCG) in food industry was limited by its low stability in aqueous solutions and poor bioavailability in vivo . The novel EGCG glycosylated arachin nanoparticles (Ara-CMCS-EGCG) and EGCG glycosylated casein nanoparticles (Cas-CMCS-EGCG) were prepared to improve the stability and bioavailability of EGCG. The effect of different variables on the storage stability and the slow-release behavior of novel glycosylation complexes in nanoparticle background solution and artificial gastrointestinal fluid were investigated. The results showed that the DPPH scavenging activity of Ara-CMCS-EGCG and Cas-CMCS-EGCG were stable in temperature (25 ∼ 70 °C). EGCG could enhance the crosslinking effect of molecular particles in glycosylation complexes solution. The glycosylated protein nanoparticles were stable to acid-base and enzymolysis in simulated gastrointestinal fluid. The release rate of EGCG in simulated intestinal fluid was higher than that in simulated gastric fluid. The glycosylated protein carrier can not only release EGCG slowly, but also significantly improve the stability and bioavailability of EGCG in simulated gastrointestinal fluid.
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BIOCHEMICAL GENETICS
·
2019
·Vol. 57
·期 3
·443-454
·
IF 1.931
Zhang Yu,Zhang Xiaohuan,Xiao Shiyuan,Qi Wei,Xu Jingliang,Yuan Zhenhong,Wang Zhongming
3-Methyl-1-butanol (3MB) is a promising biofuel that can be produced from 2-ketoisocaproate via the common l -leucine biosynthesis pathway. Corynebacterium glutamicum was chosen as a host bacterium because of its strong resistance to isobutanol. In the current study, several strategies were designed to overproduce 3MB in C. glutamicum through a non-fermentation pathway. The engineered C. glutamicum mutant was obtained by silencing the pyruvate dehydrogenase gene complex ( aceE ) and deleting the lactic dehydrogenase gene ( ldh ), followed by mutagenesis with diethyl sulfate (DES) and selection with Fmoc-3-4-thiazolyl- l -alanine (FTA). The mutant could produce 659 mg/L of 3MB after 12 h of incubation. To facilitate carbon flux to 3MB biosynthesis, the engineered recombinant was also constructed without branched-chain acid aminotransferase ( ilvE ) activity by deleting the ilvE gene. This recombinant could produce 697 mg/L of 3MB after 12 h of incubation.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Erqing Zhao,Yudi Guo,Guangri Xu,Long Yuan,Jingcheng Liu,Xiaobo Li,Li Yang,Jingjing Ma,Yuanchao Li,Shumin Fan
Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 is regarded as one of the most promising solid electrolytes for all solid state lithium ion batteries (ASSLIBS). However, its grain boundary conductivity is still low, which reduces the total conductivity of electrolyte. In this work, in order to further improve the electrical conductivity of Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 , a series of Y doped Li 1.3 Al 0.3-x Y x Ti 1.7 (PO 4 ) 3 (x = 0, 0.025, 0.05, 0.075 and 0.15) solid electrolytes were synthesized using a modified solid state method. Effects of Y doping content on morphology, phase and electrical conductivity of Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 electrolyte materials were systematically investigated. All synthetic electrolyte powders show Nasicon-like structure, well-shaped polyhedral morphology as well as good crystallinity. Y dopant content has a great influence on electrochemical properties of electrolytes. The high total conductivity of 7.8 × 10 −4 S/cm at room temperature and a low activation energy of 0.17 eV is obtained for the electrolyte with the Y doping content of 0.075 due to the increasing of grain boundary conductivity, and its electrical conductivity is about 2 times larger than that of the undoped electrolyte. The excellent electrochemical performance is mainly attributed to high electrolyte density which results from the good sintering property of electrolyte materials as well as the existence of YPO 4 phase at grain boundaries. Additionally, this electrolyte has a negligible electronic conductivity. These results suggest that Y doped Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 can be used as an alternative solid electrolyte for all solid state lithium ion batteries.
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