MICROCHIMICA ACTA
·
2010
·Vol. 172
·期 3
·343-349
·
IF 2.648
Yin Huanshun,Zhou Yunlei,Ma Qiang,Liu Tao,Ai Shiyun,Zhu Lusheng
The electrochemical oxidation of guanosine-5′-monophosphate (GMP) was studied with a glassy carbon electrode modified with a composite made from graphene and multi-walled carbon nanotubes. GMP undergoes an irreversible oxidation process at an oxidation peak potential of 987 mV in phosphate buffer solution. Compared to other electrodes, the oxidation peak current of GMP with this electrode was significantly increased, and the corresponding oxidation peak potential negatively shifted, thereby indicating that the modified material exhibited electrochemical catalytic activity towards GMP. Chronocoulometry demonstrates that the material also effectively increases the surface area of the electrode and increases the amount of GMP adsorbed. Under the optimum conditions, the oxidation current is proportional to the GMP concentration in the range from 0.1 to 59.7 μM with a correlation coefficient of 0.9991. The detection limit is 0.025 μM (at S/N = 3).
We have developed an electrochemical method for sensitive determination of guanosine-5’-monophosphate (1) based on graphene and multi-walled carbon nanotubes modified glassy carbon electrode by amperometry.
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Biomass Conversion and Biorefinery
·
2024
·
IF 3.5
Yao Pin,Yan Tinggui,Dai Xin,Xiao Ya,Xiang Weixue,Wu Yunqi
Deposition and corrosion in boilers caused by the release of alkali compounds in agricultural residua pose significant challenges to the widespread utilization of biomass energy. Phosphate tailings (PT), which is rich in Ca, Mg, and P, have the potential to mitigate the potassium (K) release of biomass straw. However, the impact of PT on K immigration has not been investigated. To elucidate the influence of PT on K immigration, thermal analysis, K concentration determination, and mineral evolution during heating of ash were conducted. These results were compared with those obtained from biomass mixed with kaolin, an effective additive known to alleviate K release in biomass. The findings revealed that PT resulted in lower K release at temperatures below 600 ℃ compared to kaolin. Because the reaction between PT and K-compounds to form K-phosphate occurs more readily than the formation of K-silicate at lower temperatures. However, the effectiveness of PT diminished as the temperature increased. One reason is the decomposition of K-phosphate, resulting in the volatilization of K at higher temperatures. Another reason is the competition among Ca, Mg, and K for the opportunity to react with Si and Al, leading to the formation of more stable Ca and Mg aluminosilicate and facilitating the release of K. It is noteworthy that the addition of kaolin to rice straw causes a violent release of K in 1000–1200 ℃. This can be attributed to the surplus of Si in the system, promoting the release after the eutectic melting between K-silicate and SiO 2 .
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Nanoscale Research Letters
·
2011
·Vol. 6
·期 1
·1-10
·
IF 2.56
Kai Wei,Xiaojun Xu,Ximing Pu,Zhenqing Hou,Qiqing Zhang
The evaluation of the toxicity of magnetic nanoparticles (MNPs) has attracted much attention in recent years. The current study aimed to investigate the cytotoxic effects of Fe 3 O 4 , oleic acid-coated Fe 3 O 4 (OA-Fe 3 O 4 ), and carbon-coated Fe (C-Fe) nanoparticles on human hepatoma BEL-7402 cells and the mechanisms. WST-1 assay demonstrated that the cytotoxicity of three types of MNPs was in a dose-dependent manner. G1 (Fe 3 O 4 and OA-Fe 3 O 4 ) phase and G2 (C-Fe) phase cell arrests and apoptosis induced by MNPs were detected by flow cytometry analysis. The increase in apoptosis was accompanied with the Bax over-expression, mitochondrial membrane potential decrease, and the release of cytochrome C from mitochondria into cytosol. Moreover, apoptosis was further confirmed by morphological and biochemical hallmarks, such as swollen mitochondria with lysing cristae and caspase-3 activation. Our results revealed that certain concentrations of the three types of MNPs affect BEL-7402 cells viability via cell arrest and inducing apoptosis, and the MNPs-induced apoptosis is mediated through the mitochondrial-dependent pathway. The influence potency of MNPs observed in all experiments would be: C-Fe > Fe 3 O 4 > OA-Fe 3 O 4 .
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Scientific Reports
·
2024
·Vol. 14
·期 1
·1-9
·
IF 3.8
Li Changming,Tan Yong,Liu Chunyu,Gao Xun,Lv Zhong
The substitution of microbial fertilizer for chemical fertilizer can not only improve soil fertility but also effectively enhance rice quality. To investigate the effect of different amounts of combined application of chemical fertilizer and microbial fertilizer on the amylose content of rice, this study adopts theoretical calculations to compare the preprocessed Raman spectroscopy information of rice with reduced fertilization and establishes a recognition model for the amylose content of rice, which is used to detect the amylose content in rice. Based on the amylose spectral values measured by Raman spectroscopy and the known starch structure and functional groups, the Raman peaks are mainly distributed in the range of 400 cm − 1 to 1400 cm − 1 . The Raman characteristic peaks at 483 cm − 1 , 869 cm − 1 , 933 cm − 1 , 1082 cm − 1 , 1126 cm − 1 , 1335 cm − 1 , 1385 cm − 1 , and 1455 cm − 1 exhibit strong vibration modes, which are consistent with its main nutrient component of amylose. By comparing the measured amylose content in the regions treated with microbial fertilizer combined with different amounts of reduced fertilization and the spectral intensity values of amylose measured by Raman spectroscopy, the results show that the treatment of combining conventional amounts of microbial fertilizer with different amounts of reduced chemical fertilizer exhibits a decreasing trend in the amylose content of rice.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-14
·
IF 14.7
Wan Sijie,Wang Wang,Cheng Bei,Luo Guoqiang,Shen Qiang,Yu Jiaguo,Zhang Jianjun,Cao Shaowen,Zhang Lianmeng
The rapid recombination of photoinduced charge carriers in semiconductors fundamentally limits their application in photocatalysis. Herein, we report that a superlattice interface and S-scheme heterojunction based on Mn 0.5 Cd 0.5 S nanorods can significantly promote ultrafast charge separation and transfer. Specifically, the axially distributed zinc blende/wurtzite superlattice interfaces in Mn 0.5 Cd 0.5 S nanorods can redistribute photoinduced charge carriers more effectively when boosted by homogeneous internal electric fields and promotes bulk separation. Accordingly, S-scheme heterojunctions between the Mn 0.5 Cd 0.5 S nanorods and MnWO 4 nanoparticles can further accelerate the surface separation of charge carriers via a heterogeneous internal electric field. Subsequent capture of the photoelectrons by adsorbed H 2 O is as fast as several picoseconds which results in a photocatalytic H 2 evolution rate of 54.4 mmol·g −1 ·h −1 without any cocatalyst under simulated solar irradiation. The yields are increased by a factor of ~5 times relative to control samples and an apparent quantum efficiency of 63.1% at 420 nm is measured. This work provides a protocol for designing synergistic interface structure for efficient photocatalysis.
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-9
·
IF 15.7
Wang Shixun,Wei Zhiquan,Hong Hu,Guo Xun,Wang Yiqiao,Chen Ze,Zhang Dechao,Zhang Xiaoyu,Yang Xuyong,Zhi Chunyi
The growing potential of low-dimensional metal-halide perovskites as conversion-type cathode materials is limited by electrochemically inert B-site cations, diminishing the battery capacity and energy density. Here, we design a benzyltriethylammonium tellurium iodide perovskite, (BzTEA) 2 TeI 6 , as the cathode material, enabling X- and B-site elements with highly reversible chalcogen- and halogen-related redox reactions, respectively. The engineered perovskite can confine active elements, alleviate the shuttle effect and promote the transfer of Cl - on its surface. This allows for the utilization of inert high-valent tellurium cations, eventually realizing a special eleven-electron transfer mode (Te 6+ /Te 4+ /Te 2- , I + /I 0 /I - , and Cl 0 /Cl - ) in suitable electrolytes. The Zn||(BzTEA) 2 TeI 6 battery exhibited a high capacity of up to 473 mAh g -1 Te/I and a large energy density of 577 Wh kg -1 Te/I at 0.5 A g -1 , with capacity retention up to 82% after 500 cycles at 3 A g -1 . The work sheds light on the design of high-energy batteries utilizing chalcogen-halide perovskite cathodes.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 3
·1-12
·
IF 5.3
Li Lingling,Zhang Xinru,Chang Xianglei,Meng Xianhua,Wang Weifeng,Zhang Ying,Yang Aimei,Yang Junli
A highly selective and sensitive silicon nanoparticles (Si NPs) biosensor was developed for dopamine (DA) detection utilizing synchronous fluorescence spectroscopy (SFS). Si NPs were synthesized via a one-step hydrothermal method, utilizing 3-aminopropyltriethoxysilane (APTES) as the silane precursor and polyethyleneimine (PEI) as the reducing agent. The Si NPs exhibited a spherical morphology, with an average diameter of 3.7 nm. Additionally, the Si NPs demonstrated remarkable fluorescent properties. When integrated into the DA detection process utilizing SFS, the synchronous fluorescence spectrum of the DA system exclusively exhibits a peak at 530 nm, whereas systems involving epinephrine and norepinephrine both display peaks at 484 nm and 530 nm. Consequently, this detection system exhibits a high capacity for effectively differentiating between DA and other catecholamines (epinephrine and norepinephrine), ensuring a high degree of specificity in the detection process. Additionally, this combined approach also presents a strong linear relationship between the enhancement of synchronous fluorescence intensity (F 530 /F 484 ) and DA concentrations within the concentration ranges 1–10 μ M and 10–50 μ M, respectively. The limit of detection (LOD) was 0.22 μ M (3 σ / k ). Finally, the biosensor was successfully employed for the detection of DA in the spiked serum samples. This work introduced a novel approach for DA detection and provided a valuable technical platform for rapid monitoring of DA levels in biological samples. Graphical abstract
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JOURNAL OF SOLUTION CHEMISTRY
·
2017
·Vol. 46
·期 12
·2281-2292
·
IF 1.342
Liu Bijun,Tian Yin,Yu Qianhong,Li Qiang,Mu Wanjun,Tan Zhaoyi,Wu Fengchang,Wang Dongqi,Li Xingliang
O-Phospho- l -serine is one of the naturally occurring phosphorylated amino acids, having important pharmacological activity and bioactivity. The protonation constants of O-phospho- l -serine were determined by means of potentiometric titrations at 25 °C and ionic strength of 0.5 mol·L −1 (NaCl). The heat effects of the protonation reaction of the O-phospho- l -serine were measured by direct calorimetry. NMR spectroscopy has demonstrated that the first protonation site occurs at the nitrogen atom in the amino group, followed by one of the oxygen atoms in the phosphono group, and finally the carboxyl oxygen atom. This trend is in good agreement with the enthalpy of protonation and quantum chemical calculations. These data will help to predict the speciation of O-phospho- l -serine in physiological systems.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2017
·Vol. 44
·期 2
·1105-1117
·
IF 1.369
Li Na,Gan Kaifeng,Lu Deli,Zhang Jinlong,Wang Lingzhi
Abstract A three-dimensionally macroporous–mesoporous lithium ion sieve (3DM-H 4 Ti 5 O 12 ) was transformed from 3DM-Li 4 Ti 5 O 12 through washing with HCl solution, which was synthesized by a combination of hydrothermal and low-temperature calcination (600 °C) treatment, using polystyrene microarray as hard-template, and titanium isopropoxide and lithium acetate as co-precursors. The influence of HCl concentration and temperature on the deintercalation rate of Li and Ti from Li 4 Ti 5 O 12 was specifically explored to maximize the extraction ratio of Li/Ti. The acceleration of Li extraction and insertion in a porous structure was verified using nonporous Li 4 Ti 5 O 12 as a control. 3DM-H 4 Ti 5 O 12 showed superior Li + adsorption performance (5.51 mmol/g) compared with its nonporous counterpart (1.12 mmol/g), which was ascribed to the reduced Li + mass transfer resistance in the highly interconnected porous channel. The ion selectivity of the 3DM-H 4 Ti 5 O 12 lithium ion sieve followed the order of Li + > Na + ~ Ca 2+ > K + > Mg 2+ . The adsorption performance could be maintained after six cycles. The high adsorption capacity, excellent selectivity, and good recyclability demonstrate the prosperous potential application of 3DM-H 4 Ti 5 O 12 . Graphical Abstract
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CHEMICAL PAPERS
·
2017
·Vol. 72
·期 2
·359-368
·
IF 1.258
Xia Bin,Yao Juan-juan,Han Chen-xi,Zhang Zhi,Chen Xiang-yu,Fang Yan-juan
The degradation of ofloxacin (OFX) at low concentration in aqueous solution by UVA-LED/TiO 2 nanotube arrays photocatalytic fuel cells (UVA-LED/TiO 2 NTs PFCs) was investigated. TiO 2 nanotube arrays (TiO 2 NTs) photoanode prepared by anodization-constituted anatase–rutile bicrystalline framework. The results indicated that the degradation efficiency of OFX by UVA-LED/TiO 2 NTs PFC was significantly enhanced by 14.3% compared with UVA-LED/TiO 2 NTs photocatalysis. The pH affected the degradation efficiency markedly; the highest degradation efficiency (95.0%) and the pseudo-first-order reaction rate constant k value (0.049 min −1 ) were achieved in neutral condition (pH 7.0). The degradation efficiency increased with the increasing concentration of dissolved oxygen (DO) in the UVA-LED/TiO 2 NTs PFC. The main reactive species of OFX degradation are positive holes (h + ) and superoxide ion radicals (O
·− 2
) in a DO sufficient condition. Furthermore, the possible pathways of OFX degradation were proposed.
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INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
·
2017
·Vol. 96
·期 5
·1647-1653
·
IF 2.209
Zhan W.,Tu J. S.,Qian X. Z.,Li J.,Liu J.
Ionic liquid used in Friedel-Crafts reaction catalytic of dialkyl diphenylamine is a green environmental method. In this paper, butyl-octyl-diphenylamine (BODPA) was synthesized by the series of 1-butyl-3-methylimidazolium chloroaluminate (BMIM-AlCl 3 ) ionic liquids catalysts. Pressure differential scanning calorimetry (PDSC) was used to test antioxidant properties of BODPA in lubricating oil. The influences of various reaction parameters such as dosage of catalysts, molar ratio of diphenylamine to chloralkane, reaction temperature, and time on the alkylation catalyzed by BMIM-AlCl 3 have been studied. The molecular structure and content of alkyl diphenylamine were also characterized by FT-IR/GC-MS.
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JOURNAL OF INDUSTRIAL MICROBIOLOGY & BIOTECHNOLOGY
·
2017
·Vol. 44
·期 8
·1245-1260
·
IF 2.81
Wu Qian,Liu Tingting,Zhu Liying,Huang He,Jiang Ling
Genetic research enables the evolution of novel biochemical reactions for the production of valuable chemicals from environmentally-friendly raw materials. However, the choice of appropriate microorganisms to support these reactions, which must have strong robustness and be capable of a significant product output, is a major difficulty. In the present study, the complete genome of the Clostridium tyrobutyricum strain CCTCC W428, a hydrogen- and butyric acid-producing bacterium with increased oxidative tolerance was analyzed. A total length of 3,011,209 bp of the C. tyrobutyricum genome with a GC content of 31.04% was assembled, and 3038 genes were discovered. Furthermore, a comparative clustering of proteins from C. tyrobutyricum CCTCC W428, C. acetobutylicum ATCC 824, and C. butyricum KNU-L09 was conducted. The results of genomic analysis indicate that butyric acid is produced by CCTCC W428 from butyryl-CoA through acetate reassimilation via CoA transferase, instead of the well-established phosphotransbutyrylase-butyrate kinase pathway. In addition, we identified ten proteins putatively involved in hydrogen production and 21 proteins associated with CRISPR systems, together with 358 ORFs related to ABC transporters and transcriptional regulators. Enzymes, such as oxidoreductases, HNH endonucleases, and catalase, were also found in this species. The genome sequence illustrates that C. tyrobutyricum has several desirable traits, and is expected to be suitable as a platform for the high-level production of bulk chemicals as well as bioenergy.
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