CORROSION
·
2013
·Vol. 69
·期 7
·672-680
·
IF 1.772
Jiang Y.Y.,Chen Y.,Ye Z.Y.,Chen H.,Zhang Z.,Zhang J.Q.,Cao C.N.
N-[2-[(2-aminoethyl) amino] ethyl]-9-octadecenamide (AAOA) has been synthesized in the lab, then tested as an effective and economic acid inhibitor for A3 steel in an acid medium with electrochemical techniques (electrochemical impedance and polarization curve). The results show that AAOA acts as a good mixed-type inhibitor for A3 steel in 1 M hydrochloric acid (HCl) solution, and the inhibition efficiency reaches 94% at the concentration of 200 mg/L. The corrosion current density of A3 steel increases with the increasing temperature from 20°C to 60°C. Meanwhile, Langmuir isotherm is found to provide the description of the adsorption behavior of AAOA, and the value of adsorption free energy (ΔG 0 ) is as low as low as −37.3 kJ/mol. One can assume the adsorption of inhibitor molecules on the metal surface is by chemisorption, which has been understood taking into account some other adsorption parameters (ΔH 0 , ΔS 0 ) and the activation parameters (E a , ΔH * , ΔG * ).
研究领域:
材料科学
·
腐蚀与防护
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2015
·Vol. 91
·期 4
·1199-1207
·
IF 2.349
Xin-Jun Yu,Jie Sun,Jian-Yong Zheng,Ya-Qi Sun,Zhao Wang
BACKGROUND Phytohormones are chemical messengers that have a positive effect on biodiesel production of microalgae at low concentrations. However, the effect of phytohormone 6-benzylaminopurine on lipid and docosahexaenoic acid (DHA) production in marine DHA-producer Aurantiochytrium has never been reported. In this study, a GC-MS-based metabolomics method combined with a multivariate analysis is applied to reveal the metabolic mechanism of 6-benzylaminopurine enhancing production of lipid and DHA in Aurantiochytrium sp.YLH70. RESULTS In total, 71 metabolites were identified by GC-MS. The PCA model revealed that 76.9% of metabolite variation was related to 6-benzylaminopurine treatment, and overall metabolomics profiles between the 6-benzylaminopurine and control groups were clearly discriminated. Forty-six metabolites identified by the PLS-DA model were responsible for responding to 6-benzylaminopurine. Metabolic analysis showed that 6-benzylaminopurine could accelerate the rate of utilization of glucose in Aurantiochytrium sp. YLH70, and the metabolic flux from glycolysis, TCA cycle and mevalonate pathway to fatty acids biosynthesis was promoted. Moreover, the anti-stress mechanism in Aurantiochytrium sp.YLH70 might be induced by 6-benzylaminopurine. CONCLUSION Metabolomics is a suitable tool to discover the metabolic mechanism for improving lipid and DHA accumulation in a microorganism. 6-benzylaminopurine has the potential to stimulate lipid and DHA production of Aurantiochytrium sp.YLH70 for industrial purposes. © 2015 The Authors. Journal of Chemical Technology & Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
研究领域:
生物化学
·
海洋生物学
✓ 已验证
DOI
PubMed
高影响因子
Toxics
·
2023
·Vol. 11
·期 10
·803
·
IF 4.6
Chengzhi Li,Yuxi Feng,Peng Tian,Xiaozhang Yu
The accumulation of proline impacts the defense mechanisms of plants against the harmful effects of adverse environmental conditions; however, its concentration in plants is associated with the metabolism of N. Therefore, the effects of exogenous organic [glutamate (Glu)/arginine (Arg)] and inorganic [nitrate (NO3−)/ammonium (NH4+)] N on the accumulation of proline (Pro) in rice plants under trivalent chromium [Cr(III)] stress were studied through using the mass balance matrix model (MBMM). Application of ‘NH4+’ showed the largest contribution to the Pro content in rice shoots under different concentrations of Cr(III), followed by ‘NO3−’, ‘Arg’, and ‘Glu’ applications. On the other hand, ‘Arg’ application displayed the largest contribution to the Pro content in roots under Cr(III) stress, followed by ‘NH4+’, ‘Glu’, and ‘NO3−’ applications. The combined application of ‘NH4++Arg’ showed the greatest contribution to the Pro content in both roots and shoots of Cr(III)-treated rice seedlings, while the application of ‘NO3−+Glu’ showed the least contribution to the Pro content in rice seedlings. The current study indicated that the endogenous level of Pro in rice seedlings is quite sensitive to Cr(III) stress under different N sources, and the mathematical modeling showed a reliable result while estimating the relationship between Pro content and N source application.Keywords:proline;rice;trivalent chromium;nitrogen source;mass balance
研究领域:
植物生理学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2022
·
IF 3.898
Zhaofeng Zhang,Juanjuan Ding,Min Wu,Bochao Liu,Huiwen Song,Shengping You,Wei Qi,Rongxin Su,Zhimin He
γ-Aminobutyric acid (GABA), a natural non-protein amino acid, plays an irreplaceable role in regulating the life activities of organisms. Nowadays, the separation and purification of food-grade GABA from fermentation broth is still a great challenge. This research utilized monosodium glutamate as a substrate for the production of high-purity GABA via an integrated process incorporating fermentation, purification, and crystallization. Firstly, 147 g·L −1 GABA with a yield of 99.8% was achieved through fed-batch fermentation by Lactobacillus brevis CE701. Secondly, three integrated purification methods by ethanol precipitation were compared, and crude GABA with a purity of 89.85% was obtained by the optimized method. Thirdly, GABA crystals with a purity of 98.69% and a yield of 60% were further obtained through a designed crystallization process. Furthermore, the GABA industrial production process model was established by Superproper Designer V10 software, and material balance and economic analysis were carried out. Ethanol used in the process was recovered with a recovery of 98.79% through Aspen simulated extractive distillation. Then the fixed investment (equipment purchase and installation costs) for an annual production of 80 t GABA will be about 833000 USD; the total annual production cost (raw material cost and utility cost) will be about 641000 USD. The annual sale of GABA may be at the range of 2400000–4000000 USD and the payback period will be about 1–2 year. This integrated process provides a potential way for the industrial-scale production of food-grade GABA.
研究领域:
生物工程
·
食品科学
✓ 已验证
DOI
高影响因子
Chem Catalysis
·
2025
·
IF 11.6
Yingxin Ma,Xuyun Guo,Wenfang Yuan,Peinuo Yang,Yu Zhang,Wenxuan Chen,Lejuan Cai,Valeria Nicolosi,Wenlong Wang,Yang Chai,Bocheng Qiu
Electrochemical upcycling of nitrate (NO 3 − ) wastewater to ammonia offers a sustainable route for reclaiming nitrogen resources from waste. However, its practical implementation still faces substantial obstacles, including high energy input and limited selectivity. Here, we report a paired electrochemical system that combines the anodic oxidation of polyethylene terephthalate (PET) hydrolysate, specifically its ethylene glycol (EG) monomer, to glycolic acid (GA) with the cathodic reduction of NO 3 − to ammonia. All of this is made possible by the discovery of a PdCu alloy anode and a CuCo alloy cathode. Built upon experimental demonstration and a theoretical understanding of the improved CO resistance on the PdCu alloy for EG oxidation, as well as the synergy between Cu and Co for NO 3 − reduction, our paired system enables the efficient co-production of GA and ammonia from PET hydrolysate and NO 3 − -containing wastewater. This conceptual design of paired electrochemistry provides an intriguing way to synthesize high-value chemicals from waste resources.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 9
·6168-6177
·
IF 2.779
Chen Pu,Zhao Zhihua,Shao Zhigang,Tian Ye,Li Bo,Huang Bo,Zhang Shuaiwen,Liu Chunbo,Shen Xiaoqing
Semiconducting nanomaterials with different sizes and shapes have wide applications in the field of electronics, and one of the key pathway to improve their performance is by recombination of different materials. In our innovative work, the nanocomposites of polypyrrole (PPy) and MXene were prepared by a simple in situ polymerization reaction. The samples were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). The samples were made into sensors, and the gas sensitivities of the materials were investigated under different test conditions. The results showed that the response value of PPy/MXene-12 sensor to 100 ppm ammonia at room temperature was 2.38 times than that of pure PPy and 6.38 times than that of pure MXene. In addition, the sensor has excellent selectivity and low detection limit, which demonstrate the excellent practicability of them in the field of Internet of Things (IoT).
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Chemistry-An Asian Journal
·
2020
·Vol. 15
·期 8
·1272-1276
·
IF 4.056
Yueming Cao,Peipei Li,Tengteng Wu,Meiling Liu,Youyu Zhang
Graphical HKUST-1 (Cu−BTC, BTC=benzene-1,3,5 tricarboxylate) was selected as an electrocatalyst for the reaction of conversion N 2 to NH 3 under ambient conditions. At −0.75 V vs. reversible hydrogen electrode, it achieves excellent performance with high NH 3 yield (46.63 μg h −1 mg −1 cat. or 4.66 μg h −1 cm −2 ) and Faraday efficiency (2.45%). Electrolytic ammonia synthesis from nitrogen at ambient conditions is appearing as a promising alternative to the Haber-Bosch process which is consuming high energy and emitting CO 2 . Here, a typical MOF material, HKUST-1 (Cu−BTC, BTC=benzene-1,3,5-tricarboxylate), was selected as an electrocatalyst for the reaction of converting N 2 to NH 3 under ambient conditions. At −0.75 V vs. reversible hydrogen electrode, it achieves excellent catalytic performance in the electrochemical synthesis of ammonia with high NH 3 yield (46.63 μg h −1 mg −1 cat. or 4.66 μg h −1 cm −2 ) and good Faraday efficiency (2.45%). It is indicated that the good performance of the HKUST-1 catalyst may originate from the formation of Cu(I). In addition, the catalyst also has good selectivity for N 2 to NH 3 .
研究领域:
材料科学
·
电化学
·
催化反应
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Yu Tan,Yike Wei,Gaigai Liu,Yuhang Cai,Siyu Liu,Shijie Wang,Shenghan Zhang,Kexin Liang
The mild reaction conditions, simple process, and clean raw materials make electrochemical nitrogen reduction reaction to ammonia (NRR) a promising method for producing this crucial substance for human life. The proposed catalysts have been shown to reduce the reaction barrier and improve catalytic efficiency, making them an excellent choice for this process. Carbon nanotubes coated FeMoO 4 (FeMoO 4 @CNTs) nanorods are a highly efficient catalyst for fixing N 2 to NH 3 . Carbon nanotubes doped FeMoO 4 improve the efficiency of electrocatalytic NRR by increasing their active surface. A superior ammonia yield of 18.49 μg h −1 ·mg·cat −1 at −0.65 V was obtained in a 0.1 mol L −1 Na 2 SO 4 solution, with a corresponding Faraday efficiency of 16.14%. The response of the experimental system to environmental factors was also investigated. The data clearly indicates that raising the temperature does not enhance the yield of ammonia. This reaction system is optimal for neutral or alkaline environments.
研究领域:
化学
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Genetics and Genomics
·
2024
·
IF 6.6
Xiaoya Zhang,Abhisek Bhattacharya,Chunxiang Pu,Yan Dai,Jia Liu,Lang Rao,Chaoguang Tian
Histone citrullination, an important post-translational modification mediated by peptidyl arginine deiminases, is essential for many physiological processes and epigenetic regulation. However, the causal relationship between histone citrullination and specific gene regulation remains unresolved. In this study, we develop a programmable epigenetic editor by fusing the peptidyl arginine deiminase PPAD from Porphyromonas gingivalis with dCas9. With the assistance of gRNA, PPAD-dCas9 can recruit peptidyl arginine deiminases to specific genomic loci, enabling direct manipulation of the epigenetic landscape and regulation of gene expression. Our citrullination editor allows for site-specific manipulation of histone H3R2,8,17 and 26 at target human gene loci, resulting in the activation or suppression of different genes in a locus-specific manner. Moreover, the epigenetic effects of the citrullination editor are specific and sustained. This epigenetic editor offers an accurate and efficient tool for exploring gene regulation of histone citrullination.
研究领域:
表观遗传学
·
分子生物学
·
基因组学
·
生物技术
✓ 已验证
DOI
PubMed
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2016
·
IF 2.725
Jie Zhang,Ningyu Chen,Yuheng Cui,Liqun Zhang,Dongmei Yue
In this study, novel 1-methylpropargyl alcohol derivatives containing leucine side groups on their side chains were successfully synthesized and polymerized using (nbd)Rh + [η 6 -C 6 H 5 B − (C 6 H 5 ) 3 ] as catalyst. Circular dichroism (CD) and ultraviolet–visible (UV–Vis) spectra revealed that the polymers took predominantly one-handed helical structures that were stable under heat. Deprotection of the t-butyloxycarboryl (Boc) groups in the homopolymers under acidic conditions produced polymers with primary amine moieties on the side chains. The polymers were soluble in aqueous medium, and turbidity test revealed that they were pH-responsive. Amino acid-based polymers were further used in the enantionselective crystallization of alanine enantiomers and l -alanine was preferably induced to crystallize with the l -leucine-based polymer.
研究领域:
高分子化学
·
手性分离
·
药物结晶
·
功能材料
·
生物材料
·
有机合成
✓ 已验证
DOI
高影响因子
TALANTA
·
2018
·
IF 4.244
Wenya Feng,Juan Qiao,Junfang Jiang,Bingbing Sun,Zhiwei Li,Li Qi
Alanine aminotransferase (ALT) plays significant role in biological and clinical research. In this study, a unique ALT enzyme reactor based on multifunctional polymer@magnetic nanoparticles has been constructed for the first time and the enzymolysis efficiency has been evaluated by chiral ligand exchange capillary electrophoresis technique. Poly(N-acryloxysuccinimide) has been synthesized by reversible addition-fragmentation chain transfer polymerization method and immobilized on the magnetic nanoparticles via the succinimide group in the polymer. Interestingly, the enzyme also could easily react with the succinimide group, which enables of ALT covalent bonding onto the polymer. The enzyme amount immobilized and the immobilization time have been investigated. Comparing with free ALT in solution ( V max of free enzyme = 0.6 mM min −1 ), the resultant enzyme reactor has exhibited good reusability and stability, and displayed about five times enhanced enzymolysis efficiency with L-alanine as the substrate ( V max of enzyme reactor = 3.4 mM min −1 ). Furthermore, the prepared enzyme reactor has been applied in ALT inhibitors screening. The enzyme reactors based on the multifunctional polymer@magnetic nanoparticles have depicted great potential in anti-liver drugs development, liver diseases study and ALT related biological process inspect.
研究领域:
生物化学
·
药物开发
·
临床研究
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Hongjun Zang,Yimo Feng,Jing Lou,Kai Wang,Changchun Wu,Zhipeng Liu,Xi Zhu
Ionic liquids have shown good catalytic performance and been widely used in the biomass conversion process due to their unique properties, including environmental friendship, low toxicity, and simple preparation. In this work, a series of novel piperidinium-based ionic liquids were synthesized under mild conditions via a simple protonation reaction or nucleophilic substitution reaction. Among them, 4,4′-(propane-1,3-diyl)bis(1-(carboxymethyl)piperidin-1-ium) chloride ([PDCMPi]Cl) displayed the best catalytic performance. The highest yield (42.81 %) of 3A5AF from NAG was obtained after reacting in N-methyl-pyrrolidone (NMP) in the presence of piperidinium-based ionic liquids at 180 °C for 20 min under normal atmospheric conditions. Additionally, ionic liquid [PDCMPi]Cl showed good catalytic activity in six repeated catalytic runs. Meanwhile, a possible reaction pathway was also proposed on the basis of the results of NMR spectra.
研究领域:
催化化学
·
绿色化学
·
生物质能源
·
有机合成
·
离子液体化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）