MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
·
2022
·Vol. 73
·期 7
·1153-1162
·
IF 1.832
Cunhua Wei,Ge Xu,Jin Yu
A novel triazine derivative, 2, 4-diamino-6-dodecamido-1, 3, 5-triazine (DT), is synthesized by the dehydration condensation of melamine and lauric acid, and its inhibitive performances for the corrosion of Q235 carbon steel in 1 mol/L HCl solution is investigated by electrochemical polarization, electrochemical impedance spectroscopy, scanning electron microscopy, and atomic force microscope. The results reveal that its best inhibition efficiency reaches 96.98% at a concentration of 2.5 g/L. The calculation results of kinetic and thermodynamic parameters indicate that the adsorption of DT on carbon steel surface obeys Langmuir adsorption isotherm with both physical and chemical adsorption. It is demonstrated that long-chain amide (>8C) substituted 1, 3, 5-triazine derivative has the synergistic corrosion inhibition effect of the surface fixation on metal iron and the hydrophobic adsorption layer.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2023
·
IF 6.8
Cuiping Li,Mengfan Pang,Yaping Li,Lirong Han,Yajiao Fan,Xuelian Xin,Xian Zhang,Ning Zhang,Yan Qin
Tetrachlorobenzoquinone (TCBQ) is an active metabolite of pentachlorophenol, and stimulates the accumulation of ROS to trigger apoptosis. The preventive effect of vitamin C (Vc) against TCBQ-induced apoptosis in HepG2 cells is unknown. And there is little known about TCBQ-triggered 5-hydromethylcytosine (5hmC)-dependent apoptosis. Here, we confirmed that Vc alleviated TCBQ-induced apoptosis. Through investigating the underlying mechanism, we found TCBQ downregulated 5hmC levels of genomic DNA in a Tet-dependent manner, with a particularly pronounced decrease in the promoter region, using UHPLC-MS-MS analysis and hydroxymethylated DNA immunoprecipitation sequencing. Notably, TCBQ exposure resulted in alterations of 5hmC abundance to ∼91% of key genes at promoters in the mitochondrial apoptosis pathway, along with changes of mRNA expression in 87% of genes. By contrast, 5hmC abundance of genes only exhibited slight changes in the death receptor/ligand pathway. Interestingly, the pretreatment with Vc, a positive stimulator of 5hmC generation, restored 5hmC in the genomic DNA to near-normal levels. More notably, Vc pretreatment further counter-regulated TCBQ-induced alteration of 5hmC abundance in the promoter with 100% of genes, accompanying the reverse modulation of mRNA expressions in 89% of genes. These data from Vc pretreatment supported the relationship between TCBQ-induced apoptosis and the altered 5hmC abundance. Additionally, Vc also suppressed TCBQ-stimulated generation of ROS, and further increased the stability of mitochondria. Our study illuminates a new mechanism of TCBQ-induced 5hmC-dependent apoptosis, and the dual mechanisms of Vc against TCBQ-stimulated apoptosis via reversely regulating 5hmC levels and scavenging ROS. The work also provided a possible strategy for the detoxification of TCBQ.
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高影响因子
SENSORS
·
2021
·Vol. 22
·期 1
·64
·
IF 3.576
Yuzhen Li,Juanhua Zhang,Mengxiao Lv,Yihui Bai,Xuexiang Weng,Chunping You,Zhenmin Liu
The concentration of 5-hydroxymethyl-2-furfural (HMF) is an important quality-related index in milk and milk products. Fast, cost-effective and environmentally friendly determination of HMF is of great significance in milk products control. In this study, a three-dimensional (3D) graphene-like surface (3DGrls) was successfully prepared within 5 min by an electrochemical amperometric pretreatment on a pencil graphite electrode (PGE). The fast-obtained 3D graphene-like surface increased the electrode surface area and enhanced the electron transfer capability without the addition of any harmful chemicals. The morphology and chemical composition of the obtained electrode were characterized by scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and electrochemical impedance spectroscopy (EIS). The results found that the electrochemical response to HMF at the prepared 3DGrls/PGE was 34 times higher than that at PGE. The modified electrode showed a good linear response to HMF in a concentration range of 0.35~116 μM with a low limit of detection (LOD) of 0.099 μM. The integrated electrode also exhibited excellent stability and wonderful antifouling property. Furthermore, the 3DGrls/PGE was successfully applied for the determination of HMF in three processed cheese samples with satisfactory results.Keywords:5-hydroxymethyl-2-furfural;pencil graphite electrode;three-dimensional graphene-like surface;sensor;processed cheese
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Food Bioscience
·
2023
·
IF 5.2
Zening Zhang,Peng Deng,Yang Chen,Zhiyong He,Fang Qin,Qiuming Chen,Zhaojun Wang,Jie Chen,Maomao Zeng,Hongyang Pan
The current study examined the impact of different amino acids and heating durations on the levels of 4-MI and 5-HMF in caramel colors. At the 30-min mark, the 3:1 mass ratio (with a 0.2% addition) of the Cys-Pro combination inhibited 4-MI and 5-HMF by 20.33% and 18.39%, respectively. At 60 and 90 min, the 1:3 mass ratio (with a 1% addition) of the Cys-Pro combination yielded inhibition rates of 31.33% and 8.64% for 4-MI and 31.75% and 22.52% for 5-HMF within the caramel colors. The Cys-Pro mass ratios of 1:1, 1:3, and 3:1 demonstrated peak inhibition rates of 81.63%, 86.28%, and 86.57% against MGO , respectively. The most effective inhibition against 3-DG was achieved with a 30-min heating duration and a 1:3 mass ratio (with a 1% addition) of the Cys-Pro combination, resulting in a 14.21% inhibition rate. Notably, in a model system, cysteine also exhibited significant inhibitory effects against MGO. Additionally, ESR measurements revealed that amino acid combinations can effectively eliminate the free radicals generated during the caramelization process.
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FUEL
·
2023
·
IF 7.4
Xin-Bo Pang,Jing-Pei Cao,Nai-Yu Yao,Jing-Ping Zhao,Tian-Long Liu,Shi-Jie Cai,Hong-Yan Wang,Yan-Cheng Hu,Xiao-Yan Zhao
A series of HZSM-5 with hierarchical pores was obtained by using a modified NaOH treatment method. This modification incorporated the use of tetrapropylammonium bromide. Furthermore, their catalytic performance for reforming of cellulose pyrolysis volatiles at 600 °C was investigated. TPAB-assisted alkali treatment increased the mesoporosity, relative crystallinity, and surface integrity of ZSM-5. Additionally, a significant portion of the acidic sites was preserved. The 0.1TPAB-0.2AT, treated with 0.1 M TPAB and 0.2 M NaOH, yielded the highest light aromatics at 156.9 mg/g. The coking resistance of the catalyst was also improved. Tetrapropylammonium (TPA + ) achieves surface protective desilication by selectively adsorbing Si(0Al) on the zeolite. Subsequently, the continuous adsorption of TPA + leads to mesopore formation within the zeolite. This continuous restriction on desilication limits the increase in mesopore volume, resulting in a relatively abundant and uniform distribution of smaller mesopores on ZSM-5. This mechanism holds promise for future synthesis of highly mesoporous ZSM-5.
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CATALYSIS COMMUNICATIONS
·
2023
·
IF 3.7
Shuolin Zhou,Jian Liu,Sha Wen,Li Yang,Qiong Xu,Dulin Yin,Xianxiang Liu
2,5-Diformylfuran (DFF), arising as an oxidation product of 5-hydroxymethylfurfural (HMF), has garnered significant interest owing to its versatile range of applications. In this study, the desired catalyst of NH 4 V 3 O 8 /N-C was successfully prepared and investigated by various characterization methods. A systematic effect of reaction conditions was conducted, revealing that under 5 bar of oxygen pressure, DFF was synthesized from HMF selective oxidation using the NH 4 V 3 O 8 /N-C catalyst. This transformation was achieved within 2 h at 120 °C, exhibiting an impressive DFF selectivity of 97.8%. During the recycling experiment, the catalytic efficiency remained consistently high even after being employed for eight cycles.
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FUEL
·
2023
·
IF 7.4
Yuheng Qiao,Zhenzhen Guan,Mengyan Zhang,Gan Chen,Shifeng Zhou,Hailong Liu,Jiang Wu,Ruitang Guo,Weiguo Pan,Fangqin Li,Ping He
In this paper, a series of Fe-based catalysts with Zeolite Socony Mobil-5 (ZSM-5) as supports were synthesized using the sol–gel method to obtain the Fe/ZSM-5, Mn-Fe/ZSM-5, Cu-Fe/ZSM-5 and Cu-Mn-Fe/ZSM-5 catalysts. The synthesized catalysts were examined and characterized via catalytic activity testing, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), N 2 adsorption/desorption, scanning electron microscope (SEM), temperature-programmed desorption of NH 3 (NH 3 -TPD), temperature-programmed reduction with H 2 (H 2 -TPR) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The results showed that the Cu-Mn-Fe/ZSM-5 catalyst had the best catalytic performance compared with the other catalysts. In addition, Fe/ZSM-5 and Cu-Mn-Fe/ZSM-5 all exhibited excellent stability as well as good tolerance to SO 2 & H 2 O under the experimental conditions. Further characterization results showed that with co-doping of Cu and Mn, the amount of Mn 4+ , Cu + , Fe 3+ and surface chemisorbed oxygen (O β ) on the surface of Fe/ZSM-5 increased, promoting the catalytic performance. The DRIFT studies revealed that the NH 3 -SCR reaction followed both the E-R and L-H mechanism on the surface of the Fe-based ZSM-5 catalyst. The Fe-based ZSM-5 catalyst is a good candidate for NH 3 -SCR both in high reactivity and outstanding stability.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2023
·
IF 4.3
Guona Li,Qingya Yang,Xiaoying Liu,Lvcheng Liu,Junshan Han,Xing Li
A very poisonous heavy metal Cd 2+ not only contaminates the living environment but also constitutes a serious menace to human health through water intake and food chains. Thus, monitoring and controlling the content of Cd 2+ with rapidity, sensitivity, and simplicity in tap water, soil, and rice samples is important especially. In the work, a high-efficiency sensor based on gold nanoparticles (AuNPs) embellished and refined with 3-(1H-Tetrazol-5-yl) aniline (TAA) for the colorimetric detection of Cd 2+ is rationally put forward. The interaction between Cd 2+ and TAA@AuNPs leads to the agglomeration of the AuNPs solutions, resulting in the color of the system changing from wine-red to gray-blue. The limit of detection (LOD) of the sensor is 1.0 μM when observe with the unaided eye, and UV–vis spectroscopy also has a LOD of 31 nM with an excellent linear relationship ( R 2 = 0.99049) in the concentration range of 0.0–8.0 μM for Cd 2+ , indicating that AuNPs modified with TAA can be effectively used for the quantitative determination of Cd 2+ . Furthermore, the colorimetric sensor has been tested on tap water, soil, and rice samples, and it shows promising potential for the practical monitoring of harmful Cd 2+ in environmental systems.
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MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Ziying Zhong,Yun Tang,Yanran Chen,Chunfang Wang,Faqiong Zhao,Baizhao Zeng
The widespread use of tetracycline unavoidably causes residue problems, hence its monitor in foods and environment is important. In this work, a simple but sensitive electrochemiluminescence (ECL) sensor is prepared for tetracycline detection. The sensor is constructed using TiO 2 nanoparticle, ZIF-5 loaded Ru(bpy) 3 2+ (Ru@ZIF-5), and molecularly imprinted poly-o-phenylenediamine. The TiO 2 NP acts as a co-reaction accelerator for tri-n-propylamine (TPrA) by producing electrons and holes at a certain potential to promote the production of TPrA . ZIF-5 has a large specific surface area and rich functional groups, thus can well immobilize a large amount of illuminant Ru(bpy) 3 2+ . The electrodeposited molecularly imprinted polymer acts as a recognition element. Due to the synergic effect of different components, the resulting ECL sensor shows a wide linear range of 10 nM–50 μM, high selectivity, low detection limit, and good stability. It can be used for the detection of tetracycline in food and environmental samples.
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PHYTOCHEMISTRY
·
2023
·
IF 3.8
Hao-Dong Yang,Zhi-Shu Tang,Tao-Tao Xue,Huai-Li Xu,Bao-Long Hou,Ya-Ya Zhu,Zeng-Hu Su,Hong-Bo Xu
Twenty-four monoterpenoids , including three previously undescribed compounds ( 1 – 3 ), were isolated from the root bark of Acanthopanax gracilistylus W. W. Smith ( Acanthopanacis Cortex ). Their structures were unambiguously established based on spectroscopic analysis (HR-ESIMS, IR, 1D, and 2D NMR), and the absolute configurations of 1 – 3 were elucidated by comparing their experimental and calculated electronic circular dichroism spectra. In addition, the structure of 8 was confirmed by single-crystal X-ray diffraction. The inhibitory activities of 1 – 24 against neutrophil elastase , 5-lipoxygenase, and cyclooxygenase-2 (COX-2) were studied in vitro for the first time, and the results showed that compound 24 possessed a significant inhibitory effect on COX-2 with an IC 50 value of 1.53 ± 0.10 μ Μ. This research first reported the presence of monoterpenoids in Acanthopanacis Cortex , including one monoterpenoid 2 with an unusual 4/5 bicyclic lactone system, and compounds 4 and 5 have never been reported in nature.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Bing Liu,Ke Sha,Meng Fei Zhou,Kai Xin Song,Yu Hui Huang,Cheng Chao Hu
Two novel low- ε r gallates MGa 2 O 4 (M = Ca, Sr) have been synthesized via a standard solid-state reaction method. According to the X-ray diffraction results, CaGa 2 O 4 crystallizes in space group Pna2 1 with an orthorhombic symmetry, while SrGa 2 O 4 belongs to the monoclinic P2 1 / c system. Both ceramics show ever-improving microstructures with the increasing sintering temperature . The optimal microwave dielectric properties ( ε r = 9.2, Qf = 66,000 GHz, τ f =–85 ppm/°C for SrGa 2 O 4 and ε r = 10.6, Qf = 15,400 GHz, τ f =–58 ppm/°C for CaGa 2 O 4 ) are obtained when sintered at 1275 °C. A patch antenna is fabricated using SrGa 2 O 4 ceramics as the substrate, which realizes a return loss of –19.94 dB and total efficiency of –1.38 dB (72.8 % in power ratio) at 4.84 GHz. The exceptional performances indicate that SrGa 2 O 4 ceramics are promising candidates for antenna applications at the Sub-6 GHz band.
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 4
·1-13
·
IF 5.833
Yang Qiaoli,Deng Sangsang,Xu Jingjing,Farooq Umer,Yang Taotao,Chen Wei,Zhou Lei,Gao Meiying,Wang Shenqi
Yersinia pseudotuberculosis is an enteric bacterium causing yersiniosis in humans. The existing Yersinia pseudotuberculosis detection methods are time-consuming, requiring a sample pretreatment step, and are unable to discriminate live/dead cells. The current work reports a phage-based electrochemical biosensor for rapid and specific detection of Yersinia pseudotuberculosis . The conductive poly(indole-5-carboxylic acid), reduced graphene oxide, and gold nanoparticles are applied for surface modification of the electrode. They possess ultra-high redox stability and retain 97.7% of current response after performing 50 consecutive cycles of cyclic voltammetry.The specific bacteriophages vB_YepM_ZN18 we isolated from hospital sewage water were immobilized on modified electrodes by Au-NH 2 bond between gold nanoparticles and phages. The biosensor fabricated with nanomaterials and phages were utilized to detect Yersinia pseudotuberculosis successfully with detection range of 5.30 × 10 2 to 1.05 × 10 7 CFU mL −1 , detection limit of 3 CFU mL −1 , and assay time of 35 min. Moreover, the biosensor can specifically detect live Yersinia pseudotuberculosis without responding to phage-non-host bacteria and dead Yersinia pseudotuberculosis cells. These results suggest that the proposed biosensor is a promising tool for the rapid and selective detection of Yersinia pseudotuberculosis in food, water, and clinical samples.
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