JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2013
·Vol. 299
·期 3
·1509-1515
·
IF 1.467
Liu Zhen-feng,Wang Guo-lin,Dong Meng-jie,Jin Jian-wen,Li Jia-jun,Zhang Qian,Zhao Kui,Yang Shu-ye,Lin Xiang-tong
The preparation of 10-(2-[ 18 F]fluoroethoxy)-20( S )-camptothecin, a potential positron emission tomography tracer for the imaging of topoisomerase I in cancers, is described. 10-(2-[ 18 F]Fluoroethoxy)-20( S )-camptothecin was synthesized by the [ 18 F]fluoroalkylation of the corresponding hydroxy precursor molecule with 2-[ 18 F]fluoroethyl bromide ([ 18 F]FEtBr) in dimethylsulfoxide (DMSO) at 55 °C for 20 min; this was followed by purification using high performance liquid chromatography (HPLC) with a total preparation time of 60 min. The overall radiochemical yield was approximately 5.4–12 % (uncorrected), and the radiochemical purity was above 96 %.
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GREEN CHEMISTRY
·
2014
·Vol. 16
·期 5
·2762-2770
·
IF 6.852
Zehui Zhang,Bing Liu,Kangle Lv,Jie Sun,Kejan Deng
In this study, we have successfully prepared a heterogeneous catalyst (K-10 clay-Mo) by the immobilization of bis(acetylacetonato) dioxo-molybdenum(VI) [MoO2(acac)2] on montmorillonite K-10 clay. The structure of the resultant catalyst was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electronic microscopy (TEM), and Fourier transform infrared (FTIR) spectroscopy. The catalytic activity of K-10 clay-Mo was tested in the aerobic oxidation of 5-hydroxymethylfurfural (HMF). Although a molecule of HMF contains one hydroxyl group and one aldehyde group, to our surprise, the catalyst showed high catalytic activity for the oxidation of the aldehyde group of HMF into 5-hydroxymethyl-2-furancarboxylic acid (HMFCA). A variety of important reaction parameters such as the reaction temperature, catalyst amount, and solvent were explored. HMFCA could be obtained in a high yield of 86.9% with a HMF conversion of 100% after a short reaction time of 3 h in toluene. More importantly, the catalyst K-10 clay-Mo could be reused several times without a significant loss of its catalytic activity.
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Journal of Physical Chemistry C
·
2013
·
IF 4.814
Geng Zhang,Zhi-Gang Shao,Wangting Lu,Hui Xiao,Feng Xie,Xiaoping Qin,Jin Li,Fuqiang Liu,Baolian Yi
Sub 10 nm Pdcore@Ptshell nanocrystals (NCs) were prepared by a facile and green reduction method in aqueous solutions using commercially available and nontoxic poly(ethylene oxide)–poly(propylene oxide)–poly(ethylene oxide) amphiphilic triblock copolymers as the reductant, stabilizer, and capping agent. The growth mode and morphology of the Pt shell on the Pd surface can be adjusted simply by the Pt/Pd molar ratio. The activity of carbon-supported Pd@Pt NCs toward oxygen reduction reaction exhibited a Pt shell morphology dependence, with Pd2@Pt1 (Pt/Pd molar ratio 1/2) having the highest mass activity and Pd1@Pt2 (Pt/Pd molar ratio 2/1) having the best area-specific activity, and both of them were significantly enhanced in comparison with that of commercial Pt/C catalysts. Moreover, single-fuel-cell testing indicated superior activity and durability of Pd2@Pt1 NCs, which made Pd2@Pt1 NCs promising cathode catalysts for fuel cell applications.
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Journal of Materials Chemistry C
·
2025
·
IF 5.1
Junhui Wu,Baoping Yang,Jiahao Zhou,Ming Zhong,Yong Ding,kun zhao,Ye Yuan
Triboelectric nanogenerators (TENGs) are capable of effectively scavenging ambient tiny mechanical energy and converting it into electrical energy, offering significant potential for applications in self-powered sensing and electrical energy storage systems. However, the practical utility of TENGs in high-humidity environments is severely restricted due to the detrimental effects of moisture. Herein, we have fabricated a TENG utilizing a CAU-10-(SO3H)0.08(OH)0.92/polyvinyl chloride (PVC) composite film as the negative triboelectric layer and Al foil as the positive triboelectric layer, which exhibits the ability to sustain stable output voltage and current even in highly ambient humidity conditions. At a relative humidity (RH) of 20%, the 2 wt%-CAU-10-(SO3H)0.08(OH)0.92//PVC composite film-based TENG achieved an open-circuit voltage (Voc) of 318 V, a short circuit-current (Isc) of 30 μA, a short-circuit charge transfer (Qsc) of 77 nC and a peak power of 2.69 mW. The device still maintains stable output voltage and current signals even at 90% RH. There is no obvious decline in the output voltage of the TENG after continuous working for about 36,000 operational cycles. Through a transformer and a rectifier circuit, the TENG was capable of charging a 10 mF capacitor to 2.7 V in 3.48 h, which was subsequently employed for water electrolysis to generate hydrogen. After 30 electrolysis cycles, the system produced 54 µL of H2 at a rate of 143.6 µL/h/m². This work offers a reference for the development of CAU-10-(SO3H)0.08(OH)0.92-based composites with humidity resistance, which is essential for the application of TENGs in high-humidity environments.
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NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 24
·10873-10883
·
IF 2.7
Yunxia Shi,Hui Duan,Meiyan Du,Xia Kong,Ke Xue,Guang Lu,Qingyun Liu
In this work, 2(3),9(10),16(17),23(24)-octamethoxyphthalocyanine (Pc(OH)8) was first used to modify Cu/CuFe2O4(Cu/CFO) nanospheres, and Pc(OH)8–Cu/CFO nanocomposites with enhanced peroxidase mimetic enzyme activity was obtained compared to the performance of Cu/CFO alone. SEM, XRD, and XPS were used to study the surface morphology, phase composition and elemental analysis of the newly synthesized Pc(OH)8–Cu/CFO. Using TMB as the chromogenic substrate, Pc(OH)8–Cu/CFO accelerate the oxidation process of chromogenic substrate 3,3′,5,5′- tetramethylbenzidine (TMB) by hydrogen peroxide in three minutes. The catalytic oxidation mechanism of Pc(OH)8–Cu/CFO on TMB was comprehensively investigated through free radical and fluorescence probe experiments. Based on the excellent catalytic performance of the composite materials, a simple and fast colorimetric sensing platform for the colorimetric detection of H2O2 and glutathione (GSH) was constructed in the range of 0.6–5 mM and 2–10 μM with detection limits (LODs) of 0.35 mM and 0.55 μM, respectively. In addition, using Pc(OH)8–Cu/CFO colorimetric detection for GSH has a lower detection limit, good selectivity and high sensitivity, which is expected to become an ideal material for GSH colorimetric detection.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Xiaodan Wu,Chengdong Nie,Mengqiong Deng,Linan Sun,Ying Wang,Jingru Zhao,Yujie Fu,Yourong Duan,Ying Sun
In this study, natural polysaccharides were first modified to synthesize natural functional monomers (NFMs). Subsequently, a natural novel NFM-based imprinted hydrogel microsphere was prepared for the specific recognition and enrichment of 7-xylulose-10-deacetylpaclitaxel (7-X-10-DTA). Molecular dynamics computational simulations were employed to screen and compare the functional monomers. Subsequently, the optimal preparation and application conditions of NMIHM were determined, with a maximum adsorption capacity of 71.77 mg mL −1 . The adsorption behavior of NMIHM for 7-X-10-DTA conforms to the pseudo-second-order kinetic model and the Langmuir model for monolayer adsorption, representing a spontaneous exothermic process. When used as a solid-phase extraction filler, NMIHM increased the content of 7-X-10-DTA by 13.36 times after enrichment in Taxus × media Rehde. The 7-X-10-DTA extracted in this study exhibited low half-maximal inhibitory concentration (IC50) values of 0.3205 μM and 0.7636 μM against cervical cancer Hela cells and prostate cancer PC-3 cells, respectively, demonstrating a more potent killing effect on these two types of cancer cells. This research is expected to accelerate the research and development of natural functional monomers and the advancement of molecular imprinting technology, thereby promoting the rapid development of practical separation applications.
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Innovative Food Science & Emerging Technologies
·
2024
·
IF 6.3
Xiya Zhang,Aixia Wang,Jiaxin Li,Yimeng Shan,Xue Gong,Hanlin Yao,Wenling Zhou,Manxing Wang,Bangqi Liang,Fengzhong Wang,Li-Tao Tong
Pickled bamboo shoots represent a type of fermented bamboo shoot product. In China, pickled bamboo shoots are regarded as the soul of Luosifen, which is a local specialty food in Liuzhou (Guangxi Zhuang Autonomous Region, China). To exemplify the uniqueness of the pickled bamboo shoots, we analyzed the pickled bamboo shoots within 10 pre-packaged Chinese Luosifen to determine the composition of volatiles and bacteria, and subsequently examined the correlation between them. The volatiles were identified using gas chromatography–mass spectrometry (GC–MS) and gas chromatography-ion mobility spectrometry (GC-IMS). Meanwhile, high-throughput sequencing technology was employed to investigate the bacterial composition. The results indicated that the pH values of the samples exhibited minimal variance (ranging from 3.71 to 4.53), while the total acid (measured as g lactic acid /L) varied (from 4.65 to 10.3 g lactic acid /L). Lactic acid, acetic acid, and succinic acid were the predominant organic acids. 50 volatiles were detected by HS-GC-MIS, and 108 volatiles were identified by HS-SPME-GC–MS. p -Cresol (76,541.67 < OAV < 248,166.67), acetic acid (482.31 < OAV < 1164.62), and hexanoic acid (108.33 < OAV < 1333.33) were the common distinctive volatiles among the 10 samples. Proteobacteria and Firmicutes, as the dominant phyla, were positively and negatively related to 1-butanol (R = 0.66, − 0.66), respectively. Industrial relevance In China, Luosifen, as a local delicacy, enjoys popularity among the public for its sour, smelly, spicy, fresh, and oily features. Among them, pickled bamboo shoots are highly sought after for their distinctive sour and refreshing flavor. Nevertheless, some individuals cannot tolerate the sour smell of pickled bamboo shoots yet still have a desire to consume Luosifen. To address this issue, it is crucial to determine what constitutes the pungent odor in pickled bamboo shoots and subsequently regulate it to meet the requirements of diverse consumers and enhance the economic benefits of the Luosifen industry. This study disclosed the stimulant flavor substances of pickled bamboo shoots in 10 pre-packaged Luosifen detected by GC–MS and GC-IMS, offering a theoretical foundation for subsequent regulation.
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MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Rongqiao Chen,Wei Chen,Ming Liang,Junpeng Hu,Ruifang Fan,Guoshan He,Yanping Xian
Liquid crystal monomers (LCMs) are emerging environmental contaminants with bioaccumulation potential and health risks. Chinese herbal medicines, susceptible to LCM uptake during cultivation or processing, represent a potential human exposure route. However, reliable methods for analyzing LCMs in these complex matrices are lacking. Herein, a modified QuEChERS method coupled with gas chromatography–tandem mass spectrometry (GC–MS) was developed for the determination of 10 LCMs in herbal medicines. Samples were extracted with dichloromethane and cleaned up using mixed sorbents (N-propyl ethylenediamine and octadecylsilane). The method showed excellent linearity (2.0–200.0 μg/L, r 2 > 0.999), with limits of detection and quantification of 0.5–2.0 μg/kg and 1.0–5.0 μg/kg, respectively. Mean recoveries across three spike levels in different matrices ranged from 75.0% to 112.9%, with relative standard deviations of 2.0–8.5% ( n = 6). In the analysis of 26 real herbal medicines samples, LCMs were detected in mulberry leaf and Salvia miltiorrhiza , indicating a detection frequency of 7.7% and potential contamination in herbal medicines. This reliable and practical method is suitable for routine monitoring of LCM residues in various herbal products.
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Journal of Chemistry
·
2021
·Vol. 2021
·期 1
·5556295
·
IF 2.506
Zongqiang Zhu,Hongqu Yang,Jie Liu,Yinian Zhu,Shen Tang,Lihao Zhang,Xingxing Wang
Basic ferric sulfate-arsenates [FeSAsOH, Fe(SO 4 ) x (AsO 4 ) y (OH) z ·nH 2 O] were prepared and characterized to study their potential fixation of arsenic in the oxidizing and acidic environment through a dissolution for 330d. The synthetic solids were well-shaped monoclinic prismatic crystals. For the dissolution of the sample FeSAsOH–1 [Fe(SO 4 ) 0.27 (AsO 4 ) 0.73 (OH) 0.27 ·0.26H 2 O] at 25–45°C and initial pH 2, all constituents preferred to be dissolved in the order of AsO 4 3− > SO 4 2− > Fe 3+ in 1–3 h, in the order of SO 4 2− > AsO 4 3− > Fe 3+ from 1–3 h to 12–24 h, and finally in the order of SO 4 2− > Fe 3+ > AsO 4 3− . The released iron, sulfate, and arsenate existed dominantly as Fe 3+ /Fe(OH) 2+ /FeSO 4 + , HSO 4 − /SO 4 2− /FeSO 4 + , and H 3 AsO 4 0 /H 2 AsO 4 − , respectively. The higher initial pHs (6 and 10) could obviously inhibit the release of Fe 3+ from solid into solution, and the solid components were released in the order of SO 4 2− > AsO 4 3− > Fe 3+ . The crystal tops were first dissolved, and the crystal surfaces were gradually smoothed/rounded until all edges and corners disappeared. The dissociations were restricted by the Fe-O(H) breakdown in the FeO 6 octahedra and obstructed by the OH − and AsO 4 tetrahedra outliers; the lowest concentration of the dissolved arsenic was 0.045 mg/L. Based on the dissolution experiment at 25°C and pH 2, the solubility products ( K sp ) for the basic ferric sulfate-arsenate [Fe(SO 4 ) 0.27 (AsO 4 ) 0.73 (OH) 0.27 ·0.26H 2 O], which are equal to the ion activity products (logˍIAP) at equilibrium, were calculated to be -23.04 ± 0.01 with the resulting Gibbs free energies of formation (Δ G f o ) of −914.06 ± 0.03 kJ/mol.
研究领域:
化学
·
环境科学
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Lingli Zhang,Chunjuan Huang
The solubility of 2-amino-5-bromopyrazine in the co-solvent mixtures of methanol, ethanol, isopropanol, and propylene glycol (PG) plus water and 10 monosolvents (methanol, ethanol, isopropanol, N,N-dimethylformamide (DMF), n-propanol, n-butanol, acetone, ethylene glycol (EG), PG, and water) was experimentally measured by the isothermal method at 278.15–323.15 K under 101.2 kPa. The temperature dominated the trend of solubility of 2-amino-5-bromopyrazine in pure and mixed solvents, especially high temperatures had a positive effect on dissolution. For the pure solvent system, the maximum solubility was obtained in DMF. For the mixed systems, isopropanol + water was superior to the other three combinations. The Apelblat model, van’t Hoff model, and NRTL model were used to correlate the solubility of 2-amino-5-bromopyrazine in 10 monosolvents. Furthermore, three thermodynamic co-solvency models including the Jouyban–Acree (JA) model, the Van’t Hoff–Jouyban–Acree (VJA) model, and the modified Apelblat–Jouyban–Acree (AJA) model were used to calculate the solubility data. This study would be helpful to the synthesis and purification processes of the final product.
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Signal Transduction and Targeted Therapy
·
2022
·Vol. 7
·期 1
·1-10
·
IF 38.104
Wu Jiajing,Nie Jianhui,Zhang Li,Song Hao,An Yimeng,Liang Ziteng,Yang Jing,Ding Ruxia,Liu Shuo,Li Qianqian,Li Tao,Cui Zhimin,Zhang Mengyi,He Peng,Wang Youchun,Qu Xiaowang,Hu Zhongyu,Wang Qihui,Huang Weijin
Emerging SARS-CoV-2 variants are the most serious problem for COVID-19 prophylaxis and treatment. To determine whether the SARS-CoV-2 vaccine strain should be updated following variant emergence like seasonal flu vaccine, the changed degree on antigenicity of SARS-CoV-2 variants and H3N2 flu vaccine strains was compared. The neutralization activities of Alpha, Beta and Gamma variants’ spike protein-immunized sera were analysed against the eight current epidemic variants and 20 possible variants combining the top 10 prevalent RBD mutations based on the Delta variant, which were constructed using pseudotyped viruses. Meanwhile, the neutralization activities of convalescent sera and current inactivated and recombinant protein vaccine-elicited sera were also examined against all possible Delta variants. Eight HA protein-expressing DNAs elicited-animal sera were also tested against eight pseudotyped viruses of H3N2 flu vaccine strains from 2011–2019. Our results indicate that the antigenicity changes of possible Delta variants were mostly within four folds, whereas the antigenicity changes among different H3N2 vaccine strains were approximately 10–100-fold. Structural analysis of the antigenic characterization of the SARS-CoV-2 and H3N2 mutations supports the neutralization results. This study indicates that the antigenicity changes of the current SARS-CoV-2 may not be sufficient to require replacement of the current vaccine strain.
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PubMed
高影响因子
Food & Function
·
2022
·Vol. 13
·期 19
·9931-9946
·
IF 6.317
Xiyi Hu,Zhenguo Liu,Yuntao Lu,Xuepeng Chi,Kai Han,Hongfang Wang,Ying Wang,Lanting Ma,Baohua Xu
10-Hydroxy-2-decenoic acid (10-HDA) is a principal active ingredients of royal jelly. Several recent studies demonstrated that 10-HDA has potential anti-type 2 diabetes mellitus (T2DM) properties. To evaluate the anti-T2DM effect of 10-HDA and explore its underlying molecular mechanisms, we used high fat diet (HFD) combined with streptozotocin (STZ) injection to establish a diabetes model. Mice were randomly divided into four groups (8 mice per group): control group, 10-HDA group, T2DM group, and T2DM + 10-HDA group. The 10-HDA and T2DM + 10-HDA groups were administered intragastric 10-HDA (100 mg per kg body weight), while the control and T2DM groups were administered a vehicle, daily for 4 weeks. Our analysis indicated that there was no significant difference in body weight between T2DM + 10-HDA and control group mice (P > 0.05). Treatment with 10-HDA reduced fasting blood glucose and increased insulin levels in diabetic mice (P < 0.05), as well as increasing the area of pancreatic islets (P < 0.05), and alleviating vacuolar degeneration in the liver. Further, 10-HDA intervention increased superoxide dismutase, catalase, and glutathione peroxidase activities in diabetic mouse liver, alleviated lipid peroxidation, inhibited liver NF-κB nuclear translocation, decreased IL-6 and TNF-α content, and increased P-PI3K, P-AKT, and P-GSK3β protein levels (all P < 0.05). Fifteen potential biomarkers were screened by analysis of liver metabolomics data, of which hexadecanamide, stearamide, pentadecanoic acid, and fatty acid esters of hydroxy fatty acids (16:0/18:1) were highly abundant. In conclusion, 10-HDA has clear hypoglycemic effects on diabetic mice, through the PI3K/AKT/GSK3β signaling pathway.
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高影响因子
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