ANALYST
·
2019
·Vol. 144
·期 13
·4086-4092
·
IF 4.019
Lili Chen,Xiangguang Li,Tongda Zou,Tiantian Wang,Xiping Cui,Yingshan Chen,Chunguo Zhang,Suqing Zhao
Given that Helicobacter pylori (H. pylori) generally infects people in early childhood and that such persons when not treated with antibiotics remain infected for the rest of their lives, it is quite important to detect H. pylori in children, and convenient to do so using non-invasive methods. Stool antigen tests constitute such an effective non-invasive method. In the current work, a novel fecal test was developed to detect H. pylori based on immunomagnetic beads (IMBs) with monoclonal antibodies sensitively recognizing and capturing the H. pylori, coupled with a polyclonal antibody-conjugating quantum dot probe, and ultrasensitive detection was achieved by using a fluorescence spectrometer. The detection method took 120 min to perform, and showed a limit of detection of 102 CFU mL−1 and a linear range of 10 to 106 CFU mL−1 (R2 = 0.9962). Most importantly, this method can be effectively applied to real samples. This study provided a novel method for the non-invasive detection of the fecal antigen H. pylori.
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DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Jianfeng Fan,Jiarong Huang,Liming Cao,Shiheng Yin,Yukun Chen
Recyclable polyvinylidene fluoride/silicone rubber (PVDF/SR) thermoplastic vulcanizates (TPVs) containing a high mass ratio of SR (50%) with excellent mechanical performances and shape memory behavior were fabricated. The inert PVDF was first dehydrofluorinated via β-H elimination reaction to introduce reactive double bonds. Then, the functional groups were initiated by dicumyl peroxide (DCP) during dynamic vulcanization to realize interfacial grafting (SR-g-PVDF) simultaneously. In situ grafted PVDF chains tightly bridge the immiscible phases, leading to the excellent interfacial adhesion. Consequently, the tensile strength, elongation at break, and tensile toughness were significantly increased to 14.5 MPa, 174.6%, and 12.3 kJ/m3, respectively, which were almost 2.0, 13.6, and 10.3 times than that without interfacial grafting reaction (7.2 MPa, 12.8%, and 1.2 kJ/m3). Also, their excellent mechanical properties were almost perfectly maintained after multiple repetitive processing. Furthermore, the chemical anchoring structure of SR-g-PVDF across the interface could effectively and quickly transfer the force, contributing to the shape memory performances. The obtained TPVs (m60 and m80) showed an impressive shape recovery ratio (>80%) even after two fixing-recovery cycles.
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DOI
高影响因子
CATALYSIS LETTERS
·
2013
·Vol. 143
·期 5
·463-468
·
IF 2.244
Zhu Anlian,Li Qianqian,Li Lingjun,Wang Jianji
Abstract A series of choline-based ionic liquids (CIL) have been synthesized in this work. The results suggested that both the cations and the anions have significant influences on their properties such as thermostabilities, acidities and their performances for the synthesis of 3,4-dihydro-2(H)-pyrimidinones. The optimized catalytic system based on the CIL [DMEA][HSO 4 ] for the Biginelli reactions benefits from the wide substrates tolerance, benign reaction conditions, easy work-up procedures, and the feasible reusability of the ionic liquid. Graphical Abstract The thermostabilities, acidities, and the catalytic activities for the Biginelli reactions are all follows the sequence of [DMEA][HSO 4 ] > [Choline] [HSO 4 ] > [DMEA][H 2 PO 4 ] > [Choline] [H 2 PO 4 ] .
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高影响因子
Inorganics
·
2024
·Vol. 12
·期 11
·273
·
IF 3.1
Quan Yang,Xiansong Jia,Zhikang Qin,Xiaoli Ding,Yongtao Li
Carbon-based materials with excellent catalytic activity provide new ideas for the development of magnesium-based hydrogen storage. C-H bonding interactions may play a key role in performance improvement. In this work, we comprehensively compare the magnesium-carbon cloth composites (CC) prepared by method of dry ball milling and wet impregnation. The results were that the hydrogen release activation energy (Ea) of MgH2@CC composites prepared by wet immersion method was 175.1 ± 19.5 kJ·mol−1, which was lower than that of pure MgH2(Ea= 213.9 ± 6.4 kJ·mol−1), and the activation energy of MgH2-CC composites prepared by ball milling method was 137.3 ± 8.7 kJ·mol−1, which provided better results. The kinetic enhancement should be attributed to C-H interactions. The presence of carbon carriers and electron transfer to reduce the activation energy of Mg-H bond fracture. These results will provide further insights into the promotion of hydrogen ab-/desorption from metal hydrides.
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高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2021
·
IF 4.354
Ming Li,Jun-Yang Tao,Liang-Neng Wang,Jia-Wei Li,Yue-Jin Liu,Ming-Hua Zeng
Modification of commercially available biaryl monophosphine ligands via ruthenium(II)-catalyzed P(III)-directed-catalyzed ortho C–H secondary alkylation is described. The use of highly ring-strained norbornene as a secondary alkylating reagent is the key to this transformation. A series of highly bulky ligands with a norbornyl group were obtained in excellent yields. The modified ligands with secondary alkyl group outperformed common substituted phosphines in the Suzuki–Miyaura cross-coupling reaction at a ppm mole level of Pd catalyst.
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高影响因子
ORGANIC & BIOMOLECULAR CHEMISTRY
·
2018
·Vol. 16
·期 33
·5999-6005
·
IF 3.423
Jie Zhu,Baojun Xu,Jingjing Yu,Yaokun Ren,Jin Wang,Ping Xie,Charles U. Pittman,Aihua Zhou
Flavone selenide or sulfur-containing derivatives are pretty valuable in drug discovery due to their diversity of important bioactivities. Here, two simple Cu-catalyzed methods of constructing C–Se and C–S bonds on flavone skeletal structures via C–H functionalization are reported, which regioselectively afford flavone selenide and sulfide derivatives in good yields using cheap KSeCN or KSCN salts as selenium and sulfur agents. These methods further enrich the current C–Se and C–S bond construction methods.
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高影响因子
JOURNAL OF THE INDIAN CHEMICAL SOCIETY
·
2025
·
IF 3.4
Xiaoyan Gao,Nisar Ali,Meng Zhao,Guang Hu,Adnan Khan,Dandan Min,Lijing Zhang,Lingli Ni,Mohammed Albahri
Nacre-like polymer nanocomposites have become fascinating material nowadays because of their exceptional mechanical property. In this study, nacre-like waterborne polyurethane/hexagonal boron nitride (WPU/h-BN) nanocomposite with high-thermal, mechanical and water resistance has been successfully prepared via mechanical blending method. Owing to strong interfacial interactions and a nacre-like structure, the WPU/h-BN nanocomposite with a loading amount of 30 wt% exhibits excellent tensile strength of 27.3 MPa, compared with 4.16 MPa for pure WPU. Additionally, it has an exceptional maximum decomposition temperature of 443 °C and an outstanding water absorption ratio of 8.1 %. This approach of adopting h-BN and WPU to construct nacre-like structure may provide a new path for preparing high performance WPU strategies.
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产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 54
·48590-48598
·
IF 3.289
Yu Shang,Bo Jin,Rufang Peng,Zhicheng Guo,Qiangqiang Liu,Jun Zhao,Qingchun Zhang
A series of nitrogen-rich heterocyclic 1H,1′H-5,5′-bistetrazole-1,1′-diolate salts, namely, 1,2,4-triazolium (2), 3-amino-1,2,4-triazolium (3), 4-amino-1,2,4-triazolium (4), 3,5-diamino-1,2,4-triazolium (5), 2-methylimidazolium (6), imidazolium (7), pyrazolium (8), 3-amino-5-hydroxypyrazolium (9), dicyandiamidine (10), and 2,4-diamino-6-methyl-1,3,5-triazin (11), was synthesized with cations. These energetic salts were fully characterized through FT-IR, 1H NMR, 13C NMR, and elemental analysis. The structures of 2, 3·7H2O, 6·2H2O, 8, and 10·4H2O were further confirmed through single crystal X-ray diffraction. Their thermal stabilities were investigated through differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The results indicated that all of the salts possess excellent thermal stabilities with decomposition temperatures ranging from 225.7 °C to 314.0 °C. On the basis of the Kamlet–Jacobs formula, we carefully calculated their detonation velocities and detonation pressures. All of the salts, except 11, exhibit promising detonation performances with a detonation pressure of 20.23–28.69 GPa and a detonation velocity of 7050–8218 m s−1. These values are much higher than those of TNT. The impact sensitivities of the compounds were determined via a Fall hammer test. All of the compounds show excellent impact sensitivities of >50 J, and this finding is higher than that of TATB (50 J). Therefore, these ionic salts with excellent energetic properties could be applied as new energetic materials.
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高影响因子
MACROMOLECULES
·
2020
·
IF 5.918
Jia Wang,Yue Chen,Canbin Ye,Anjun Qin,Ben Zhong Tang
The heteroatom-containing polymers are important components of advanced functional materials. Among the tremendous synthetic methodologies, polymerization via C–H activation is a powerful tool for the preparation of functional heteroatom-containing polymers, which should be further enriched, especially via C(sp3)–H activation. In this work, a new atom economic Pd(0)/benzoic acid catalyzed polymerization of internal diynes and secondary diamines via C(sp3)–H activation; i.e., C(sp3)–H polyamination of internal alkynes was successfully established. A series of regio- and stereoregular functional poly(allylic tertiary amine)s with high weight-average molecular weights (Mw, up to 25 600) were synthesized in excellent yields (up to 98%). The resultant polymers possess good solubility and film-forming ability, and their thin films exhibit high refraction indices (RI) with the range of 1.7207–1.6797 at 632.8 nm. Moreover, all the poly(allylic tertiary amine)s are emissive in solution and solid states. Thanks to the tolerance to functional groups of this polymerization, the tetraphenylethene (TPE) moiety could be facilely incorporated to endow the resultant polymers with the unique aggregation-enhanced emission (AEE) characteristics. Thus, this work not only establishes a powerful C(sp3)–H polyamination but also provides a strategy to facilely prepare functional nitrogen-containing acetylenic polymers.
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高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2019
·
IF 3.834
Yunchao Feng,Miao Zuo,Ting Wang,Wenlong Jia,Xiaoyu Zhao,Xianhai Zeng,Yong Sun,Xing Tang,Tingzhou Lei,Lu Lin
Production of 5-hydroxymethylfurfural (HMF) from glucose with high yield remains a big challenge. Thereinto, assembling catalysts with outstanding performance is the bottleneck at the current stage. In this study, effective catalysts were synthesized by loading SO 4 2− /ZrO 2 (SZ) on a series of H + zeolites to investigate the catalytic dehydration of glucose into HMF. Among all the catalysts applied, 2-SZ-HM-550 (HZSM-5 with Si/Al molar ratios of 80∼150, calcined at 550 °C) gave the yields of HMF 41.32%, 61.14%, 54.67% and 40.71% in 4 applied reaction systems, respectively. Moreover, HMF with desirable yield was obtained while other carbohydrates were dehydrated catalyzed by 2-SZ-HM-550, such as fructose, sucrose, inulin and starch.
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高影响因子
STAR Protocols
·
2022
·
IF 0
Tao Shen,Wenhao Li,Yan Zhao,Yunqi Liu,Yang Wang
Summary Syntheses using classic coupling reactions can be tedious, leading to a dearth of ambipolar semiconducting polymers. Here, we detail the rapid synthesis of balanced ambipolar polymers by using a carbon-hydrogen (C–H) activation strategy. Using this protocol, two C–H reactive hydrogenated monomers and six ambipolar polymers can be rapidly synthesized within 2 h via C–H activation and the optoelectronic properties of the resultant polymers can be characterized. We also describe the fabrication process and performance evaluation of the ambipolar polymers-based organic transistors. For complete details on the use and execution of this protocol, please refer to Shen et al. (2022) .
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PubMed
JOURNAL OF ELASTOMERS AND PLASTICS
·
2023
·
IF 1.7
Xiaoyong Yang,Xiaofang He,Fuqin Xu,Zhaoyang Hou,Zhihui Ma,Jing Cai,Ruimin Jiao
With the rapid development of electronic devices and rubber tires, the industry has put forward new requirements for the heat dissipation of rubber components. With excellent thermal conductivity, oxidation resistance, and thermal stability, hexagonal boron nitride (h-BN) is often added to plastics or rubber as a thermally conductive filler, but is less effective when used directly. In this study, h-BN-K was prepared by direct modification of the mixed solution of KH-550, and KH-570, while h-BN-PK was prepared by co-modification of dopamine, KH-550, and KH-570. Two modified h-BN were added to natural rubber (NR) to improve the vulcanization properties, mechanical properties, and thermal conductivity. It was found that the tensile strength and thermal conductivity of 20 wt% h-BN-PK/NR composites were 30.6 MPa and 0.335 W/mK, which were 39.1% and 110.7% higher compared to pure NR (22.0 MPa and 0.159 W/mK), respectively. In addition, the addition of h-BN improved the thermal stability performance of NR to some extent. In conclusion, the h-BN-PK/NR composites provide a certain reference for the use of thermally conductive NR and suggest new ideas for heat dissipation of electronic devices.
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高影响因子
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