MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Bohong Li,Meiyu Wang,Jingjin Zhao
Ascorbic acid (AA) which can be supplemented by exogenous sources such as food and beverage, plays an important role in human health. Abnormal level of AA in human body usually leads to various diseases. A facile MnO 2 nanosheet-assisted ratiometric fluorescent sensor for AA was constructed in this work. MnO 2 nanosheet (MnO 2 NS) could not only greatly quench the fluorescence of Pyronin Y (PY) by inner filter effect (IFE) but also oxidize non-fluorescent thiamine (vitamin B 1 , VB 1 ) to blue fluorescent thiochrome (oxVB 1 ) by taking advantage of the oxidase-mimicking activity simultaneously. However, MnO 2 NS could be reduced to Mn 2+ in the presence of AA, inhibiting the IFE and oxidase-mimicking activity. According to this principle, the fluorescence intensity of oxVB 1 decreasing at 440 nm and the fluorescence of PY recovering at 560 nm. Under optimal conditions, the MnO 2 NS-PY-VB 1 system showed a wide linear range towards AA in the range of 0.25–110 µM with a low detection limit reaching 0.1 µM. Furthermore, it was also applied for sensitive detection of AA in orange juice and human serum.
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高影响因子
Materials Today Communications
·
2022
·
IF 3.662
Zicheng He,Yunjie Lin,Mingfu Ye,Wenqing Zhu,Guochang Chen
The bismuth-containing semiconductors have emerged as promising materials for the degradation of organic pollutants and reduction of CO 2 . However, their potential applications in photocatalytic H 2 generation have not been explored clearly. Herein, bismuth-containing multicomponent photocatalyst Ag-BWV-y (where y represents the moles of Ag + in the initial reaction system) has been synthesized by a simple one-pot chemical method for photocatalytic H 2 generation. The element Ag is homogeneously distributed in as-prepared nanocomposite, and the band structure of Ag-BWV-y can be tuned by the dosage of Ag + ions. The optimized photocatalyst Ag-BWV-y (y = 0.15) shows a maximum H 2 evolution rate of 652 μmol h −1 g −1 , which is about 5.6-fold that of undoped sample. The narrow band gap of Ag-BVW-0.15 favors the photocatalytic activity in promoting H 2 production.
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高影响因子
PHYTOCHEMISTRY
·
2022
·
IF 4.004
Sheng-Qi Zhang,Jia-Peng Wang,Feng-Mei Zhang,Lin-Lin Yao,Bing-Xian Li,Ya-Ni Li,Dong Gan,Rui-Feng Mei,Le Cai,Zhong-Tao Ding
A chemical investigation of the endophytic fungus Diaporthe destruens from the Hernandiaceae plant Illigera orbiculata C. Y. Wu collected from southern Yunnan Province, China, led to the isolation of six undescribed compounds, including two azaphilone analogs, which are a pair of epimers (13 R- hydroxy-chermesinone A and 13 S- hydroxy-chermesinone A); a pyrrole derivative (1-(4-(methoxymethyl)-1H-pyrrol-3-yl)ethan-1-one); an isoindolone derivative (4-hydroxy-6-methoxyisoindolin-1-one); a benzylbenzene derivative (destruensine A) and a conjectural fragment of polyketide ((2 R ,4 R )-2-(methoxymethyl)pentane-1,4-diol) along with nine known compounds. Their structures were elucidated by spectroscopic methods and HRESIMS, and the absolute configurations were further confirmed by electronic circular dichroism (ECD) and chemical derivatization . The antimicrobial activities , anti-acetylcholinesterase activities, antiproliferation, and NO production inhibitory effects of compounds 1 – 15 were evaluated.
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PubMed
高影响因子
CHEMICAL PAPERS
·
2020
·Vol. 74
·期 11
·3987-3993
·
IF 1.68
Pan Binfeng,Zhang Zhimin,Lu Xuchen
Abstract The reaction between rare earth oxychloride (REOCl) and water was investigated. X-ray diffractometer, volumetric titrations, FTIR spectrograph and scanning electron microscope were used to determine the reaction process and the reaction products. It was found that the reaction could be concluded as follows: 5REOCl(s) + 5H 2 O(l) = 2RE 2 (OH) 5 Cl(s) + RE 3+ (aq) + 3Cl − (aq). Based on this reaction, a new method for determining the purity of anhydrous rare earth chloride was proposed. Compared with the conventional method, the maximum absolute error decreased from 22 to < 1% and the maximum relative error decreased from 111 to < 4% under the experimental conditions. Graphic abstract
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POLYMER
·
2023
·
IF 4.6
Xi Zhao,Guoxiang Wang,Yong Gao,Chong Cheng
Mixed shell polymer nanoparticles (MSPNs) have emerged as a very significant research topic in the field of macromolecular science. In this study, a robust method for efficient preparation of MSPNs with various morphologies via polymerization-induced self-assembly (PISA) of Y-shaped ABC miktoarm star copolymers was demonstrated. Poly( ε -caprolactone)- b -poly(methyl methacrylate) diblock copolymers carrying a trithiocarbonate (TTC) group at the diblock joint (PCL-TTC-PMMA) were synthesized via the sequential ring-opening polymerization of ε-caprolactone ( ε -CL) and atom transfer radical polymerization (ATRP) of methyl methacrylate (MMA) using a multifunctional initiator. Subsequently, PCL-TTC-PMMA copolymers acted as both macromolecular chain transfer agents (CTAs) and stabilizers to mediate reversible addition-fragmentation chain transfer (RAFT) dispersion polymerization of 4-vinylpyridene (4-VP) in toluene, producing MSPNs with different morphologies including spheres, short rods , worms and vesicles. The factors influencing the morphologies of MSPNs during PISA, including solid content and the chain length of stabilizers, were investigated. RAFT-based dispersion polymerizations of 4-VP monomers mediated by PCL-TTC-PMMA copolymers were also compared with those mediated by linear PMMA - TTC with approximately the same length of PCL-TTC-PMMA under the identical conditions. Their different PISA behaviors were unraveled.
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高影响因子
POULTRY SCIENCE
·
2023
·
IF 4.4
Han Su,Kemin Wei,Minlei Zhao,Xin Li,Yibo Zhang
ABSTRACT Porphyromonas gingivalis ( P. gingivalis, P. g ) is the main pathogen of periodontal disease, which is treated with egg yolk immunoglobulin Y ( IgY ) against P. gingivalis . In order to quickly obtain IgY, 30 hens were immunized with inactivated P. gingivalis . The purification of IgY was carried out by the oleic acid ( OA ) method and the classical method ( AS ), respectively. The IgY antibody characteristics and antibacterial effects in HPDLF cells were detected by SDS-PAGE, indirect ELISA, Western blot and viability/toxicity assays. SDS-PAGE and Western blot analysis showed that IgY molecules which were rapidly purified by OA method were complete and specific to P. gingivalis . In addition, the results of crystal violet staining and bacterial staining indicated that IgY could agglutinate with P. gingivalis , inhibiting bacterial invasion of host cells. This study is the first to rapidly and efficiently purify IgY by OA method, and the purified IgY is expected to be used in the detection and treatment of P. gingivalis .
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PubMed
高影响因子
NANOTECHNOLOGY
·
2018
·Vol. 29
·期 40
·405705
·
IF 3.404
Junnan Li,Ziwei Pan,Kebin Zhou
Developing efficient catalysts to accelerate the rate of oxygen evolution reaction (OER) is critical for photocatalytic water-splitting. In this work, metallic Ir, IrOx(OH)y, and core–shell Ir@IrOx(OH)y were synthesized and employed as OER catalysts for photocatalytic water oxidation. It was found that the Ir@IrOx(OH)y core–shell heterostructure catalyst showed the best photocatalytic performance among these three catalysts, with the oxygen evolution rate as high as 59.63 mmol g−1 h−1. Detailed investigations revealed that the excellent photocatalytic activity of Ir@IrOx(OH)y could be attributed to both the outstanding intrinsic activity of IrOx(OH)y shell and the efficient electron transfer between the photosensitizer and catalyst.
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PubMed
高影响因子
Molecular Catalysis
·
2018
·
IF 0
Fuhai Li,Dairong Hu,Yahui Yuan,Binbin Luo,Yibing Song,Songtao Xiao,Guanghui Chen,Yiwen Fang,Fushen Lu
To mimic biological enzyme in catalysis, metal-imidazole-salen complexes were proposed (via DFT calculation) and synthesized in situ within the cavities of Y zeolite. Among the synthesized zeozymes, the Cu-salenIIY exhibited a prominent catalytic efficiency for the selective oxidation of benzyl alcohol. Specifically, the activity and selectivity of the encapsulated catalyst were comparable to those of the free Cu-salenII complex in solution. Furthermore, the high activity and selectivity were preserved during the repeated cycles. The similarity in the initial activity implies that the Cu-salenII complex just resides in the cavity of the zeolite Y, and its intrinsic properties responsible for the catalytic activity keep intact after encapsulation. The confinement of zeolite nanocavities effectively inhibited the dimerization or aggregation of the Cu-salenII complex and prevented the active species from escaping into reaction solution, thus resulting in a remarkably improved in the catalytic reusability and durability.
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ANALYTICAL CHEMISTRY
·
2018
·
IF 6.042
Lin Yang,Ming Xuan Gao,Hong Yan Zou,Yuan Fang Li,Cheng Zhi Huang
Nature enzyme-based immunoassays have been widely used in fundamental scientific research and clinical diagnosis. However, the limitations of natural enzyme, such as the low physical/chemical stability or susceptibility to protein denaturation, greatly restrained its applications. In this article, we reported a new enzyme-free SERS immunoassay by utilizing plasmonic Cu2–xSySe1–y nanoparticles (NPs) as nanocatalyst to catalyze the click chemistry between the azido and alkynyl substrate which is used as the SERS signal reporter. The unique vibration of C≡C of alkynyl in the Raman-silent region (1800–2800 cm–1) is not overlapped with the signals of the other conventional Raman reporters or endogenous biological species, and thus it can make sure the enzyme-free SERS immunoassay has high selectivity and sensitivity. As a proof of concept, prostate-specific antigen (PSA), a biomarker of prostate cancer in blood, has been detected. The SERS immunoassay shows good analytical performance for PSA in the range of 3–120 ng mL–1, and it has been successfully applied to detect PSA in the serum samples of prostate cancer patients, proving that the proposed enzyme-free SERS immunoassay has great potential in the clinical diagnosis of cancer.
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PubMed
高影响因子
JOURNAL OF INCLUSION PHENOMENA AND MACROCYCLIC CHEMISTRY
·
2017
·Vol. 90
·期 1
·149-155
·
IF 1.095
Dong Peng,Li Zeyu,Ji Dong,Wang Xiaorui,Yun Hongfei,Du Zhisong,Bian Jie,Li Guixian
Modified Y type catalyst (M-Y) shows great potential for the preparation of toluene attribute to catalyst topology and synergistic effect of Lewis acid and Brönsted acid in the alkylation reaction. However, it still remains a big challenge to build a reaction mechanism. Thereby, based on the study of HZSM-5, H-beta and M-Y catalysts structure and physical properties, a plausible reaction mechanism was proposed. The samples were characterized by X-ray diffraction, N 2 adsorption/desorption, Fourier transform infrared absorption spectra and Pyridine adsorption infrared. The activity of catalysts was tested in benzene alkylation with methanol and was found to be in the following increasing order: Na-Y (no effect) < H-Y << HZSM-5 < H-beta < M-Y.
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高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 33
·17217-17223
·
IF 7.443
Liang Huang,Xiang Gao,Qiang Dong,Zhimi Hu,Xu Xiao,Tianqi Li,Yongliang Cheng,Bin Yao,Jun Wan,Dong Ding,Zheng Ling,Jieshan Qiu,Jun Zhou
Pseudocapacitors, which store charge through fast reversible redox reactions occuring at the surface of the electrode, could offer higher specific capacitance than electrochemical double-layer capacitors (EDLCs). However, the prime pseudocapacitive phase, transition metal oxides usually have poor electronic conductivity, limiting their practical application. Here, we fabricated highly conductive HxMoO3−y nanobelts as electrode materials for pseudocapacitors. This electrode has demonstrated great electrochemical activity in various aqueous cation solutions with the highest volumetric capacitance of over 350 F cm−3. Significantly, this electrode has high specific capacitance as well as excellent cycling stability in sea water. Moreover, this hybrid composite also exhibits remarkable ion electrosorptive capacity (4 mg g−1) as a desalination electrode.
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高影响因子
Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 24
·5584-5592
·
IF 5.066
Xiaolong Li,Shirong Wang,Yin Xiao,Xianggao Li
Based on Y-type titanylphthalocyanine nanoparticles (Y-TiOPc NPs) with an average diameter of 2.5 ± 0.6 nm, a trap-assisted ultrasensitive near-infrared organic photodetector (NIR OPD) has been successfully fabricated using the dip-coating process. The prepared OPD exhibited an obvious photomultiplication phenomenon with the highest external quantum efficiency (EQE) of 354 200%, an excellent photosensitivity with the maximum photoresponsivity (R) of 2227 A W−1, and an outstanding low-light detection with the highest normalized detectivity (D*) of 3.1 × 1014 Jones under 780 nm illumination with a low intensity of 0.1 μW cm−2 at +15 V μm−1. Such performances were attributed to the ultrasmall Y-YiOPc NPs with remarkable photosensitivity and a high surface-to-volume ratio which can enhance external hole tunneling injection assisted by trapped-electrons at the photoactive layer/ITO interface. The high EQE and R properties of the device, as well as the prompt, steady and reproducible photocurrent response during repeated on/off cycles of illumination, suggested that the prepared OPD was desired for ultrasensitive NIR detection. Therefore, the ultrasmall Y-TiOPc NPs proposed in this study showed great promising application in the large-area and low-cost solution process of ultrasensitive NIR OPDs.
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高影响因子
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