RSC Advances
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2022
·Vol. 12
·期 15
·9342-9350
·
IF 4.036
Yuyi Zhang,Wei Zhang,Yajie Bian,Yiting Liu,Xiaolei Zhang,Mengdi Chen,Bingwen Hu,Qingyuan Jin
Zeolitic imidazolate framework-8 (ZIF-8) is one of the most promising metal–organic frameworks because of its excellent high porosity, stability and geometrically well-defined structure. However, the application of ZIF-8 in the field of fluorescent molecular sensing has not been intensively explored. Our work demonstrates the versatility of ZIF-8 as a carrier material, which can be used for small molecule [2-(2-hydroxyphenyl)-1H-benzimidazole (HPBI)] capture and fluorescence enhancement. ZIF-8 displays luminescent behavior changes when combined with HPBI, as the emission peaks of ZIF-8 and HPBI are located in the same range for resonance enhancement of fluorescence. The results of the experiment indicate that the fluorescence enhancement effect will change in the presence of different concentrations of HPBI. We propose that the pore structure of ZIF-8 could provide an opportunity for the adsorption of HPBI molecules, and eventually the adsorption would saturate. The high porosity of ZIF-8 provides the path to HPBI aggregation or entrance into the ZIF-8 internal structure. Our results suggest that ZIF-8 may offer great promise for molecular fluorescence sensing.
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JOURNAL OF CHROMATOGRAPHY A
·
2021
·
IF 4.759
Yuhao Han,Panpan Chen,Zhichao Li,Xiao Wang,Chenglong Sun
Ultraviolet (UV) light-catalyzed Paternò-Büchi (PB) reaction has been developed as an efficient lipid C=C double bond (DB) derivatization strategy, which can accurately assign the position of C=C bond in unsaturated lipids when coupled with tandem mass spectrometry (MS/MS). Inspired by this, here we proposed a novel visible-light induced [2+2] cycloaddition reaction combined with ESI-MS/MS and MALDI-MS/MS to identify lipid C=C position isomers. Benz[g]isoquinoline-5,10-dione (BIQD) and 6,9-difluorobenzo[g]isoquinoline-5,10-dione (DF-BIQD) were developed as a new type of [2+2] cycloaddition reagent, which can not only react with C=C bond under 254 nm UV light irradiation, but also quickly combine with lipid C=C bond under the irradiation of 405 nm visible-light and > 400 nm compact fluorescent lamp visible-light. High cycloaddition reaction conversion efficiency can be achieved by irradiating under compact fluorescent lamp light for 2 min. Moreover, we discovered that 437 nm, 489 nm, 545 nm, 581 nm, and 613 nm monochromatic light appearing in compact fluorescent lamp can individually induce the [2 + 2] cycloaddition reaction between DF-BIQD and unsaturated lipids. Using this method, we found that the expressions of lipid DB-positional isomers in rat heart, brain, lung, spleen, thymus, kidney, liver and plasma vary greatly. The relative content of FA-18:1 (Δ9) in rat heart is only 1.49 times that of FA-18:1 (Δ11), while the relative content of FA-18:1 (Δ9) in rat plasma is 5.20 times that of FA-18:1 (Δ11). The above results offer new insight into the development of photocatalytic reagent for visible-light induced [2+2] cycloaddition and structural lipidomic studies.
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SENSORS AND ACTUATORS B-CHEMICAL
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2021
·
IF 7.46
Yujie Chen,Rui Sun,Wenhui Zhu,Zhen Zhang,Yali Chen,Shuo Wang,Qiliang Deng
Covalent organic frameworks (COFs) with predesigned bipyridine recognition sites (donated as BPD-COFs) were prepared by using 2, 2’-bipyridine-5, 5’-diamine and benzene-1, 3, 5-tricarbaldehyde as monomers, and the corresponding small molecule model compound (2, 2’-bipyridine-5, 5’-diiminebenzene, donated as BPDB) was synthesized by using benzaldehyde and 2, 2’-bipyridine-5, 5’-diamine. The fluorescence sensing property between BPD-COFs and BPDB were compared as the fluorescence sensing platform for the sensitive, selective and rapid detection of Ni 2+ . The unique structure characteristics such as large conjugated structure, high surface area, regularity pore canals and predesigned bipyridine link endow BPD-COFs with prominent fluorescence emission, enough space and strong specificity for Ni 2+ . The fluorescence quenching degree of BPD-COFs is four times more than that of BPDB. Besides better selectivity, BPD-COFs also displays the prominent advantages, such as the wider concentration range (4.20 × 10 −10 ∼1.26 × 10 -6 M) and lower limit of detection (6.80 × 10 -11 M) compared to that of BPDB (1.00 × 10 -7 ∼5.00 × 10 -7 M, 4.50 × 10 -8 M). Good spiked recoveries (>92.0 %) in chocolate and tea support that BPD-COFs is competent to detect Ni 2+ in real samples. All these results indicate that BPD-COFs is potential as a fast, sensitive, and accurate fluorescence sensing platform for the selective detection of Ni 2+ in complex system.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2020
·
IF 2.627
Pengze Zhang,Yangzhen Jin,Zhaobin Jiang,Guanqun Xie,Qunfeng Zhang,Xiaonian Li
Developing of non-metallic catalyst to replace metal catalyst is a meaningful and challenging direction. In this work, the non-metallic catalyst was synthetized successfully by loading ionic liquid onto the silica surface, which was applied for the gas-phase dehydrochlorination of 1, 1, 2, 2-tetrachloroethane. The 12%TPPC/SiO 2 (wt%) showed the best results with the conversion of 1, 1, 2, 2-tetrachloroethane reaching 100%. The selectivity of 1, 1, 2-trichloroethylene was 100%, and no deactivation was found during the evaluation period. The catalytic mechanism was investigated and possible reaction route was given, which was a reference for fabricating and design of solid base catalyst.
研究领域:
催化化学
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环境科学
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Mingxiao Feng,Qianyu Wang,Minzhen Lei,Dawei Zhang,Qian Yu,Chunyan Yan
Neuroinflammation is closely linked to Alzheimer's disease, where the deposition of amyloid-beta activates microglia, triggering multiple processes that lead to neuronal damage and cognitive decline. However, studies have shown that water extract of Pinellia ternata can improve cognitive function and reduce inflammatory response in the brain injury of mice. Herein, a water-soluble polysaccharide, PTTBP-2-2. with a molecular weight of 11.7 kDa, consisting of D-Glc, D-Gal, D-Xyl, and L-Ara, was isolated from P. ternata . Methylation analysis, partial acid hydrolysis, and nuclear magnetic resonance revealed that the of PTTBP-2-2 backbone consisted of →4)- α -D-Glc p -(1→, →4,6)- α -D-Glc p -(1→, and →6)- α -D-Gal p -(1 → residues, with side chains substituted at O -2, O -3, and O -6 positions of →4)- α -D-Glc p -(1→. In vitro experiments demonstrated that PTTBP-2-2 significantly reduced nitrous oxide levels in BV2 microglia cells and suppressed the expression of pro-inflammatory genes, including COX2 , iNOS , TNF-α , IL-1β , and IL-6 . These factors are key mediators of neuroinflammation. Mechanistic investigations revealed that the anti-neuroinflammatory activity of PTTBP-2-2 was mediated through the regulation of NF-κB and Nrf2/HO-1 signaling pathways. Overall, PTTBP-2-2 shows potential as a therapeutic agent for the treatment of neuroinflammation.
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ANALYTICAL LETTERS
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2010
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IF 1.317
Shuhui Ma,Jigang Gao,Zhiqi Li,Jie Zhou
A new fluorescent probe, 2-(2-thienyl)benzothiazoline was synthesized. Its structure was characterized with elemental analysis, IR and 1H NMR. The fluorescent probe can be oxidized by to form a less fluorescent product. Based on this reaction, a spectrofluorometric method was developed to determine the content of superoxide anion radicals and superoxide dismutase activity. There was a good linear relationship with a correlation coefficient 0.9996 between the scavenging percentage of and SOD activity. The method was simple, selective, and sensitive. It was successfully applied to the determination of SOD activity in garlic and onion samples.
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MOLECULAR CRYSTALS AND LIQUID CRYSTALS
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2020
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IF 0.512
Yang Yun-Xia,Xia Shi-Ying,Zhang Hai-Xia,Niu Hui-Hui
Three complexes of (CH3)4N+·(C15H15O2)2H-·H2O (1), (CH3)4N+·C15H15O2-·H2O (2), and 2(C2H5)4N+·2C15H15O2-·C15H16O2·3H2O (3) have been prepared under the similar conditions by using 2, 2’-bis (4-hydroxyphenyl) propane as the host and tetraalkylammonium as the guest. Then, the complexes were characterized by X-ray single crystal diffraction. The results show that 1 and 2 are two polymorphs, and in complex 3, only the magnitude of the template is different from the former two complexes. Although, the hydrogen bonding of three compounds are all related to the traditional O-H…O hydrogen bonds between the phenolic hydroxyl groups and water molecules, they eventually form various channel frameworks with different shape of cavities, such as the peanut-like channels in complex 1, the cross-shape in complex 2, and varied hexagonal-shape and tetragonal-shape cavities in complex 3. And the corresponding guest cations are contained in these channels to build the related stable crystal structures. Obviously, 2,2’-bis (4-hydroxyphenyl)propane, as a more flexible “V” type host molecule with terminal hydroxyl groups, can interact with tetraalkylammonium template and the auxiliary water molecules to construct different host lattices, showing excellent ability of forming hydrogen bonds.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Shasha Fang,Yue Geng,Lu Wang,Jun Zeng,Shimin Zhang,Yucheng Wu,Xiangui Lin
Polybrominated diphenyl ethers (PBDEs) are persistent pollutants that may undergo microbial-mediated debromination in anoxic environments, where diverse anaerobic microbes such as methanogenic archaea co-exist. However, current understanding of the relations between PBDE pollution and methanogenic process is far from complete. To address this knowledge gap, a series of anaerobic soil microcosms were established. BDE-47 (2, 2′, 4, 4′-tetrabromodiphenyl ether) was selected as a model pollutant, and electron donors were supplied to stimulate the activity of anaerobes . Debromination and methane production were monitored during the 12 weeks incubation, while obligate organohalide-respiring bacteria (OHRBs), methanogenic, and the total bacterial communities were examined at week 7 and 12. The results demonstrated slow debromination of BDE-47 in all microcosms, with considerable growth of Dehalococcoides and Dehalogenimonas over the incubation observed in most BDE-47 spiked treatments. In addition, the accumulation of intermediate metabolites positively correlated with the abundance of Dehalogenimonas at week 7, suggesting potential role of these OHRBs in debromination. Methanosarcinaceae were identified as the primary methanogenic archaea, and their abundance were correlated with the production of debrominated metabolites at week 7. Furthermore, it was observed for the first time that BDE-47 considerably enhanced methane production and increased the abundance of mcrA genes, highlighting the potential effects of PBDE pollution on climate change. This might be related to the inhibition of reductive N- and S-transforming microbes, as revealed by the quantitative microbial element cycling (QMEC) analysis. Overall, our findings shed light on the intricate interactions between PBDE and methanogenic processes, and contribute to a better understanding of the environmental fate and ecological implication of PBDE under anaerobic settings.
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MATERIALS RESEARCH INNOVATIONS
·
2022
·
IF 0
Wenyan Huang,Zhongwei Ge,Li Jiang,Hongjun Yang,Qimin Jiang,Bibiao Jiang,Xiaoqiang Xue,Yonglei Wang
A novel functional inimer 2-(2-bromoisobutyryloxy)ethyl methacrylate(BiBEM) both with the double bond and bromide was designed and synthesised. The branched polystyrene (PS) was prepared by the atom transfer radical polymerisation (ATRP), using BiBEM as inimer (initator) and CuBr complexed with bipyridine as catalysts in toluene at 80°C. The molecular weight and the branching degree of the polystyrene were analysed by using triple detection size-exclusion chromatography (TD-SEC) and the storage modulus in a wide and high-frequency range of polystyrene microrheological properties were studied by the diffusive wave spectroscopy (DWS). By adjusting the ratio of inimer to catalysts, a series of branched polystyrene polymers with different molecular weight and branching degree were obtained. The increase of the BiBEM concentration led to a higher degree of branching, while higher molecular weight and broader molecular weight distribution are accompanied. The branched polystyrene showed low storage modulus and lower chain entanglement compared to linear analogues.
研究领域:
高分子化学
·
材料科学
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FUEL
·
2022
·
IF 8.035
Yi Liu,Ying Chen,Shuang Ma,Xianlong Liu,Xiangwen Zhang,Ji-Jun Zou,Lun Pan
High-energy–density (HED) fuels have attracted extensive attention for volume-fixed aerospace vehicles because they can provide more propulsion energy to increase the payload and range of aerospace vehicles. Herein, we report a route for synthesis of HED fuel, pentacyclo[8.2.1.1 4,7 .0 2,9 .0 3,8 ]tetradecane (PCTD) with strained structure, by photoinduced intermolecular [2 + 2] cycloaddition of norbornene (NBE). The triplet quenching and phosphorescence quenching results indicate that NBE cycloaddition is conducted through the photosensitized processes containing triplet–triplet energy transfer, cyclization and relaxation. The reaction conditions are optimized to obtain the high photocatalytic activity, with the NBE conversion and PCTD selectivity reaching 78.7% and 94.4%, respectively. Moreover, a kinetic model is proposed with the reaction rate equation being correlated with the incident light flux, with the pseudo reaction kinetics parameters and reaction rate equations obtained. Importantly, PCTD shows high density of 1.024 g/mL and high volumetric net heat of combustion of 42.98 MJ/L, much higher than those of JP-10. In addition, blending with JP-10 or QC can significantly improve cryogenic properties of blended fuels, which is very promising for the practical application.
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CHEMOSPHERE
·
2019
·
IF 5.108
Yating Jia,Fan Hu,Yuancai Lv,Yuancai Chen,Yongyou Hu
Polybrominated diphenyl ethers (PBDEs) are widely used as flame retardants and challenges for water treatment due to their persistence and toxicity. In this study, the reduction of 2′2′4′4′-tetrabromodiphenyl ether (BDE-47) was investigated in a nano-bio-integrated system. Results showed that the introducing of P. putida could markedly accelerate the demineralization of BDE-47 in nZVI/Pd- P.p system; the continuous generation of acidic metaboliates by P. putida could decrease pH, which could alleviate the surface passivation to some extent, resulting in the releasing of Fe 2+ and high generation of H 2 O 2 , the shift in reactive oxygen species from Fe(IV) to •OH. The BDE-47 was firstly debrominated to the DE by the highly reductive [Pd·2H] generated by nZVI/Pd, then oxidized to bromophenol and phenol, catechol as well as hydroquinone via the P. putida strain and the Fenton-like system. The toxicity assays confirmed the combined system could avert generation of nocuous intermediates, and could be an alternative strategy for complete remediation of recalcitrant POPs.
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POLYHEDRON
·
2014
·
IF 2.047
Tianzhi Yu,Ruizhi Liang,Yuling Zhao,Yalu Song,Bin Gao,Minghao Li,Luofu Min,Hui Zhang,Duowang Fan
Lanthanide complexes of the form Ln(DBM) 3 (Cz-PBM) (where Ln = Gd(III), Tb(III) and Eu(III); DBM = dibenzoylmethane and Cz-PBM = (4-(9 H -carbazol-9-yl)phenyl)methyl-2-(2′-pyridyl)benzimidazole) have been successfully synthesized and characterized. The crystal structures of the Gd(III) and Tb(III) complexes were determined by single-crystal X-ray analysis. The results reveal that in the complexes the central metal ions assume a square antiprismatic geometry and are octa-coordinated by six oxygen atoms from DBM ligands and two nitrogen atoms from the Cz-PBM ligand. Under excitation with ultraviolet light, the Eu(III) complex exhibited a strong red emission, but the Tb(III) complex did not show the characteristic emissions of the Tb 3+ ion. The results show that the ligands favor energy transfers to the emitting energy level of Eu 3+ .
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