SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2019
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IF 2.931
Wenyi Zhang,Bingbing Wu,Zhongfeng Li,Yingfeng Wang,Jing Zhou,Yaping Li
Carbon quantum dots (CQDs) have been fabricated by a facile single-step pyrolysis method from citric acid and ethylene imine polymer. When excited at 359 nm, CQDs show intense blue fluorescence at 434 nm. The fluorescence can be effectively quenched by folic acid (FA), which is attributed to the combination of static quenching and inner filter effect. Thus, the CQDs are developed as an efficient fluorescent sensing platform for label-free sensitive and selective detection of FA. Key parameters influencing the detection were investigated, such as incubation time, salt concentration, selectivity and potential interferences. Under the optimal conditions, a good linearity was observed for the emission intensity against 1.14–47.57 μM with a correlation coefficient of 0.99. The limit of detection was found to be 0.38 μM. The practical application of the sensing system was demonstrated by analyzing FA in human urine samples. The sample recoveries fell in the range of 82.0%–113.1% with RSDs ≤ 10.9%, which presented its reliable and feasible application in real samples.
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JOURNAL OF CHEMICAL RESEARCH
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2019
·
IF 0.67
Yamu Xia,Chenglong Chen,Mengying Li,Weizeng Zhou,Shuyu Sun,Shanpeng Chu,Hui Wang
Mariamide A, a lignanamide isolated from the seeds of Silybum marianum, has demonstrated potential utility as an antioxidant and antidiabetic agent and possesses an 8-O-4′ neolignan skeleton. Herein, a first total synthesis of mariamide A is presented that proceeds in nine steps using vanillin as the starting material. The key steps for the preparation of mariamide A involve an I2-catalyzed bromomethoxylation of an alkene group, a nucleophilic substitution followed by a sequential elimination and a monoacylation reaction.
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INDUSTRIAL CROPS AND PRODUCTS
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2019
·
IF 4.191
Xianghe Meng,Dan Xiao,Qin Ye,Xiaohua Nie,Jiasheng Wu,Lili Song
In recent years, in concern for human health, increasing attention was focused on sciadonic acid (SA), a unique Δ5-olefinic acid. Torreya grandis ( T. grandis ), a large, evergreen coniferous tree, whose seed yields rare and is known for a high level of SA. Triacylglycerols (TAGs) from the seeds of four different T. grandis varieties (Yuanfei, Xifei, Xiangyafei, and Zhimafei), were analyzed with respect to fatty acid profiles and positional distributions. The results indicated that SA represented the majority of the Δ5-olefinic acids in T. grandis seed oil. Irrespective of the variety, SA was naturally abundant at the sn-3 position of TAGs where they accounted for approximately 7.52%–12.00%. Based on this specific characteristic of Δ5-olefinic acids, T. grandis seed oil was subjected to a two-step enrichment process involving specific lipase-catalyzed ethanolysis and urea complexing. The content of SA in the fatty acid ethyl ester was increased to 80.14% from an initial value of 9.95%. These results suggested that the developed enrichment strategy was simple and effective in concentrating SA, and had the potential for commercial application.
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ACS Sustainable Chemistry & Engineering
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2019
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IF 6.97
Cai Wu,Chun Shen,Yahui Gong,Jie Wang
The shortage of fossil resources and strict environmental regulations have ignited great efforts in the production of bio-based fuels and chemicals via biorefinery. Herein, considering the strong interaction between Ni and Mg species, we specially designed and prepared Ni/CaMgO and Ni/MgSiO for alkylation and hydrodeoxygenation (HDO) reactions during the upgrading of the acetone–butanol–ethanol (ABE) fermentation mixture. Gratifyingly, the Mg-decorated catalysts exhibited great catalytic performance: a selectivity of 63.9% under a conversion of 94.2% was achieved for C8–C15 ketones and alcohols, which is higher than that over other heterogeneous alkali-based catalysts, and the obtained mixture was completely converted into the corresponding alkanes at 190 °C (H2 pressure: 1 MPa). It is worth noting that jet fuels or gasoline could be efficiently and selectively obtained by facile adjustment of the composition of the ABE fermentation product. Moreover, investigation on the structure–activity correlation confirmed that the outstanding activity of Ni/MgSiO for HDO could be attributed to the synergic catalysis between Ni0 and strong acid sites. The Ni/CaMgO and Ni/MgSiO catalysts reported in this work offer three advantages: selectively upgrading zymotic biomass wastes into biofuels, replacing the expensive noble metal (Pd) by the base metal (Ni), and realizing the HDO process under mild conditions and complying with the principles of “green chemistry”. Overall, this work opens a new possibility for biofuel production, which is conductive to the rational design and implementation of highly active heterogeneous catalysts.
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PETROLEUM SCIENCE AND TECHNOLOGY
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2019
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IF 1.07
Wei Chang,Doudou Zhao,Jun Lian,Sheng Han,Yuan Xue
Waste rolling oil (WRO) can be regenerated by inorganic flocculation-adsorption. Ferric hydroxide (Fe(OH)3) colloid prepared by the double decomposition reaction of FeCl3 and NaOH was selected as an inorganic flocculant. Fly ash, activated carbon, clay and silica gel were used as adsorbents to treat the WRO. Effects of different treatment conditions on the performance of the recycled oil were investigated. Results indicated that the recycled oil achieved optimum quality under the following conditions: flocculation time, 6 min; temperature, 60 °C; adsorption time, 20 min; and mass ratios of FeCl3-to-WRO, NaOH-to-FeCl3 and fly ash-to-WRO of 0.10, 3 and 0.03, respectively. NaOH combined with Fe(OH)3 effectively removed most macromolecular impurities, organic acids, lipids, and alcohols. Fly ash exerted the best adsorption rate and adsorption effect. In addition, physicochemical properties of the recycled oils were close to those of fresh oil.
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ACS Applied Materials & Interfaces
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2019
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IF 8.456
Limei Han,Wenjia Duan,Xinwei Li,Cong Wang,Ziyi Jin,Yuting Zhai,Chong Cao,Luo Chen,Wenjing Xu,Ying Liu,Yong-Yan Bi,Jianfeng Feng,Ying Mao,Qi Yue,Xiao-Yong Zhang,Cong Li
Glioma is the most frequent form of malignant brain tumors. Surgical debulking is a major strategy for glioma treatment. However, there is a great challenge for the neurosurgeons to intraoperatively identify the true margins of glioma because of its infiltrative nature. Tumor residues or microscopic satellite foci left in the resection bed are the main reasons leading to early recurrence as well as poor prognosis. In this study, a surface-enhanced resonance Raman scattering (SERRS) probe was developed to intraoperatively guide glioma resection. In this probe, molecular reporters with absorptive maxima at the near-infrared wavelength range were covalently functionalized on the surface of gold nanostars. This SERRS probe demonstrated an ultrahigh sensitivity with a detection limit of 5.0 pM in aqueous solution. By the development of glioma xenografts in a mouse dorsal skin window chamber, extravasation of this probe from leaky tumor vasculature as functions of time and distance to tumor boundary was investigated. Importantly, the invasive margin of the tumor xenograft was demarcated by this probe with a high signal-to-background ratio. Preoperative magnetic resonance imaging (MRI) first defined the position of orthotopic glioma xenografts in the brain of rat models, and the craniotomy plan was designed. The brain tumor was then excised intraoperatively step-by-step with the assistance of a handheld Raman scanner till the Raman signals of the probe completely disappeared in the resection bed. Notably, longitudinal MRI showed that SERRS-guided surgery significantly reduced the tumor recurrence rate and improved the overall survival of rat models compared with the white light-guided surgery. Overall, this work demonstrates the prognostic benefit of SERRS-guided glioma surgery in animal models. Because delineation of tumor-invasive margins is a common challenge faced by the surgeons, this SERRS probe with a picomolar detection limit holds the promise in improving the surgical outcome of different types of infiltrated tumors.
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Frontiers in Chemistry
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2019
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IF 3.782
Zhang Ying,Qu Rongjun,Xu Ting,Zhang Yu,Sun Changmei,Ji Chunnuan,Wang Ying
To further increase the quantity and density of functional groups on adsorbent, terminal triethylenetetramine hyperbranched dendrimer-like polymer modified silica-gel (SG-TETA and SG-TETA2) was synthesized. The hyperbranched dendrimer-like polymer was successfully introduced onto silica gel and new cavities were formed, which was demonstrated by FTIR, SEM, and BET. The highest adsorption capacities of SG-TETA and SG-TETA2 obtained from Langmuir model toward Au(III) were 2.11, and 2.27 mmol g−1, respectively, indicating that SG-TETA2 possessing more functional groups had a better adsorption ability. Moreover, the adsorbents combined with Au(III) ion through chelation and electrostatic attraction mechanism, after which reduction reactions for Au(III) ion loaded on adsorbents proceeded. SG-TETA2 had better adsorption selectivity than SG-TETA in removing Au(III) in Au-existed ion solution systems. SG-TETA2 had higher overall adsorption capacities compared to silica-gel-based hyperbranched polymers functionalized by diethylenetriamine. Therefore, the effective recovery makes SG-TETA2 a practical adsorbent in removing Au(III) ion from e-wastes and industrial effluents with much prospect.
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Sustainable Energy & Fuels
·
2019
·Vol. 3
·期 11
·3071-3077
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IF 4.912
Hongtao Zou,Qilu Yao,Meiling Huang,Meihua Zhu,Fei Zhang,Zhang-Hui Lu
Hydrous hydrazine (N2H4·H2O) is considered a highly promising liquid chemical hydrogen storage material because of its high hydrogen content (8.0 wt%), simple byproduct (i.e., N2) and safe handling. In this work, noble-metal-free NiFe nanoparticles (NPs) supported on nano CeZrO2 solid solutions have been facilely synthesized and successfully applied as a highly efficient catalyst for the rapid and complete decomposition of N2H4 in aqueous solution. The turnover frequency (TOF) value of the NiFe/CeZrO2 catalyst for hydrogen generation from N2H4 reached 119.2 h−1 under alkaline conditions at 343 K, which is 28-fold higher than that of the benchmark catalyst, pure NiFe NPs (4.2 h−1). Moreover, the H2 selectivity and activity show almost no decrease after five runs, indicating that the prepared NiFe/CeZrO2 catalyst possesses high durability and stability under the current conditions. The high catalytic performance can be attributed to the synergistic electronic effect between NiFe NPs and nano CeZrO2 solid solutions, as well as small nanoparticles with highly dispersed active sites.
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Science China-Chemistry
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2018
·Vol. 61
·期 10
·1301-1306
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IF 4.448
Wang Sheng,Wang Fang,Li Chengpeng,Li Teng,Cao Derong,Ma Xiang
A novel multifunctional molecule BTE-CNPH was designed and synthesized by connecting 2-(3′,5′-bis(trifluoromethyl)-biphenyl-4-yl)-2-cyanovinyl group to both side of the bisthienylethene (BTE), which exhibited excellent aggregation-induced emission (AIE) and bistable photochromism. High-contrast (>60) reversible fluorescence switching was achieved in the 1D nanowires, solid of BTE-CNPH and also in a polymethyl methacrylate (PMMA) film loaded with 1% BTE-CNPH under the alternative irradiation by 365 nm and visible light. Interestingly, the nanowire-like assembly morphology of BTE-CNPH in aqueous tetrahydrofuran (THF) solution of specific concentration was observed to translate into amorphous pieces gradually upon prolonged irradiation by the 365 nm, accompanying with photo-tunable AIE emission.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 12
·10453-10460
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IF 2.324
Yuan Rongrong,Liu Jianming,Xiang Weidong,Liang Xiaojuan
Various luminescent carbon materials are artificially synthesized and as admirable fluorescent materials because of the increased research of carbon nanodots (CDs). Herein, a novel solvent-dependent red CDs (rCDs) is introduced through solvothermal method. The as-prepared rCDs remain benzene structure and possess abundant surface function groups that endow them well solubility in various solvents. Furthermore, multicolor luminescence are observed when rCDs are dissolved in different solvents, and the emission wavelength of these materials can be well-tuned from 475 to 624 nm, which presents intensity solvent-dependent properties. Red luminescence carbon phosphors are successfully synthesized by mix rCDs with silica powder. Finally, warm white light emitting diodes (WLEDs) are constructed using rCDs powder with Ce 3+ : YAG single crystal and blue GaN chips. The results demonstrate that the rCDs can act as red component to modify the correlated color temperature (CCT) and the color rendering index (CRI) of WLEDs .
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
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2018
·Vol. 34
·期 3
·350-357
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IF 1.248
Liu Xiaofang,Zeng Shangjing,Wang Runwei,Zhang Zongtao,Qiu Shilun
Hierarchical silicalite-1 zeolites were obtained from the direct conversion of a mixture of ground solid raw materials via a steam-assisted crystallization(SAC) method without involvement of any mesoscale template. Only a trace amount of water was necessary during the crystallization, implying that the amount of water can be dramatically reduced, which still offers easy separation and high yields. The simple procedure involved only grinding and heating, which not only saves resources and energy, but also significantly reduces the discharge of eco-friendly synthesis of zeolites for practical applications. Compared to conventional bulk silicalite-1, the nanosized hierarchical zeolites with MFI structure show enhanced removal capabilities for methylene blue owing to their hierarchical porosity.
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Food & Function
·
2018
·Vol. 9
·期 12
·6155-6164
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IF 3.289
Lang Zhang,Ya Fan,Hanwen Su,Li Wu,Yuying Huang,Lei Zhao,Bing Han,Guangwen Shu,Meixian Xiang,Jin-Ming Yang
The objective of this study was to investigate the anti-inflammatory effect of chlorogenic acid methyl ester (CME) and the molecular mechanism involved, through using non-infectious inflammation and infectious inflammation animal models as well as lipopolysaccharide (LPS)-stimulated mouse macrophage RAW264.7 cell models. Our results demonstrated that CME markedly inhibited ear swelling, paw swelling and granuloma swelling, and decreased intraperitoneal capillary permeability in non-infectious inflammation. Moreover, CME significantly alleviated the pathological damage of the lung tissue, reduced the levels of PGE2 and IL-1β in the serum and the protein expression levels of related-inflammatory factors in the lung tissue of LPS-induced mice with acute lung injury (ALI). In addition, CME affected the RAW264.7 cell cycle and inhibited the protein expressions of COX-2 and NLRP3 and prevented the phosphorylation of NF-κB p65 in RAW264.7 cells treated with LPS. These observations not only validated the anti-inflammatory effects of CME, but also revealed the underlying molecular basis, which involves the down-regulation of the expression of inflammatory factors and blockade of the COX-2/NLRP3/NF-κB signaling pathway.
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