JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 23
·14469-14482
·
IF 3.442
Gao Xing,Gong Xinchao,Nguyen Tat Thang,Du Wenxin,Chen Xueqi,Song Zihui,Chai Rusong,Guo Minghui
In this study, a luminescent material of wood-based carbon quantum dots (CQDs)/Ce 0.7 Zr 0.3 O 2 with a regular, uniform shape, and a high color purity was synthesized by a facile method. Ce x Zr 1− x O 2 solid-solution oxides ( x = 0.7) were prepared by a hydrothermal method, and CQDs were adsorbed on the as-obtained Ce 0.7 Zr 0.3 O 2 nanoparticles. The crystal structure was identified by powder X-ray diffraction and Rietveld refinement. In addition, the effect of adsorbed CQDs on the luminescence properties of Ce 0.7 Zr 0.3 O 2 was systematically investigated by Raman spectroscopy, elemental analysis, electron spin resonance spectroscopy, and photoluminescence spectroscopy, as well as decay curve and quantum yield (QY) measurements. Herein, a promising strategy of surface engineering, that is, reduction of the surface defect concentration in Ce 0.7 Zr 0.3 O 2 by the adsorption of CQDs to decrease the nonradiative transition processes at defect sites was described. As expected, the adsorption of CQDs decreased the Ce–O bond length and the surface defect concentration of Ce 0.7 Zr 0.3 O 2 , thereby effectively decreasing the nonradiative transition processes and suppressing fluorescence quenching. Hence, CQDs/Ce 0.7 Zr 0.3 O 2 with a perfect cubic structure exhibits a performance improvement in terms of the luminescence and QY value. Furthermore, a light-emitting diode device was fabricated using as-synthesized CQDs/Ce 0.7 Zr 0.3 O 2 , emitting apparent yellow light with a high color purity (93.3%), with International Commission on Illumination coordinates of (0.5239, 0.4531), and a low correlated color temperature (2271 K) under a driven current of 60 mA, suggesting that CQDs/Ce 0.7 Zr 0.3 O 2 exhibits potential for practical applications.
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高影响因子
MACROMOLECULAR RESEARCH
·
2019
·Vol. 27
·期 11
·1144-1154
·
IF 1.758
Zhou Jinsheng,Lin Yanming,Ye Lin,Wang Ling,Zhou Li,Hu Huiyuan,Zhang Qilong,Yang Hui,Luo Zhongkuan
To solve the biofouling problem of polyvinyl alcohol (PVA) hydrogel as the artificial cornea, glycidyl methacrylate (GMA) and 2-hydroxypropyltrimethyl ammonium chloride chitosan (HACC) were grafted on the surface of PVA hydrogel via a new method of photoinduced electron transfer—reversible addition fragmentation chain transfer (PET-RAFT) polymerization and ring-open reaction. Both attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), scanning electron microscope (SEM), and thermogravimetric analysis (TGA) confirmed that GMA and HACC were successfully grafted on the surface of PVA hydrogel. A series of experiments to test the hydrophilicity of PVA hydrogel showed that it became hydrophobic due to the introduction of hydrophobic groups after grafting with GMA and HACC. In addition, cytotoxicity in vitro of PVA-g-p(GMA-HACC) hydrogel could be considered as not cytotoxicity according to ISO 10993-5: 2009. The anti-fouling property of hydrogel decreased after grafting with GMA due to the hydrophobic surface, while increased after grafting with HACC due to the steric repulsion of p(GMA-HACC) polymer brush. It’s no doubt that PET-RAFT was a feasible and reliable surface modification method which could be used in many biomolecules due to the excellent advantages.
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高影响因子
JOURNAL OF ANTIBIOTICS
·
2019
·Vol. 72
·期 10
·736-743
·
IF 2.446
Xi Xuedong,Lu Xingzhong,Zhang Xiaodong,Bi Yuhui,Li Xiaochun,Yu Zhiguo
Two novel depsipeptides xenematides F and G ( 1 , 2 ), were isolated from entomopathogenic Xenorhabdus budapestensis SN84 along with a known compound xenematide B. The structures of the two new molecules were elucidated using NMR, MS and Marfey’s method. The xenematide G ( 2 ) contains α-aminoheptanoic acid, a non-protein amino acid that is rarely found in secondary metabolites from entomopathogenic bacteria. Xenematides F and G were tested for antibacterial activity. Xenematide G ( 2 ) exhibited moderate antibacterial activity.
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PubMed
高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 12
·7507-7522
·
IF 3.917
Yang Jing,Pu Yi,He Hongwei,Cao Renguang,Miao Dagang,Ning Xin
In this study, a superhydrophobic cotton nonwoven fabric for oil–water separation was prepared by graft polymerization of siloxane under atmospheric pressure plasma in the medium of Air, N 2 or O 2 . The effects of different process conditions on the contact angle, surface morphology, stability of the hydrophobic coating and the growth of nano-particles were investigated. This modified cotton nonwoven was tested for self-cleaning and oil–water separation efficiency. The surface characteristics of the prepared cotton nonwoven were systematically analyzed using scanning electron microscopy, Energy Dispersive X-ray Spectroscopy, and Fourier transform infrared spectroscopy. The water contact angle of treated nonwoven was up to 155°, and the precursor and jet movement speed have great influences on the surface morphologies and stability of the coating. Separation efficiency for oil–water mixture is higher than 97% and can be repeated for at least 10 times. Moreover, the superhydrophobic nonwoven treatment showed excellent stability toward strong acid and alkaline conditions, the resulting fabrics may be used under harsh environmental conditions.
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高影响因子
CHEMICAL PAPERS
·
2019
·Vol. 73
·期 10
·2583-2589
·
IF 1.246
Zhao Li-Ping,Liu Gang,Zhang Peng,Sun Li-Qun,Cong Li-Na,Lu Wei,Sun Qi-Qi,Xie Hai-Ming,Wang Hong-Yu
Titanium disulfide (TiS 2 ) was adopted as a negative electrode material for the asymmetric sodium-ion supercapattery of TiS 2 /activated carbon using Na + -based organic electrolytes. This type of supercapattery possesses a working voltage as high as 3 V. The physical properties of the negative electrode were characterized by X-ray diffraction, scanning electron microscopy and X-ray photoelectron spectroscopy. The electrochemical performance tests revealed that the supercapattery had a relatively high rate performance and good cycle stability, displaying 77% capacity retention after 1000 cycles at a current density of 0.2 A g −1 .
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高影响因子
JOURNAL OF INDUSTRIAL MICROBIOLOGY & BIOTECHNOLOGY
·
2019
·Vol. 46
·期 6
·809-818
·
IF 2.993
Bai Yunfan,Gao Yuran,Lu Xin,Wang Huiyu
The biological membrane lipid composition has been demonstrated to greatly influence the secretion of secondary metabolites. This study was conducted to investigate the periodical alterations of whole cellular lipids and their associations with secondary products in Trichoderma brevicompactum. An electrospray ionization–mass spectrometry-based lipidomics strategy was used to acquire the metabolic profiles of membrane lipids during fermentation. Univariate analyses showed that most fungi glycerophospholipids were significantly altered at the early phase compared with the late phase. In addition, correlation analyses showed high correlations between phosphatidylcholine alterations and fermentation duration. In addition, the fermentation-associated alterations of phosphatidylcholines were found to be in accordance with the degrees of unsaturation of acyl-chains. Harzianum A reached a maximum on the 12th day, while trichodermin and 6-pentyl-2H-pyran-2-one showed the highest abundances on the 9th day, both of which were inclined to correlate with the alterations of phosphatidylcholines and phosphatidylethanolamines, respectively. These findings demonstrated that the alterations of the membrane lipid species in Trichoderma spp. were associated with the fermentation phases and might influence the secretion of specific secondary products, which may be useful in studying the optimization of secondary products in Trichoderma spp.
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PubMed
高影响因子
JOURNAL OF NANOBIOTECHNOLOGY
·
2019
·Vol. 17
·期 1
·1-11
·
IF 5.345
Hou Zhanwu,Wang Zhen,Liu Run,Li Hua,Zhang Zhengyi,Su Tian,Yang Jeffy,Liu Huadong
Background Gold nanoparticles (AuNPs) have been proposed for many applications in medicine and bioanalysis. For use in all these applications, maintaining the stability of AuNPs in solution by suppressing aggregation is paramount. Herein, the effects of amino acids were investigated in stabilizing AuNPs by rationally designed peptide scaffolds.Results Compared to other tested amino acids, phosphotyrosine (pY) significantly stabilized AuNPs. Our results indicated that pY modified AuNPs presented a high level of stability in various solutions, and had good biocompatibility. When a pY-peptide was used in stabilizing AuNPs, the phosphate group could be removed by phosphatases, which subsequently caused the aggregation and the cargo release of AuNPs. In vitro study showed that AuNPs formed aggregation in a phosphatase concentration depending manner. The aggregation of AuNPs was well correlated with the enzymatic activity (R2 = 0.994). In many types of cancer, a significant increase in phosphatases has been observed. Herein, we demonstrated that cancer cells treated with pY modified AuNPs in conjunction with doxorubicin killed SGC-7901 cells with high efficiency, indicating that the pY peptide stabilized AuNPs could be used as carriers for targeted drug delivery.Conclusion In summary, pY peptides can act to stabilize AuNPs in various solutions. In addition, the aggregation of pY-AuNPs could be tuned by phosphatase. These results provide a basis for pY-AuNPs acting as potential drug carriers and anticancer efficacy.
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高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 8
·1-9
·
IF 5.479
Sun Leilei,Zhou Haifeng,Huang Dapeng,Wang Tao,Gao Peng,Sun Yuzhen,Zhou Guangjun,Hu Jifan
The balance between free oxygen radicals and antioxidant defense systems is usually assessed by an antioxidant capacity assay. A rapid and sensitive antioxidant capacity assay is described here. It is making use of NaYF 4 :Yb/Er@NaYF 4 core-shell upconversion nanoparticles (UCNPs) and potassium permanganate (KMnO 4 ). In this strategy, added KMnO 4 reduces the green (540 nm) emission of the UCNPs (under 980 nm photoexcitation) due to an inner filter effect. The antioxidants cysteine, ascorbic acid and glutathione (GSH) reduce the intense purple color of KMnO 4 because it is reduced to Mn(II) ion. Hence, the green upconversion fluorescence is restored after the addition of antioxidants. Figures of merit for this assay (for the case of GSH) include a detection limit of 3.3 μM, a detection range that extends from 10 μM to 2.5 mM, and an assay time of a few seconds. The assay was applied to the evaluation of antioxidant capacity in human plasma samples spiked with GSH and gave satisfactory repeatability and specificity.
Schematic presentation of a fluorometric assay based on inner filter effect (IFE) between upconversion nanoparticles (UCNPs) and potassium permanganate (KMnO 4 ) for the determination of antioxidant capacity in human plasma.
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高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 5
·1-8
·
IF 5.479
Lin Liping,Xiao Yanling,Wang Yuhan,Zeng Yongnian,Lin Zujin,Chen Xi
Carbon dots doped with nitrogen and copper have been synthesized via a hydrothermal method. They possess favorable peroxidase-like catalytic activity over a wide range of pH values and temperatures. Specifically, they were used to catalyze the oxidation of ortho- and para-phenylenediamine (OPD and PPD) by H 2 O 2 . The resulting products possess different colors (yellow for OPD and brown for PPD), which can be visually discriminated. The corresponding typical absorption peaks of oxidized products for OPD and PPD are at 413 nm and 500 nm, respectively. The method displays excellent discrimination ability and selectivity over potential interferents. The detection limits are 1.1 μM for OPD and 1.9 μM for PPD. The respective linear ranges are from 5 to 200 μM for OPD and from 2.5 to 700 μM for PPD. The method was applied to the quantification of OPD and PPD in spiked natural waters.
Schematic presentation of the synthesis of nitrogen and copper co-doped carbon dots (N,Cu-CDs) and their application as an enzyme mimic for colorimetric discrimination of ortho-, meta- and para-phenylenediamine (OPD, MPD and PPD).
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高影响因子
METABOLIC BRAIN DISEASE
·
2020
·Vol. 35
·期 2
·373-383
·
IF 2.726
Zhou Yiying,Wu Xiang,Ye Luying,Bai Yujing,Zhang Hui,Xuan Zhenquan,Feng Yi,Zhang Panpan,Chen Yi,Yan Yushan,Zhu Binbin,Cui Wei
Postoperative cognitive dysfunction (POCD) is a common neurological disease affecting the elderly patients after surgery. Unfortunately, no effective treatment for this disease has been discovered. Edaravone, a clinical-used free radical scavenger, at 3 mg/kg has been reported to prevent neuroinflammation induced by the combination of surgery and lipopolysaccharide in adult rodents. However, we found that edaravone at such low concentration could not inhibit POCD in aged mice. Instead, edaravone at 33.2 mg/kg significantly prevented recognition and spatial cognitive dysfunctions in 14 month aged mice after abdominal surgery under general anesthesia with isoflurane. Furthermore, edaravone significantly prevented the increase of tumor necrosis factor-α (TNF-α), interleukin-1β (IL-1β) and interleukin-6 (IL-6) induced by abdominal surgery in aged mice. Edaravone could also decrease glial fibrillary acidic protein (GFAP) and ionized calcium binding adaptor molecule-1 (Iba-1) positive areas in the hippocampal regions of surgery mice, suggesting that edaravone might inhibit surgery-induced over-activation of microglia and astrocytes. Moreover, edaravone substantially increased the expression of PSD-95 and pSer9-glycogen synthase kinase-3β (pSer9-GSK3β) as demonstrated by Western blotting assay. Furthermore, the activity of acetylcholinesterase (AChE) is decreased in the mice in edaravone group. All these results suggested that edaravone at high concentrations could inhibit surgery-induced cognitive impairments in aged animals, possibly via the attenuation of neuroinflammation, the increase of synaptic proteins, and the elevation of cholinergic transmission, providing a further support that edaravone might be developed as a treatment of POCD.
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高影响因子
CATALYSIS LETTERS
·
2019
·Vol. 150
·期 2
·322-331
·
IF 2.372
Wang Kaifeng,Liu Ya,Wu Wufeng,Chen Yu,Fang Lina,Li Wanbin,Ji Hongbing
Abstract In this study, Zr-MOF material (UiO-66) was modified with different metal oxides (CeO 2 , Ga 2 O 3 , and CoO) and employed in the conversion of cellulose to levulinic acid (LA) in aqueous medium. The research results showed that the introduction of the metal oxides increased the acid content of the catalysts, especially in medium-strong acid. The selectivity of LA was related to the type of metal oxide and the content of medium-strong acid. Due to the activity of Ga 2 O 3 and more medium-strong acid, the yield of LA reaches a maximum yield of 32.0 mol% at 513 K for 360 min when Ga 2 O 3 -UiO-66 was employed as the catalysts. The combination of metal oxide and UiO-66 enables the reaction to proceed, providing a new direction for the conversion of cellulose to LA in the aqueous phase. Graphic Abstract In this study, Zr-MOFs material (UiO-66) was modified with different metal oxides (CeO 2 , Ga 2 O 3 , and CoO) and employed in the conversion of cellulose to levulinic acid in aqueous medium. The results indicated that the addition of metal oxides changes the acidity of UiO-66, which improves the catalytic activity. The selectivity of LA was related to the type of metal oxide and the content of medium-strong acid.
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高影响因子
IONICS
·
2019
·Vol. 26
·期 2
·579-588
·
IF 2.289
Guan Huibin,Zeng Tianbiao,Zhang Chuhong
SnS 2 -based materials are potential anodes of sodium ion batteries (SIBs) due to their high specific capacity, high theoretical coulombic efficiency, and low toxic. Herein, we demonstrate an effectual strategy to improve the integral electrochemical performances of SnS 2 /C by decreasing crystallinity; the Na ions diffuse coefficient, reversible capacity, and rate capacity were increased by a large margin. At 100 mA g −1 , un-milled SnS 2 /C, direct-milled SnS 2 /C, and SnS 2 /C milled with NaCl were delivered about 311, 384, and 509 mAh g −1 at 100th cycle, and at 500 mA g −1 , the capacity vanish ratio in corresponding SnS 2 /C were 0.414%, 0.552%, and 0.292% per cycle from 2nd to 100th cycle. It is expected that the simple synthesize method may provide some inspiration to SnS 2 -based anode research.
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