JOURNAL OF POLYMER RESEARCH
·
2018
·Vol. 26
·期 1
·1-6
·
IF 1.434
Liang HuaQing,Li Sihan,Liu Dong,Liu Yijun,Long YongJiang,Liang GuoDong,Zhu FangMing
Herein, we demonstrated the synthesis and characterization of a well-defined diblock copolymer consisting of isotactic poly( p -hydroxystyrene) ( i P( p -HOS)) and 1,4- trans -polybutadiene (1,4- trans -PBD), i P( p -HOS)- b -1, 4- trans -PBD, by the combination of sequential monomer addition and deprotection. Isospecific living polymerization of p - tert - butyldimethylsilyloxystyrene and living trans -1,4-polymerization of 1,3-butadiene were catalyzed by 1, 4-dithiabutandiyl-2, 2ʹ-bis(6-cumenyl-4-methylphenoxy) titanium dichloride (complex 1) activated by methylaluminoxane (MAO) at room temperature to provide highly stereospecific isotactic poly( p - tert -butyldimethylsilyloxystyrene) ( i P( p -TBDMSOS)) and 1,4- trans -polybutadiene (1,4- trans -PBD) with narrow molecular weight distribution. Furthermore, the i P( p -TBDMSOS)- b -1, 4- trans -PBD was prepared via sequential monomer addition in the presence of complex 1 and MAO. The deprotection of the i P( p -TBDMSOS) block was promoted by concentrated hydrochloric acid to produce i P( p -HOS)- b -1, 4- trans -PBD. In addition, the resultant diblock copolymer and intermediate polymers were characterized by gel permeation chromatography, nuclear magnetic resonance and differential scanning calorimeter.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2018
·Vol. 20
·期 10
·1-11
·
IF 2.127
Feng Runliang,Deng Peizong,Zhou Feilong,Feng Sijia,Song Zhimei
To overcome honokiol’s poor water solubility and investigate its antifungal activity and pharmacokinetic property, Pluronic® F-127 (F127)-cyclodextrin conjugate was synthesized and employed to prepare honokiol-loaded micelles through emulsion-solvent evaporation method. The drug-loaded micelles were obtained with 92.30 ± 3.28% of encapsulation efficiency being higher than that obtained from F127 due to additional cyclodextrin inclusion. Fourier transformation infrared spectrometry and diffraction scanning calorimetry analysis tests demonstrated that honokiol was successfully encapsulated into the conjugate micelles in the amorphous or solid solution state because of their interactions. Meanwhile, in vitro antifungal activity experiment indicated that the MIC 90 of drug-loaded micelles was 64 μg/mL, showing the same antifungal activity as pure honokiol although it obviously retarded honokiol’s release. In vivo pharmacokinetic results confirmed that in vivo area under curve and apparent distribution volume of honokiol in drug-loaded micelles were 2- and 1.69-folds higher than that for pure honokiol, with its obvious prolonged mean retention time and half-life period, respectively. The clearance rate of honokiol was also shortened about 2-fold in comparison with pure honokiol when encapsulated into the micelles. These results suggest that the developed F127-cyclodextrin micellar formulation is a promising drug delivery system for antifungal drugs.
ᅟ
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 3
·2526-2534
·
IF 2.993
Zhou Zhan,Wang Zhuosen,Tang Yiping,Zheng Yuhui,Wang Qianming
Bacillus anthracis marker (dipicolinic acid, DPA) is a biological warfare agent. The excessive amounts of the compound would lead to serious problems in human health. It is essential to develop a straightforward and rapid detection technology of DPA. For this reason, an optical sensing platform was established on a robust alginate film. Firstly, green emission CQDs were synthesized via a one-step microwave carbonization method based on citric acid and urea. In the next step, europium ions were employed to chelate the carboxyl groups of CQDs and sodium alginate was selected to assemble the green fluorescent film (CQDs-Eu film). In the presence of DPA, the emission peaks evolved from green to red region. The ratio of I 615 / I 554 linearly increased with the addition of DPA in the range of 1–45 µM with a detection limit as low as 0.17 µM. This CQDs-Eu film-based sensing nanostructure showed its potential applications in the fields of biology and food analysis.
✓ 已验证
产品关联
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2018
·Vol. 296
·期 11
·1767-1776
·
IF 1.967
Yu Miao,Qiao Xiuying,Dong Xingjian,Sun Kang
A series of shear thickening fluids based on the modified silica nanoparticles by silane coupling agent, stearic acid, and titanate suspended in polyethylene glycol (PEG) were prepared, and the effects of particle modification on the shear thickening behaviors of these fluids were investigated. It can be found that the modification obviously decreases the particle agglomeration, improves the particle dispersion property, and increases the maximum particle concentration in fluid but leads to the reduction of the viscosity and shear thickening effect of the fluids due to the decrease of particle interactions. The modified silica fluids exhibit stronger structural recovery ability and shear thickening reversibility even after multiple shear breakage.
✓ 已验证
产品关联
DOI
高影响因子
Food Analytical Methods
·
2018
·Vol. 12
·期 2
·381-393
·
IF 2.245
Sun Xiao-Dong,Wu Hai-Long,Liu Zhi,Chen Yue,Liu Qian,Ding Yu-Jie,Yu Ru-Qin
A rapid and sensitive analytical strategy combining high-performance liquid chromatography-diode array detection (HPLC-DAD) and chemometrics methods was developed for the determination of multi-class food additives in a variety of beverage samples. Different kinds of beverages, which contain diverse unknown interferences, can be directly injected into a chromatographic system after a simple dilution or pretreatment step, and the data were recorded in a short time under a simple gradient elution mode. Although peaks overlapped and changeable interferences existed in the dimension of the chromatographic and spectral in real beverages, all food additives were accurately resolved by using a second-order calibration method based on alternating trilinear decomposition (ATLD) algorithm, and accurate chromatographic profiles, spectral profiles, and concentration profiles were also obtained. Limits of detection for all additives were between 1.40 and 165.1 ng mL −1 , while limits of quantitation ranged from 4.20 to 500.2 ng mL −1 . The spiked recoveries were in the range of 87.3–103% (except amaranth) with RSDs less than 10.2%. Compared with the results obtained by classic HPLC method, our proposed method was more accurate. In all, the proposed method is fast, sensitive, and universal and could be used as a reliable tool to determine food additives and quality monitoring in different complex beverages.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
·
2018
·
IF 2.869
Min Tao,Li Zhang,Yinlong Guo
A novel dual-channel enzymatic inhibition measurement (DEIM) method was developed to improve the repeatability with light/heavy isotope substrates, producing reliable relative standard deviations (< 3%) by employing acetylcholinesterase (AChE) as the model enzyme. The matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF MS) was adapted for enzyme-inhibited method due to its good salt-tolerance and high throughput; meanwhile, dual-channel enzymatic reactions were performed to improve the repeatability of each well. The acetylcholinesterase inhibition measurement was conducted by mixing the quenched enzyme reaction solution of blank group (with heavy isotope as substrate) and experimental group (with light isotope as substrate), of which the inhibition rate might be affected by isotope effects. Hence, inverse study and Km measurement were implemented to validate the method. The inverse study shows similar inhibition rate (68.9 and 70.3%) and the Km of isotope substrates are analogous (0.139 and 0.135 mM), which demonstrated that the novel method is feasible to AChE inhibition measurement. Finally, the method was applied to herb extracts, half of which exhibit inhibition to AChE. The precise dual-channel enzymatic inhibition measurement (DEIM) method could be regarded as a promising approach to potential enzyme inhibitor screening.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FIBERS AND POLYMERS
·
2018
·Vol. 19
·期 8
·1715-1725
·
IF 1.353
Deb Hridam,Xiao Shili,Morshed Mohammad Neaz,Al Azad Shamim
We report a facile approach to fabrication and characterization of cationic titanium dioxide (TiO 2 + ) on poly (vinyl alcohol)/poly (acrylic acid) (PVA/PAA) composite electro-spun nanofibrous mat. The aim of this study is to develop a “functional electrospun nanofibrous mat” as a sustainable approach to superior photocatalytic degradation of organic colorants. For that, the PVA/PAA nanofibrous mat was prepared by electrospinning of PVA and PAA solution according to an aspect ratio of 1:1 and later water stability was induced by the thermal cross linking at an elevated temperature of 145 °C for 30 minute. By means of electrostatic layer-by-layer (LbL) assembly, cationic titanium dioxide (TiO 2 + , ~19 nm) was immobilized on the surface of the water stable nanofibrous mat. As functionalized composited nanofibrous mat was characterized by using scanning electron microscope (SEM), fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) analysis and thermogravimetric analysis (TGA). Superior competency of the functionalized nanofibrous mat towards photocatalytic degradation of organic dye (methyl blue) in aqueous solution was observed by using UV-visible spectrophotometer with quantitative measuring method. The result indicates a complete degradation of methyl blue within 40 mins and superior reusability upto 5 cycles application. The study signifies the prospect of using electrospun nanofibers to manipulate the catalytic activity, which could be a foundation for further rational design of various composite nanofibrous materials.
✓ 已验证
产品关联
DOI
高影响因子
INFLAMMATION
·
2018
·Vol. 41
·期 6
·2068-2078
·
IF 2.884
Zhou Qin,Gong Xia,Kuang Ge,Jiang Rong,Xie Tianjun,Tie HongTao,Chen XiaHong,Li Ke,Wan JingYuan,Wang Bin
Ferulic acid (FA), derived from fruits and vegetables, is well-known as a potent antioxidant of scavenging free radicals. However, the role and underlying mechanism of FA on kidney ischemia reperfusion (I/R) injury are limited. Here, we explored the effects of FA on kidney I/R injury. The kidney I/R injury models were carried out by clamping bilateral pedicles for 35 min followed by reperfusion for 24 h. Mice were orally pretreated with different doses of FA for three times 24 h before I/R. The renal function was assessed by serum creatine (Scr) and blood urea nitrogen (BUN). Kidney histology was examined by hematoxylin and eosin (HE) staining and terminal deoxynucleotidly transferased UTP nick-end labeling (TUNEL) assay. Proinflammatory cytokines, caspase-3 activity, adenosine generation, adenosine signaling molecules, and hypoxia inducible factor-1 alpha (HIF-1α) were also detected, respectively. The siHIF-1α adenovirus vectors were in vivo used to inhibit the expression of HIF-1α. The results showed that FA significantly attenuated kidney damage in renal I/R-operated mice as indicated by reducing levels of Scr and BUN, ameliorating renal pathological structural changes, and tubular cells apoptosis. Moreover, FA pretreatment inhibited I/R-induced renal proinflammatory cytokines and neutrophils recruitment. Interestingly, the levels of HIF-α, CD39, and CD73 mRNA and protein as well as adenosine production were all significantly increased after FA pretreatment in the kidney of I/R-performed mice, and inhibiting HIF-α expression using siRNA abolished this protection of FA on I/R-induced acute kidney injury as evidenced by more severe renal damage and reduced adenosine production. Our findings indicated that FA protected against kidney I/R injury by reducing apoptosis, alleviating inflammation, increasing adenosine generation, and upregulating CD39 and CD73 expression, which might be mediated by HIF-1α.
✓ 已验证
DOI
PubMed
高影响因子
Nanoscale Research Letters
·
2018
·Vol. 13
·期 1
·1-9
·
IF 3.125
Chu Fangjia,Yan Sheng,Zheng Jiangen,Zhang Lingjun,Zhang Haiyan,Yu Keke,Sun Xiaonan,Liu Anping,Huang Yingzhou
With high sensitivity at single molecule level, surface-enhanced Raman scattering (SERS) is considered as an ultrasensitive optical detection technology with broad application prospects in lots of fields. However, the complicated fabrication and unaffordable price of SERS substrate are still a roadblock on the way to be widely used in industry. In this work, the SERS spectra on a commercial laser engraved Teflon (PTFE) film with engraved microarray are investigated. The wettability of film surface modulated by laser engraving make the microarray have the ability to decrease the contact area on film surface while water evaporation. The SEM image of the engraved area points out the micro/nanostructures generated engraving process is crucial to its superhydrophobic property. The probing molecules (i.e., methylene blue and rhodamine6G) were utilized to investigate with the limit of detection (1 × 10 −14 M). Furthermore, the biomolecule (bovine serum albumin) was used to demonstrate its benefits in biological applications. The measured intensities of Raman spectra on this PTFE with laser engraved microarray demonstrate its potential value for a SERS substrate. Our work on this simple, cheap SERS substrate with high sensitivity has a great commercial value and plenty of application in lots of fields.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2018
·Vol. 125
·期 2
·923-936
·
IF 1.515
Shiwei Wang,Qibao Wang
Ytterbium triflate was immobilized on SBA-15 via chemical grafting and co-condensation and the catalytic performance of the immobilized ytterbium triflate for the selective conversion of glucose into lactic acid was investigated in this paper. The characterization results showed that ytterbium triflate was immobilized on SBA-15 successfully. It was found that the immobilized ytterbium triflate catalyst can catalyze the transformation of glucose into lactic acid effectively. The 58.01% yield of lactic acid was obtained from glucose at 200 °C. The HPLC analysis results of the products showed that the glyceraldehyde might act as an intermediate for the formation of lactic acid during the reaction. The immobilized ytterbium triflate catalyst was recycled for more than five times without noticeable loss in activity.
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 9
·1-9
·
IF 5.705
Liu Chao,Dong Jing,Ning Shixue,Hou Juying,Waterhouse Geoffrey I. N.,Cheng Ziqiang,Ai Shiyun
A novel sandwich-type electrochemical immunosensor for avian leukosis virus subgroup J (ALV-J) is described. The immunosensor was prepared by first modifying a glassy carbon electrode (GCE) with reduced graphene oxide that was functionalized with tannic acid and magnetite nanoparticles (rGO-TA-Fe 3 O 4 ). Primary antibodies (Ab 1 ) were then deposited on the modified GCE. Hollow zeolitic imidazolate framework (eZIF) crystals functionalized with tannic acid and carrying secondary antibodies (Ab 2 ) and horseradish peroxidase (HRP) were used for signal amplification. The hollow eZIF crystals were found to be an excellent carrier for both Ab 2 and HRP, prompting the wider use of metal organic frameworks in electrochemical sensing. Under optimal conditions, the immunoassay afforded a detection range from 152 to 10,000 TCID 50 mL −1 (where TCID 50 is the 50% tissue culture infective dose) and a low detection limit of 140 TCID 50 mL −1 (at S/ N = 3). The immunoassay is highly selective for ALV-J, and it demonstrates excellent reproducibility and operational stability. The practicability of the immunoassay for the fast detection of ALV-J was confirmed in experiments with spiked avian serum samples.
Schematic of a sandwich-type electrochemical immunosensor for avian leukosis virus subgroup J (ALV-J). It consists of reduced graphene oxide, tannic acid and magnetite as the sensing platform, and an etched zeolitic imidazolate framework carrying horseradish peroxidase for signal amplification.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 44
·期 9
·5091-5105
·
IF 1.674
Shi Xiang,Shi Hongxin,Wu Hongke,Shen HaiMin
A series of novel fluoroether-containing monomers has been designed and prepared based on the commercially available perfluoroalkyl ether acid fluoride. Treating acid fluoride with allyl alcohol, 2-hydroxyethyl methacrylate or N -allylmethylamine allowed for the direct formation of corresponding vinyl-containing fluorinated monomers. High yields of the fluorinated epoxy monomers could be obtained from acid chloride with glycidol; meanwhile, fluorinated diol was prepared from diethanolamine or 3-amino-1,2-propanediol. Moreover, fluorinated monoamine, fluorinated monoalcohol and fluorinated dichloride were also obtained. Most of these fluorinated monomers were liquid at room temperature and exhibited good solubility in common organic solvents.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）