JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Huan Ling,Xiaowen Wu,Ke Li,Fengyu Su,Yanqing Tian,Dan Luo,Yan Jun Liu,Xiao Wei Sun
Electrochromic (EC) devices with reversible transmittance switching have promising prospects in the applications of photoelectric displays. Herein, a novel air-stable and high contrast solution-phase electrochromic device based on new viologen derivative (DPB) with A-D-A structure (A: acceptor; D: donor) was demonstrated. Devices possessed simple configuration of ITO/EC solution/ITO. Ferrocene and polycarbonate (PC) were selected as the complementary material and solvent, respectively. All of the fabrications and performance testing work were conducted in normal air condition. The DPB-based device showed deep magenta color in colored state and exhibited high optical contrast of ΔT of 72.2% (517 nm) and good coloration efficiency of 102.2 cm 2 /C at 1.8 V. The device appeared only slight degradation of ΔT (ΔT = 69.6% or retained 96.7% of its initial ΔT after 5000 s constant switching) under the normal air atmosphere, which was even better than some reported well-packaged viologen-based solution ECDs. Additionally, the UV–vis reflective spectra were also conducted to assess the reflectance property of the devices. The reflectance peak (ΔR = 2.6%) and absorption peak matched accurately, which indicated that the new viologen derivative possesses the potential application in reflective electrochromic devices.
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Qi Wang,Lingfang Li,Tingxuan Wu,Xiangpeng Kong,Qingguo Ma,Chunlei Ma
Taking consideration of metal-induced fluorescence quenching and excellent coordination effect of D-penicillamine (D-PA), a graphene quantum dots (GQDs)-based fluorescent switch for D-PA detection was designed and established firstly with the help of lead ions . GQDs obtained from citric acids made them rich in carboxyl and hydroxyl groups , giving GQDs the ability to combine with lead ions. As anticipated, the fluorescence intensity was quenched by Pb 2+ through electron transfer process. Further, the addition of D-PA effectively recovered the fluorescence due to the departure of Pb 2+ from GQDs aroused by the strong coordination between D-PA and Pb 2+ . Thus, a fluorescent switch was activated for D-PA detection. The fluorescence recovery efficiencies were found to be proportional to the concentration of D-PA in the range of 0.6–50 μmol L − 1 and the detection limit was 0.47 μmol L − 1 . The real sample detection was performed in human urea sample and satisfactory recoveries of 96.84%–102.13% were obtained. The GQDs-Pb 2+ based fluorescent switch sensing method was firstly established with low detection limit and wide linear range, making it a supplement and improvement for D-PA detection.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Xiaoyan Guo,Shougang Fan,Yandi Hu,Xiaolin Fu,Huaiqi Shao,Qixing Zhou
D-amino acid (DAA) an environmentally friendly biofilm inhibitor, has low efficiency for membrane biofouling control due to its instability. To address this challenge, a novel nanocomposite was prepared with DAA adhering to polydopamine (PDA)-coated halloysite nanotube (HNTs) through the interactions of H-bonding and π-π stacking between PDA and DAA. Membrane modified with such nanocomposite was fabricated via blending phase inversion, and the nanocomposite was uniformly distributed in the modified membrane matrix. In comparison with the pristine membrane, the addition of nanocomposites resulted in robust mechanical property for modified membrane with the ultimate stress and strain increased by 23.97% and 35.62%, respectively. Moreover, an excellent tradeoff between water flux (2.5 folds of pristine membrane) and selectivity was achieved, probably due to the improved membrane hydrophilicity. Meanwhile, bovine serum protein (BSA) static adsorption as well as dynamic filtration experiments exhibited excellent antifouling ability of the modified membrane. Most importantly, a superior anti-biofouling stability over a 10-day period was obtained for the membrane modified with nanocomposite, indicating that the activity of DAA to mitigate biofouling was effectively maintained. This study developed a novel and promising strategy for membrane biofouling mitigation.
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Dongwei Miao,Dongkui Liu,Yanbo Zeng,Guobao Zhou,Wei Xie,Yiwen Yang,Hailong Wang,Jian Zhang,Yunyun Zhai,Zulei Zhang,Lei Li
A novel fluorescent biosensor based on dabcyl [(E)-4-((4-(dimethylamino) phenyl) diazenyl)benzoic acid] -modified anti-Mb aptamer (D-AMA) and 6-FAM(6-carboxyfluorescein) -modified complementary short chain (F-CSC)for the specific and sensitive detection of Mb levels is presented in this study. In PBS buffer solution, D-AMA bound to F-CSC, and then dabcyl quenched the fluorescence of 6-FAM. After adding Mb into the system, D-AMA bound to Mb and separated from F-CSC. The fluorescence of 6-FAM was restored after it separated from dabcyl. The assay exhibited high specificity and sensitivity toward Mb, with a low limit of detection of 0.07 ng/mL (S/N = 3) and linear relationships of 0.1–5 ng/mL. It was further applied to detect Mb levels in spiked human blood sera samples.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2018
·
IF 5.123
Yifan Chen,Juan Qiao,Qianrong Liu,Mingming Zhang,Li Qi
Papain-stabilized gold nanoclusters ( [email protected] ) with a red fluorescence emission at 639 nm have been generated successfully in aqueous solution. The fluorescence of [email protected] could be quenched in the addition of Cu 2+ . Subsequently, a unique fluorescent probe based on [email protected] 2+ complex has been constructed for sensitive, selective and “turn-on” detection of D-penicillamine (D-pen). The sensing probe has exhibited a remarkable fluorescence enhancement in the presence of D-pen, which can be measured ranging from 30.0 μM to 2.0 mM (r 2 = 0.991) with the detection limit of 5.0 μM. Furthermore, the developed assay has been utilized to explore the metabolic process of D-pen in rats after intraperitoneal injection. As far as we concerned, the present study has reported the first analytical method for sensing serum D-pen in real time by using the fluorescent [email protected] 2+ complex. Our strategy paves a way for digging up the biological and clinical application of the fluorescent AuNCs.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2018
·Vol. 19
·期 10
·3184
·
IF 3.687
Zhiwen Qi,Chengzhang Wang,Jianxin Jiang,Caie Wu
A series of novel C15 urushiol derivatives were designed by introducing a pechmann structure and F-, Cl-, and Br-nitro substituents with different electronic properties into its alkyl side chain, as well as a triazolyl functional group in its aromatic oxide. Their chemical structures were determined based on the analysis of the NMR (nuclear magnetic resonance) spectroscopic and mass spectrometric data. The results showed that compound4exhibited a strong inhibition of the HepG2 cell proliferation (half maximal inhibitory concentration (IC50): 2.833 μM to human hepatocellular carcinoma (HepG2), and 80.905 μM to human normal hepatocytes (LO2)). Furthermore, it had an excellent synergistic effect with levopimaric acid. The nitrogen atom of the triazole ring formed a hydrogen-bonding interaction with Gly103, Gly154, and Tyr308, which made compound4bind to histone deacetylase (HDAC)2 more tightly. One triazole ring and His33 formed a π–π stacking effect; the other, whose branches were deep into the pocket, further enhanced the interaction with HDAC2. Meanwhile, compound4involved a hydrophobic interaction with the residues Phe210 and Leu276. The hydrophobic interaction and π–π stacking provided powerful van der Waals forces for the compounds.Keywords:urushiol;triazole;diels-alder;pechmann;anti-tumor;HDAC2
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 66
·34944-34949
·
IF 3.708
Jintao Lin,Shuangyue Li,Mingzhong Sun,Cuili Zhang,Wenbo Yang,Zehui Zhang,Xiaojie Li,Shao Li
The economical production of biodiesel from lignocellulose hydrolysates requires a robust D-xylose fermentation path. The present work found that Lipomyces starkeyi AS 2.1560 and Rhodosporidium toruloides AS 2.1389 could produce micro-lipid effectively from D-xylose solution by a two-stage culture mode. Results demonstrated that both L. starkeyi and R. toruloides could achieve high lipid production in xylose solution. High cell density fermentation was carried out by a feed-batch fermentation mode. After fermentation for 48 h in a bioreactor using unsterile xylose solution by L. starkeyi, the biomass, lipid and lipid content reached 97.4 g L−1, 63.9 g L−1, and 65.5%, respectively. Accordingly, the lipid productivity reached 1.3 g L−1 h−1 in the second stage. And the overall lipid productivity was 0.55 g L−1 h−1. Therefore, L. starkeyi and R. toruloides are highly effective D-xylose-fermenting oleaginous yeasts for lipid production in xylose solution. The two-stage culture method should provide a new opportunity to make the industrial production of biodiesel possible in the future.
✓ 已验证
产品关联
DOI
高影响因子
POLYMER BULLETIN
·
2015
·Vol. 72
·期 6
·1531-1543
·
IF 1.438
Zhou Zhihua,Huang Huihua,Huang Tianlong,Peng Cheng,Zhou Hu,Liu Qingquan,Zeng Wennan,Liu Lihua,Cao Dafu,He Siliang,Xiang Liujiao,Yan Hua
Novel maleated poly( d , l -lactide- co -glycolide) (MPLGA) was melt copolymerized directly from maleic anhydride, d,l -lactide and glycolide monomers with stannous octoate as catalyst and benzoyl peroxide as initiator. FTIR, 1 H NMR, GPC and maleation content were employed to qualitatively characterize the synthesized MPLGA. The effects of the catalyst dosage, reaction time and reaction temperature on weight average molecular mass, polydispersity index and maleation content of MPLGA were also investigated. The results indicated that the novel MPLGA was successfully obtained using melting-copolymerization method. MPLGA, with a weight average molecular mass of about 5.39 × 10 4 Da, a polydispersity index of 1.51 and a maleation content of 7.1 wt%, was obtained when polymerization was conducted with catalyst dosage of 0.03 wt% for 36 h at 140 °C. The results indicated that the introduction of maleic anhydride into PLGA may offer new and important options for biomaterial applications.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 36
·28233-28241
·
IF 3.84
Yuhe Xiu,Angjun Chen,Xuerui Liu,Chen Chen,Jizhong Chen,Li Guo,Ran Zhang,Zhenshan Hou
Novel polymer-supported Brønsted acid polymer catalysts have been successfully synthesized by radical polymerization, followed by a simple solvothermal route and ion exchange step. The as-synthesized co-polymers were characterized by Elemental Analysis, FT-IR spectroscopy, thermogravimetric analysis and scanning electron microscopy and then were employed as a heterogeneous catalyst for dehydration of sorbitol. Especially, the polymer catalysts have a unique advantage of adjustable Brønsted acidity, and the polymer with 1.82 mmol g−1 of Brønsted acidity was a very efficient catalyst for highly selective dehydration of sorbitol into 1,4-anhydro-D-sorbitol. The dehydration reaction can be completed within 4 h and the selectivity of 1,4-anhydro-D-sorbitol achieved 90%. Moreover, the present catalysts resisted acid-leaching and can be recycled in five consecutive cycles without obvious loss of activity.
✓ 已验证
产品关联
DOI
高影响因子
Soft Matter
·
2015
·Vol. 11
·期 31
·6266-6274
·
IF 4.029
Chen Chen,Yue-Cheng Qian,Chuan-bin Sun,Xiao-Jun Huang
The amphiphilic random copolymer poly(β-D-glucose-co-1-octyl)phosphazene (PGOP) can undergo continuous morphological transitions in DMF–water mixed solvents. In this study, the ratio of glucose moieties to octyl moieties was controlled via a two-step thiol–ene reaction. As a result, polyphosphazenes with glycosyl functionalization degrees of 58.1% (PGOP-1), 74.1% (PGOP-2) and 87.0% (PGOP-3) were obtained. These amphiphilic polyphosphazenes self-assemble in both water and water–DMF mixtures. Several self-assembled morphologies including spheres, rods and vesicles were formed though careful control of the water content (WC) in the DMF solvent as well as of the hydrophilicity or hydrophobicity of the copolymers. We also found that an increase in the hydrophobic proportion led to faster morphological transitions at a constant WC. The thermodynamics of micellization were also studied by Isothermal Titration Calorimetry (ITC), and the strong hydrophobic interactions in PGOP-1 were demonstrated by their highly exothermic nature. These self-assemblies have potential applications in biosensing, lectin adsorption and drug loading with controlled release.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2016
·
IF 4.035
Jun Fang Jiang,Juan Qiao,Xiao Yu Mu,Myeong Hee Moon,Li Qi
In this work, a unique D-amino acid oxidase reactor for enhanced enzymolysis efficiency is presented. A kind of magnetic polymer matrices, composed of iron oxide nanoparticles and porous polymer membrane (poly styrene-co-maleic anhydride), was prepared. With covalent bonding D-Amino acid oxidase on the surface of the matrices and characterization of scanning electron microscope and vibrating sample magnetometer, it demonstrated that the membrane enzyme reactor was successfully constructed. The enzymolysis efficiency of the enzyme reactor was evaluated and the apparent Michaelis-Menten constants of D-Amino acid oxidase were determined ( K m was 1.10 mM, V max was 23.8 mM min −1 ) by a chiral ligand exchange capillary electrophoresis protocol with methionine as the substrate. The results indicated that the enzyme reactor could exhibit good stability and excellent reusability. Importantly, because the enzyme and the substrate could be confined into the pores of the matrices, the enzyme reactor displayed the improved enzymolysis efficiency due to the confinement effect. Further, the prepared enzyme reactor was applied for D-Amino acid oxidase inhibitors screening. It has displayed that the proposed protocol could pave a new way for fabrication of novel porous polymer membrane based enzyme reactors to screen enzyme inhibitors .
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2016
·Vol. 34
·期 5
·563-577
·
IF 1.811
Dong Li-qi,Hu Du-fen,Duan Xue-min,Wang Zhi-peng,Zhang Kai-xin,Zhu Xiao-fei,Sun Hui,Zhang You-shan,Xu Jing-kun
Two pairs of amino-acid functionalized poly(3,4-ethylenedioxythiophene) (PEDOT) derivatives, namely, poly( N -(tert-butoxycarbonyl)- L -methionyl (3,4-ethylenedioxythiophene-2’-yl)methylamide) ( L -PEDOT-Boc-Met) and poly( N -(tert-butoxycarbonyl)- D -methionyl (3,4-ethylenedioxythiophene-2’-yl)methylamide) ( D -PEDOT-Boc-Met); poly( L -methionyl (3,4-ethylenedioxythiophene-2’-yl)methylamide) ( L -PEDOT-Met) and poly( D -methionyl (3,4-ethylenedioxythiophene-2’-yl)methylamide) ( D -PEDOT-Met) were synthesized via chemical oxidative polymerization of corresponding monomers. The structural characterization, spectroscopic properties and thermal stability of these monomers and polymers were systematically explored by FTIR spectra, Raman spectra, XRD spectra, UV-Vis spectra and thermogravimetric analysis. As chiral electrode materials, these polymers were employed to successfully recognize 3,4-dihydroxyphenylalanine (DOPA) enantiomers by cyclic voltammetry (CV) in sulphuric acid solution. The measurement results reveal that the tendency was hetero-chiral interaction between L -PEDOT-Met/PVA/GCE and D -DOPA, D -PEDOT-Met/PVA/GCE and L -DOPA, respectively. Also, the mechanism of chiral discrimination was discussed. All the results implied that the combination of electrochemical molecular recognition technology and chiral PEDOT materials can be a promising approach for chiral recognition and may open new opportunities for facile, biocompatible, sensitive and robust chiral assays in biochemical applications.
✓ 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）