FOOD HYDROCOLLOIDS
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2021
·
IF 9.147
Lina Yang,Jinghang Huang,Xinghui Wu,Li Li,Wenqi Cai,Lijie Zhu,Shengnan Wang,Hong Song,Danshi Zhu,Tao Ma,He Liu
The purpose of this study was to investigate the effects of interactions between gut microbiota and soy hull polysaccharides (SHPs) on the air-liquid interfacial activity. SHPs could be used as an energy source for gut microbiota metabolism, and within a certain concentration range, the acid production of gut microbiota had a SHP concentration dependence. In the process of interfacial adsorption, the polysaccharide concentration was negatively correlated with interfacial tension, and the simulated intestinal fluid viscosity and dilational modulus were positively correlated. The low concentration of SHPs had a greater impact on the diversity and structural composition of gut microbiota. 0.5% SHPs had a better effect on the proliferation of Lactobacillus . The gut microbiota degraded SHPs involved in the regulation of interfacial activity, which provided a new theoretical foundation for the utilization and absorption of polysaccharides in the intestine in vitro .
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ACS Applied Materials & Interfaces
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2020
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IF 8.758
Long Zhao,Qingxiang Xu,Zhiwen Shao,Yan Chen,Zhaoli Xue,Henan Li,Jianming Zhang
Triphenylamine (TPA) has often been used as a building block to construct functional organic materials yet is rarely employed in oxygen reduction reaction (ORR) due to its strong electron-donating ability. This versatile segment bears a three-dimensional spatial structure whose effect has not been fully explored in catalytic systems. To this end, five symmetric cobalt porphyrins with carbazole and TPA derivatives have been synthesized and their ORR performance has been evaluated in acid medium. It was found that all compounds produced mainly hydrogen peroxide in oxygen reduction, with CP1 attaching benzyl derivatives and XCP4 possessing TPA-carbazole substituents at the meso-position of porphyrin, showing similar but more positive ORR potential as compared to the other analogues. Importantly, XCP4 achieved the greatest response current and the largest electron transfer numbers and H2O2 yields among the investigated molecules. Detailed electrochemical measurements suggested that the dipole-induced partial charges on the porphyrin in tandem with the more exposed molecular orbitals on TPA contributed to this enhancement, with the former attracting more protons to the affinity of reactive sites and the latter increasing the collision frequency between the electrocatalyst and H+ in solution. This is the first attempt to integrate the intermolecular forces with more exposed molecular orbitals in altering the electrochemical process.
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NATURE MATERIALS
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2020
·Vol. 20
·期 2
·175-180
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IF 38.663
Chen Chengjian,Chi Zhenguo,Chong Kok Chan,Batsanov Andrei S.,Yang Zhan,Mao Zhu,Yang Zhiyong,Liu Bin
Commercial carbazole has been widely used to synthesize organic functional materials that have led to recent breakthroughs in ultralong organic phosphorescence 1 , thermally activated delayed fluorescence 2 , 3 , organic luminescent radicals 4 and organic semiconductor lasers 5 . However, the impact of low-concentration isomeric impurities present within commercial batches on the properties of the synthesized molecules requires further analysis. Here, we have synthesized highly pure carbazole and observed that its fluorescence is blueshifted by 54 nm with respect to commercial samples and its room-temperature ultralong phosphorescence almost disappears 6 . We discover that such differences are due to the presence of a carbazole isomeric impurity in commercial carbazole sources, with concentrations <0.5 mol%. Ten representative carbazole derivatives synthesized from the highly pure carbazole failed to show the ultralong phosphorescence reported in the literature 1 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 . However, the phosphorescence was recovered by adding 0.1 mol% isomers, which act as charge traps. Investigating the role of the isomers may therefore provide alternative insights into the mechanisms behind ultralong organic phosphorescence 1 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 .
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Yafei Sang,Yiwen Cao,Lizhi Wang,Wei Yan,Tianwen Chen,Jianhan Huang,You-Nian Liu
Due to the p-π conjugative effect between the nitrogen atom of the amide and the carbonyl, the amide carbonyl has much low reactivity and the Schiff base reaction between the amide and amine usually did not take place, but after the amide was polymerized, it's quite different. Herein, benzene-1,3,5-triyltris((9H-carbazol-9-yl) methanone) (HTCZ) is not able to have the Schiff base reaction with melamine . Surprisingly, after HTCZ was polymerized according to the Friedel-Crafts reaction, the resultant polymer PHTCZ-1 performed the Schiff base reaction with melamine successfully, and a kind of novel N-rich porous organic polymers , namely, PHTCZ-1-MA was successfully synthesized. Moreover, PHTCZ-1-MA owned much higher Brunauer-Emmett-Teller surface area (613 m 2 ·g −1 ) and pore volume (0.57 cm 3 ·g −1 ) with very high nitrogen content (42.39 wt%). The theoretical calculation showed that the positive charge of the carbonyl carbon increased by 18% after the polymerization, which greatly improved the reactivity of the carbonyl. Because of this amazing change, PHTCZ-1-MA was proven to be an excellent adsorbent for CO 2 capture (180 mg·g −1 at 273 K and 1.0 bar) and mercury(II) adsorption (335 mg·g −1 at 273 K). This study makes the impossibility possible and provides a unique synthesis strategy for the fabrication of a kind of N-rich porous organic polymers.
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SENSORS AND ACTUATORS B-CHEMICAL
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2020
·
IF 7.1
Weilu Liu,Fan Cui,Haifeng Li,Shuang Wang,Beibei Zhuo,Shuang Wang
A novel hybrid networks of molecularly imprinted poly(9-carbazoleacetic acid) and multi-walled carbon nanotubes (MWCNTs) was developed applying the electro-polymerization technique for the simultaneous voltammetric determination of dopamine and epinephrine. A carbazole derivative, 9-carbazoleacetic acid, was synthesized and used as a monomer for the first time. Owing to the introduction of carboxyl group, as well as the π-conjugated rigid plane structure of 9-carbazoleacetic acid, the molecularly imprinted poly(9-carbazoleacetic acid) afforded sufficient non-covalent interactions with the templates, enabled a good selectivity of the sensor. The MWCNTs acted as the supportive material for the molecularly imprinted poly(9-carbazoleacetic acid), resulted in the high specific surface area and high conductivity of the sensing interface. The as-prepared hybrid networks exhibited enhanced sensitivity and selectivity in the simultaneous voltammetric determination of dopamine and epinephrine. Experimental parameters involved in the sensor fabrication process were evaluated. A wide linear range of 0.04 ∼ 70 μM were obtained for the simultaneous detection of dopamine and epinephrine. The developed sensor, that requires only 100 μL samples for analysis, was applied to detect dopamine and epinephrine simultaneously in rat plasma sample. The recoveries were found in the range from 97.15 % to 105.5 %, indicating a promising potential in medical care and biological applications.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2020
·
IF 2.627
Cui-Ping Ye,Ya-Fei Qiao,Rui-Nan Wang,Wen-Ying Li
To identify the effect of solvents and anthracene on the purification of carbazole, the solvent crystallization of carbazole was investigated with xylene, chlorobenzene and tetrachloroethylene (TCE) as solvents under two forced circulation cooling (FCC) modes. The co-crystalline experimental data were obtained from runs carried out at different anthracene levels between 1% (mass) and 10% (mass). The results showed that a uniform flake carbazole crystal obtained when using xylene and chlorobenzene under the FCC-1 mode with gradual cooling rate. Nevertheless, fine flake crystals grown under shock cooling of FCC-2 mode. It is beneficial to improving the purity of carbazole with chlorobenzene as solvent under cooling mode of FCC-1. Anthracene could promote the growth of carbazole in solution, and it has a significant influence on the purification of carbazole.
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TALANTA
·
2020
·
IF 5.339
Lite Yang,Bihong Zhang,Bingjie Xu,Faqiong Zhao,Baizhao Zeng
An innovative electrochemical sensor for paracetamol (PCM) determination was fabricated by electropolymerization imprinting on three-dimension (3D) AuPd nanoparticles‒ionic liquid (IL) functionalized graphene‒carbon nanotubes nanocomposite (AuPd/GN-CNTs-IL) modified glassy carbon electrode. The GN-CNTs supported AuPd alloy nanoparticles were prepared via one-pot hydrothermal method in the presence of IL (i.e. 1-hydroxyethyl-3-methyl imidazolium bis[(trifluoromethyl) sulfonyl] imide), which not only promoted the formation of small AuPd alloy nanoparticles, but also acted as “spacer” to prevent the π-π stacking and aggregation of graphene sheets and carbon nanotubes . The resulting composite had large surface area and high electrocatalysis . The PCM imprinted poly(carbazole-co-pyrrole) exhibited good recognition to PCM and had high stability. Based on the synergic effect of PCM imprinted copolymer and 3D AuPd/GN-CNTs-IL nanocomposite, a highly selective and sensitive electrochemical sensor was established. It presented a good linear relationship from 0.10 to 10 μM with a low limit of detection of 50 nM (S/N = 3). The sensor could be applied to the detection of PCM in biological samples, with acceptable recoveries (84.5%–102%). In addition, it was successfully used to monitor the concentration of PCM in urine from a patient with fever cold.
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ACS Omega
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2020
·
IF 2.87
Xuemei Ma,Jing Jing,Jingbao Wang,Jingjing Xu,Zhiyong Hu
Subcritical water extraction (SWE) of pectin from fresh sunflower heads was optimized using the response surface methodology (RSM). The optimal conditions for the maximum yield of pectin (6.57 ± 0.6%) were found to be a pressure of 8 bar, temperature of 120 °C, time of 20 min, and liquid–solid ratio (LSR) of 7 mL/g. The degree of esterification (DE) of pectin was analyzed by titrimetry and Fourier transform infrared (FTIR) methods, which was low methoxyl pectin. The molecular weight (Mw), galacturonic acid (GalA) content, and surface tension of pectin were 11.50 kDa, 82%, and 45.38 mN/m (1.5% w/v), respectively. Moreover, thermogravimetric (TG) and differential scanning calorimetry (DSC) analysis confirmed that pectin had excellent thermal stability. FTIR and 1H NMR spectra confirmed its structure. This study demonstrated that SWE could be used as a productive and environmentally friendly method for extracting pectin from fresh sunflower heads.
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JOURNAL OF MATERIALS SCIENCE
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2020
·Vol. 55
·期 26
·11856-11869
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IF 3.553
Lu Yan,Chang Zhaosen,Zhang Shizhen,Wang Shunli,Chen Qi,Feng Lijuan,Sui Zhuyin
Abstract Cycloaddition reaction using CO 2 as a starting material to form a cyclic carbonate has been applied to chemical fixation of CO 2 . In order to further increase the reaction efficiency, herein, a bifunctional catalyst ( CPBrs ) containing metalloporphyrin and quaternary phosphonium salt groups was prepared, and the related catalytic performance for CO 2 conversion was also studied. The catalytic system possesses multiple active sites of zinc porphyrin (Lewis acids) and quaternary phosphonium bromide salts (nucleophilic reagents), which can cooperatively work together to enhance the efficiency of cycloaddition reaction. At the same time, CPBrs ( CPBr-1 and CPBr-2 ) are microporous polymers with permanent microporous pore structure and high specific surface areas (342–370 m 2 g −1 ). Their moderate capacities (5.76 and 8.81% at 1 bar/273 K) to capture carbon dioxide were also beneficial for CO 2 conversion. The activity of the bifunctional catalyst is higher than that of the catalyst with a single component. The corresponding highest yield to catalyze cycloaddition reaction between methyl substituented propylene oxide and CO 2 is up to 95% (2.5 MPa, 90 °C). What is more, the porous nature of catalysts provides the recoverability of the catalyst, and the efficiency of the catalyst CPBr-2 remains high (above 90% yield) after five catalytic recycle. Graphic abstract
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JOURNAL OF LUMINESCENCE
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2020
·
IF 3.28
Kaiyao Shi,Yang Liu,Jingru Ma,Yuqing Zhao,Liang Liu,Jingying Wang
In this paper, five boron dipyrromethene dyes were designed with aromatric-amine-cored structure. Their molecular structure and photophysical performance were discussed in detail in various solvents. It was found that these five dyes were highly fluorescent ones in toluene with emission quantum yield higher than 95%. Amplified spontaneous emission (ASE) performance of these fluorescent dyes was then analyzed in toluene. Efficient and promising ASE spectra peaking at ~545 nm were observed for four of these fluorescent dyes with full width at half maximum value of ~5 nm and ASE efficiency up to 9%. It was confirmed that aromatric-amine-cored structure was positive to improve ASE performance. The reason for ASE missing in one of these fluorescent dyes was revealed as the vibrational relaxation of its N–H group. In solvent MeCN, however, this dye showed an interesting phenomenon, emission turn on effect towards Hg(II). Its sensing performance and sensing mechanism were discussed in detail as well. Good linear response and high selectivity were found for both colorimetric sensing and emission turn on sensing.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Yan Chen,Zhao Mo,Xingtong Zhu,Qingxiang Xu,Zhaoli Xue,Henan Li,Hui Xu,Long Zhao
Three triphenylamine (TPA) substituted dichromophoric zinc porphyrins XZP1–3 and a single zinc porphyrin ZP1 have been rationally designed to construct dye-sensitized TiO 2 nanoparticles to explore the feasibility of dichromophoric dye design for photocatalysis. TPA, N,N -diphenyl-(1,1′-biphenyl)− 4-amine and a carbazole-diphenylaniline derivative are attached to the meso -position of porphyrin core as the second chromophore. The electronic structure of the porphyrins is studied by density functional theory (DFT) calculations and the dye-sensitized composites are investigated using couples of spectral and electrochemical techniques . XZP2/TiO 2 exhibits the smallest charge transfer resistance and the longest electron lifetime among the investigated composites. The same catalyst performs the highest efficiency in photodegradation of both acid black (AB1) and tetracycline (TC) polluted water samples. Electronic paramagnetic resonance and radical quenching experiments reveal that the priority reactive species are superoxide radicals (•O 2 − ) and holes (h + ), suggesting the efficient charge separation at the porphyrin-sensitized TiO 2 interface. This work demonstrates the facilitated interfacial charge separation using dichromophoric dye-sensitized semiconductor particles for photodegradation and, the insights should aid in dyad design for photocatalysis application.
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Journal of Cleaner Production
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2021
·
IF 9.297
Wensong Chen,Jiaming Luo,Xing Du,Luhui Ding,Wenxiang Zhang
Gravity-driven biomimetic membrane (GDBM) has been developed as a promising membrane separation technology regarding ecological water treatment . Given its catalytic function on micro-pollutant removal and fouling control, detailed mechanism for fabrication material influence, organic micro-pollutants (OMPs) degradation, and operation strategy optimization have not been clear so far. In this work, the GDBM performance with various activated carbon (AC) materials (wood, coal, column and powder AC), and hydrostatic heights were investigated and verified. The activated carbon-gravity driven biomimetic membrane (AC-GDBM) fabrication tests demonstrated that AC-GDBM with powdered wooden AC had better filtration performance (up to 55 LMH flux and 97.5% removal rate) than AC-GDBM with other ACs. Furthermore, the effects of operation strategies (AC dosage, lacasse dosage, carbamazepine (CBZ) concentration, hydraulic height and rotating speed) on the filtration performance of AC-GDBM were conducted. At 25 g m −2 AC dosage, 30 g m −2 lacasse dosage, 10 mg L −1 CBZ concentration, and 5 cm hydraulic height, the optimized flux and removal rate were obtained. Further investigation revealed the surface morphology and property of AC-GDBM, displaying that powdered wooden AC and laccase formed the even biomimetic layer on base membrane. Additionally, for treating various OMPs (CBZ, tetracycline hydrochloride (TET), quinolones (norfloxacin (NFX)), and sulfonamides (sulfamethoxazole (SMZ))), with the optimized conditions, the removal rate and flux of AC-GBDM could maintain at high levels. This study demonstrates an example of a niche application , where GDBM is expected to offer a highly efficient and cost-effective ecological water treatment technology .
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