FOOD CHEMISTRY
·
2024
·
IF 8.5
Xinmiao Wang,Qian Wang,Dong Cai,Jinghan Yu,Xuan Chen,Xu Guo,Peiyong Tong,Xiaoyang Liu,Fawen Yin,Dayong Zhou
HPLC-UV analysis was used to evaluate the enzymatic degradation characteristics of tyrosol acyl esters (TYr-Es) and alkyl gallates (A-GAs). Among various hydrolytic enzymes, TYr-Es can be hydrolyzed by pancrelipase, while A-GAs cannot be hydrolyzed by pancrelipase. Interestingly, carboxylesterase-1b (CES-1b), carboxylesterase-1c (CES-1c) and carboxylesterase-2 (CES-2) are able to hydrolyze TYr-Es and A-GAs, and thus to liberate tyrosol (TYr) and gallic acid (GA). By contrast, the degrees of hydrolysis (DHs) of TYr-Es and A-GAs by CES-1b and CES-1c were significantly higher than those by CES-2. Meanwhile, the DHs of TYr-Es were much higher than those of A-GAs. Especially, the DHs firstly increased and then decreased with the increasing alkyl chain length. Besides, DHs positively correlated with the unsaturation degree at the same chain length. Through regulating carbon length, unsaturation degree and the ester bond structure, controlled-release of phenolic compounds and fatty acids (or fatty alcohols) from phenolic esters will be easily achieved.
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高影响因子
Journal of Environmental Chemical Engineering
·
2020
·
IF 4.3
Qiyuan Chen,Lifen Liu
Emissions of volatile organic compounds (VOCs) air pollutants adversely affected human health and air quality. A novel reactor is designed by a bio-anode chamber with a PVDF/CFC diffusion membrane module and a catalytic air cathode chamber with persulfate and activated carbon fiber (ACF) based photocathode . Peroxysulfate is activated to generate oxidizing species that promote toluene removal and oxidation together with UV photolysis and photo-electrochemical catalysis. This new reactor as air pollution control technique is able to continuously remove toluene gas from an air stream that sequentially flows through firstly the cathode chamber where UV photolysis, photo-electrochemical (PEC) oxidation are integrated with activation of peroxymonosulfate (PMS), then flows through the bio-anode chamber where adsorption/diffusion and biodegradation take place in microbial fuel cell (MFC). This integrated system exhibits high efficiency in toluene removal (∼95 %, ∼100 ppm toluene) with stable power output (cell voltage: 0.40 V) under UV light illumination. In addition, the existence of reactive species such as OH, O 2 − and SO 4 - radicals are confirmed by EPR tests. The results show that both ·OH and SO 4 - are involved in the toluene oxidative degradation with the addition of PMS, where SO 4 - plays a predominant role, indicating that combination of photolysis, cathodic adsorption/oxidation with anodic adsorption/diffusion and biodegradation provides a promising way for VOCs removal and simultaneous electricity generation at room temperature.
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INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Mengmeng Zhu,Junbo Wang,Lei Hou,Yiwen Yuan,Lili Liu,Yaoqing Chu,Chunmei Huang
The design and syntheses of new birefringent crystals will be of great importance in commercial applications and materials science. A series of ultraviolet (UV) birefringent crystals, AX·(H2SeO3)n (A = K, Cs; X = Cl, Br; n = 1, 2), with large sizes up to 23 × 6 × 3 mm3, was successfully synthesized by simple aqueous solution method. These four compounds belong to three different space groups. Isomorphic KCl·(H2SeO3)2 and CsCl·(H2SeO3)2 crystallize in the P1¯ space group, while CsBr·(H2SeO3)2 and CsCl·H2SeO3 crystallize in the P21/m and P21/c space groups, respectively. They exhibit cocrystal structures composed of [2(H2SeO3)]∞ and [AX]∞ frameworks, ingeniously inheriting the large optical anisotropy of selenite and the wide band gap of alkali metal halide. And it proves that these compounds indeed possess large birefringence (0.1–0.17 at 532 nm) and short UV cutoff edges (227–239 nm), achieving a balance of optical properties. This research affords a simple and viable strategy for the design and syntheses of new UV birefringent crystals. Besides, it is also found that the n value and ionic size (A and X ions) have important influences on the crystal structures and optical properties of AX·(H2SeO3)n. And this will promote further understanding of the alkali metal halide selenite family.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Te Hu,Huijian Ye,Zhenggang Luo,Junjie Ma,Boyuan Zhang,Xuanhe Zhang,Jinwei Song,Qingping Wang,Lixin Xu
The use of stabilizer with designer structures can effectively promote graphite exfoliation in common solvents to render functionalized graphene desirable for their various applications. Herein, a hyperbranched polyethylene copolymer , HBPE@Py@Acryl, simultaneously bearing multiple pyrene terminal groups and pendant acryloyl moieties has been successfully synthesized from ethylene with a Pd-diimine catalyst based on unique chain walking mechanism. The unique structural design of the HBPE@Py@Acryl makes it capable of effectively promote graphite exfoliation in a series of common, low-boiling-point organic solvents , e.g. CHCl 3 , to render stable graphene dispersions with concentrations effectively adjustable by changing feed concentrations of graphite and polymer or sonication time. Meanwhile, it can be irreversibly adsorbed on the exfoliated graphene surface based on the π-π interactions between them to concurrently render acryloyl-functionalized graphene free of structural defects, with majority (92.7%) of them having a thickness of 2–3 layers. This allows us to obtain graphene electrothermal films simply by filtration and UV irradiation, which exhibit outstanding stability in use. The action mechanism of the HBPE@Py@Acryl as stabilizer for promoting graphite exfoliation and the role of UV irradiation on improving the stability in use of resulting graphene films have been elucidated.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Xiaoguang Qiao,Qianqian Hao,Meng Chen,Ge Shi,Yanjie He,Xinchang Pang
The utilizing light with broadband range has attracted lots of research interest for the photo induced reversible-deactivation radical polymerization (RDRP). However, it is still a challenge for a single catalyst to simultaneously respond to various lights with highly varied wavelengths. Here, we proposed a simple strategy for the preparation of a heterogeneous photocatalyst suitable for photo induced atom transfer radical polymerization (photoATRP) under full spectrum (from UV/vis light to NIR), by combining pyridine nitrogen doped carbon dots (N-CDs) and upconversion nanoparticles (UCNPs). In the presence of these robust UCNP@SiO2@N-CDs composite particles, the photoATRP could be carried on under the different irradiations of UV, blue, green, red, white, and 980 nm NIR light, with a low loading of part per million concentrations of the CuBr2/L catalyst. Moreover, the excellent solvent and aqueous compatibility allow UCNP@SiO2@N-CDs to be capable for photoATRP in both organic solvents and aqueous media, providing well-defined hydrophobic and hydrophilic polymers with low dispersity and excellent chain-end fidelity. In addition, the photoATRP with 980 nm NIR exhibited excellent penetrations through visible-light-proof barriers. The system could be used for the preparation of an injectable hydrogel that had dual curing and photoluminescence modes. Owing to the “living” characteristics of polymer chains achieved through ATRP, the hydrogel was capable to be easily repaired by using monomer as the binder.
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高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Wenkai Liu,Bin Liu,Xin Li
The aim of this study was to investigate the feasibility and fouling mitigation mechanisms of UV/Fe(II) synergistically activated sulfite (S(IV)) (UFS) pretreatment to alleviate membrane fouling caused by HA-enhanced Ca 2+ scaling. After UFS treatment, hydrophobic substances and carboxyl groups structure were destroyed by the in-situ-generated SO•–4, resulted in a significant reduction of hydrophobic substances ratio and carboxyl group concentration. Due to the formation of more electropositive in-situ-generated Fe(III), the complexation between Ca 2+ and carboxyl groups was weakened so that the bulk crystallization size on the membrane surface was greatly reduced. The filter cake enhanced osmotic pressure effect (CEOP) and concentration polarization effect were hence alleviated, as well as the surface roughness . At the microcosmic perspective, as the energy barrier between the membrane and foulants was increased significantly after pretreatment, the anti -foulants adsorption ability of the membrane was enhanced. Correlation analysis showed that the carboxyl concentration and density, HPO ratio, larger particle size (>100 nm) ratio, the Ca 2+ concentration in the scaling layer and energy barrier all had a good correlation with the membrane resistance. This research not only provides an advanced oxidation technology that can effectively alleviate the synergistically-fouling effect of HA and Ca 2+ of nanofiltration process, but also proposes a guidance for the UV/Fe(II) synergistically activated sulfite.
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ANALYTICAL LETTERS
·
2021
·
IF 2.329
Ya-Wen Ding,Shi-Lan Feng,Juan Chen
A novel magnetic reduced graphene oxide nanoribbons (Fe3O4 @RGONRs) composite was prepared and applied as an adsorbent of magnetic solid-phase extraction (MSPE) for the determination of four bisphenol endocrine disrupters in three carbonated beverages coupled with high-performance liquid chromatography (HPLC). The prepared Fe3O4@RGONRs composite was characterized by transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, vibrating sample magnetometry, nitrogen adsorption-desorption isotherms and zeta potential analysis. Fe3O4@RGONRs composite possessed an abundant π-electron system and interacted with the analytes by π-π stacking, hydrophobic interactions, and hydrogen bond. The MSPE parameters, including the mass of adsorbent, sample solution pH, extraction time, ionic strength, desorption solvent and desorption time, were evaluated. Under the optimal conditions, the proposed Fe3O4@RGONRs-based MSPE method exhibited good linearity with determination coefficients (R2) between 0.9994 and 1000 from 1.6 to 1000 µg L−1, low limits of detection from 0.33 to 0.87 µg L−1, and suitable accuracy with spiked recoveries from 81.88% to 115.73%. The excellent analytical performance, along with suitable batch-to-batch reproducibility and reusability, suggest potential applications in the field of sample pretreatment.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Fang Wang,Xiao-Ni Yao,Yao Guo,Liguo Yang,Yi-Gang Chen,Xian-Ming Zhang
Two new metal aluminium phosphate millimetre-crystals NaBa 2 Al(P 2 O 7 ) 2 and NaBaAl(PO 4 ) 2 were successfully grown by using high-temperature molten method. The crystals NaBa 2 Al(P 2 O 7 ) 2 and NaBaAl(PO 4 ) 2 are located in space groups P ¯1 and P 2 1 /c, respectively. NaBa 2 Al(P 2 O 7 ) 2 displays a [Al(P 2 O 7 ) 2 ] 1D chain structure constructed from corner-sharing linkage of novel AlP 4 O 16 9− anion groups, and the AlP 4 O 16 9− group is formed by edge-sharing connection of two P 2 O 7 dimers and one AlO 6 octahedron . However, NaBaAl(PO 4 ) 2 exhibits a new [Al(PO 4 ) 2 ] 2D layer structure composed of AlP 2 O 10 7− anion groups via corner-sharing, and the AlP 2 O 10 7− group is generated by alternate linkages of corner-sharing PO 4 and AlO 4 tetrahedra. Analysis based on Pauling's electrostatic rule and Brown's bond valence model finds that structural feature of the two anion groups is mainly responsible for their different dimension structures in addition to structure-directed role of large Ba 2+ . The two crystals manifest a deep-UV optical transparency below 190 nm and good thermal stability, making them a potential optical window material. First-principles calculations reveal that the optical bandgaps of both crystals are determined by the Ba–O groups, rather than Al–O and P–O common groups.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 31
·14082-14090
·
IF 3.591
Huazi Wang,Qinqin Xu,Jinglong Jiao,Hai Wu
A solidified floating organic drop-dispersive liquid–liquid microextraction (SFOD-DLLME) was established for the extraction of four benzophenone-ultraviolet filters (BP-UV filters) from water samples using a fatty acid deep eutectic solvent (DES) as the extractant. The extracted UV filters were determined by high-performance liquid chromatography with UV detection (HPLC-UVD). In this method, tributyl(dodecyl)phosphonium bromide (P4,4,4,12Br) and sodium decanoate (DecA-Na) were first dissolved in a solution as precursors of DES components. Then they were converted into tributyl(dodecyl)phosphonium tetrafluoroborate (P4,4,4,12BF4) and decanoic acid (DecA) through an anion-exchange reaction and acid–base reaction, respectively. During this period, P4,4,4,12BF4 and DecA formed a DES extraction phase dispersed throughout the solution and the extraction of the analytes was carried out simultaneously. The extraction conditions, including the type and volume of fatty acids, the type and volume of the proton agent, the temperature of the P4,4,4,12Br and NaBF4, solution, salt addition, sample volume and solution pH, were investigated in detail. Under optimal conditions, the method was validated providing correlation coefficients greater than 0.999 for all analytes, limits of detection (LODs) from 0.600 to 1.50 μg L−1, limits of quantification (LOQs) from 2.00 to 5.00 μg L−1, extraction recoveries of 73.1 to 99.8%, intra-day precision from 2.0 to 6.1%, inter-day precision from 3.9 to 7.7%, and enrichment factors from 34 to 42. Finally, the proposed method was applied for the determination of BP-UV filters in different water samples (including tap, river, bottled mineral, bottled vitamin, face-washing and bathing water) with acceptable results.
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MOLECULES
·
2023
·Vol. 28
·期 14
·5309
·
IF 4.6
Shi-Hui Lu,Xiao-Na Liang,Xiao-Jin Nong,Ran Chen,Xiu-Xia Li
Trans-p-hydroxycinnamic acid and its esters in the leaves ofLigustrum robustummight be a new resource to prevent diabetes and its complications. In the present study, a new HPLC-UV method using hydrolyzation with sodium hydroxide for quantitation oftrans-p-hydroxycinnamic acid and totaltrans-p-hydroxycinnamic acid esters in the leaves ofL. robustumwas developed, since it was difficult and troublesome to analyze no less than 34trans-p-hydroxycinnamic acid esters by usual HPLC. The extract ofL. robustumwas hydrolyzed with sodium hydroxide at 80 °C for 2 h, and then, hydrochloride was added. HPLC analysis was performed in reverse phase mode using a C-18 column, eluting with methanol-0.1% acetic acid aqueous solution (40:60,v/v) in isocratic mode at a flow rate of 1.0 mL·min−1and detecting at 310 nm. The linear range fortrans-p-hydroxycinnamic acid was 11.0–352.0 μg·mL−1(r2= 1.000). The limit of detection and limit of quantification were 2.00 and 6.07 μg·mL−1, respectively. The relative standard deviations of intra-day and inter-day variabilities fortrans-p-hydroxycinnamic acid were less than 2%. The percentage recovery oftrans-p-hydroxycinnamic acid was 103.3% ± 1.1%. It is the first HPLC method using hydrolyzation for quantification of many carboxylic esters. Finally, the method was used successfully to determinetrans-p-hydroxycinnamic acid and totaltrans-p-hydroxycinnamic acid esters in various extracts of the leaves ofL. robustum. The 60–70% ethanol extracts ofL. robustumshowed the highest contents of freetrans-p-hydroxycinnamic acid (3.96–3.99 mg·g−1), and the 50–80% ethanol extracts ofL. robustumdisplayed the highest contents of totaltrans-p-hydroxycinnamic acid esters (202.6–210.6 mg·g−1). The method can be applied also to the quality control of the products ofL. robustum.Keywords:trans-p-hydroxycinnamic acid;esters;Ligustrum robustum;HPLC-UV;hydrolyzation;sodium hydroxide;quantification
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Lei Wang,Hong Wang,Sinong Huang,Jiao Feng,Yifei Wu,Jing Deng,Junping Liu,Xiang Tu,Xiaoyan Ma,Xueyan Li,Andrea M. Dietrich
Complete dehalogenation of halogenated organic pollutants has attracted increasing attention, and electrocatalytic reduction processes are considered prospective technologies due to their high selectivity for carbon-halogen bonds. In this study, a vitamin B 12 (VB 12 ) composite electrode was prepared and applied to remove the refractory tribromoacetic acid (TBAA). The reduction process dominated by the VB 12 composite electrode showed a degradation efficiency of 55.2 % for 200 μg/L TBAA within 60 min. Interestingly, UV irradiation considerably increased the efficiency of TBAA for dehalogenation on the VB 12 composite electrode. The photoelectrochemical co-catalytic system of a VB 12 composite electrode coupled with UV (LP UV 254 nm) could remove 92.2 % of TBAA in 20 min with a rate constant 12 times higher than the VB 12 -only electrolysis system. The in situ Raman characterization and cyclic voltammetry tests confirmed that the accelerated formation of Co-Br bonds and the enhanced atomic H* mediated ability were responsible for improving debromination efficiency. The degradation of TBAA mainly underwent chemical reactions of debromination and mineralization. Acetic acid, formic acid, formaldehyde, and Br - were the major transformation products of TBAA. Acidic conditions favoured TBAA removal in the UV synergistic VB 12 electrolytic system, and excellent cycling stability of debromination was obtained in complex aqueous environments (actual bodies of water containing various inorganic and organic matter). This research provides an efficient dehalogenation technology for halogenated micropollutants and novel perspectives on the scientific design of photoelectrochemical dehalogenation processes.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Changwu Zheng,Meng Ju,Xufang Zhang,Kongliang Xie,Aiqin Hou,Aiqin Gao
The fabrication and development of assemblies of bionic smart skin with multi-stimulus response and multi-color tunable properties is a major challenge in the field of advanced materials and smart wearable devices. In this work, an amphiphilic functional nanogel switch connected by long polyether chain segments containing bis-spiropyran with the π-π stacking interactions was designed. A multi-stimulus responsive color-changing nanogel actuator (SP-PEG-NA) was constructed using ionic liquid-assisted self-assembly. A composite bionic smart skin (WPU/SP-PEG@CF) was prepared by compositing SP-PEG-NA, waterborne polyurethane (WPU) and flexible cotton fabric based on physical cross-linking. The smart skin possesses multiple color-changing properties in response to light, heat and humidity. Even under ultra-low UV intensity (0.025 mW/cm 2 ), WPU/SP-PEG@CF also exhibits significant photochromic properties. Surprising, the smart composite constructed with the nanogels possessed extremely high UV shielding performance (UPF 628.68) and photocontrolled hydrophobic-hydrophilic transition properties. The self-assembled nanogel actuators greatly improved the stimulus–response sensitivity. The multiple supramolecular noncovalent interactions of the nanogel actuator such as hydrophilic long polyether structures hydrogen-bonding and π-π stacking interactions endowed nanogel highly self-assembly properties. They showed excellent multi-stimulus response in color-changing, versatility and reversibility. The multi-stimulus responsive and multifunctional smart composites prepared using self-assembled nanogel has potential applications in smart wearable materials, sensors and information display.
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危险品化学品经营许可证（带存储）