ACS Applied Materials & Interfaces
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2022
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IF 10.383
Qiang Liu,Wei Huang,Bo Liu,Pu-cheng Wang,Hong-bing Chen
Gamma radiolysis behaviors and mechanisms of silica-filled o-cresol formaldehyde epoxy are studied at 2.20 × 10–5 to 1.95 × 10–1 Gy/s. The radiolysis-induced changes in chemical structures do not severely affect its thermostability. The slightly deteriorated mechanical strength at temperature exceeding 100 °C is accompanied by the declining glass transition temperature (from 185.9 to 172.2 °C) and enhanced damping ability. The gas yields of hydrogen, methane, and carbon dioxide manifest a remarkable dose rate effect. Based on the Schwarzschild law, their yields at an extremely low dose rate are accurately predicted by the established master curves. Besides, the latent radiolysis of gas products and postradiation effect are found with caution. The radiation-caused residual spin species are proved to be composed of silica defects and a phenoxy-type free radical with a tert-butyl group, according to the experimental results, theoretical calculations, and spectra simulations. The lower vertical ionization potential (7.6 eV) and adiabatic ionization potential (7.1 eV) are primarily due to the ionization of the benzene ring moiety with the tert-butyl group, which is likely to suffer from radiolysis. The calculated bond dissociation energy (260.8–563.5 kJ/mol) of the typical chemical bonds of epoxy is consistent with its radiolytic vulnerability and degradation mechanisms.
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CARBOHYDRATE POLYMERS
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2022
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IF 10.723
Ruoning Zhang,JingjingYu,Nan Liu,Yanxiang Gao,Like Mao
This study reported a novel approach to stabilize W/O emulsions with nanoparticles and oleogel from ethylcellulose (EC), and the emulsions were applied for multiple delivery. Microstructural observations revealed that EC nanoparticles were distributed within the water droplets and at the interface, and EC oleogel was in the continuous phase. Storage modulus and viscosity were higher, and thixotropic structural recovery rates were lower, in the emulsions with more EC nanoparticles. Both EC nanoparticles and oleogels worked to stabilized the emulsions upon freeze-thawing, as only minor water or oil was released. Upon heating, some EC nanoparticles transited from the interface to the oil phase, and water droplets were aggregated. The interface was recreated when the samples were re-emulsified. When curcumin and anthocyanin were incorporated, both bioactives had improved light stability. During in vitro study , curcumin was mostly released at the early stage of intestinal digestion, while anthocyanin was released at later stage.
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Journal of Materials Chemistry A
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2022
·Vol. 10
·期 10
·5430-5441
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IF 14.511
Huaijie Shi,Ge Feng,Suiqin Li,Jia Liu,Xinying Yang,Ye Li,Ye Lu,Xing Zhong,Shibin Wang,Jianguo Wang
An alternative method for producing ozone, electrochemical ozone production (EOP) is a major area of interest in the field of in situ sterilization and disinfection. However, commercial lead dioxide as a traditional anodic electrocatalyst is highly toxic and has low durability, and exploring anodic electrocatalysts with lower lead content and performance loss is challenging. Herein, a series of pyramidal sillenite-type Bi12PbO20 materials were designed and fabricated with a hydrothermal method in which Pb was introduced to Bi2O3 frameworks. The product, Bi12PbO20-3, exhibited remarkable EOP performance, with faradaic efficiency of 15.1% at 50 mA cm−2 in a neutral solution, which was almost 1.5 times that of commercial β-PbO2. Computational simulations further demonstrated that the confined [Pb–O4] fragment was confined in the Bi–O bonding environment of Bi12PbO20, the low oxygen vacancy formation energy resulted from the weak Pb–O interaction and remarkably enhanced EOP activity. Such a local confined environment plays a vital role in suppressing Pb loss, thereby accounting for the robust EOP stability. Additionally, the significant performance of the membrane electrode assembly system in the electrochemical degradation of antibiotics and pesticides implied the potential environmental application capabilities of Bi12PbO20.
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FOOD CONTROL
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2022
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IF 6.652
Yanqin Yang,Jialing Xie,Jiayu Chen,Yuliang Deng,Shuai Shen,Jinjie Hua,Jinjin Wang,Jiayi Zhu,Haibo Yuan,Yongwen Jiang
N,O-Heterocycles play an important role in the characteristic flavor of green tea owing to their strong odors and low odor thresholds. In this study, a rapid and sensitive method was developed to determine seven N,O -heterocycles in green tea by using headspace solid-phase microextraction Arrow (HS-SPME-Arrow) coupled with gas chromatography-triple quadrupole-tandem mass spectrometry. The HS-SPME-Arrow extraction was performed using a Carbon WR SPME Arrow fiber. Good linear ranges (5–1000 ng/mL) were obtained, with correlation coefficients (R 2 ) higher than 0.99 for all target compounds. LODs and LOQs were in the range of 0.44–5.12 and 1.48–17.04 μg/kg, respectively. The recoveries of seven N,O -heterocycles were found to vary from 83.1% to 117.3%, with RSDs being lower than 10%. The dynamic changes of N,O -heterocycles during the drying process revealed that 25- and 40-min-long drying processes were key transition points. Furfural could be used as a key indicator compound for evaluating the extent of the drying. Moreover, furfural and 2-methylfuran revealed a significant positive correlation with proline ( p < 0.05). The possible formation mechanisms of N,O -heterocycles were further elaborated by simulated Maillard reactions . Our results provide a theoretical foundation for the improvement and directional regulation of aroma quality of green tea during manufacturing.
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Frontiers in Aging Neuroscience
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2022
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IF 5.702
Wang Wang,Guoxue Zhu,Yuwen Wang,Wei Li,Shilin Yi,Kai Wang,Lu Fan,Juanjuan Tang,Ruini Chen
Background Parkinson’s disease (PD) is a multifactorial degenerative disease of the central nervous system, which affects mostly older adults. To date, research has focused on the progression of PD. Simultaneously, it was confirmed that the imbalances in gut microbiota are associated with the onset and progression of PD. Accurate diagnosis and precise treatment of PD are currently deficient due to the absence of effective biomarkers. Methods In this study, the pharmacodynamic study of cyanidin-3- O -glucoside in PD mice was used. It intends to use the “imbalance” and “balance” of intestinal microecology as the starting point to investigate the “gut-to-brain” hypothesis using metabolomic-combined 16S rRNA gene sequencing methods. Simultaneously, metabolomic analysis was implemented to acquire differential metabolites, and microbiome analysis was performed to analyze the composition and filter the remarkably altered gut microbiota at the phylum/genera level. Afterward, metabolic pathway and functional prediction analysis of the screened differential metabolites and gut microbiota were applied using the MetaboAnalyst database. In addition, Pearson’s correlation analysis was used for the differential metabolites and gut microbiota. We found that cyanidin-3- O -glucoside could protect 1-methyl-4-phenyl-1,2,3,6− tetrahydropy ridine (MPTP)-induced PD mice. Results Metabolomic analysis showed that MPTP-induced dysbiosis of the gut microbiota significantly altered sixty-seven metabolites. The present studies have also shown that MPTP-induced PD is related to lipid metabolism, amino acid metabolism, and so on. The 16S rRNA sequencing analysis indicated that 5 phyla and 22 genera were significantly altered. Furthermore, the differential gut microbiota was interrelated with amino acid metabolism, and so on. The metabolites and gut microbiota network diagram revealed significant correlations between 11 genera and 8 differential metabolites. Conclusion In combination, this study offers potential molecular biomarkers that should be validated for future translation into clinical applications for more accurately diagnosing PD. Simultaneously, the results of this study lay a basis for further study of the association between host metabolisms, gut microbiota, and PD.
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ANALYTICAL SCIENCES
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2022
·Vol. 38
·期 2
·323-330
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IF 1.967
Yue Jinping,Wang Wan,Lv Qing,Wang Zhijuan,Liu Yahui,Zhang Qing
A bicomponent colorimetric probe based on carbon quantum dots (CQDs) and o -phenylenediamine (OPD) was established for the detection of Cu 2+ . Theoretically, light-generated electrons from CQDs were trapped by the dissolved oxygen, resulting in the production of superoxide radicals. The colorless OPD was oxidized by the superoxide radicals to its yellow oxidation product (OPD ox ). On the other hand, Cu 2+ can bind onto the surface of CQDs and change the band gap of the CQDs. This change induces an inhibition of the photo-oxidation of OPD, thus resulting in a decrease of the absorbance of OPD ox . The mechanism was demonstrated by a series of control experiments. The parameters influencing the sensing performance as well as potential interferences were investigated. Under the optimum conditions, a limit of detection of 30 nM was achieved. Moreover, this sensing system was applied to analyze Cu 2+ in seawater and tapwater samples, and achieved satisfying results. Graphical abstract
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Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Wujian Zhang,Yue Meng,Yuhua Liu,Hui Shen,Zheming Ni,Shengjie Xia,Wenfeng Han,Ying Li,Haodong Tang
In this work, LaOCl/LDH Z-scheme heterojunction catalyst containing oxygen vacancies were successfully constructed and used for photodegradation of norfloxacin (NOR). The results showed that the removal rate of NOR by LaOCl/LDH was up to 90%, and the reaction rate constant was 2 times than LaOCl and LDH. By exploring factors affecting the photodegradation performance, including pH, catalyst dosage, light intensity and reaction time, the kinetics of the degradation process were investigated in detail. It indicates that the formation of Z-scheme heterojunction enhanced the separation and transfer of photogenerated carriers and enhanced the redox capacity of photocarriers. DFT calculation shows that the oxygen vacancies on LaOCl promoted the absorption of visible light and effectively adsorbing and activating small molecules. In addition, based on LC-MS results, intermediates and a possible pathway for NOR degradation were proposed. The synergistic effect of Z-scheme heterojunction and oxygen vacancies enhanced the photodegradation property of LaOCl/LDH for NOR, which provides a reference for constructing highly efficient photocatalysts.
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Membranes
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2022
·Vol. 12
·期 4
·377
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IF 4.562
Zhengzhong Zhou,Bin Zhang,Qian Wang,Xiaoshan Meng,Qigang Wu,Tao Zheng,Taoli Huhe
Multi-stage A/O-MBR processes were designed to improve wastewater treatment efficiency; three different designs were carried out and compared in this study. The 2(A/O)-MBR process, i.e., with two sets of anoxic/oxic tanks in series, showed better effluent quality than A/O-MBR and 3(A/O)-MBR processes. The removal rates of COD, NH4+-N, TP and TN were 95.29%, 89.47%, 83.55% and 78.58%, respectively, complying satisfactorily with China’s urban sewage treatment plant pollutant discharge standards. In terms of membrane fouling, the 3(A/O)-MBR process demonstrated the lowest fouling propensity. The microbial community structure in each bioreaction tank was analyzed, the results from which matched with the process efficiency and fouling behavior.Keywords:membrane bioreactor;wastewater treatment;microbial community;membrane fouling;multi-stage A/O
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FOOD RESEARCH INTERNATIONAL
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2022
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IF 7.425
Dingyang Lv,Lifen Zhang,Fusheng Chen,Lijun Yin,Tingwei Zhu,Yilin Jie
Wheat bran arabinoxylan-bovine serum albumin (WBAX-BSA) conjugates were prepared via enzymatic synthesis using horseradish peroxidase (HRP) and H 2 O 2 as catalysts. The conjugates were characterized by ultraviolet–visible spectroscopy (UV–vis), high-performance size exclusion chromatography (HPSEC), scanning electron microscopy (SEM), and transmission electron microscope (TEM). The feasibility of its application in stable emulsions was also assessed. UV–vis results revealed that phenolic acid in WBAX and aromatic amino acids in BSA were implicated in the enzymatic synthesis of the WBAX-BSA conjugate with the optimal WBAX:BSA mass ratio of 3:2. HPSEC results confirmed the intermolecular interactions between WBAX and BSA and the molecular weight of WBAX-BSA (2673 ± 16 kg/mol) was higher than that of control groups. Compared with the WBAX/BSA physical complexes, the WBAX-BSA conjugates had higher apparent viscosity (0.08–0.24 Pa.s), denser structure, larger particle sizes (33.5 ± 5.7 nm), and improving emulsifying properties in oil in water (O/W) emulsion system under different environmental stresses. The preparation of the enzymatic conjugates not only provides novel O/W emulsion systems but also improves processed food manufacturing processes that require efficient emulsification.
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Sustainable Energy & Fuels
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2022
·Vol. 6
·期 13
·3208-3219
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IF 6.813
Wei Hui,Xin-Yi Xu,Fei-Feng Mao,Ling Shi,Hai-Jun Wang
Porous carbon materials have shown great promise for the efficient capture and conversion of atmospheric CO2, but remain challenging. In this work, activated N/O-rich multilayer ultramicroporous carbon materials for the effective capture and conversion of atmospheric CO2 have been generated using a simple one-step method. Notably, the developed catalyst has a multilayered ultramicroporous framework and double N/O heteroatoms as active sites, which capture and activate atmospheric CO2 for the cycloaddition reaction simultaneously, obtaining 96% yield of cyclic carbonate. Additionally, the stable recyclability of the catalyst highlights the sustainability of the efficient conversion of CO2 to cyclic carbonates under mild conditions. Meanwhile, the low isosteric heat of CO2 adsorption is measured to be around 14.8–19.1 kJ mol−1, which means that the energy consumption of the CO2 desorption process would be quite low in industrial application. We believe that this work has tremendous potential for industrial CO2 capture and conversion into high-value-added products.
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Food Packaging and Shelf Life
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2022
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IF 8.749
Bing Yang,Shengnan Yin,Xiaofang Bian,Changlin Liu,Xinhong Liu,Yongli Yan,Chunxia Zhang,Hui Zhang,Zhaosheng Hou
The main target of the current exploration is to represent a novel type of edible biomaterial composed of monomethoxyl polyethylene glycol-modified O-carboxymethyl chitosan (MPEG-O-CMC) for fresh-keeping food packaging materials. MPEG-O-CMCs were prepared by a facile method that consists of three steps: the C 6 -hydroxyl group of chitin (CH) was first substituted by chloroacetic acid ; O-carboxymethyl chitosan (O-CMC) was subsequently obtained via a deacetylation reaction; and finally, the NH 2 groups of O-CMC were reacted with isocyanate-terminated methoxypolyethylene glycol (MPEG-NCO) to yield MPEG-O-CMC. The chemical structures of O-CMC, MPEG-NCO, and MPEG-O-CMC were scrutinized through nuclear magnetic resonance spectroscopy (NMR) and Fourier transform–infrared spectroscopy (FT-IR), and the influences of the MPEG content on the physicochemical features of the solution-cast MPEG-O-CMC films was extensively researched. The results showed that the introduction of polyethylene glycol (PEG) could ameliorate the hydrophilicity, thermal stability, flexibility, and tensile features of the film. When the grafting degree of MPEG was approximately 25% (the MPEG content in MPEG-O-CMC was 18.5 wt %), the film possessed a lower T g of −30 °C and higher tensile features (strain at break: 221%; ultimate stress: 4.4 MPa). The water vapor transmission rates (WVTR) of the MPEG-O-CMC films was evaluated by osmosis tests at different humidity, and the results showed that films possessed good WVTR of 25–200 g·mm/(m 2 ∙24 h) at 50% humidity. The WVTR decreased gradually with the increase of MPEG content in the material, which was mainly attributed to the flexible MPEG segments acting as a plasticizer and reducing the dimension of the transient interspaces. Furthermore, the preliminary evaluation of bacteriostatic activity indicated that the films possess a certain bacteriostatic activity against Escherichia coli . Due to its good tensile properties , acceptable WVTR and potential bacteriostatic activity, this nontoxic and even edible biomaterials hold significant promise for application in fresh-keeping food packing materials.
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RENEWABLE ENERGY
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2022
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IF 8.634
Wenjing Song,Mengxue Song,Wenqing Cai,Weichu Li,Xingmao Jiang,Weiping Fang,Weikun Lai
Development of highly active and stable catalyst for C–O bonds cracking is important in biomass conversion , in this work, we report a SiO 2 -encapsulated NiPt/HY core-shell catalyst for phenethoxybenzene (PEB) catalytic cracking . The as-grown silica shell with defined pores serves as a ‘storage’ to enhance local concentration of PEB and intermediate isomers and promotes catalytic cracking on NiPt/HY core. With the increase of silica shell thickness from 0 to 40 nm, PEB reaction rate has increased more than five times, and the major cracking product selectivity is raised to above 90%, which is attributed to the continuous conversion of PEB isomers within the shell. This designed structure endows the NiPt/HY@SiO 2 with a high activity and no obvious deactivation in PEB cracking to corresponding phenol and aromatics. The outstanding performance benefit from the enrichment effect on the unique core-shell structure, as well as the moderate acidity originated from silica regulation. This work can be extended to the modulation of microenvironment to promote the catalytic behavior of core-shell catalysts.
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