FOOD RESEARCH INTERNATIONAL
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2021
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IF 6.475
Xin-Yun Wang,Jing Xie,Xin-Jun Chen
This study aimed to investigate the lipid oxidation and distribution in Bigeye tuna stored at 0 °C and 4 °C for 6 days. Tuna were evaluated by determining the peroxide value (POV), acid value (AV), anisidine value (AnV), polyene index, fluorescence ratio (FR), phosphatidylcholine (PC), phosphatidylethanolamine (PE), phosphatidylinositol (PI) content, and major glycerophospholipid molecular species. The value of lipid oxidation indexes (POV, AV, AnV, FR, PC, PE and PI) increased as the storage time increased. High-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) results indicated that the major types of lipids included diacylglycerol (DAG), monoacylglycerol (MAG), phospholipid (PL), and triacylglycerol (TAG). At least 136 PC and 64 PE molecular species were identified in Bigeye tuna. The results of the confocal laser scanning microscope analysis indicated the distribution of TAG and PL particles. In addition, principal component analysis showed that the contents of PI and TAG were positively correlated with PC, polyene index and lipid content but negatively correlated with PI, POV, FR, AOV, AnV, MAG, and DAG, which might be explained by distinguishing the lipid parameters affecting lipid oxidation. Therefore, this study may provide a novel method to evaluate lipid changes and contribute to the balanced nutritional value of aquatic foods during cold storage.
研究领域:
食品科学
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生物化学
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CERAMICS INTERNATIONAL
·
2022
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IF 5.532
Guanjie Zeng,Xiaozhong Huang,Jiyang Li,Jianling Yue,He Zhang,Xiu-Zhi Tang
Creating multifunctional materials that can serve in extreme environments is of critical importance but also a formidable challenge. Herein, we present a simple technique that combines carbothermic reduction and organic template carbonization to produce multifunctional SiC/C hybrid fabrics from inexpensive cotton mats. The obtained fabrics display high resilience to high/low temperature, anti-oxidation, and chemical assault is exhibited. Additionally, the fabric's ultralow thermal conductivity results in superior thermal insulation performance. Notably, these in situ-generated SiC nanowires considerably improve the ductility of the ceramic fabric. The compression strength and the breaking elongation increased by 39% and 2.6%, respectively, as compared to the SiC fabric without grown nanowires. When employed as an electromagnetic interference shielding material, it exhibits an excellent EMI shielding capability with a SE value of 40 dB. This research advances not just the usability of flexible ceramic fabrics in severe environments, but also the creation of fine structures in ceramic materials.
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Materials Today Chemistry
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2023
·
IF 7.3
Baotian Qiu,Xiudi Xiao,Gang Xu,Guoping Dong
Self-powered electrochromic devices (defined as SECDs) driven by metal electrodes have attracted wide attention due to their low voltage, low energy consumption characteristics, and getting rid of the limitation of external power supplies. However, the applicability in extreme temperature environments is severely hampered by the inadequate choice of electrochromic electrolytes. Herein, we adopt the ethylene glycol-assisted salty PVA-type hydrogel electrolyte with a minimum freezing point as low as −50 °C. Based on the hybrid Zn 2+ and Al 3+ , the ion conductivity of hydrogel electrolyte at room temperature is 1.56 mS cm −1 , and the fracture strain can exceed 300%. The hydrogel electrolyte can maintain average transmittance of 95% within a wide temperature range of −40 °C–60 °C. After freezing at −30 °C, the breaking elongation can reach 352%, and the tensile strength is up to 4.45 MPa. Based on the W 18 O 49 films and the hydrogel electrolyte, the modulation of the SECDs can reach 63%, and the cycle life is more than 1000 times. After building the flexible device, the modulation of the flexible SECDs based on the PEN/ITO substrate is 51% at 25 °C and 43% at −40 °C. What's more, the flexible SECDs can be tailored and worked normally without packaging, which can promote the development of the cryogenic and tailorable application of the flexible SECDs.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
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IF 19.503
Rui Li,Qixuan Lin,Yingxiong Wang,Weiran Yang,Xinxin Liu,Weiying Li,Xiaohui Wang,Xiaoying Wang,Chuanfu Liu,Junli Ren
The efficient production of xylose and arabinose from glucose, is significant but technologically challenging. Herein, the conversion of glucose to pentose (xylose and arabinose) and formic acid was realized using non-toxic artificial zeolite and green solvent of γ-butyrolactone-H 2 O. The selective conversion of glucose to 5-hydroxymethylfurfural, pentose and furfural could be regulated by controlling Brønsted acid strength. The weak Brønsted acid could promote the formation of pentose, while strong Brønsted acid could lead to the formation of HMF and further degradation of pentose to furfural. The mechanism was investigated spectroscopically to add fundamental insights to the selective C1-C2 bond cleavage. The solvent of γ-butyrolactone-H 2 O reduced apparent activation energy by promoting the formation of active d -fructofuranose. The favorable yield reached to 54.3 % pentose and 54.7 % formic acid from glucose, while 95.6 % pentose and 96.8 % formic acid from fructose at 453 K for 1.5 h. This strategy offered a new utilization way of glucose in expanding the varieties of platform chemicals.
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ANALYTICA CHIMICA ACTA
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2020
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IF 5.977
Xiaoping Zhang,Xiang Ren,Konstantin Chingin,Jiaquan Xu,Xin Yan,Huanwen Chen
We present an approach for the elucidation of C=C bond position and cis/trans isomers, which is achieved by the reaction of ambient water radical cations and double bonds, followed by the fragmentation of epoxide radical cations to generate diagnostic ions in tandem mass spectrometry . Hexenol double bond positional isomers and cis/trans isomers which exhibit different properties and biological functions are characterized as a proof of concept. The merits of the approach include the simplicity of experimental setup, rapid derivatization (within seconds), the obviation of organic solvents , as well as easy spectral interpretation.
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GREEN CHEMISTRY
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2020
·Vol. 22
·期 8
·2468-2473
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IF 9.48
Taimei Cai,Qiang Deng,Hailong Peng,Jin Zhong,Rui Gao,Jun Wang,Zheling Zeng,Ji-Jun Zou,Shuguang Deng
The major challenge in the synthesis of high-density biofuels is to identify the bio-based source for C–C cyclic compounds and C–C coupling reactions with a suitable selectivity. Herein, we selectively synthesize 1,2,4-benzenetriol (BTO) with a yield of 51.4% from cellulose-derived 5-hydromethylfurfural via a ring-rearrangement reaction. The cellulose-derived route is a more meaningful route for the C–C cyclic compounds compared to the traditional hemicellulose- and lignin-derived routes. Furthermore, BTO is very easily dimerized via a C–C oxidative coupling reaction, showing a yield of 94.4% and selectivity of nearly 100% under environmentally friendly reaction conditions. After hydrodeoxygenation, bicyclohexane is obtained with a yield of 87.4%. This work not only provides a promising route to produce C–C cyclic fine compounds based on a cellulose-derived route, but also shows a highly efficient synthesis route for high-density biofuels via the C–C oxidative coupling reaction.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2021
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IF 5.302
Fuhai Liu,Maozhong Yi,Liping Ran,Yicheng Ge,Zhe Zhou,Ke Peng
C/C-BN-SiC composite was prepared by ceramic slurry infiltration combined with resin impregnation and carbonization, and the matrix with continuous distributed self-healing phase was obtained. In this study, the kinetic characteristics and oxidation behavior of the composites with various h-BN/SiC ratios in the temperature range of 600∼1300°C were studied by combining the isothermal oxidation test with the kinetic model. The optimal h-BN/SiC ratio balances the thermal stability and fluidity of the oxidized product, which not only has high thermal stability and low oxygen permeability to acts as an oxygen diffusion barrier but also has a certain fluidity to seal defects.
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RSC Advances
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2016
·Vol. 6
·期 38
·32202-32211
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IF 3.289
Changyan Wu,Xinwen Peng,Linxin Zhong,Xuehui Li,Runcang Sun
Catalytic process is the key process for many chemical industries. In this study, a novel heterogeneous Pd (CMH–Pd(0)) has been prepared by the deposition of palladium nanoparticles (Pd NPs) onto the surface of carboxymethyl functionalized hemicelluloses using ethanol as solvent and in situ reducing agent. The as prepared catalyst was characterized by TEM, HR-TEM, XRD, FT-IR, TGA and XPS. The loading level of Pd in the CMH–Pd(0) catalyst was 0.38 mmol g−1. The catalyst showed high catalytic activity and versatility towards Heck coupling reactions under aerobic conditions and could be readily recovered and reused in at least five successive cycles without obvious loss in activity. The catalyst is promising for its renewability, environmental benefits, efficient catalytic activity, mild reaction conditions, simple product work-up and easy catalyst recovery.
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JOURNAL OF THE ENERGY INSTITUTE
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2016
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IF 1
Nan Li,Wei-Yan Xia,Chang-Wei Xu,Shuang Chen
This study investigated Pt/C and Pd/C catalysts promoted by Au for glycerol electrooxidation in alkaline medium . The results show that addition of Au can significantly promote the catalytic activity and stability of Pt/C and Pd/C for glycerol electrooxidation. The catalysts with a weight ratio of 4:1 for Pt to Au and Pd to Au show the best performance for glycerol electrooxidation and the PtAu(wt 4:1)/C shows a better performance than the PdAu(wt 4:1)/C. Glycerol electrooxidation on the PdAu(wt 4:1)/C has a better stability than that on the Pt/C. The results show that the PdAu(wt 4:1)/C can give a better discharge performance than the Pt/C in a direct glycerol fuel cell. Electrooxidation of pre-adsorbed CO has been used to explain the results.
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Catalysts
·
2025
·Vol. 15
·期 3
·199
·
IF 4
Aiming Huang,Jiayue Yu,Junjun Zhang,Yifan Zhang,Yang Wu,Yong Wang,Wen Luo
The electroreduction of CO2(CO2RR) is a promising and environmentally sustainable approach to closing the carbon cycle. However, achieving high activity and selectivity for multicarbon (C2₊) products remains a significant challenge due to the complexity of reaction pathways. In this study, porous carbon-supported copper catalysts (CuHCS) with pore sizes of 120 nm (CuHCS120) and 500 nm (CuHCS500) were synthesized to tailor the microenvironment at the electrode–electrolyte interface and enhance product selectivity. CuHCS120 achieved a maximum faradaic efficiency (FE) for C2₊ products of 46%, double that of CuHCS500 (23%). In contrast, CuHCS500 showed a higher FE for CO (36%) compared to CuHCS120 (14%) at the same potential. In-depth ex situ and in situ investigations revealed that smaller pores promote the enrichment and adsorption of *CO intermediates, thereby enhancing C–C coupling and the formation of C2₊ products. These findings underscore the critical role of structural confinement in modulating the catalytic microenvironment and provide valuable insights for the rational design of advanced catalysts for CO2RR.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Junjie Xu,Wei Sun,Xiang Xiong,Hongbo Zhang,Lingkun Yang
Spacecraft thermal protection materials need to survive long-term exposure to oxygen-containing environments at 2400 °C. In this study, a high-density and low-porosity metal-ceramic-modified composite was prepared at a low temperature (1500 °C) in the presence of W and Cu using combined slurry brushing and reactive melt infiltration methods. An investigation of the composite formation mechanism and the effects of W and Cu indicated that W and ZrB 2 were formed via dissolution-precipitation and the external diffusion of C and B, respectively. The low reaction temperature and the metallic phases significantly improved the mechanical properties, thermophysical properties, and long-term ablation behaviours of C/C–ZrC–ZrB 2 –W–Cu. Compared to traditional C/C–ZrC, the flexural strength and fracture toughness of the composite increased by 71.56 % and 90.05 % to 345.95 MPa and 14.52 MPa m 1/2 , respectively, and the thermal conductivity increased by 174.93 % to 59.11 W/m·K. In addition, W and Cu effectively lowered the surface temperature by nearly 250 °C during 300 s ablation, and the mass and line ablation rates decreased to −0.272 mg/s and −0.247 μm/s, respectively.
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RARE METALS
·
2025
·
IF 11
Dong Yu-Guo,Kong Wen-Jing,Ma Zhuang,Yang Yong,Wang Ping,Sheng Shi-Xiong,Dong Lin,Gu Xiao-Li,Chen Zu-Peng
The oxidation of lignin model compounds to esters via C–C bond cleavage has attracted considerable attention, as esters could be used as important polymer precursors and pharmaceutical intermediates. However, most studies focus on designing homogeneous or noble metal catalysts and conducting the reactions under basic conditions. Here, we report an efficient process for the C–C bond cleavage of lignin model compounds and selectively producing esters over different shaped CeO 2 (i.e., nanospheres (S), nanorods (R), nanoparticles (P), and nanocubes (C)) under base-free conditions. Specifically, the yield of methyl anisate from the aerobic oxidation of 1-(4-methoxyphenyl)ethanol reaches 77.6% over CeO 2 -S in one hour (91% in 9 h), exhibiting higher performance compared to other evaluated CeO 2 catalysts (6.4%–40.2%). Extensive characterizations and experimental investigations reveal that the density of weak base sites and oxygen vacancies on the CeO 2 surface is positively correlated with the yield of methyl esters. Furthermore, the reaction pathway is investigated, which confirms that 1-(4-methoxyphenyl)ethanol first undergoes two reactions (i.e., etherification and dehydrogenation) to produce intermediates of 1-methoxy-4-(1-methoxy-ethyl)-benzene and 1-(4-methoxyphenyl)ethanone, respectively, followed by a series of functional group transformations to generate the targeted methyl anisate ultimately. Graphical abstract
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危险品化学品经营许可证（带存储）