LWT-FOOD SCIENCE AND TECHNOLOGY
·
2019
·
IF 3.714
Xiaosan Wang,Cong Jiang,Wendi Xu,Zhicheng Miu,Qingzhe Jin,Xingguo Wang
Structured triacylglycerols (TAGs), rich in 1,3-dioleoyl-2-palmitoylglycerol (OPO) and 1-oleoyl-2-palmitoyl-3-linoleoylglycerol (OPL), were prepared by enzymatic acidolysis of fractionated palm stearin with free fatty acids . The effects of enzyme type, substrate molar ratio, enzyme load, temperature, and reaction time on the yields of OPO and OPL, palmitic acid (PA) content at the sn- 2 position of TAG, and the percentage of PA at the sn- 2 position relative to total PA content were investigated. Under optimal reaction conditions (palm stearin/oleic acid/linoleic acid molar ratio of 1:8:4, lipase NS 40086 loading of 8%, 60 °C, 4 h), the combined yields of OPO and OPL was 69.26%, PA content at the sn- 2 position reached 87.75%, and the relative percentage of PA at the sn- 2 position was up to 71.07%. The synthesized TAGs have potential to be used in infant formulas.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2021
·Vol. 8
·期 18
·2100528
·
IF 6.147
Fandong Meng,Quan Liu,Zhekun Shi,Di Tan,Baisong Yang,Xin Wang,Kui Shi,Michael Kappl,Yifeng Lei,Sheng Liu,Longjian Xue
The hexagonal epithelial cells covered with mucus are believed to be responsible for the superior adhesion ability of tree frogs under dry and wet conditions. In spite of good progress made in the past years, many questions about the mechanism of wet adhesion remain to be addressed. Here, a tree frog-inspired wet adhesive, termed structured hydrogel adhesive, with poly(acrylamide)/poly(vinyl alcohol) hydrogel to mimic the hexagonal epithelial cells and glycerol–water mixture to mimic the mucus is reported. The combined analysis of adhesion force and work of adhesion reveals the major contribution of direct solid–solid contact in wet adhesion. The contributions of capillarity and viscosity of liquid are qualitatively decoupled by regulating the fluid components and the temperature. The study offers an excellent model system and a great opportunity to gain deep insight into wet adhesion of animals, like tree frogs, which may pave the way for the design of adhesives for wet environments.
研究领域:
生物材料学
·
仿生学
✓ 已验证
产品关联
DOI
高影响因子
AICHE JOURNAL
·
2024
·
IF 3.5
Liming Xia,Bofeng Zhang,Gang Hou,Li Wang,Sibao Liu,Guozhu Liu
Structured catalysts coatings exhibit excellent performance on non-adiabatic gas–solid process, deriving from their enhanced heat and mass transfer properties. However, the coating catalysts prepared by traditional hydrothermal method of zeolite encapsulating noble metal are prone to spalling, especially under conditions of large flow rate and high temperature. Herein, we prepared PtZn clusters encapsulated in silicalite-1 zeolite coating on stainless steel with high bonding strength by an improved in situ growth method. The optimized catalyst exhibited ultra-thin, uniform, continuous, and high degree of crosslinking, thereby enhancing mass transfer and thermal stability. In propane dehydrogenation reaction, the optimized PtZn@S-1-R showed a high specific activity of 14.7 mol C 3 H 6 $$ {\mathrm{mol}}_{{\mathrm{C}}_3{\mathrm{H}}_6} $$ mol Pt −1 s −1 and a propylene selectivity above 99% at 600°C with a high weight hourly space velocity of 120 h −1 . The metal-encapsulated zeolite coating catalysts broaden the application avenue for heterogeneous catalysis with great application prospects.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Peijian Wang,Jisong Zhang,Kai Wang,Guangsheng Luo,Pei Xie
NH3 was used as acid absorbent to intensify the reactions between aniline and benzoyl chloride in a microstructured chemical system in this work. By suppressing the side reaction, the addition of NH3 could reduce the reaction time needed for 99% reactants conversation to less than 1/10 of the condition without NH3. Furthermore, a complete kinetic model containing two rapid main reactions and two reversible consecutive side reactions was established, and six reaction rate constants and their corresponding activation energies and pre-exponential factors as well as confidence intervals were determined precisely. The accuracy of the obtained parameters was verified by comparing the calculated data with experimental data at extensional temperature. The kinetic model was used to optimize the intensification operating conditions, and effects of reactants concentration, temperature, NH3 addition amount, and NH3 feed methods were discussed based on the simulation results. This work proves that the microstructured chemical system not only provides an effective intensification ability but also develops a reliable platform for kinetic studies.
研究领域:
化学工程
·
反应动力学
✓ 已验证
产品关联
DOI
高影响因子
AICHE JOURNAL
·
2024
·
IF 3.5
Liming Xia,Bofeng Zhang,Gang Hou,Shuo Zhang,Li Wang,Guozhu Liu
Structured catalysts exhibit the advantages of high diffusion efficiency and low heat transfer resistance, which have attracted increasing attention to non-adiabatic gas–solid process. However, the metal-supported coating catalysts face the problems of weaker bond strength and severe sintering, especially under the conditions of large flow rate and high temperature. Herein, metal@Silicalite-1 structured catalysts with high adhesion and thermal stability were successfully prepared by hydroxylating the substrate with anatase. Rich surface Ti-OH significantly strengthened the adhesion stability of the zeolite coating. In propane dehydrogenation reaction, the optimized PtZn@S-1-15Ti showed a high specific activity of 49.6 mol C3H6 ·mol Pt −1 ·s −1 with propylene selectivity above 99% at 600°C. The introduction of anatase accelerated the aggregation of silicon sources and induced nucleation with growth content of zeolite increased by 3.6 times. It breaks the inherent contradiction between high loading amount and strong binding ability of coated catalysts, which broadens the avenues for industrial applications.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2019
·Vol. 9
·期 10
·834
·
IF 3.444
Jun Zhou,Xiaoqing Cao,Hongna Wang,Song Li
The catalytic oxidation of silanes to produce silanols using water as an oxidant at mild temperatures is a major challenge in Si-H activation. Highly efficient and easy-to-recycle catalysts based on Pd nanoparticles are in high demand. In this study, Pd nanoparticles embedded in an MgO porous overlayer on an Mg plate as a structured catalyst was prepared by the plasma electrolyte oxidation (PEO) technique. The Pd/MgO catalyst is strongly anchored to the MgO plate, building a structured catalyst. Fabrication parameters such as the temperature of the electrolyte and applied voltage significantly influenced the structure of the obtained Pd/MgO catalyst and in turn its catalytic activity. The catalytic activities of Pd/MgO were evaluated by activation of a Si-H bond for catalyzing the aqueous oxidation of silanes to silanol at mild temperatures. The catalytic activity of Pd nanoparticles is favored by their electro-deficient state due to influence from the MgO substrate. The Pd/MgO catalyst exhibits good performance stability during recycling. This work paves the way for fabricating structured catalysts with long-term stability and enhanced metal–oxide interaction.Keywords:structured catalyst;Pd nanoparticles;metal–oxide interaction;silanol
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Wenfeng Zhou,Xiao-Hui Li,Wen-Dong Yao,Huaiguo Xue,Sheng-Ping Guo
Inorganic compounds with mixed anions attract broad interest recently in view of their rich structural chemistry and physical performance. Specifically, chalcogenide borates are receiving increasing attention though they are in their infancy. Here, the chalcogenide borate Zn 8 Se 2 (BO 2 ) 12 is revisited by focusing on its second-harmonic generation (SHG) activity. Its sodalite cage structure is elucidated in detail and correlates with the SHG behavior. Its optical band gap is determined to be 4.42 eV. Theoretical calculations on its electronic structure and optical properties are performed and the results are well consistent with the experimental ones. Besides, the structural chemistry with related structures and possible SHG improvement strategies are discussed.
研究领域:
无机化学
·
材料科学
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2016
·
IF 4.052
Xiao-Wei Chen,Ya-Jun Chen,Jin-Mei Wang,Jian Guo,Shou-Wei Yin,Xiao-Quan Yang
A current challenge in the area of food emulsion is the design of microstructure that provides controlled release of volatile compounds during storage and consumption. Here, a new strategy addressed this problem at the fundamental level by describing the design of organogel-based emulsion from the self-assembly of β -sitosterol and γ -oryzanol that are capable of tuning volatile release. The results showed that the release rate ( v 0 ), maximum headspace concentrations ( C max ) and partition coefficients ( k a / e ) above structured emulsions were significantly lower than unstructured emulsions and controlled release doing undergo tunable though the self-assembled interface and core fine microstructure from internal phase under dynamic and static condition. This result provides an understanding of how emulsions can behave as delivery system to better design novel food products with enhanced sensorial and nutritional attributes.
研究领域:
食品科学
·
胶体化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 141
·期 10
·e55066
·
IF 3
Chongyang Yang,Liyang Song,Yumiao Sun,Yuheng Han,Ting Wang,En Zeng
To overcome challenges in pigment dispersion, especially for difficult-to-disperse pigments like phthalocyanine blue, the structure of dispersants has been studied in recent years. Herein, we present the development and performance evaluation of a structured polymer dispersant for efficient dispersion of phthalocyanine blue and color paste preparation. The dispersant was synthesized using a two-step free radical polymerization process, allowing precise control over its structure. The study investigates the impact of key factors on dispersion, including the molecular weight of the hydrophilic long-chain poly(ethylene glycol) monomethyl ether (MPEG), the ratio of anchoring groups styrene (St) and dimethylaminoethyl methacrylate (DMAEMA), and the dispersant dosage. Optimal stability was achieved with MPEG-400 as the hydrophilic long chain and a St:DMAEMA ratio of 1:1, along with a MPEG-400AA:AA ratio of 0.5:1 at 2000 r min −1 . At a dispersant dosage of 25%, the particle size of the color paste measured 340 nm, with viscosity reaching 600 mPa·s. The structured dispersant effectively synergized spatial potential resistance and electrostatic effects to achieve stable pigment dispersion. These findings offer promising prospects for advancing dispersant technologies, with implications for improving color-based applications across various industries, such as paints, coatings, and inks.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Food Bioscience
·
2024
·
IF 4.8
Hua-Wei Zhang,Ke Cheng,Jing-Jing Tang,Ling-Zhi Liu,Ruo-Xuan Qin,Yi-Nuo Sun,Jiang-Hua Zhang,Da-Yong Zhou
To synthesize structured phospholipids (SPLs) in an efficient and green manner is of great significance. Herein, novel Fe 3 O 4 @SiO 2 - Aspergillus oryzae lipase (AOL)/copper phosphate trihydrate nanoflowers (FLCNs) were prepared by coprecipitation method and then characterized by energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and vibrating sample magnetometer etc. FLCN activity was further evaluated by promoting functional medium-chain SPL (MCSPL) or short-chain SPL (SCSPL) synthesis via biotransesterification between soybean lecithins and medium-chain fatty acids (MCFAs) or short-chain fatty acids (SCFAs) under optimal reaction conditions. Moreover, FLCNs and free AOLs were comparatively assayed in enzymatic properties. As a result, FLCNs were successfully fabricated with sufficiently large surfaces and numerous enzyme active sites. Owing to these structural features, after reacting at 40 °C for 36 h with FLCN dosage of 6% and substrate mass ratio of 1:3:3, FLCNs exhibited much more excellent activity in MCSPL synthesis with 88.30 ± 0.63% of MCFA incorporation than benchmark enzymes and heterogeneous functional materials. Most significantly, in the first biosynthesis of functional SCSPLs facilitated by FLCNs, much superior SCFA incorporation of 66.55 ± 0.73% was obtained. Notably, FLCNs also possessed convenient magnetic separability together with superior pH and temperature tolerances, thermal and storage stabilities, and recyclability to free AOLs. In brief, the present investigation provides a new biological strategy for effective, economic, convenient, and eco-friendly SPL synthesis in food and pharmaceutical industries, highlighting its merits in functional lipid production.
研究领域:
食品科学
·
生物工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
AICHE JOURNAL
·
2015
·Vol. 61
·期 11
·3804-3811
·
IF 2.748
Peijian Wang,Kai Wang,Jisong Zhang,Guangsheng Luo
The reaction between aniline and benzoyl chloride is well known for producing high performance polymers and chemicals. But the fast main reaction and reversible consecutive side reaction make process rather complicated and no thorough kinetics study has ever been reported before. A microstructured chemical system, consisting of a micromixer, preheat exchange coiled capillaries, a delay loop, and a microhydrolyzer, was designed to carry out this reaction using N-methyl-2-pyrrolidone as the solvent. A kinetic model was established, and the values of kinetic constants, pre-exponential factors and activation energies of each reaction as well as their confidence intervals were acquired. With this model each substance concentration vs. residence time were obtained to help understand reaction process and further optimize operating conditions. Compared to earlier reports on this reaction, this microstructured chemical system provides more accurate parameters and can develop a reliable platform for kinetic study of similar chemical reactions. © 2015 American Institute of Chemical Engineers AIChE J , 61: 3804–3811, 2015
研究领域:
化学工程
·
反应动力学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Chenxu Guo,Miao Li,Wenming Guo,Jiawei Xie,Hang Qin,Moyu Liao,Yi Zhang,Pengzhao Gao,Hanning Xiao
Methanol steam reforming (MSR) is considered as a promising approach to provide hydrogen for proton-exchange membrane fuel cells. However, it is challenging to develop effective and durable Cu-based catalysts. Herein, Cu-ZnO catalysts are prepared by facile quenching of ZnO in copper nitrate solution followed by reduction to obtain the desired metal loading and induce the doping of surface metal heteroatoms for producing more vacancies. Catalysts enriched with oxygen vacancies can efficiently activate H 2 O and rapidly transform C-containing intermediates, resulting in higher methanol conversion and lower CO selectivity. As a result, the quenched optimal catalyst achieves 100 % methanol conversion and 0.05 % CO selectivity at 280 ℃, exhibiting the excellent catalytic performance in MSR reaction. In practical applications, structured catalysts are more attractive for large-scale catalytic reactions owing to the low pressure drop and high utilization efficiency. Therefore, ZnO-Cu 3 catalyst is coated on cordierite honeycomb ceramics with 100 % methanol conversion and 0.04 % CO selectivity at 280 ℃. After 100 h of the reaction, the structured catalyst remains ∼ 92.3 % with CO selectivity varying from 0.02 to 0.06 %, demonstrating the good catalytic stability in the long-term experiment. In addition, the evolution of reactants and intermediates on the catalyst surface are briefly described by FTIR spectra. This study offers a novel and efficient approach to obtain highly active and durable catalysts with great potential for industrial-scale preparation and application.
研究领域:
催化化学
·
能源材料科学
·
燃料电池技术
✓ 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）