Food Science & Nutrition
·
2020
·Vol. 8
·期 7
·3234-3242
·
IF 1.797
Yanyun Zhu,Hongji Chen,Leyan Lou,Yixin Chen,Xingqian Ye,Jianchu Chen
The copigmentation effects of three phenolic acids (ferulic acid, sinapic acid, and syringic acid) on the color and thermal stability of Chinese bayberry anthocyanins were investigated. The three copigments of ferulic acid, sinapic acid, and syringic acid were found to have significant effects on the color enhancement of bayberry anthocyanins ( p < .05). The maximum absorption wavelength of the anthocyanin aqueous solution exhibited a bathochromic shift, L * decreased, and a * increased with the increase in the molar ratio of copigments. The thermal stability of bayberry anthocyanins was significantly improved after copigmentation. No new anthocyanin derivatives appeared after copigmentation. The thermodynamic parameters (Δ G , Δ H , Δ S ) of the three processes were all negative, indicating the three copigmentations were generally spontaneous and exothermic. The equilibrium constant ( K ) of the sinapic acid group was the greatest among the three phenolic acids, indicating that sinapic acid was more effective in stabilizing the anthocyanins.
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LWT-FOOD SCIENCE AND TECHNOLOGY
·
2021
·
IF 4.952
Shulin Zhang,Li Tian,Jianhua Yi,Zhenbao Zhu,Xinling Dong,Eric Andrew Decker
Lipid and protein oxidation always causes the deterioration of foods and their shortened shelf lives. The aim of the present work was to evaluate the effect of high-intensity ultrasound on the chemical and physical stabilities of oil-in-water emulsions comprising a plant-based oil (walnut oil) and protein (almond protein isolate). Emulsions were produced using a three-step procedure: high-shear mixing, sonication, and homogenization. The sonication step was carried out for 30 min at three different energy densities: 0, 200, or 400 J/cm 3 . Increasing sonic energy densities resulted in much smaller particle size and more droplet charge of the freshly made emulsions. The sonication step also improved the physical stability of emulsified lipids during storage by suppressing the changes in the droplet size and charge. Meanwhile, sonication also inhibited the oxidation of emulsified lipids by decreasing the generation of lipid hydroperoxides and 2-thiobarbituric acid-reactive substances as well as protein by reducing the gain of carbonyls, the loss of free sulfhydryl groups and intrinsic tryptophan fluorescence, and the modification of molecular weights. The highest sonication energy density (400 J/cm 3 ) gave the best results. This study is expected to broaden the application of high-intensity ultrasound in protein emulsion production to improve their quality and acceptability.
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Polymers
·
2019
·Vol. 11
·期 9
·1476
·
IF 3.164
Yali Ji,Huimin Zhang,Canfu Zhang,Zhiyi Quan,Min Huang,Lili Wang
Highly luminescent silicon quantum dots (SiQDs) were prepared via one-pot hydrothermal route. Furthermore, the optimal synthetic conditions, dependence of the emission spectrum on the excitation wavelength and fluorescent stability of SiQDs were investigated by fluorescence spectroscopy. SiQDs exhibited bright blue fluorescence, and photoluminescence (PL) lifetime is 10.8 ns when excited at 325 nm. The small-sized SiQDs (~3.3 nm) possessed uniform particle size, crystal lattice spacing of 0.31 nm and silicon (111), (220) crystal planes. Luminescent SiQDs/sodium alginate (SA)-carboxymethylcellulose sodium (CMC) nanocomposite bio-polymer films were successfully fabricated by incorporating SiQDs into the SA-CMC matrix. Meanwhile, SiQDs not only impart strong fluorescence to the polymer, but also make the composite films have favorable toughness.Keywords:biopolymer;silicon quantum dots;nanocomposite polymer films;fluorescent;mechanical property
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RSC Advances
·
2025
·Vol. 15
·期 11
·8696-8706
·
IF 4.6
Zijian Wang,Ming Ke,Zhaozheng Song
Mordenite is extensively utilized in the domains of adsorption and catalysis owing to its excellent selectivity, stability, and renewability. In this work, the effects of crystal seeds, the ratio of SiO2/Al2O3, crystallization temperature, silicon source, and structure directing agents on the morphologies of mordenite are investigated by utilizing hexamethyleneimine (HMI) as the OSDA. Results indicate that the transformation of rod-like and flake-like mordenites is mainly related to the increasing ratio of SiO2/Al2O3, and the formation of flake-like morphology is related to various conditions. On a macro level, the rod-like and flake-like zeolites are formed by transforming amorphous precursors into small crystals and growing them epitaxially. On a micro level, HMIH+ progressively displaces Na+ to balance the framework charge with the increasing ratio of SiO2/Al2O3. DFT calculation and nuclear magnetic resonance results confirm the specific guidance of HMI on the T2 and T4 sites of the rod-like and flake-like mordenites. The conclusion can serve as a reference for regulating the morphology and active sites of mordenite.
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Asia-Pacific Journal of Chemical Engineering
·
2024
·Vol. 19
·期 4
·e3076
·
IF 1.4
Haoran Zhao,Yu Jia,Yihang Chen,Xuanyu Liang,Jinbo Hao,Binglin Chen,Chao He,Liang Liu,Chun Chang,Guizhuan Xu
Ethyl levulinate (EL) production from steam-exploded corn straw (SCS) in a cascade of reaction using a Brønsted (B) acid and a Lewis (L) acid in ethanol was studied. The entangled structure of corn straw could be obviously damaged through steam explosion when the pressure was 1.5 MPa holding 10 min. The content of cellulose can be increased from 35.9% to 46.8%, and the contents of hemicellulose and lignin were changed from 16.7% to 8.8% and 22.6% to 27.5%, respectively. EL yield was significantly increased from 10.7 to 24.6 wt% under optimal reaction conditions (L/B = 1/20 [mol/mol], 205°C, 90 min, 1.8 g of SCS, 60 mL of ethanol). According to kinetic models, the activation energies for the main and side reactions were 56.8 and 110.5 kJ mol −1 , respectively. It suggested that SCS was more easily to be converted to EL rather than other by-products. The highest occupied molecular orbital (HOMO)–lowest unoccupied molecular orbital (LUMO) energy gaps (HOMO-LUMO gaps) of cellobiose over the mixed acids in ethanol were significantly reduced with frontier molecular orbital (FMO) theory. This work provides an effective strategy for EL production from agricultural waste straws.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Ruichong Chen,Leiqing Tang,Yi Zuo,Jianqi Qi,Wei Feng,Haomin Wang,Zhangyi Huang,Tiecheng Lu
In this study, a shrinkage matching process was developed to achieve synchronous shrinkage of Li 4 SiO 4 and Li 2 TiO 3 during sintering, enabling the successful fabrication of a core-shell structured tritium breeder material with a Li 4 SiO 4 core and Li 2 TiO 3 shell to address the hygroscopicity of Li 4 SiO 4 . The shell thickness of the Li 4 SiO 4 @Li 2 TiO 3 core-shell breeding materials can be controlled in the range of 0–235 μm, and their moisture stability was systematically investigated at 10 % RH, 50 % RH, and 80 % RH. Results showed that increasing shell thickness significantly enhanced phase and mechanical stability in humid environments, although excessively thick shells reduced overall Li content. To understand these improvements, the moisture stabilization mechanism of this core-shell breeding ceramics was comprehensively analyzed. Notably, the core-shell pebbles with a shell thickness of 146 μm exhibited a satisfactory crushing load (80.5 N) and a suitable Li content (16.87 wt%), and maintained superior moisture stability after storage at 80 % RH for 14 days. This novel concept, preparation route, and elucidated mechanism of utilizing Li 2 TiO 3 shell to enhance the moisture stability of Li 4 SiO 4 matrix provide a new strategy for performance enhancement of advanced tritium breeding materials.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Jinjiao Pan,Yue Ma,Huazhen Rong,Yilei Zhang,Yu Guo,Chuan Gan,Lu Liu,Yihui Yuan,Ning Wang
Iodine pollution in water, especially from radioactive sources, represents a significant environmental challenge. Conventional water treatment methods often fail to efficiently remove iodine pollutants, particularly those present in low concentrations. In this study, an ionic nitrogen-rich porous organic polymer (NPOP-TIPA) was synthesized by engineering ionic sites into a nitrogen-rich porous organic polymer, to enhance the removal of multiple iodine pollutants from aqueous solutions. This synergistic design strategy improved NPOP-TIPA’s affinity for multiple iodine pollutants, including molecular iodine (I 2 ), iodide (I − and I 3 − ). Experimental results revealed that NPOP-TIPA exhibited excellent iodine removal efficiency and excellent reusability. Additionally, NPOP-TIPA effectively reduced iodine concentrations from an initial 5 ppm to below 20 ppb, demonstrating its practical applicability under real-world conditions. This study highlights the potential of ionic nitrogen-rich materials in improving multiple trace iodine pollutants removal and provides new perspectives on the design of advanced materials for water purification.
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JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Hammad Saulat,Weiquan Feng,Zhongzhuang Hu,Mengxing He,Jinming Lu,Yan Zhang,Jianhua Yang,Cheng He
Separation of butane isomers holds substantial importance across various industrial sectors due to their divergent chemical characteristics and pervasive applications. Their efficient separation into high-purity iso-butane (i-C 4 ) and normal butane (n-C 4 ) allows their optimal utilization while maximizing economic benefit and minimizing waste, though their separation presents significant challenges due to their similar physicochemical properties and energy-intensive separation requirements. Polycrystalline zeolite-based membrane separation processes emerge as an energy-efficient approach for separating butane isomers by reducing the total operating energy consumption as compared to the conventional distillation process. However, the fabrication cost of polycrystalline zeolite membranes is high, predominantly dictated by the production cost of the support (≈ 50-70 %) rather than the polycrystalline zeolite layer. Herein, we report the fabrication of polycrystalline MFI membranes on inexpensive coarse macroporous α-Al 2 O 3 tube supports (symmetrical supports) with an average pore size in the range of 2 ∼ 3μm for separating butane isomers. Macroporous α-Al 2 O 3 tube supports are coated with single (sheet-like MFI crystals) and dual (sheet-like MFI crystals + MFI crystals) seed layers to achieve the desired separation performances. For coating a single seed layer, MFI nanocrystals were employed as precursors for synthesizing sheet-like MFI crystals with a high aspect ratio as compared to the conventional MFI crystals. Taking advantage of the high aspect ratio of sheet-like MFI crystals, single seed layer was fabricated on coarse macroporous α-Al 2 O 3 tube support, eliminating the time-intensive steps to reduce the support pore size and reducing the problem of pore plugging. Subsequently, a dual seed layer (sheet-like MFI crystals + MFI crystals) was also created by hot dip coating the MFI crystals on the surface of a single seed layer with the aim of fabricating a more compact, continuous, and molecular sieving polycrystalline MFI membrane with enhanced separation performance for the separation butane isomers. After hydrothermal crystallization, polycrystalline MFI membrane (M-2) fabricated on a single seed layer exhibits a separation factor and n-butane permeance of 33.80 and 2.00x10 -7 mol/m 2 .Pa.s, respectively. In contrast, the polycrystalline MFI membrane (D-3) formed on a dual seed layer demonstrates a separation factor and n-butane permanence of 40.60 and 1.47x10 -7 mol/m 2 .Pa.s, respectively. Both these membranes demonstrate good stability and reproducibility. Fabrication of polycrystalline MFI membranes on inexpensive coarse macroporous tube supports is a crucial advancement in reducing fabrication costs and facilitating industrial implementation. However, substantial potential remains for further scaling up and enhancing the separation performance of current polycrystalline MFI membranes.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Weipeng Song,Junhua Zhang,Yong Sun,Rui Zhang,Lincai Peng,Huai Liu
Functionalizing biomass-derived furanic chemicals is of great importance towards biorefinery processes but challenging, especially working at elevated substrate concentrations. We herein report the intervention of 1,4-dioxane co-solvent availably to catalyze hydroxymethylation of furfuryl alcohol (FA) in formalin over Hβ zeolite, giving high yield to 2,5-dihydroxymethylfuran (DHMF), a versatile building block. Impressively, the facilitating effect of 1,4-dioxane on DHMF production became more pronounced with increasing FA feeding concentration, and the yield raised from 19.5 % to 67.8 % from a high FA concentration of 10 wt%. The 1,4-dioxane served not only as a catcher of formaldehyde hydrate to access substrate FA, but also as a shield to restrain undesirable condensation side-reactions. The developed protocol demonstrated an excellent universality in boosting the hydroxymethylation of electrondrawing-group-free furanic molecules (e.g., furan, 2-methylfuran). The understanding of these solvation effects can be employed to effectively manipulate and improve the hydroxymethylation of furanic compounds.
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ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Fanhao Meng,Xiaoyu Dong,Haiyang Wu,Zhiyuan Wu,Hui Dou,Xiaogang Zhang
Proton batteries are considered promising due to their high-power output, cost-effectiveness, and safety. However, they also face challenges such as low voltage, limited capacity, and poor cycle stability. To address these challenges, a dual-acid quasi-solid-state electrolyte (SSAE) is developed by combining H 2 SiO 3 with H 2 SO 4 . This electrolyte has the decomposition voltage of 2.15 V and ultra-high conductivity of 95 mS cm⁻¹ (1.5 mS cm⁻¹ at −70 °C). Leveraging this high decomposition voltage, the specific capacity of MoO 3 is successfully enhanced to 1.74 times than its original value at a current density of 5 A g −1 by harnessing the hydrogen evolution/oxidation reaction (HER/HOR) of lattice hydrogen (H· ad,s ) in MoO 3 at low potentials, which is typically regarded as a significant factor to suppress the gas evolution. Notably, the voltage achieved a record-breaking 1.8 V in the Prussian Blue Analog //MoO 3 system at room temperature. The full cell consisting of HVFe-PBA (pre-protonated vanadium hexacyanoferrate)//SSAE//MoO 3 exhibited outstanding electrochemical performance at both room temperature and low temperatures. As a proof-of-concept, a pouch cell is assembled with an energy density of 72.3 Wh kg −1 , and even it maintained an energy density of 40.7 Wh kg −1 at −60 °C.
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