JOURNAL OF SOLUTION CHEMISTRY
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2023
·Vol. 52
·期 9
·1033-1047
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IF 1.2
Li Ke,Li Renjiang,Duan Xiuzhi,Deng Dongshun
Emission of NH 3 or CO 2 containing tail gases will aggravate environmental problems of global climate warming, fog, and haze. Developing efficient absorbent for them is highly desirable. In present work, new type V pyrazole (Py)/glycerol (Gly) DESs with Py/Gly molar ratios of 1:1 and 1:2 were prepared. Their densities and viscosities with temperature were measured. The solubilities of NH 3 or CO 2 in two DESs were determined, with the near atmospheric solubilities of NH 3 and CO 2 up to 8.7052 mol·kg −1 and 0.0395 mol·kg −1 for Py/Gly DESs (1:1), respectively. Henry’s constant and the dissolution Gibbs free energy, enthalpy, and entropy changes of gas dissolution were obtained by correlating the experimental data. What’s more, Py/Gly DESs (1:1) presents potential ability to preferentially separate NH 3 from the tail gas containing NH 3 and CO 2 due to its ideal selectivity of NH 3 /CO 2 as high as 189.
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APPLIED CATALYSIS A-GENERAL
·
2023
·
IF 5.5
Fengqin Guo,Liguo Wang,Yan Cao,Peng He,Huiquan Li
A series of Mg 3 Al 1−x Ce x O composite oxide catalysts were prepared by co-precipitation for the transesterification of ethylene glycol to ethylene carbonate. The characterization results revealed that the addition of cerium changed the acid-base properties of the catalyst and that the strong basic sites on the catalyst surface played an important role in the reaction. The Mg 3 Al 0.9 Ce 0.1 O catalyst showed the highest catalytic activity (ethylene carbonate yield 98.1%). Compared with pure Mg-Al oxide, the appropriate addition of Ce was conducive to improving the surface basicity and adsorbed oxygen content of the catalyst. Additionally, the reaction process of the formation of ethylene glycol hydroxyl group with the alkoxy anion formed by the catalyst attacking the carbonyl carbon of nucleophilic dimethyl carbonate to form an adsorption intermediate (HEMC) on the catalyst surface for further intramolecular rearrangement to form ethylene carbonate was confirmed by operando infrared spectroscopy. The reaction kinetics shows that the reaction conforms to the second-order kinetic equation, and the activation energy is 53.71 kJ·mol −1 . Catalytic stability in a fixed-bed reactor was studied. After a long cycle of use (150 h), the yield of ethylene carbonate was stabilized at about 89.0%.
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Nano-Micro Letters
·
2023
·Vol. 15
·期 1
·1-16
·
IF 26.6
Zhou Zehua,Zhu Qianqian,Liu Yue,Zhang Yan,Jia Zirui,Wu Guanglei
NiCo/C aerogel was prepared by pyrolysis carbonization self-assembly of NiCo- metal–organic frameworks (MOFs).
The assembly mechanism of MOF aerogel was studied by adjusting the ratio of metal ion /BTC.
Aerogel combines hydrophobic, lightweight, self-cleaning, and electromagnetic wave absorption properties.
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MOLECULAR PHARMACEUTICS
·
2023
·
IF 4.9
Yaxin Cheng,Jinsong Tao,Yaqi Zhang,Long Xi,Run Han,Meng Xu,Simon Ming-Yuen Lee,Wei Ge,Yong Gan,Ying Zheng
Mesoporous silica nanoparticles (MSNs) are widely used in the biomedical field because of their unique and excellent properties. However, the potential toxicity of different shaped MSNs via injection has not been fully studied. This study aims to systematically explore the impact of shape and shear stress on the toxicity of MSNs after injection. An in vitro blood flow model was developed to investigate the cytotoxicity and the underlying mechanisms of spherical MSNs (S-MSN) and rodlike MSNs (R-MSN) in human umbilical vein endothelial cells (HUVECs). The results suggested that the interactions between MSNs and HUVECs under the physiological flow conditions were significantly different from that under static conditions. Whether under static or flow conditions, R-MSN showed better cellular uptake and less oxidative damage than S-MSN. The main mechanism of cytotoxicity induced by R-MSN was due to shear stress-dependent mechanical damage of the cell membrane, while the toxicity of S-MSN was attributed to mechanical damage and oxidative damage. The addition of fetal bovine serum (FBS) alleviated the toxicity of S-MSN by reducing cellular uptake and oxidative stress under static and flow conditions. Moreover, the in vivo results showed that both S-MSN and R-MSN caused cardiovascular toxicity in zebrafish and mouse models due to the high shear stress, especially in the heart. S-MSN led to severe oxidative damage at the accumulation site, such as liver, spleen, and lung in mice, while R-MSN did not cause significant oxidative stress. The results of in vitro blood flow and in vivo models indicated that particle shape and shear stress are crucial to the biosafety of MSNs, providing new evidence for the toxicity mechanisms of the injected MSNs.
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Food Chemistry-X
·
2023
·
IF 6.1
Xiaojing Fan,Bin Zhang,Xing Zhang,Zhiqing Ma,Xianchao Feng
This study aimed to investigate the application potential of Portulaca oleracea extract (POE) in active packaging for the preservation of chilled meat. First, the antioxidant capacity and active ingredients of POE were systematically studied. The results demonstrated that POE has excellent antioxidant capacity and contains abundant antioxidant compounds. Subsequently, antioxidant-active packaging films based on chitosan and starch containing different concentrations of POE (CS/POE films) were successfully developed. The main physicochemical and mechanical properties of the CS/POE films were characterized and evaluated. The CS/POE films exhibited remarkable antioxidant activity and can significantly reduce lipid oxidation in meat. Compared with polyethylene film, the CS/POE films-treated meats had better preservation effects and longer shelf-life. These findings suggested that CS/POE film has the potential to become a good alternative to conventional plastics in food packaging. In conclusion, Portulaca oleracea extract is an excellent natural antioxidant with great potential in active packaging for chilled meat preservation.
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EXPERIMENTAL CELL RESEARCH
·
2023
·
IF 3.7
Hanqing Zhu,Hongliang Zhang,Jiahui Guo,Chao Zhang,Quanwu Zhang,Fenghou Gao
Mdm2 promotes the ubiquitination and degradation of p53, while Mdm2-p60 can bind to p53 and reduce the Mdm2-induced p53 ubiquitination to improve its stability. USP2a can deubiquitinate and stabilize Mdm2, whether USP2a can regulate Mdm2-p60 needs to be further confirmed and elucidated. We found that oxidative stress can up-regulate USP2a at the post-transcriptional level and induce USP2a to be oxidized by forming inter-subunit disulfide bonds . The oxidized USP2a is closely related with cell apoptosis. In apoptotic cells, oxidized USP2a has enhanced protein stability and further stabilizes Mdm2-p60 through deubiquitination , and the USP2a-Mdm2-p60-p53 axis plays a role in cell apoptosis. Altogether USP2a is oxygen sensitive, oxidized USP2a exerts apoptotic effects through the Mdm2-p60-p53 axis, which provides an experimental basis for regulating p53 apoptotic signaling by targeting USP2a.
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ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Dan Li,Cuiping Li
A class of CO2-binding organic liquids (CO2-BOLs) composed of 1,1,3,3-Tetramethylguanidine (TMG) and Glycerol (Gly) and Gly’s amino derivatives were developed for highly efficient and reversible CO2 capture. These CO2-BOLs exhibited high gravimetric CO2 solubility up to 0.196 g CO2·g–1 at 313.2 K and 1.0 atm, superior to most functionalized ILs and other absorbents. The influential factors of CO2 absorption, such as components of CO2-BOLs, absorption temperature, and CO2 partial pressure together with water contents were investigated, and the recyclability of CO2-BOLs was verified to be excellent. The absorption mechanism of CO2-BOLs was explored with the help of spectral analysis, quantum chemical calculation, and thermodynamic analysis. All the results revealed that chemisorption took place once these CO2-BOLs were exposed to CO2, and alkyl guanidine carbonates were produced. Besides, it is illustrated that introducing the amino group to Gly could reduce the nucleophilic reactivity of CO2-BOLs, along with the absorption enthalpy simultaneously.
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PROCESS BIOCHEMISTRY
·
2023
·
IF 4.4
Peiyi Wang,Baoming Tian,Zhiwei Ge,Jicai Feng,Jian Wang,Kai Yang,Peilong Sun,Ming Cai
Ultrasound and deep eutectic solvent (DES) are two green and efficient techniques in extraction. In this study, an eco-friendly extraction of phenolic compounds from Dendrobium officinale leaves (DOLs) was investigated. Ten DESs containing choline chloride, betaine , organic acids, polyols and amide, were tailored for extraction. Choline chloride-oxalic acid showed the most promising efficiencies for phenolics as 9.84 ± 0.19 mg GAE/g DW. Ultrasound-assisted DES (UADES) were optimized by a Box-Behnken design of response surface methodology. The optimum conditions were ultrasonic power 330 W, extraction temperature 60 ℃, and liquid-solid ratio 53:1 mL/g with a total phenolic content (TPC) of 17.50 ± 0.35 mg GAE/g DW. Compared with a single or triple frequency ultrasound, a dual-frequency of 40/60 kHz treatment for 15 min made TPC up to be 25.15 ± 1.46 mg GAE/g DW. About 13 phenolics were identified by UPLC-Triple-TOF/MS as the crucial phenolics in extracts , such as rutin and apigenin flavonoids . In addition, leave surface changed dramatically by UADES. These phenolic extracts had eminent antioxidant capacities, such as DPPH• scavenging rate of 65.4% and FRAP value of 0.234 mmol/L FeSO 4 at TPC of 4 mg/mL. Accordingly, dual-frequency UADES is a meaningful and green technology for extraction of phenolic compounds.
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Petroleum Science
·
2023
·
IF 5.6
Shi-Hao Chen,Chuan-Lin Mou,Wen-Long Ma,Ya-Dong Li,Zi-Yu Tang,Hong-Bo Deng
Here, we report the construction of magnetic core-shell microparticles for oil removal with thermal driving regeneration property. Water-in-oil-in water (W/O/W) emulsions from microfluidics are used as templates to prepare core-shell microparticles with magnetic holed poly (ethoxylated trimethylolpropane triacrylate) (PETPTA) shells each containing a thermal-sensitive poly ( N -Isopropylacrylamide) (PNIPAM) core. The microparticles could adsorb oil from water due to the special structure and be collected with a magnetic field. Then, the oil-filled microparticles would be regenerated by thermal stimulus, in which the inner PNIPAM microgels work as thermal-sensitive pistons to force out the adsorbed oil. At the same time, the adsorbed oil would be recycled by distillation. Furthermore, the adsorption capacity of the microparticles for oil keeps very stable after 1st cycle. The adsorption and regeneration performances of the microparticles are greatly affected by the size of the holes on the outer PETPTA shells, which could be precisely controlled by regulating the interfacial forces in W/O/W emulsion templates. The optimized core-shell microparticles show excellent oil adsorption and thermal driving regeneration performances nearly without secondary pollution, and would be a reliable green adsorption material for kinds of oil.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Feng Wang,Chao Li,Haohao Wang,Lu Yu,Fuming Zhang,Robert J. Linhardt
Natural amino acid polymers have been wide-used as bio-compatible emulsion stabilizers . In this study, Amphiphilic O(Phe- r -Glu)s were synthesized through the papain-catalyzed random polymerization of L -phenylalanine and L -glutamate with the major degree of polymerization value of 6–7. The polymerization yield was increased by more than 35 % using choline to reduce the energy barrier for the amino substrates to form the tetrahedral intermediate with the catalytic triad. The squalene/water emulsions stabilized by O(Phe- r -Glu) nanoparticles were pH-insensitive at pH 1–12. The investigation of mechanism found the combined effects of steric hindrance , electrostatic repulsion and the viscosity of the emulsion contributed to the stability of the emulsion droplets. Under acidic condition, the layers of O(Pho- r -Glu)s particle aggregates formed around the emulsion droplets and the higher viscosity of emulsion mainly contributed to the stability of emulsions . At basic condition, the strong electrostatic repulsion between emulsion droplets covered by the negatively charged O(Pho- r -Glu) particles and the steric hindrance contributed mainly to the prevention of the coalescence of emulsion droplets. The application of enzymatically synthesized amphiphilic peptides in emulsion, along with tunable performance through the polymerization of amino substrates, is in line with the sustainable development requirements in fields such as pharmaceuticals, food and cosmetics.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yufen Li,Ruijie Wang,Shouzheng Jiao,Hua Lai,Yuyan Liu,Zhongjun Cheng
Surfaces with switchable adhesion have been vigorously investigated over the past decades by mimicking the unique adhesive mechanisms of living systems. However, designing a universal intelligent adhesive surface for both solid and liquid remains a challenge. Herein, drawing inspiration from the controllable capillary forces generated by muscle movements and oil-secretion on the foot pads of the beetle ( Hemisphaerota cyanea ), we report a novel oil-loaded shape memory polymer (SMP) micropillars with such smart controllability. Based on the shape memory effect (SME) of the SMP, the pillars can be reversibly switched between the tilted state and the upright state, which simultaneously changes the distribution of the trapped oil, and thus generates different capillary forces. This variation results in reversible adhesion behaviors of the surface to diverse solids including flat glass, CD disk, polytetrafluoroethylene (PTFE), rough glass, sandpaper, nylon net, and liquid droplets like acid, basic, salt-containing water droplets, and some organic liquids such as glycol, glycerol, and formamide. Given its smart adhesion, the surface was further applied in in-situ gripping/release of solid objects and directed liquid shedding. This work provides a new design strategy for smart adhesive materials, which may contribute to the development of smart grippers, microfluidics, etc.
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LWT-FOOD SCIENCE AND TECHNOLOGY
·
2022
·
IF 6.056
Weiqi Liu,Yuanyuan Deng,Zhihao Zhao,Zhencheng Wei,Yan Zhang,Xiaojun Tang,Guang Liu,Ping Li,Pengfei Zhou,Mingwei Zhang
The effectiveness of deacidification approaches in the industrialization of high-acid rice bran oil (RBO) remains a significant challenge in obtaining a high-quality version of the edible product. The effects of four deacidification procedures on the lipid composition of RBO were described by using UPLC-Q-TOF-MS, and 34 glyceride lipids, including 15 triacylglycerols (TAG), 16 diacylglycerols (DAG), and 3 monoacylglycerols (MAG), were identified and quantified. A multivariate statistical analysis verified that the compositions and contents of the lipids significantly varied among various deacidification routes. Seven significantly different lipids were identified for potential use as potential biomarkers to differentiate one variety from the other deacidification routes. Our findings in this text will contribute to provide a theoretical foundation for the understanding of deacidification techniques of applications and processes for the edible oil industry.
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危险品化学品经营许可证（带存储）