AICHE JOURNAL
·
2022
·Vol. 68
·期 7
·e17683
·
IF 4.167
Hui Guo,Yuchao Li,Cuncun Zuo,Yanxia Zheng,Xinpeng Guo,Jinguo Hao,Haofei Huang,Ming Wang,Tingting Ge
Homogeneous hydrogen transfer reactions of methacrolein (MAL) and isopropanol to methallyl alcohol (MAA) were investigated in batch reactor (Conv. 89%, Select 93.1%) and tubular reactor (Conv. 88.1%, Select 95%) using aluminum isopropoxide (Al(OPr i ) 3 ) as catalyst. Kinetic experiments on hydrogen transfer reactions and reaction order were investigated in batch reactor and tubular reactor. Response surface methodology was applied to optimize the optimum reaction conditions of hydrogen transfer reaction. Purification process of MAA from product mixture after hydrogen transfer reaction was simulated with Aspen Plus software; theoretical stages, reflux ratio, and feed stage of distillation tower were optimized. Density functional theory was used to investigate viable reaction pathway and to probe the catalytic mechanism between reactants and catalyst, including dehydrogenation, coupling, and hydrogenation reaction. Microscopic mechanisms of hydrogen transfer reaction from MAA to MAL were acquired in detail and could be easily extended to other series of hydrogen transfer reaction.
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LWT-FOOD SCIENCE AND TECHNOLOGY
·
2022
·
IF 6.056
Huimin Huang,Jiang Yi,Yuting Fan
In this research, 2, 2′-azobis (2-amidinopropane) dihydrochloride (AAPH) was chosen to evaluate the influences of peroxyl radical-induced oxidation on structural characteristics, emulsifying, and foaming properties of α-lactalbumin. Oxidative modification of α-lactalbumin resulted in the gradual increase of protein carbonyl groups from 1.7 to 5.5 nmol/mg and dityrosine concentration from 33.5 to 225 but the gradual decrease of free sulfhydryl groups from 8.2 to 2.0 nmol/mg. Moderate oxidation led to slight decreases of surface hydrophobicity of α-lactalbumin, whereas excessive oxidation resulted in the increase of surface hydrophobicity. Sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) demonstrated the formation of α-lactalbumin aggregates partly through the disulfide bond, consistent with the increase of particle size after oxidative modifications. Moderate oxidation was beneficial to interfacial properties, whereas exorbitant oxidation (AAPH>1 mmol/L) could lead to the reduction. Peroxyl radical-induced oxidative modification exhibited great potential to ameliorate the emulsifying, and foaming properties of α-lactalbumin.
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Green Energy & Environment
·
2022
·
IF 12.781
Jiakai Li,Changpeng Lv,Jiajia Song,Xiaoling Zhang,Xizhen Huang,Yingzhuo Ma,Haijie Cao,Na Liu
Superwetting materials have drawn unprecedented attention in the treatment of oily wastewater due to their preferable anti-fouling property and selective oil/water separation. However, it is still a challenge to fabricate multifunctional and environmentally friendly materials, which can be stably applied to purify the actual complicated wastewater. Here, a Ag/α-Fe 2 O 3 heterostructure anchored copper mesh was intentionally synthesized using a facile two-step hydrothermal method. The resultant mesh with superhydrophilicity and underwater superoleophobicity was capable of separating various oil/water mixtures with superior separation efficiency and high permeation flux driven by gravity. Benefiting from the joint effects of the smaller band gap of Ag/α-Fe 2 O 3 heterojunction, inherent antibacterial capacity of α-Fe 2 O 3 and Ag nanoparticles, favorable conductive substrate, as well as the hierarchical structure with superwettability, such mesh presented remarkably enhanced degradation capability toward organic dyes under visible light irradiation and antibacterial activity against both Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) compared with the pure α-Fe 2 O 3 coated mesh. Impressively, the mesh exhibited bifunctional water purification performance, in which organic dyes were eliminated simultaneously from water during oil/water separation in one filtration process. More importantly, this mesh behaved exceptional chemical resistance, mechanical stability and long-term reusability. Therefore, this material with multifunctional integration may hold promising potential for steady water purification in practice.
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MOLECULES
·
2022
·Vol. 27
·期 18
·5742
·
IF 4.927
Yang Liu,Xue Zhou,Dan Zhou,Yongxing Jian,Jingfu Jia,Fahuan Ge
Diabetes is a chronic metabolic disease, whereas α-glucosidases are key enzymes involved in the metabolism of starch and glycogen. There is a long history of the use of mulberry leaf (the leaf ofMorus alba) as an antidiabetic herb in China, and we found that chalcomoracin, one of the specific Diels–Alder adducts in mulberry leaf, had prominent α-glucosidase inhibitory activity and has the potential to be a substitute for current hypoglycemic drugs such as acarbose, which have severe gastrointestinal side effects. In this study, chalcomoracin was effectively isolated from mulberry leaves, and its α-glucosidase inhibition was studied via enzymatic kinetics, isothermal titration (ITC) and molecular docking. The results showed that chalcomoracin inhibited α-glucosidase through both competitive and non-competitive manners, and its inhibitory activity was stronger than that of 1-doxymycin (1-DNJ) but slightly weaker than that of acarbose. ITC analysis revealed that the combination of chalcomoracin and α-glucosidase was an entropy-driven spontaneous reaction, and the molecular docking results also verified this conclusion. During the binding process, chalcomoracin went into the “pocket” of α-glucosidase via hydrophobic interactions, and it is linked with residues Val544, Asp95, Ala93, Gly119, Arg275 and Pro287 by hydrogen bonds. This study provided a potential compound for the prevention and treatment of diabetes and a theoretical basis for the discovery of novel candidates for α-glycosidase inhibitors.Keywords:mulberry leaf;chalcomoracin;α-glucosidase inhibitor;enzymatic kinetics;molecular docking
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ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Jie Cheng,Hao Qin,Hongye Cheng,Zhen Song,Zhiwen Qi,Kai Sundmacher
As traditional methods for retrieving natural vitamin E suffer from harsh operating conditions and poor process performance, seeking more energy-efficient and sustainable alternative approaches is highly desirable. In this work, deep eutectic solvents (DESs) as a class of emerging media are particularly proposed for the extraction of vitamin E (modeled by α-tocopherol) from deodorized distillates under mild operating conditions. To select DESs suitable for this task, a rational screening method is presented which covers the thermodynamic evaluation of individual components and component combinations, the assessment of environment, health, and safety (EHS) impacts of components, and the eutectic behavior estimation of component combinations. Based on experimentally reported DESs from the literature, individual components as well as random combinations of potential hydrogen bond acceptors (HBAs) and hydrogen bond donors (HBDs) are successively prescreened by COSMO-RS predicted thermodynamic properties. Five EHS-related properties of HBDs are assessed by VEGA. The formation of eutectics and the corresponding operating window of different HBA–HBD combinations are estimated by COSMO-RS solid–liquid equilibria prediction. Experiments are finally performed with the top-ranked DESs, which well validates the reliability of the screening method and identifies tetrabutylphosphonium chloride–ethanolamine (2:1) as a suitable DES for the α-tocopherol extraction.
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Materials
·
2022
·Vol. 15
·期 14
·4909
·
IF 3.748
Yunquan Liu,Huimei Shan,Chunya Zeng,Hongbin Zhan,Yanyue Pang
Graphene oxide and chitosan microspheres modified with α–FeO(OH) (α–FeO(OH)/GOCS) are prepared and utilized to investigate the performance and mechanism for Cr(VI) removal from aqueous solutions and the possibility of Fe secondary pollution. Batch experiments were carried out to identify the effects of pH, mass, and volume ratio (m/v), coexisting ions, time (t), temperature (T), and Cr(VI) initial concentration (C0) on Cr(VI) removal, and to evaluate adsorption kinetics, equilibrium isotherm, and thermodynamics, as well as the possibility of Fe secondary pollution. The results showed that Cr(VI) adsorption increased withC0,t, andTbut decreased with increasing pH andm/v. Coexisting ions inhibited Cr(VI) adsorption, and this inhibition increased with increasing concentration. The influence degrees of anions and cations on the Cr(VI) adsorption in descending order were SO42−> PO42−> NO3−> Cl−and Ca2+> Mg2+> Mn2+, respectively. The equilibrium adsorption capacity of Cr(VI) was the highest at 24.16 mg/g, and the removal rate was 97.69% under pH = 3,m/v= 1.0 g/L,T= 298.15 K, andC0= 25 mg/L. Cr(VI) adsorption was well fitted to a pseudo-second-order kinetic model and was spontaneous and endothermic. The best fit of Cr(VI) adsorption with the Langmuir and Sips models indicated that it was a monolayer and heterogeneous adsorption. The fitted maximum adsorption capacity was 63.19 mg/g using the Sips model under 308.15 K. Cr(VI) removal mainly included electrostatic attraction between Cr(VI) oxyanions with surface Fe–OH2+, and the adsorbed Cr(VI) was partially reduced to Cr(III) and then precipitated on the surface. In addition, there was no Fe secondary pollution during Cr(VI) adsorption.Keywords:hydroxyl iron oxide;graphene oxide;chitosan;Cr(VI) adsorption
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Journal of Water Process Engineering
·
2022
·
IF 7.34
Xingyu Fang,Ying Wu,Lijie Xu,Lu Gan
In this study, a series of coconut shell biochars (CSB) with different pyrolysis temperature were prepared and incorporated with α-MnO 2 for bisphenol A (BPA) degradation in water through activating peroxymonosulfate (PMS). The results showed that with the assistance of CSB, α-MnO 2 /CSB exhibited superior catalytic activity over pristine α-MnO 2 , in which CSB played multiple roles in the composite. Basically, CSB could effectively improve the dispersion and expose more active sites of α-MnO 2 . Besides, CSB could build solid interactions with α-MnO 2 and boost the electron transferring rate between catalyst, PMS and BPA. Moreover, α-MnO 2 and CSB were both enrolled in the generation of radical and non-radical species for BPA degradation. Having multiple active species, the α-MnO 2 /CSB composite could maintain high catalytic performance under a wide pH range with good reusability and adaptability. The existence of both radical and non-radical pathways was further verified through identifying the BPA degradation intermediates. This study provides a new insight for the design of novel composite catalyst for water decontamination using biochar as a multifunctional participant.
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BIOMEDICAL CHROMATOGRAPHY
·
2022
·Vol. 36
·期 4
·e5313
·
IF 1.911
Fu-Qin He,Yan-Jun Li,Zhao-Hui Guo,Juan Chen
Cyclocarya paliurus is an edible and medicinal plant exhibiting significant hypoglycemic effect. However, its active components are still unclear and need further elucidation. In this research, the active components of the leaves of C. paliurus responsible for the α -glucosidase inhibitory activity were screened and identified based on a spectrum–effect relationship study in combination with ultra-performance liquid chromatography tandem mass spectrometry (UPLC–MS/MS) analysis. The 70% ethanol eluate fraction of the leaves of C. paliurus with the strongest α -glucosidase inhibitory activity was obtained after extraction and purification with macroporous resin. Their chromatographic fingerprints (15 batches) were established by UPLC analysis and 32 common peaks were specified by similarity analysis. Their IC 50 values for α -glucosidase inhibition were measured by an enzymatic reaction. Several multivariate statistical analysis methods including hierarchical cluster analysis, principal component analysis, partial least square analysis and gray relational analysis were applied to explore the spectrum–effect relationship between common peaks and IC 50 values, and the chromatographic peaks making a large contribution to efficacy were screened out. To further elucidate the active components of leaves of C. paliurus , the 70% ethanol eluate fraction was characterized by UPLC–MS/MS analysis, and 10 compounds were identified. This study provides a valuable reference for further research and development of hypoglycemic active components of C. paliurus .
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JOURNAL OF NANOBIOTECHNOLOGY
·
2021
·Vol. 19
·期 1
·1-14
·
IF 10.435
Zhang Tian,Zheng Qiang,Fu Yike,Xie Congkun,Fan Gonglin,Wang Yifan,Wu Yongjun,Cai Xiujun,Han Gaorong,Li Xiang
Sonodynamic therapy (SDT), presenting spatial and temporal control of ROS generation triggered by ultrasound field, has attracted considerable attention in tumor treatment. However, its therapeutic efficacy is severely hindered by the intrinsic hypoxia of solid tumor and the lack of smart design in material band structure. Here in study, fine α-Fe 2 O 3 nanoparticles armored with Pt nanocrystals (α-Fe 2 O 3 @Pt) was investigated as an alternative SDT agent with ingenious bandgap and structural design. The Schottky barrier, due to its unique heterostructure, suppresses the recombination of sono-induced electrons and holes, enabling superior ROS generation. More importantly, the composite nanoparticles may effectively trigger a reoxygenation phenomenon to supply sufficient content of oxygen, favoring the ROS induction under the hypoxic condition and its extra role played for ultrasound imaging. In consequence, α-Fe 2 O 3 @Pt appears to enable effective tumor inhibition with imaging guidance, both in vitro and in vivo. This study has therefore demonstrated a highly potential platform for ultrasound-driven tumor theranostic, which may spark a series of further explorations in therapeutic systems with more rational material design. Graphical Abstract
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ENZYME AND MICROBIAL TECHNOLOGY
·
2021
·
IF 3.493
Min Lu,Hao Zhang,Xu Wang,Hui Jiang,Guang Hu,Feng-Qing Yang
A simple, convenient and efficient enzyme immobilization method through phytic acid (PA) modified α-Glucosidase (α-Glu)/Cu 3 (PO 4 ) 2 ·3H 2 O hybrid nanoflower was developed. The structural properties of the materials were studied by several characterization techniques. Subsequently, the enzymatic reaction conditions such as the pH value and temperature were optimized, and the enzyme kinetics and inhibition parameters were determined. The PA modified α-Glu/Cu 3 (PO 4 ) 2 ·3H 2 O hybrid nanoflower had better enzymatic activity under a wide pH range and high temperature than the free one. After seven successive cycles, the PA modified α-Glu/Cu 3 (PO 4 ) 2 ·3H 2 O hybrid nanoflower could still maintain approximately 63.0 % of its initial immobilized enzyme activity. The Michaelis-Menten constant ( K m ) and the half-maximal inhibitory concentration (IC 50 ) of acarbose were determined as 0.77 mM and 15.01 μM, respectively. In addition, the material was applied to evaluate the inhibitory activity of ten phenolic compounds on α-Glu, and epicatechin gallate, gallocatechin gallate, epigallocatechin gallate and rosmarinic acid showed good inhibitory activity with % of inhibition of (53.42 ± 2.39)%, (37.28 ± 1.32)%, (37.08 ± 0.63)% and (35.53 ± 0.23)%, respectively. These results indicate that the PA modified hybrid nanoflower is an efficient method of α-Glu immobilization.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Chen Wang,Yinglin Wang,Pengfei Cheng,Luping Xu,Fan Dang,Tianliang Wang,Zhaohui Lei
A highly sensitive and selective acetone gas sensor has been fabricated successfully by designing n-n heterojunction consisting of TiO 2 nanorods and α -Fe 2 O 3 branches. The structure and morphology of the TiO 2 / α -Fe 2 O 3 nanocomposites were examined via X-ray diffraction and scanning electron microscopy, respectively. TiO 2 nanorod (with the diameter about 42 nm) arrays were in-situ generated on the surface of Al 2 O 3 ceramic tubes by a simple hydrothermal process. In addition, α -Fe 2 O 3 branches grew on TiO 2 stems successfully in the second hydrothermal process. These nanorod branches had a relatively uniform length, which could be tunable by changing the concentration of iron precursor. The gas sensing properties of the pristine and α -Fe 2 O 3 branches-decorated TiO 2 nanorods sensors with regard to acetone gas were investigated. The results indicated that the sensor based on TiO 2 / α -Fe 2 O 3 heterostructures measured at 225 °C had a higher response of 21.9 toward 100 ppm of acetone gas which was about 9 times higher than pristine TiO 2 nanorods sensor. The dominant mechanism for enhanced sensing properties were discussed in detail with the semiconductor depletion layer model and TiO 2 / α -Fe 2 O 3 n–n heterojunction theory.
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Food Science & Nutrition
·
2021
·Vol. 9
·期 6
·2843-2852
·
IF 2.863
Yongfu Li,Yuanshan Yu,Qiqi Luo,Yangbo He,Zhuxi Tian,Yueliang Zhao
Rosa roxburghii seed oil is obtained from the seeds left following pressing of the juice from R. roxburghii fruit. The total oil content of R. roxburghii seed was around 9.30%. The fatty acid profile of the oil was determined by gas chromatography (GC). Among the 11 fatty acids identified in the oil, seven were unsaturated fatty acids (UFAs) (92.6%); four were saturated fatty acids (SFAs) (7.17%). Then, the kinetics of formation of trans -fatty acids was studied by GC. Heat treatment of R. roxburghii seed oil showed an increase in the relative percentage of linoleic acid and α-linolenic acid isomers with increasing temperature and time. The formation of linoleic acid and α-linolenic acid isomers followed a zero-order reaction. The presence of O 2 enhanced the isomerization of these UFAs. In addition, the rate constants and activation energies for the geometrical isomerization of UFAs in R. roxburghii seed oil were presented. Overall, R. roxburghii seed oil contains high UFA contents. Heating temperature and duration and the presence of O 2 should be considered to reduce the formation of trans -fatty acids during thermal treatment of R. roxburghii seed oil.
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