RESEARCH ON CHEMICAL INTERMEDIATES
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2022
·Vol. 48
·期 9
·3753-3772
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IF 3.134
Hou Qingyao,Qin Langlang,Peng Xueer,Zhou Chenyang,Li Xuelian,Zhang Jiandong,Gao Lili
The development of catalysts with high catalytic activity and convenient recycling property is the long-term goal of sulfate-based advanced oxidation processes for the degradation of organic pollutants. In this work, a kind of iron/copper oxide hybrid catalyst (α-Fe 2 O 3 /γ-Fe 2 O 3 /Cu 2 O, CuFe-13) with both higher catalytic performance and paramagnetism was synthesized using a modified method for conventional CuFeO 2 . Through X-ray diffraction and infrared spectra characterization, the catalyst was verified a hybrid of α-Fe 2 O 3 , γ-Fe 2 O 3 and Cu 2 O, in which the exist of magnetic γ-Fe 2 O 3 was the main cause for CuFe-13’s paramagnetism and convenient magnetic recycling property. The mechanism for CuFe-13’s excellent catalytic performance was primarily investigated. Through scanning electron microscope, X-ray photoelectron spectroscopy, N 2 adsorption–desorption measurement, radical quenching experiments, and electron paramagnetic resonance characterization analysis, the CuFe-13 represented larger surface area, bigger porosity, more efficient synergistic effect among Cu, Fe, and O than CuFeO 2. The generation of various of reactive oxygen species (ROS), including sulfate radical ( \({\text{SO}}_{4}^{\cdot - }\) ), hydroxyl radical ( · OH), and singlet oxygen ( 1 O 2 ), especially 1 O 2 were more, which might lead to CuFe-13’s higher catalytic performance. The effects of PMS concentration, CuFe-13 dosage, initial pH, initial OG concentration were analyzed. The optimal removal efficiency of OG could be achieved 100% within 20 min with 1 mM PMS and 0.2 g L −1 CuFe-13 under neutral condition. This study provided an efficient PMS-activated catalyst for degradation of organic pollution.
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INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
·
2022
·Vol. 58
·期 7
·3958-3968
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IF 3.612
Mengqing Zhang,Zhenna Zhang,Lichun Guo,Wei Zhao
Summary In order to make full use of Sargassum fusiforme (S. fusiforme) , subcritical water treatment, an environmentally friendly method, was used to degrade polysaccharides to enhance their functional activity. Results revealed that average molecular weight decreased with increasing subcritical water treatment time or temperature. The depolymerisation kinetic was found to follow a first-order kinetics model fitted to 1/ M t – 1/ M 0 = k • t . Structural characterisation exhibited that subcritical water treatment changed the molar ratio composition of monosaccharides, while the main functional groups of S. fusiforme polysaccharides did not change significantly. Rheological characterisation demonstrated that the three degraded polysaccharides displayed shear-thinning behaviour and viscoelasticity. Except for natural polysaccharides, the α-glucosidase inhibitory activity of the three degraded polysaccharides was superior to that of acarbose. Consequently, this study can provide scientific evidence for subcritical water treatment as a green and efficient method to prepare bioactive polysaccharides with low molecular weight.
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SENSORS AND ACTUATORS B-CHEMICAL
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2022
·
IF 9.221
Qianchun Zhang,Yuxian Zhao,Xuan Shang,Shan Tang,Li Jiang,Yun Wu,Qin Zhou,Shiqin Li
Methallyl alcohol (MA), which is a common volatile organic compound, in vapor form can cause respiratory irritation, headache, nausea, and vomiting. Therefore, the development of a highly selective, excellently sensitive, and efficient sensor for rapidly identifying trace MA is essential. In this study, a La 2 O 3 /α-Al 2 O 3 composite with excellent cataluminescence (CTL) activity in the presence of MA was successfully synthesized. The CTL sensor based on as-prepared La 2 O 3 /α-Al 2 O 3 exhibited high selectivity for MA vapor as well as response and recovery times of 1 and 6 s, respectively. Under the optimal conditions for MA detection, the La 2 O 3 /α-Al 2 O 3 sensor exhibited a linear range of 0.0025–0.50 mg/L (correlation coefficient, R 2 = 0.998) and a low limit of detection of 0.61 μg/L at a signal-to-noise ( S/N ) = 3. The La 2 O 3 /α-Al 2 O 3 sensor was also used to determine the MA content in spiked samples and volatile gases generated from a medicine cabinet. Excellent recoveries in the range of 82.5–107% were obtained, with a corresponding relative standard deviation ( n = 5) in the range of 2.1–4.7%. Furthermore, the CTL sensing mechanism was investigated through density functional theory and high-performance liquid chromatography-ultraviolet analyses.
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INDUSTRIAL CROPS AND PRODUCTS
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2022
·
IF 6.449
Wenquan Huang,Shiyuan Liu,Zhiqiang Li,Yingying Liu,Qiuling Xie,Yanbin Jiang
The past decade has witnessed rapid development in zein-based drug delivery systems . However, the lack of a deep understanding of self-assembly and co-self-assembly between drug and zein has limited its application. In this work, α and β-zein, the main ingredients of zein, were separated and the different self-assembly behaviour was investigated, respectively. In ethanol solution, α-zein shows uncontrollable self-assembly and explosive nucleation. The nano-mechanical properties investigated by AFM show that α-zein nanoparticles self-assembled in the ethanol possessed a higher adhesion force (99.45 ± 6.90 nN), which explains its uncontrollable self-assembly. After loading with paclitaxel (PTX), Young’s modulus of α-zein had significantly reduced from 525.57 ± 53.82–95.35 ± 20.98 MPa, which implies that the PTX-α-zein nanoparticle has a loose structure. The interaction between drug and carrier was studied using a fluorescence quenching experiment, and the mathematical model was established. The result shows that the main driving force for interaction between PTX and α-zein is the hydrophobic force, while interaction between PTX and β-zein is hydrogen bonding and Van der Waals forces. The negative ΔG value indicates that the binging between PTX and α-zein or β-zein is a spontaneous process although the nature of the interaction is somewhat different. An in vitro cytotoxicity study shows that the different self-assembly behaviour resulted in different cell viability . Finally, a possible self-assembly mechanism of α and β-zein was proposed. It is anticipated that a fundamental understanding of self-assembly between drug and α or β-zein will provide an important foundation for its application in biological and material fields.
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Journal of Physical Chemistry C
·
2022
·
IF 4.177
Xueying Chen,Yeqing Chen,Jie Huang,Chen Li,Zongming Ni,Kang Zhang,Mingxuan Cao,Ting Yu,Yan Chen,Xin He,Yang Li
Cubic-phase CsPbI3 perovskite nanocrystals (CsPbI3 NCs) are widely used as a promising luminescent material in optical devices such as light-emitting diodes and lasers due to their high photoluminescence quantum efficiency and excellent color purities. However, the CsPbI3 lattice is more likely to face the problem of phase transformation due to the poor thermodynamic stability, which would lead to the decrease of its photoluminescence quantum efficiency. In this work, α-CsPbI3 NCs were synthesized by the room-temperature dual-ligand-assisted re-precipitation method under the synergistic effect of n-octanoic acid (OTAC), oleylamine (OLA), and (3-aminopropyl)triethoxysilane (APTES). The anionic OTAC and cationic OLA ligands interacted with the Pb2+ and I–, respectively, on the surface of the α-CsPbI3 NCs to passivate the defects on the surface. By the adjustment to the volume ratio of the OTAC to OLA, the synergistic effects of the dual ligands inhibited the distortion of the octahedral [PbI6]4– and maintained the cubic perovskite structure of the α-CsPbI3 NCs. The hydrolysis of APTES into the silica layer would provide efficient environmental protection and maintain the cubic phase of α-CsPbI3 at room temperature. The α-CsPbI3 NCs not only produce strong red emission upon the UV excitation but also exhibit strong up-conversion luminescent properties upon the near-infrared excitation at a low excitation power laser of 1064 nm, showing dual-mode luminescent characteristics as a promising material for potential applications in optical devices.
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Food Bioscience
·
2022
·
IF 5.318
Hui Wang,Xiaoli Kang,Shiwei Sun,Yichen Yin,Kun Jiang,Guodong Tang,Xinning Tang,Wei Wang
The roasting process of pyrogallol, a polyphenol compound distributed in coffee beverages , significantly enhanced its α -glucosidase inhibitory activity. In this study, a bioassay-guided isolation of the thermal reaction products of pyrogallol led to the identification of two potent α -glucosidase inhibitors, 4-4′ dimer of pyrogallol (4,4′-DP) and 4-5′ dimer of pyrogallol (4,5′-DP). Their α -glucosidase inhibitory activity was higher than that of pyrogallol, as evidenced by comparing the IC 50 values (206.2 ± 1.2 μ M for 4,4′-DP, 187.6 ± 2.6 μ M for 4,5′-DP, 2660 ± 60.1 μ M for pyrogallol). And the roasting products were more potent α -glucosidase inhibitors compared to acarbose (IC 50 = 695 ± 12.7 μ M). Enzyme kinetics demonstrated that 4,4′-DP and 4,5′-DP inhibited α -glucosidase in an uncompetitive and a non-competitive manner, respectively. Docking simulations revealed that the main interaction forces between these two compounds and α -glucosidase were hydrogen bonding and hydrophobic effect. These results suggested that a simple roasting process might increase the α -glucosidase inhibitory activity of pyrogallol-containing foods such as coffee beverages.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2022
·
IF 5.895
Qiaozhi Zhang,Zhijie Huang,Huatao Li,Congnan Cen,Ruixing Zheng,Cao Lili,Shufen Zhang,Yanbo Wang,Linglin Fu
As a complex reaction, biological consequences of the Maillard reaction (MR) on dietary proteins need to be deciphered. Despite previous studies on the structural and antigenic properties of ovalbumin (OVA) by MR, associated changes induced by specific MR intermediates and their downstream products are largely unknown. This study focused on the impacts of glycation by α-dicarbonyl compounds (α-DCs), intermediates of MR and precursors of advanced glycation end-products (AGEs), on the structural and IgE-binding properties of ovalbumin (OVA) under simulated heating. Methylglyoxal (MGO), glyoxal (GO), and butanedione (BU) were selected as typical α-DCs to generate glycated OVA with different AGE-modifications (AGE-Ms). The results showed that reactions between OVA and α-DCs generated OVA-AGE with various degrees of modification and conformational unfolding, and the reactivity of α-DCs followed the order GO > MGO > BU. Depending on the precursor type, the levels of 10 specific AGEs were verified, and the amounts of total AGEs increased with heating temperature and α-DC dosage. Compared to native OVA, glycated OVA showed reduced IgE-binding levels but with sRAGE-binding ligands, the extent of which was associated with the contents of total AGEs and Nε-carboxymethyllysine, and changes in certain protein conformational structures. High-resolution mass spectrometry further identified different AGE-Ms on the Lys and Arg residues of OVA, confirming variations in the glycation sites and their associations with the immunoreactive epitopes of OVA under different conditions.
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TENSIDE SURFACTANTS DETERGENTS
·
2022
·Vol. 59
·期 1
·39-50
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IF 1.058
Fuwen Tan,Xu Li,Jinxiang Dong
Fischer-Tropsch syncrude prepared via the Fischer-Tropsch synthesis (FTS) using a Fe-based catalyst is featured by its high content of linear α-olefins (C 5 –C 13 ). The utilization of C 6 –C 8 α-olefins for the synthesis of alkyl benzene sulfonate surfactants was performed in the present work via dimerization, benzene alkylation, and sulfonation. The effects of the reaction conditions on benzene alkylation over a trimethyl amine hydrochloride-acidic anhydrous aluminum chloride ionic liquid catalyst (Et 3 NHCl-AlCl 3 ) have been studied in detail using C 6 α-olefin dimers as a model alkylation agent. Under the optimal reaction conditions (molar ratio of AlCl 3 to Et 3 NHCl = 2, catalyst loading = 0.29 mol %, reaction temperature = 30 °C, and molar ratio of benzene to C 6 α-olefin dimer = 10) the conversion of the C 6 α-olefin dimer was 100% and the selectivity toward the mono alkylbenzene product was 91.0%. C 6 –C 8 α-olefin dimer alkylbenzene sulfonates (C 6 –C 8 DBS) were synthesized via sulfonation using chlorosulfonic acid and characterized using Fourier Transform Infrared (FT-IR) spectroscopy and Liquid Chromatography–Mass Spectrometry (LC–MS). The surfactant properties of the C 6 –C 8 DBS, including their equilibrium and dynamic surface tension, foaming, wetting and emulsifying capabilities, were closely explored and compared with a commercial linear alkylbenzene sulfonate (LAS). The limiting surface tension ( γ
CMC = 34.62 mN m −1 ) and critical micelle concentration (CMC = 2.15 mmol L −1 ) of C 6 α-olefin dimer alkylbenzene sulfonate (C 6 -DBS) were similar to those of LAS. Upon increasing the hydrocarbon chain length, the γ
CMC of C 6 -DBS, C 7 -DBS, and C 8 -DBS remained unchanged, while the CMC decreased. C 6 –C 8 -DBS exhibited foaming, emulsifying, and wetting properties comparable to LAS.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Shufen Wang,Xiaopeng Chen,Jiezhen Liang,Xiaojie Wei,Hairong Mo,Kaixi Deng,Linlin Wang
Investigating phase equilibrium on the terpenoid of the pine oleoresin system is of great importance for the usage relevant to the oleoresin. Herein, the binary and ternary isothermal vapor–liquid equilibrium (VLE) of α-pinene, longifolene, and abietic acid (three main components of oleoresin) at 313.15, 323.15, and 333.15 K were measured by headspace gas chromatography (HS-GC). There was no azeotropic behavior observed of α-pinene and longifolene. Abietic acid’s influence on separating α-pinene and longifolene was discussed. The relative volatilities of α-pinene and longifolene decrease in the presence of abietic acid, indicating a negative impact of abietic acid on their separation. The experimental data were correlated well with the nonrandom two-liquid, universal quasichemical, and Wilson models. The binary interaction parameters for each equation were also obtained, and the largest mean relative deviation of vapor-phase mole fraction and the largest absolute average deviation of pressure are 0.1975% and 0.0856 kPa, respectively.
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CELLULOSE
·
2022
·Vol. 29
·期 3
·1727-1737
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IF 6.123
Fu Enfa,Zhang Sijia,Luan Yu,Zhang Yuting,Saghir Summaira,Xiao Zhenggang
Most superabsorbent polymers (SAPs) are prepared based on synthetic polymers (from petroleum resources), making them costly, nondegradable, and not ecofriendly. To overcome these drawbacks, biodegradable and renewable natural materials are proposed as additions into SAPs. In this article, a new SAP composite was synthesized by using AA, AM, α-cellulose, and modified zeolite (MZE). The prepared SAP composites were analysed by FTIR spectroscopy, XRD, SEM and TGA. Then, their water absorbency and water retention capacity results were evaluated. AA and AM were successfully grafted to the α-cellulose chains, and MZE was uniformly dispersed in the SAP composite matrix as an inorganic filler, which endowed the SAP composites with a more undulant and coarser surface along with more abundant hydrophilic groups. In contrast with poly(AA-co-AM), the water absorbency of the prepared SAP composites increased by 93.88% in distilled water and 89.58% in 0.9 wt.% NaCl solution. Additionally, the water retention time of these SAP composites was 11.2 h when evaluated at 50 °C, which was a 71.79% increase. Moreover, both the T onset and T peak of the prepared SAP composites slightly increased compared with those of α-cellulose-poly(AA-co-AM), showing that the introduction of MZE could slightly improve the thermal stability of the SAP composites. These novel SAP composites with their excellent water absorbency and retention capacity could be applied to the agricultural and horticultural fields as water-keeping materials.
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CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Chen Chen,Xudong Zhang,Qiong Tang,Mingxing Tang,Xuekuan Li,Lei Liu,Jinxiang Dong
Using coal-based feedstocks to produce chemicals is of importance for the high value-added utilization of coal and the reduction of petroleum consumption. Alkyltetralins similar to naphthenic oil were successfully obtained through tetralin alkylation with various olefins. Various ionic liquids (ILs) were applied to catalyze alkylations, and Et 3 NHCl-AlCl 3 IL exhibited high catalytic activity under mild reaction temperature (80 °C), the selectivity of multi-alkyltetralins higher than 70% could be achieved at >99% tetralin conversion. Such catalyst was shown to be robust in the presence of trace water and oxygenated chemicals. COSMO-RS model was applied to predict the mutual solubility and interaction of tetralin, olefins and alkyltetralins in ILs. The experimental and calculated results demonstrated that the favorable interactions of shorter-chain olefins and ILs benefited to produce multi-alkyltetralins, and the low mutual solubility of reactants and products in ILs was helpful to the rapid separation of products in the system.
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BIOPROCESS AND BIOSYSTEMS ENGINEERING
·
2023
·Vol. 46
·期 9
·1331-1340
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IF 3.8
Yu Lishuang,Zou Cheng,Li Qingyun,Liu Zhaoming,Liu Youyan,Tang Aixing
Chemoenzymatic epoxidation of olefin mediated by lipase is a green and environmentally friendly alternative process. However, the mass transfer barrier and lipase deactivation caused by the traditional organic–water biphasic reaction system have always been the focus of researchers’ attention. To overcome these issues, we investigated the effects of reaction temperature and two important substrates (H 2 O 2 and acyl donor) on the epoxidation reaction and interfacial mass transfer. As a result, we determined the optimal reaction conditions: a temperature of 30 °C, 30 wt-% H 2 O 2 as the oxygen source, and 1 M lauric acid as the oxygen carrier. Additionally, by simulating the conditions of shaking flask reactions, we designed a batch reactor and added a metal mesh to effectively block the direct contact between high-concentration hydrogen peroxide and the enzyme. Under these optimal conditions, the epoxidation reaction was carried out for 5 h, and the product yield reached a maximum of 93.2%. Furthermore, after seven repetitive experiments, the lipase still maintained a relative activity of 51.2%.
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