FUEL
·
2022
·
IF 8.035
Xu Li,Jiaqi Li,Xiaohong Wang,Lijun Yang,Hong Xu,Jinxiang Dong
Despite the significant progress that has been made regarding the purification of C5–C9 linear α-olefins from the liquid products of Fischer–Tropsch synthesis, the energy-consuming separation of olefins and paraffins with the same carbon number has restricted their industrial development. Herein, we first propose a reaction-separation-utilization integrated process that combines the zirconocene/methylalumoxane-catalyzed selective dimerization of linear α-olefins to α-olefin dimers, which can then be separated from paraffins in FTS liquid products via conventional distillation and catalytically converted into branched-chain sulfonate surfactants through homogeneously organocatalytic sulfonation with sodium bisulfite. The resulting branched-chain sulfonates have been characterized by FTIR, HPLC , LC-MS, HR-MS, and NMR techniques. Their surfactant properties, including equilibrium surface tension, dynamic surface tension , foaming property, wetting ability, and emulsifying power, and detergency performance, have been thoroughly investigated. The results showed that the resulting branched-chain sulfonate surfactants exhibit superior surfactant properties and detergency performance in comparison with commercially applied linear alkylbenzene sulfonate (LAS). In view of the growing demand for anionic surfactants in the detergent and cosmetics industries , this study represents a new route for the use of α-olefins from the Fischer–Tropsch synthesis for the production of branched-chain surfactants.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2023
·
IF 6.1
Juwei Ao,Xuewei Pan,Qiang Wang,Hengwei Zhang,Kexin Ren,An Jiang,Xian Zhang,Zhiming Rao
α-Arbutin is extensively used in cosmetic industries. The lack of highly active enzymes and the cytotoxicity of hydroquinone limit the biosynthesis of α-arbutin. In this study, a whole-cell biocatalytic approach based on enzyme engineering and engineered cell modification was identified as effective in enhancing α-arbutin production. First, a sucrose phosphorylase (SPase) mutant with higher enzyme activity was obtained by experimental screening. Next, to avoid the oxidation of hydroquinone, we established an anaerobic process to improve the robustness of the cells by knocking out lytC, sdpC, and skfA in Bacillus subtilis and overcoming the inhibitory effect of a high concentration of hydroquinone. Finally, the engineered strain was used for biotransformation in a 5 L fermenter with batch feeding for 24 h. The final yield of α-arbutin achieved was 129.6 g/L, which may provide a basis for the large-scale industrial production of α-arbutin.
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 16
·47349-47365
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IF 5.8
Geng Xiya,Wei Yu,Geng Wenfeng,Zhang Taifa,Ding Tao,Xu Jixiang,He Huan,Gao Xin,Zhai Jinxia
Deca brominated diphenyl ether (BDE-209) is a widely used flame retardant with endocrine-disrupting activity which reportedly caused sperm quality decline and damaged blood-testis barrier (BTB). However, whether BDE-209 exposure led to BTB integrity dysfunction through affecting microtubule cytoskeletal organization and junctions was not well-elucidated. This study aimed to investigate the role of estrogen receptor α (ERα) in BDE-209-mediated perturbation of BTB integrity. Male rats and primary culture Sertoli cells were co-treated with BDE-209 and propylpyrazoletriol (PPT). The data demonstrated that BDE-209 impaired BTB integrity by reducing crucial tight junction-related proteins with ZO-1 and Occludin. Furthermore, the data suggested that BDE-209 diminished the apical ectoplasmic specialization markers with Eps8 and Formin1. In addition, BDE-209 damaged BTB ultrastructure including tight junctions and ectoplasmic specialization structures with broken tight junctions and the absence of actin microfilaments. Further experiments revealed that ERα was triggered in BDE-209-treated Sertoli cells. Unexpectedly, we found that PPT rescued BDE-209-mediated disruption of BTB integrity including tight junction and apical ectoplasmic specialization by activating ERα in Sertoli cells. Taken together, these findings indicated that intratesticular BDE-209 exposure perturbed BTB integrity and destroyed BTB structure by blocking ERα pathway. Our findings provide a new therapeutic target for male reproductive dysfunction. Graphical Abstract
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PubMed
高影响因子
TENSIDE SURFACTANTS DETERGENTS
·
2022
·Vol. 59
·期 1
·39-50
·
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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高影响因子
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
·
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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PubMed
高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 3
·1727-1737
·
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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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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INDUSTRIAL CROPS AND PRODUCTS
·
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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高影响因子
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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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Dong Wang,Yumeng Wang,Xuefen Wang
In this work, a thorn ball-like three-dimensional (3D) heterostructured ZIF-67@α-MnO 2 catalyst consisting of ZIF-67 nanocages impaled by α-MnO 2 nanorods were robustly embedded in polyacrylonitrile nanofibers by electrospinning technique for highly efficient removal of low-molecular-weight pollutants (LMWPs, like dyes and antibiotics) from wastewater. Benefiting from abundant active sites and enhanced charge transfer abilities provided by ZIF-67@α-MnO 2 nanoparticles, the optimal ZIF-67@α-MnO 2 nanofibrous membranes (NFMs) showed a significant response towards acid fuchsin (AF) in terms of comparable adsorption capacity (2495 mg/g) and impressive catalytic activity (degradation degree of 99 % AF within 20 min). In addition, the resultant membranes possessed satisfactory versatile catalytic activity toward tetracycline (95.3 %), norfloxacin (98.4 %) and doxycycline hyclate (89.2 %). Besides, the resultant membranes had high permeability of 1302 L·m − 2 ·h − 1 driven by gravity and could efficiently treat 370.5 L·m − 2 AF (20 ppm), which was significantly higher than that of pure ZIF-67 NFMs (141.8 L·m − 2 ). The successful fabricating of such membrane with extraordinary adsorption and catalytic performance provided a promising approach for high-performance catalytic membranes.
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高影响因子
FIBERS AND POLYMERS
·
2022
·Vol. 23
·期 8
·2225-2233
·
IF 2.347
Wu Leilei,Bao Xueming,Ren Yiwen,Wang Ping,Zhou Man,Yu Yuanyuan,Wang Qiang
Generally, Bombyx mori silk dyeing is performed using acid dyes. However, the color fastness is always unsatisfactory due to the weak binding forces under neutral conditions. In the present work, graft polymerization of α-lipoic acid (ALA) onto silk fibers was carried out using a two-step method. Briefly, ALA was grafted onto the silk fibers, followed by a reduction-oxidation process to form poly(α-lipoic acid) (PALA) on the fiber surfaces, aiming at improving the electronegativity of fiber surface and realizing cationic dyeing. The results implied that the combined treatments promoted the intermolecular crosslinking between fibroin chains, endowing the silk fiber with low zeta potential simultaneously. A thin sedimentary layer on the fiber surfaces was observed for the PALA-deposited silk fibers, companying with a significant increase in the content of sulfur and O/N ratio, which verified the successful graft polymerization. The modified silk fabric exhibited improved dyeability, and the dyeing depth and color fastness was noticeably higher compared to that of the untreated after cationic dyeing. Meanwhile, the newly-built intermolecular disulfide crosslinks imparted a detectable anti-wrinkle effect to the silk fabric. This study provides a facile strategy for modification of silk fabric with improved dyeing behaviors and physical properties.
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