CELLULOSE
·
2020
·Vol. 27
·期 17
·10541-10551
·
IF 4.21
Wang Mingyue,Liu Mao,Zhao Hongjuan,Xiong Xiaoqing,Zheng Laijiu
Abstract Modified curcumin, which has the advantages of low toxicity, high solubility, and little color change after modification, is very suitable for nonaqueous supercritical carbon dioxide cotton dyeing. However, the existing curcumin modification technology focuses on improving its solubility. Modified curcumin is directly adsorbed onto cotton fabrics, and the main interaction forces are van der Waals forces, which causes the poor fastness of modified curcumin to dyed cotton fabrics. In this study, reactive groups (hydroxyalkyls) were introduced into curcumin to enhance its fastness to cotton fabrics. The results showed that, similar to alkyl groups, hydroxyalkyl groups can enhance the color depth of dyed cotton fabrics by elevating the solubility of modified curcumin in supercritical carbon dioxide. The higher the solubility of modified curcumin in supercritical carbon dioxide was, the higher the K/S value of the dyed cotton fabric. Furthermore, the hydroxyl groups on the modified curcumin could form ether bonds with the hydroxyl groups on cotton fabrics. Therefore, the washing and rubbing fastness of hydroxyalkyl-curcumin-dyed cotton fabric was better than that of alkyl-curcumin-dyed cotton fabric. Graphic abstract
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高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 2
·1-11
·
IF 6.232
Tan Wangming,Chen Ye,Xiong Xiyue,Huang Si,Fang Zhengfa,Chen Yingzhuang,Ma Ming,Chen Bo
An in-situ approach is described for synthesis of poly(sulfobetaine-co-polyhedral oligomeric silsesquioxane) [poly(sulfobetaine-co-POSS)] that can be used in a hybrid monolithic column as a hydrophilic liquid chromatography (HILIC) stationary phase. Synthesis involves (a) radical polymerization of octa(propyl methacrylate)-polyhedral oligomeric silsesquioxane (MA-POSS) and organic monomers such as dimethylaminopropyl methacrylate or vinyl imidazole, and (b) in-situ ring-opening quaternization between 1,4-butane sultone and the organic monomers. The sulfobetaine groups are generated in-situ monolith. This obviates the need for synthesis of sulfobetaine monomer previously. The pore size and permeability of the material can be tuned by using a binary porogenic system (polyethyleneglycol 600 and acetonitrile) and via the composition of the polymerization mixture. The optimized hybrid monolith owns its merits to the presence of POSS and sulfobetaine groups with good mechanical stability, the lack of residual silanol groups, and adequate hydrophilicity. The column filled with the monoliths was evaluated as a stationary phase for HILIC. Several kinds of polar compounds (including nucleosides, bases, phenols, aromatic acids and amides) were separated by using mobile phases with high organic solvent fractions in capillary liquid chromatography.
An in-situ approach is described for synthesis of poly(sulfobetaine-co-polyhedral oligomeric silsesquioxane) hybrid monolithic column for use in hydrophilic liquid chromatography. The optimized monolith owns good mechanical stability, the lack of residual silanol groups and adequate hydrophilicity. Baseline separation of several kinds of polar compounds is achieved on the column. MA-POSS: octa(propyl-methacrylate) polyhedral oligomeric silsesquioxane; DMAEMA: dimethylaminoethyl methacrylate; AIBN: azodiisobutyronitrile. Poly(DMABS-co-POSS): poly( N -(4-sulfobutyl)- N -methacryloxypropyl- N,N -dimethylammonium-betaine-co-polyhedral oligomeric silsesquioxane).
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高影响因子
Frontiers of Environmental Science & Engineering
·
2022
·Vol. 16
·期 10
·1-12
·
IF 6.048
Liang Jinhui,Luo Yuchen,Li Benhang,Liu Shiqi,Yang Liansheng,Gao Peng,Feng Li,Liu Yongze,Du Ziwen,Zhang Liqiu
Progesterones are ubiquitous in hospital wastewater (HWW) with concentrations much higher than those of estrogens and androgens. To ensure that these water systems are safe to use, disinfection is crucial during HWW treatment by providing “front line” defense against biological contaminations. Here, five disinfection processes, namely, chlorine (Cl 2 ), chlorine dioxide (ClO 2 ), ozone (O 3 ), ultraviolet (UV)), and UV/chlorine (UV/Cl 2 ), were selected to investigate their removal efficiencies for progesterones in primary filtration and secondary biological treatment effluents. There were 61 natural and synthetic progesterones detected in HWW, with the natural progesterones being the main components with a concentration of 845.51 ng/L and contributing to 75.08% of the total progesterones. The primary filtration treatment presented insignificant removal effects on the progesterones, while the secondary biological treatment significantly reduced the progesterone content by biodegradation. The order of removal efficiencies of total progesterones by different disinfection processes was UV/Cl 2 > Cl 2 > O 3 > ClO 2 > UV. UV/Cl 2 showed the highest removal efficiency against progesterones mainly due to the activation of Cl 2 by ultraviolet (UV) photolysis, which helps open the heterocyclic, aromatic, and phenolic rings, thus accelerating progesterone degradation. In addition, the removal efficiencies of natural progesterones in the five disinfection processes were higher than those of synthetic progesterones (progesterone derivatives, 19-nortestosterone derivatives, and 17α-hydroxyprogesterone derivatives).
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高影响因子
MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 8
·1-11
·
IF 6.408
Lu Juan,Shan Xiangyu,Wu Qian,Sun Zhuo,Zhang Xin,Zhao Yingjie,Tian Li
A novel solid-state electrochemiluminescence (ECL) sensor for chlorpyrifos (CPF) detection was constructed based on zeolitic imidazolate framework-67 electrospinning nanofibers (ZIF-67 NFs). Silver nanoparticles (Ag NPs), ZIF-67 NFs, tris(2,2′-bipyridyl) ruthenium(II) [Ru(bpy) 3 2+ ], and Nafion were successively deposited on the surface of the electrode. Ag NPs played a role in promoting electron transfer, and ZIF-67 NFs played a role in fixing Ru(bpy) 3 2+ and promoting electron transfer due to its large specific surface area and porosity. Nafion formed a film on the outermost layer of the electrode to further improve the stability of the system. Therefore, the modified electrode showed stable and obvious ECL signal in PBS solution containing 10 μL 0.01 M TprA (pH 8.0). CPF quenched the ECL signal of the system, and the quenching value was linear with the logarithm of CPF concentration in the range 1.0 × 10 −13 to 1.0 × 10 −6 M. The detection limit was 3.3 × 10 −14 M (S/N = 3). In this study, ZIF-67 NFs were used as an ECL promoter for the first time, broadening the application range of ZIF-67 NFs. Graphical abstract
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高影响因子
Frontiers of Environmental Science & Engineering
·
2024
·Vol. 18
·期 7
·1-14
·
IF 6.1
He Qian,Gao Junkai,Chen Zhongzhi,Ding Yuanjing,Xia Mengsheng,Xu Pengtao,Chen Yan
To avoid resource wastage and secondary environmental pollution, recycling and reusing waste wood powder is still a great challenge. Moreover, the poor viscosity and irregular pore size of wood powder limit its practical application. This study employed a green and convenient wood powder reconstitution strategy to achieve highly adhesive bonding and pore size control between wood powder particles, thus preparing a high-strength and super hydrophilic wood powder membrane. The wood powder fibers were partially dissolved and regenerated to create a reconstituted wood powder hydrogel membrane, using waste wood powder as the raw material. The wood powder reconstitution strategy offers advantages such as environmental friendliness, simplicity, cost-effectiveness, and strong universality. Furthermore, the materials exhibit excellent self-cleaning properties and superhydrophilicity. Driven by gravity, the membrane can purify oily wastewater and dyes. Additionally, the reconstitution strategy offers a new pathway for recycling wood powder.
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高影响因子
Chemistry Africa-A Journal of the Tunisian Chemical Society
·
2022
·Vol. 5
·期 3
·663-672
·
IF 0
Maharana Subhashini,Mangaonkar Kiran,Phanse Manjusha
The demand for herbal raw material has increased and there is a requirement for quality control to look at the integrity of the herbal raw materials. There is a need for an easy and fast technique to check the quality and the authenticity of these raw materials. Nelumbo nucifera seeds have been used as traditional medicine for ages for curing various diseases. Its microscopy examination of fruit showed double-layered palisade tissue, rosette scleride, and epidermal pores. The morphology of starch grains were found to be simple, oval, and elliptical to polygonal in shape, which is the unique characteristic of the plant. Phytochemical analysis showed the presence of alkaloids, flavonoids, tannins, phenols, and saponin. A comparative study of cold and hot extraction of seed extract was carried out with respect to the HPTLC fingerprint profile. The HPTLC fingerprint of the cold and hot extract was done using butanol: water: acetic acid (4:1:1v/v/v) it showed the presence of 9 bands (R F 0.05–0.94) on the plate. The result shows that both cold and hot extract can be used for fingerprinting. Different concentrations of cold extract (100%, 80%, 50%, 20%) was used to standardize the lowest on plate concentration which can give maximum bands with high resolution, the results shows that a lower concentration of 50% can be used for the study. Thus, microscopy and HPTLC fingerprinting data along with morphological information can be used as a quality control tool to check the authenticity of the Nelumbo nucifera which has potential therapeutic value.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 23
·21693-21701
·
IF 2.22
Zhou Fuming,Wang Hao,Guo Jianming,Yang Hui,Li LingFeng,Zhang Qilong
Microwave dielectric ceramics Sr 2 CeO 4 + n wt% Li 2 CO 3 —Bi 2 O 3 (LB) (1 ≤ n ≤ 4, L: B = x : y , weight ratio) were prepared by a traditional solid-state reaction method. The effects of LB additives on the phase formation, microstructure, sintering behavior, and microwave dielectric properties of Sr 2 CeO 4 ceramics were investigated. The sintering temperature can be reduced obviously from 1270 to 950 °C because of the liquid phase formation of LB. Single-phase Sr 2 CeO 4 ceramics with dense structure and homogenous grains were obtained by adding 1wt% LB. With LB content increasing, Q × f values would decrease because secondary-phase SrCeO 3 appeared in the ceramics. When the content of LB was fixed at 1 wt%, the sintering temperature and Q × f value would decrease simultaneously with the ratio of Li 2 CO 3 increasing. Desirable performances of Sr 2 CeO 4 + 1wt% LB ceramics: ( ε r = 14.36, Q × f = 102,023 GHz and τ f = − 66.42 ppm/°C, L:B = 2:8) and ( ε r = 13.56, Q × f = 70,109 GHz, τ f = − 64.17 ppm/°C, L:B = 8:2) can be achieved at 1075 °C and 950 °C, respectively, suggesting that Sr 2 CeO 4 –LB ceramics have a great potential for millimeter-wave applications.
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高影响因子
COLLOID AND POLYMER SCIENCE
·
2021
·Vol. 299
·期 9
·1489-1498
·
IF 1.931
Yu Caili,Yan Chengfei,Shao Jintao,Zhang Faai
Green renewable resource has become a global hot spot. In this study, naturally occurring resource rosin derivative (RAG) was used to prepared a cationic waterborne polyurethane (WPU) dispersion using n-methyl di-ethanolamine (MDEA) as an ion center and 1,3-bis(3-aminopropyl) tetramethydisiloxane (APTMDS) as a chain extender, and hexamethylene diisocyanate (HDI) as a hard segment. The effects of MDEA and APTMDS contents on the particle size and storage stability of the WPU dispersion was determined, in addition, thermo-mechanical and mechanical properties, and antibacterial property as well as water uptake of the resulting polyurethane films were thoroughly investigated. The results show that an increase in the APTMDS content considerably improved the mechanical properties, surface hydrophobicity and water resistance of the WPU films. Moreover, all WPU films exhibit enhanced antibacterial activity against Escherichia coli and Staphylococcus aureus with the increase in the MDEA and APTMDS contents. Graphical abstract
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高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 7
·1-11
·
IF 5.479
Xing Xinxin,Yang Yue,Zou Tong,Wang Zhezhe,Wang Zidong,Zhao Rongjun,Zhang Xu,Wang Yude
Thioglycolic acid-functionalized ZnSe quantum dots (QDs) as a colorimetric nanoprobe were prepared and applied to the determination of cobalt(II) and iron(III). Test strips were obtained by a dipping-drying process. On exposure to Co(II), they undergo a color change from white to brown, and on exposure to Fe(III) from white to pink. The limits of detection (LOD) are 2.6 mg L −1 for Co(II) and 2.2 mg L −1 for Fe(III). Test strips introduce a low-cost, portable, rapid and convenient tool for determination of Co(II) and Fe(III). In addition, two other analytical methods have been studied for detection of Co(II) and Fe(III) at low concentration. The first is UV-vis spectrometry which has a LOD as low as 0.14 mg L −1 for Co(II) (at 412 nm) and 0.12 mg L −1 for Fe(III) (at 400 nm). The second is dynamic light scattering (DLS) with a LOD of 3.0 μg L −1 for Co(II) and 2.5 μg L −1 for Fe(III).
Thioglycolic acid-functionalized ZnSe quantum dots (TGA-ZnSe QDs) show high sensitivity and low detection limits for Co 2+ and Fe 3+ .
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高影响因子
RARE METALS
·
2022
·Vol. 41
·期 12
·4055-4064
·
IF 6.318
Li Hao-Xiang,Zhu Jia-Hui,Huang Xiao-Bing,Zhou Tao,Ren Yu-Rong
The extremely low electrical conductivity and ion-diffusion coefficient of Li 2 FeSiO 4 limits its application as a cathode material in lithium-ion batteries. Therefore, in situ boron-doped Li 2 FeSi 1− x B x O 4− δ /C ( x = 0, 0.01, 0.03, 0.05 and 0.07) at the Si site was prepared via the solid-state reaction method using pitch as the carbon source. B doping in the lattice structure and a carbon coating on the surface of the composites could effectively enhance the Li + /electron conductivity. Moreover, the reduced particle size of the active material with the relatively high specific area via boron-doped modification could improve the wettability between the electrolyte and cathode. With the synergistic effect of appropriate boron doping and carbon coating, it exhibits a good rate performance, specific capacity, and cycling performance. As a result, the as-prepared Li 2 FeSi 0.95 B 0.05 O 4− δ /C cathode showed a high discharge capacity of 160.7 mAh·g −1 at 0.2C, and the capacity retention rate was 96% after 100 cycles at 1.0C. This work presents an effective path for designing advanced cathode materials for lithium-ion batteries. Graphical abstract
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高影响因子
Journal of Ovarian Research
·
2024
·Vol. 17
·期 1
·1-12
·
IF 3.8
Liu Wen-Jiao,Li Li-Shu,Lan Meng-Fan,Shang Jian-Zhou,Zhang Jin-Xin,Xiong Wen-Jie,Lai Xin-Le,Duan Xing
Zinc (Zn) is a crucial trace element essential for human growth and development, particularly for reproductive health. Previous research has shown a decrease in serum zinc concentration with age and individuals with conditions such as polycystic ovary syndrome (PCOS) and diabetes mellitus. However, the specific effects of zinc deficiency on the female reproductive system, especially ovarian function, are not fully understood. In our study, we observed a significant reduction in the total number of follicles and mature follicles in the zinc deficiency group. This reduction correlated with decreased level of anti-Mullerian hormone (AMH) and abnormal gene expression affecting hormone secretion regulation. Furthermore, we found that zinc deficiency disrupted mitochondrial dynamics, leading to oxidative stress in the ovaries, which further inhibited autophagy and increased ovarian apoptosis. These changes ultimately resulted in the failure of germinal vesicle breakdown (GVBD) and reduced oocyte quality. Meanwhile, administration of zinc glycine effectively alleviated the oocyte meiotic arrest caused by dietary zinc deficiency. In conclusion, our findings demonstrated that dietary zinc deficiency can affect hormone secretion and follicle maturation by impairing mitochondrial function and autophagy.
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高影响因子
Nano Research
·
2024
·
IF 9.5
Zhu Shengjie,Huang Danqing,Luan Qichen,Li Yang,Gan Jingjing,Zhao Yuanjin,Sun Lingyun
Macrophages play a pivotal role in systemic lupus erythematosus (SLE) therapy. Efforts have been made to develop multifunctional drug delivery systems capable of directing macrophage polarization. Here, we present a novel hyaluronic acid methacrylate (HAMA) hydrogel microparticle encapsulating multiple cytokines for SLE remission though enhancing macrophage functions. The HAMA microparticles loaded with monocyte chemotactic protein-1 (MCP-1) and interleukin-4 (IL-4) were fabricated by using a microfluidic technology. The released MCP-1 facilitates the aggregation of inflammatory macrophages, after which IL-4 induces the macrophage phenotype shift from inflammatory M1 to immune-protective M2, thus restoring immune balance. We have demonstrated in MRL/lpr mice that the hydrogel microparticles could improve their efficacy of intraperitoneal drug delivery, modulate immune function, and attenuate the disease symptoms. These results suggest that our proposed microparticles delivery platform has potential clinical value for treating autoimmune diseases.
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高影响因子
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