CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Linlin Huang,Haoyu Zhang,Yanqiong Tan,Wenqin Guo,Jinping Fan,Xiao He,Bo Li,Hongbo Liu,Zhishu Tang,Yue Zhang,Huaxu Zhu
Essential oils (EO) constitute a class of volatile oily liquids with a wide range of applications in pharmaceuticals, foodstuffs, and household chemicals. However, because of their low contents and complex compositions in plants, especially that of some components containing hydrophilic groups that can exist in the form of dissolved oils, their extraction and separation are often difficult. In this study, the membrane-enrichment process of EOs is systematically analyzed by separating nine representative oil/water emulsions used in traditional Chinese medicine using an alumina ceramic (AC) membrane. Owing to the differences in oil content and main component properties of different herbs, AC membranes exhibit different fluxes and oil-rejection rates for different EO emulsion. The highest oil-interception rate, of up to 79.55 %, is exhibited for Eugenia caryophyllata Thunb. (EcT) EO. The droplet size and charge of the emulsions dominate the membrane-separation process. The AC membrane intercepts aldehydes, ketones, and ethers through strong adsorption, whereas highly hydrophobic olefins are intercepted via repulsion. In addition, a carbon layer is coated on the AC membrane to block the contact between alumina and EO components. The specific selective retention of volatile oil components by the AC membrane is verified. The components of EcT EO, enriched by the AC membrane, show 99.4 % similarity to those obtained by traditional steam distillation, while exhibiting comparable antibacterial activity. This study provides new insights into membrane-material design for EO enrichment and offers guidance for matching EOs with suitable membrane materials.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2013
·
IF 2.144
Ruiyong Wang,Xiaohui Kang,Ruiqiang Wang,Rui Wang,Huanjing Dou,Jing Wu,Chuanjun Song,Junbiao Chang
The interactions between trypsin and caffeine/theophylline were investigated by fluorescence spectroscopy , UV–visible absorption spectroscopy , resonance light scattering and synchronous fluorescence spectroscopy under mimic physiological conditions . The results revealed that the fluorescence quenching of trypsin by caffeine and theophylline was the result of the formed complex of caffeine–trypsin and theophylline–trypsin. The binding constants and thermodynamic parameters at three different temperatures were obtained. The hydrophobic interaction was the predominant intermolecular forces to stabilize the complex. Results showed that caffeine was the stronger quencher and bound to trypsin with higher affinity than theophylline .
研究领域:
生物化学
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分子药理学
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药物代谢
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蛋白质-配体相互作用
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光谱学
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DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2012
·Vol. 33
·期 10
·933-937
·
IF 4.596
Fengyang Wang,Lin Cheng,Tianhong Chen,Dongsheng Zhu,Qiang Wen,Shaowu Wang
A straightforward strategy for assembling polymeric dimers from amphiphilic nanoparticles is reported. Amphiphilic polymeric nanoparticles with a mixed-shell of PEO/P2VN blocks and a flexible core of PAA blocks are fabricated by a non-covalent crosslinking method. Uniform polymeric dimers are efficiently and simply obtained via hydrophobic interactions under optimized conditions in selective solvent. The steric hindrance generated by reorganization of hydrophilic polymer brushes during the interparticle association is critical for morphological selectivity in the assembly. General applicability offers the possibility to organize functional NPs into superstructures with well-defined geometry and association numbers.
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Huazhi Aolin,Lanxue Qin,Sihan Zhu,Xialin Hu,Daqiang Yin
The interaction between pharmaceuticals and personal care products (PPCPs) with dissolved organic matter (DOM) can alter their bioavailability and toxicity. Nevertheless, little is known about how pH and DOM work together to affect the availability of PPCPs. This study investigated the impact of pH and DOM on the availability of seven PPCPs, namely Carbamazepine, Estrone, Bisphenol A, Testosterone Propionate, Triclocarban, 4- tert -Octylphenol and 4- n -Nonylphenol, using negligible depletion solid-phase microextraction (nd-SPME). The uptake kinetics of PPCPs by the nd-SPME fibers increased proportionally with DOM concentrations, likely due to enhanced diffusive conductivity in the unstirred water layer. At neutral pH, the partitioning coefficients of PPCPs for Humic Acid (log K DOC 3.87–5.25) were marginally higher than those for Fulvic Acid (log K DOC 3.64–5.11). Also, the log K DOC values correlated linearly with the log D OW (pH 7.0) values of PPCPs, indicating a predominant role for hydrophobic interactions in the binding of DOM and PPCPs. Additionally, specific interactions like hydrogen bonding, π-π, and electrostatic interactions occur for certain compounds, influenced by the polarity and spatial conformation of the compounds. For these ionizable PPCPs, the log D DOC values exhibit a strong dependence on pH due to the dual influence of pH on both DOM and PPCPs. The log D DOC values rose from pH 1.0 to 3.0, peaked at pH 5.0 to 9.0, and then (sharply) declined from 11.0 to 13.0. The reasons are that in strong acidic circumstances, the coiled and compressed shape of DOM inhibits the hydrophobic interaction, whereas in strong alkaline conditions, significant electrostatic repulsion reduces the sorption. This study reveals that the effects of DOM on the bioavailability of PPCPs are dependent on both pH and the specific compound involved.
研究领域:
环境科学
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毒理学
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PubMed
高影响因子
Biosensors-Basel
·
2022
·Vol. 12
·期 10
·881
·
IF 5.743
Pei Dai,Xianzhi Huang,Yaqian Cui,Lihua Zhu
Tetrabromobisphenol A (TBBPA) was one of the most widely used brominated flame retardants. However, it easily contaminates nature and harms the environment and human health during its production and use. Therefore, it is necessary to strictly control the content of TBBPA in electronics. Surface-enhanced Raman spectroscopy has the advantages of being fast and sensitive, but it is difficult to obtain the SERS spectra of TBBPA because the hydrophobic TBBPA molecule is difficult to approach with the hydrophilic surface of common noble metal SERS substrates. In the present work, a hydrophobic Cu-Ag chip was developed for the SERS detection of TBBPA. The integration of the hydrophobic interaction and the Ag-Br bonding promoted the adsorption of TBBPA on the Cu-Ag chip, allowing for SERS detection. It was observed that both the hydrophobicity and bimetallic composition of the Cu-Ag chip played important roles in the SERS detection of TBBPA. Under the optimized conditions, the low limit of detection of the established SERS method for TBBPA was 0.01 mg L−1, within a linear range of 0.1–10 mg L−1. Combined with ultrasonic-assisted extraction, the substrate could be used for the quantitative determination of TBBPA in electronic products. Compared with the HPLC-UV method used as a national standard, the relative error of the SERS method for quantifying the TBBPA content in a mouse cable and shell was ±3% and ±7.7%, respectively. According to the SERS results, the recovery of TBBPA in the spiked mouse shell was 95.6%.Keywords:tetrabromobisphenol A;surface-enhanced Raman scattering;hydrophobic interaction;bi-metal chips;synergistic coupling
研究领域:
分析化学
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环境科学
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材料科学
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PubMed
高影响因子
Soft Matter
·
2019
·Vol. 16
·期 3
·738-746
·
IF 3.399
Baichao Zhang,Chao Wang,Yinchuan Wang,Tao Li,Kankan Zhai,Fan Zhang,Yungang Bai,Ying Tan,Yuqin Ma,Kun Xu,Pixin Wang
To overcome the adverse effects of salt on the mechanical properties of hydrogels, a facile double cross-linking method has been proposed to synthesize salt-enhanced tough hydrogels. Herein, a poly(hexafluorobutyl methacrylate-acrylamide) hydrogel [P(AAm-co-HFBMA) hydrogel] is prepared by the copolymerization of acrylamide (AAm) and hexafluorobutyl methacrylate (HFBMA) with N,N′-methylene bisacrylamide (NMBA) as a cross-linking agent in a dimethylformamide (DMF)/aqueous solution; DMF is then replaced by water. The results indicate that the tensile fracture stress of the P(AAm-co-HFBMA) hydrogel (20 mol% HFBMA) is as high as 0.43 MPa, which is far better than that of the PAAm hydrogel (ca. 30 kPa). Additionally, with a further increase in the hydrophobic structural units (25 mol% HFBMA), the tensile fracture stress of the P(AAm-co-HFBMA) hydrogel can be increased up to 2.34 MPa. The mechanical strength of the P(AAm-co-HFBMA) hydrogel is significantly enhanced to 3.50 MPa (2 M) from 2.34 MPa (0 M) after it is soaked in aqueous NaCl solutions with various salt concentrations. The mechanical properties and the results of the DSC analysis indicate that the main reason for its mechanical strength to exhibit a unique salt-enhancement trend can be explained as follows. After the P(AAm-co-HFBMA) hydrogel is soaked in the salt solution, the network gradually collapses with the penetration of the small molecules of salt. Thus, the hydrophobic C–F units easily form dynamic cross-linking junctions due to the switchable hydrophobic interaction between C–F groups, which can endow the P(AAm-co-HFBMA) hydrogel with a more effective dynamic energy dissipation mechanism in salt solution.
研究领域:
高分子材料
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生物医用材料
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软物质物理
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组织工程
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药物递送系统
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Weirui Zhang,Zhongjie He,Jinliang Xie,Fangfang Su,Yangyang Xin,Dongdong Yao,Mingxiang Li,Yudeng Wang,Yaping Zheng
ABSTRACT The formation of segregated structure has been demonstrated as an effective strategy for achieving exceptional electromagnetic interference (EMI) shielding performance at low filler loadings. However, the acquisition of polymer particles and the formation of interactions with conductive fillers remain significant challenges for polydimethylsiloxane, which are crucial to the construction of a segregated structure. In this work, MXene sheets were functionalized and assembled onto the surface of polydimethylsiloxane microspheres via hydrophobic interaction. Subsequently, functionalized MXene/polydimethylsiloxane (FMP) composites with a segregated structure were fabricated by filtration and hot-pressing. The FMP composite containing 8.22 wt.% MXene exhibited a high electrical conductivity of 99.4 S·m -1 and a satisfactory EMI shielding effectiveness/thickness (EMI SE/d) of 31.3 dB·mm -1 . Furthermore, the FMP composite demonstrated excellent reliability with over 90% retention of EMI shielding effectiveness under harsh environments such as ultra-high/low temperatures and acidic/alkaline solutions. Additionally, the photothermal conversion performance of FMP composites and the capacitive sensing performance of the sensor based on FMP composites indicated their potential for managing body temperature and monitoring human movement. Consequently, FMP composites show great promise in wearable electronics for effective electromagnetic interference shielding, thermal management and capacitive sensing.
研究领域:
材料科学
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电子工程
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高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2017
·
IF 2.536
Sujuan Wang,Xixi Peng,Liangliang Cui,Tongtong Li,Bei Yu,Gang Ma,Xinwu Ba
The potential application of curcumin was heavily limited in biomedicine because of its poor solubility in pure water. To circumvent the detracting feature, two novel water-soluble amino acid modified curcumin derivatives ( MLC and DLC ) have been synthesized through the condensation reaction between curcumin and N α -Fmoc-N ε -Boc- l -lysine. Benefiting from the enhanced solubility of 3.32 × 10 − 2 g/mL for MLC and 4.66 × 10 − 2 g/mL for DLC , the inhibition effects of the as-prepared derivatives on the amyloid fibrillation of lysozyme (HEWL) were investigated detaily in water solution. The obtained results showed that the amyloid fibrillation of HEWL was inhibited to a great extent when the concentrations of MLC and DLC reach to 20.139 mM and 49.622 mM, respectively. The fluorescence quenching upon the addition of curcumin to HEWL provide a support for static and dynamic recombination quenching process. The binding driving force was assigned to classical hydrophobic interaction between curcumin derivatives and HEWL. In addition, UV–Vis absorption and circular dichroism (CD) spectra confirmed the change of the conformation of HEWL.
研究领域:
生物化学
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药物化学
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分子生物学
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DOI
PubMed
高影响因子
Soft Matter
·
2020
·Vol. 16
·期 7
·1840-1849
·
IF 3.14
Lina Ye,Qiong Lv,Xingyue Sun,Yongzhi Liang,Pengwei Fang,Xiaoyou Yuan,Ming Li,Xianzuo Zhang,Xifu Shang,Haiyi Liang
Combining a hydrophobic interaction crosslinked curdlan as the first network and hydrophobic interaction crosslinked polyacrylamide as the second network, we have fabricated a curdlan/HPAAm double network (DN) hydrogel using a one-pot method. The resulting DN hydrogel exhibited good mechanical properties, i.e. an elastic modulus of 103 kPa, a tensile fracture strength of 0.81 MPa, a tensile stretch of 25.3 and a compressive stress of 62.5 MPa when the compressive strain increased up to 99%. The DN gel could withstand ten compression tests under 90% compressive strain without observable damage. The DN gel demonstrated 84% stiffness recovery and 97% toughness recovery after the deformed samples were relaxed and stored at 95 °C for 4 h. The stiffness and fracture stress of the DN gel were enhanced after sterilization treatment at 120 °C. Furthermore, the gels exhibited 52% self-healing of fracture stretch after the samples were cut and brought into contact at 95 °C for 4 h. The self-recovery and self-healing properties of the DN gel both originated from the first curdlan network via the reformation of hydrophobic interactions and the second HPAAm network via reformation of the broken hydrophobic associations.
研究领域:
材料科学
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高分子化学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Kang Ni,Anhong Liu,Yanwei Ding,Xiaodong Ye
Crowded environments, commonly found in the food system, are utilized to enhance the properties of soybean proteins. Despite their widespread application, little information exists regarding the impact of crowded environments on the denaturation behaviors of soybean proteins. In this study, we investigated how crowding agents with varying molecular weights, functional groups, and topology affect the denaturation behavior of glycinin under crowded conditions. The results reveal that thermal stability in PEG crowded environments is mainly influenced by both preferential hydration and binding. The stabilization is primarily enthalpy-driven, with aggregation contributing additional entropic stabilization. Specifically, ethylene glycol and diethylene glycol exhibit temperature-dependent, bilateral effects on glycinin stability. At the denaturation temperature, hydrophobic interactions play a predominant role, decreasing glycinin's thermal stability. However, at a molecular weight of 200 g/mol, there is a delicate balance between destabilizing and stabilizing effects, leading to no significant change in thermal stability. With the addition of PEG 400, 1000, and 2000, besides preferential hydration, additional hard-core repulsions between glycinin molecules enhance thermal stability. Methylation modification experiments demonstrated that 2-methoxyethyl ether exerted a more pronounced denaturing effect. Additionally, the cyclization of PEG 1000 decreased its stabilizing effect.
研究领域:
食品科学
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蛋白质化学
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生物物理学
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DOI
PubMed
高影响因子
ACS Biomaterials Science & Engineering
·
2016
·
IF 0
Hong-Yin Wang,Xian-Wu Hua,Hao-Ran Jia,Chengcheng Li,Fengming Lin,Zhan Chen,Fu-Gen Wu
Because of the distinct surface structures of different cells (mammalian cells, fungi, and bacteria), surface labeling for these cells requires a variety of fluorescent dyes. Besides, fluorescent dyes (especially the commercial ones) for staining Gram-negative bacterial cell walls are still lacking. Herein, a conformation-adjustable glycol chitosan (GC) derivative (GC-PEG cholesterol-FITC) with “all-in-one” property was developed to realize universal imaging for plasma membranes of mammalian cells (via hydrophobic interaction) and cell walls of fungal and bacterial cells (via electrostatic interaction). By comparing the different staining behaviors of GC-PEG cholesterol-FITC and three other analogs (GC-PEG-FITC, GC-FITC, and cholesterol-PEG-FITC), we have elucidated the different roles the hydrophobic and electrostatic interactions play in the staining performance of these different cells. Such a simple, noncytotoxic, economic, and universal cell surface staining reagent will be very useful for investigating cell surface-related biological events and advancing cell surface engineering of various types of cells.
研究领域:
细胞生物学
·
分子生物学
·
微生物学
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DOI
PubMed
Soft Matter
·
2019
·Vol. 15
·期 26
·5264-5270
·
IF 3.399
Houchao Jing,Lin He,Jinyang Feng,Hai Fu,Shuang Guan,Peipei Guo
Hydrogels with multiple shape-memory ability have aroused great interest due to their promising applications in various fields. Nevertheless, the weak mechanical performance of most shape-memory hydrogels seriously impedes the practical application in more complex environments. Herein, we reported a novel hydrogel with both high mechanical and multi-shape memory properties composed of stearyl methacrylate (SMA), acrylic acid (AA) and quaternary chitosan (QCH). The electrostatic interactions between AA and QCH together with the hydrophobic interactions of alkyl chains in SMA endowed the hydrogel with great strain–stress and fatigue resistance. Furthermore, due to the reversible destruction and construction of physical cross-links, the prepared hydrogels also exhibited the shape-memory ability in response to different stimuli, such as temperature, pH and NaCl solution. Additionally, the multiple shape-memory effect could be accomplished via programmable combination because of the relatively independent physical interactions in the hydrogels.
研究领域:
材料科学
·
生物医学工程
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）