JOURNAL OF SURFACTANTS AND DETERGENTS
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2018
·Vol. 22
·期 2
·189-196
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IF 1.454
Han Jia,Pan Huang,Hongyan Wu,An Ma,Hongtao Zhou
It is an urgent issue to enhance oil recovery for unconventional reservoirs with high salinity. Focused on this topic, salt addition is a powerful tool to motivate the surfactant assembly at the water/oil interface and improve the interfacial activity. We used a cationic surfactant cetyltrimethylammonium bromide (CTAB) and an anionic salt dicarboxylic acid sodium (CnDNa) to construct gemini-like surfactants at the interface and evaluated their ability to reduce the interfacial tension (IFT) between model oil (toluene and n-decane, v:v = 1:1) and water. Interestingly, the fabrication of a (CTAB) 2 /C4DNa gemini-like surfactant was hardly achieved at the fresh water/model oil interface, but accomplished at the brine/model oil interface. At a high NaCl concentration (100,000 mg L −1 ), the IFT value is reduced to 10 −3 mN m −1 order of magnitude, which is generally desired in practical applications. The control experiments displacing the surfactant type and the spacer length further confirmed the NaCl effects on the interfacial assembly.
研究领域:
石油工程
·
界面化学
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高影响因子
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
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2017
·Vol. 56
·期 6
·501-508
·
IF 2.838
Sha Wu,Xiangjun Gong,Geoffrey I. N. Waterhouse,Guangzhao Zhang
The effect of monovalent and divalent cations on the ssDNA to dsDNA transformation was systematically examined. For salts containing monovalent cations (LiCl, NaC1, KCl, CsCl), the conversion of ssDNA to dsDNA increased with ionic strength up to a value of I = 0.01 M and then plateaued, confirming that all four of the monovalent cations behaved similarly and promoted the formation of dsDNA. The monovalent cation type influenced the equilibrium constant for the conversion of ssDNA to dsDNA, indicating a degree of ion-specificity in dsDNA formation. In the case of salts containing divalent cations (e.g., MgCl 2 ), the conversion of ssDNA to dsDNA also increased with increasing ionic strength, though the plateau region was reached at a much lower ionic strength ( I = 5.0 × 10 −4 M), which can be attributed to the higher electrostatic screening efficiency of Mg 2+ cations and thus their superior ability to link DNA chains. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018 , 56 , 501–508
研究领域:
生物化学
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分子生物学
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高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Huijing Li,Long Li,Hao Zhang,Junjie Wei,Zhenyu Xu,Tao Chen
To make soft robotics intelligent, dazzling artificial skin and actuators have been created. However, compared to rigid commercial robots, the sophisticated demands of raw materials become a key challenge for autonomous soft actuators to realize manufacturing repeatability and reproducibility. Inspired by the stem cell, which has the potential to differentiate into multifunctional cells with the same original compositions, a potential multifunctional gel is presented. With well-designed polymer chains, the gel has a salt-induced regulating module, conductivity, and other bionic properties. Making use of this advantage, the gel acts as a double-duty electrode for both the actuator and sensor. An artificial reflex arc is therefore formed by their tight integration via an e-brain: a computing unit that specifically responds to organism intervention. This efficient strategy to obtain diverse components with minimal raw materials is promising for effortlessly fabricating fully soft robotics.
研究领域:
材料科学
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生物工程
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机器人学
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PubMed
高影响因子
EUROPEAN BIOPHYSICS JOURNAL WITH BIOPHYSICS LETTERS
·
2017
·Vol. 47
·期 3
·225-236
·
IF 1.472
Li Jie,Xie Yanan,Wang Rui,Fang Zemin,Fang Wei,Zhang Xuecheng,Xiao Yazhong
Laccase (benzenediol: oxygen oxidoreductases, EC1.10.3.2) is a multi-copper oxidase capable of oxidizing a variety of phenolic and other aromatic organic compounds. The catalytic power of laccase makes it an attractive candidate for potential applications in many areas of industry including biodegradation of organic pollutants and synthesis of novel drugs. Most laccases are vulnerable to high salt and have limited applications. However, some laccases are not only tolerant to but also activated by certain concentrations of salt and thus have great application potential. The mechanisms of salt-induced activity enhancement of laccases are unclear as yet. In this study, we used dynamic light scattering, size exclusion chromatography, analytical ultracentrifugation, intrinsic fluorescence emission, circular dichroism, ultraviolet–visible light absorption, and an enzymatic assay to investigate the potential correlation between the structure and activity of the marine-derived laccase, Lac15, whose activity is promoted by low concentrations of NaCl. The results showed that low concentrations of NaCl exert little influence on the protein structure, which was partially folded in the absence of the salt; moreover, the partially folded rather than the fully folded state seemed to be favorable for enzyme activity, and this partially folded state was distinctive from the so-called ‘molten globule’ occasionally observed in active enzymes. More data indicated that salt might promote laccase activity through mechanisms involving perturbation of specific local sites rather than a change in global structure. Potential binding sites for chloride ions and their roles in enzyme activity promotion are proposed.
研究领域:
生物化学
·
酶学
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PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
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2015
·
IF 2.729
Huili Wang,Ming Gao,Mei Wang,Rongbo Zhang,Wenwei Wang,Randy A. Dahlgren,Xuedong Wang
Herein, we developed a novel integrated device to perform phase separation based on ultrasound-assisted salt-induced liquid–liquid microextraction for determination of five fluoroquinones (FQs) in human body fluids. The integrated device consisted of three simple HDPE components used to separate the extraction solvent from the aqueous phase prior to retrieving the extractant. A series of extraction parameters were optimized using the response surface method based on central composite design. Optimal conditions consisted of 945 μL acetone extraction solvent, pH 2.1, 4.1 min stir time, 5.9 g Na 2 SO 4 , and 4.0 min centrifugation . Under optimized conditions, the limits of detection (at S/N = 3) were 0.12–0.66 μg L −1 , the linear range was 0.5–500 μg L −1 and recoveries were 92.6–110.9% for the five FQs extracted from plasma and urine. The proposed method has several advantages, such as easy construction from inexpensive materials, high extraction efficiency, short extraction time, and compatibility with HPLC analysis. Thus, this method shows excellent prospects for sample pretreatment and analysis of FQs in human body fluids.
研究领域:
分析化学
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药物分析
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医学检测
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PubMed
高影响因子
JOURNAL OF SEPARATION SCIENCE
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2023
·Vol. 46
·期 20
·2300426
·
IF 3.1
Mincong Liu,Si Huang,Linli Tan,Jiaxin Pan,Shuting Xie,Han Zuilhof,Bo Chen,Ming Ma
As acetonitrile is a widely used solvent for the chemical industry, the recovery of acetonitrile from acetonitrile wastewater is significant for both industrial cost reduction and environmental protection. In this article, a simple, low-energy, and low-cost strategy is proposed for the effective separation of acetonitrile from high-concentration acetonitrile wastewater. The approach is based on a sequential combination of two steps: salt-induced phase separation and hydrophobic filtration. The acetonitrile wastewater was first induced to split into two phases by salt, that is, the acetonitrile-rich phase and the water-rich phase, then the above two phases were poured into the hydrophobic filter paper funnel for the separation. It was shown that NaCl is a suitable salting-out reagent, and that hydrophobic filter papers—obtained from modification by butyltrichlorosilane and octyltrichlorosilane were the optimal choice for hydrophobic filtration. The salt-induced phase separation process is able to increase the volume fraction of acetonitrile in the acetonitrile-rich phase up to 92%. The acetonitrile-rich phase can pass through the hydrophobic filter paper, whereas the water-rich phase was intercepted. The hydrophobic filter paper retained strong hydrophobicity and high acetonitrile-separating capacity after 3 months storage, or upon immersion in acetonitrile-water mixtures for 12 h, or applied for 25 consecutive separations.
研究领域:
环境科学
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化学工程
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PubMed
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2024
·
IF 5.5
Chengling Bai,Zhengyang Gu,Ping Li,Rongsheng Ning,Shuili Yu
Background Municipal drinking water treatment demands nanofiltration (NF) membranes with high removal efficiency for organics, high passage for mineral ions, and low operating pressure. The development of innovative and loose NF membranes is imperative. Methods A loose-network-structured NF membrane (L-NF) was synthesized through interfacial polymerization (IP) on a PES substrate by utilizing lysine (with a flexible aliphatic chain) as standalone aqueous phase monomers. The separation performance for typical organics and mineral ions in water, as well as the permeability of the membrane were investigated. Significant findings The lysine-based NF membranes exhibit a reversible and appropriate salt-induced swelling effect. The increased salt concentration leads to a significant enhancement of both permeate flux and salt passage, while maintaining unaffected removal efficiency for organics. The optimized membrane (L-NF3), synthesized with a 1 % (w/v) concentration of lysine, demonstrated remarkable retention (>98 %) for organics (humic acid and sodium alginate), while concurrently displaying low retention (5.22 %-16.40 %) for mineral ions (Mg 2+ / Ca 2+ ). Furthermore, the salts in the feed led to a substantial improvement in permeate flux (239.61 %-385.70 %) compared to salt-free feed. The Lys-TFC membrane showcased outstanding performance of separation, permeability, and operational stability, underscoring its significant potential in municipal drinking water purification.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
MEAT SCIENCE
·
2015
·
IF 2.615
Huili Wang,Ming Gao,Youqu Xu,Wenwei Wang,Lian Zheng,Randy A. Dahlgren,Xuedong Wang
Herein, we developed a novel integrated device to perform phase separation based on ultrasound-assisted, salt-induced, liquid–liquid microextraction for determination of five fluoroquinones in meats by HPLC analysis. The novel integrated device consisted of three simple HDPE (high density polyethylene) parts that were used to separate the solvent from the aqueous solution prior to retrieving the extractant. The extraction parameters were optimized using the response surface method based on central composite design: 589 μL of acetone solvent, pH 2.1, 4.1 min extraction time and 3.5 g of Na 2 SO 4 . The limits of detection were 0.056–0.64 μg kg − 1 and recoveries were 87.2–110.6% for the five fluoroquinones in muscle tissue from fish, chicken, pork and beef. This method is easily constructed from inexpensive materials, extraction efficiency is high, and the approach is compatible with HPLC analysis. Thus, it has excellent prospects for sample pre-treatment and analysis of fluoroquinones in meat samples.
研究领域:
分析化学
·
食品科学
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DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2014
·
IF 3.259
Ming Gao,Huili Wang,Meiping Ma,Yuna Zhang,Xiaohan Yin,Randy A. Dahlgren,Dongli Du,Xuedong Wang
Herein, we developed a novel integrated apparatus to perform phase separation based on magnetic-stirring, salt-induced, liquid–liquid microextraction for determination of five fluoroquinolones in animal-based foods by HPLC analysis. The novel integrated apparatus consisted of three simple HDPE (high density polyethylene) parts that were used to separate the solvent from the aqueous solution prior to retrieving the extractant. The extraction parameters were optimized using the response surface method based on central composite design: 791 μL of acetone solvent, 2.5 g of Na 2 SO 4 , pH 1.7, 3.0 min of stir time, and 5.5 min centrifugation. The limits of detection were 0.07–0.53 μg kg −1 and recoveries were 91.6–105.0% for the five fluoroquinolones from milk, eggs and honey. This method is easily constructed from inexpensive materials, extraction efficiency is high, and the approach is compatible with HPLC analysis. Thus, it has excellent prospects for sample pre-treatment and analysis of fluoroquinolones in animal-based foods.
研究领域:
分析化学
·
食品安全
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DOI
PubMed
高影响因子
ULTRASONICS SONOCHEMISTRY
·
2024
·
IF 8.7
Dan Zheng,Danrong Yu,Shuai Lin,Liting Ji,Yaogui Sun,Chunyou Liu,Xiaoyu Zhang,Zhihui Yu
Salted duck eggs are a popular food product, but their high salt content and uneven salt distribution can reduce acceptability. This study investigated the effects of pH-high-intensity ultrasound combined treatment on the salt-induced gelation properties of egg yolk granules. The results showed that the pH5 + 150 W treatment group exhibited the best physical and gelation properties, with the smallest particle size (1597.33 nm), optimal dispersibility (PDI 0.29), and good stability. The gelation properties of this group also demonstrated excellent springiness (0.30 mm), cohesiveness (0.56), and gumminess (0.05 N). Furthermore, the pH5 + 150 W group had the highest water holding capacity of 97.42 % and relatively high hydrophobicity (173.39 μg). Notably, it also showed high oil exudation (2.83 %) and good sandiness (62.07 %). The pH5 + 150 W led to a significant redshift of the fluorescence peak at 335 nm and an enhancement of the peak intensity at 562 nm compared to the control group. Structural characterization revealed a more ordered protein structure and a uniform gel structure with enhanced electrostatic repulsion between oil droplets. Secondary structure analysis of the proteins showed a significant reduction in α-helix and β-sheet, while β-turn and random coil increased. In summary, the pH5 + 150 W treatment displayed the best gelation properties, providing theoretical guidance for enhancing the processing performance of yolk and expanding their application in the food industry.
研究领域:
食品科学
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生物化学
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DOI
PubMed
高影响因子
Polymers
·
2018
·Vol. 10
·期 11
·1215
·
IF 2.935
Wenlong Zhang,Jincheng Mao,Xiaojiang Yang,Heng Zhang,Zhaoyang Zhang,Bo Yang,Yang Zhang,Jinzhou Zhao
Gemini surfactant, as a functionally flexible polymer-like material in the aqueous solution, has attracted increased attention in reservoir stimulation of hydraulic fracturing in recent decades. A new Gemini cationic viscoelastic surfactant named JS-N-JS, which has a secondary amine spacer group and two ultra-long hydrophobic tails, was synthesized from erucamidopropyl dimethylamine, diethanolamine, and thionyl chloride as a thickener for hydraulic fracturing fluid. Compared with some Gemini cationic surfactant with methylene spacer, JS-N-JS showed a lower critical micellar concentration (CMC) and higher surface activity due to the hydrogen bond formed between the secondary amine and water molecule intends to reduce electrostatic repulsion, which is more beneficial to be the fracturing fluid thickener. Moreover, the performance of JS-N-JS solution can be further improved by salts of potassium chloride (KCl) or sodium salicylate (NaSal), while organic salt behaved better according to the measurements. The SEM observation confirmed that JS-N-JS/NaSal system owned a tighter network microstructure, and JS-N-JS/NaSal system exhibited a distinct superior viscoelasticity system at a sweep frequency of 0.1–10 Hz. As a fracturing fluid, the solution with a formula of 30 mmol JS-N-JS and 100 mmol NaSal was evaluated according to the petroleum industrial standard and presented excellent viscoelastic properties, the viscosity of which can maintain above 70 mPa·s for 110 min under a shear rate of 170 s−1at 120 °C. Meanwhile, the drag reducing rate of the formula could reach above 70% with the increase of shear rate. Finally, the viscous fracturing fluid can be broken into the water-like fluid in 1.2 h after being fully exposed to hydrocarbons and the water-like fluid presented a low damage to the tight sand reservoirs according to the core flooding experiments, in which the permeability recovery rate can reach 85.05%. These results fully demonstrate that the JS-N-JS solution fully meets the requirement of the industrial application of hydraulic fracturing.Keywords:Gemini cationic surfactant;salt-induced;wormlike micelles;viscoelasticity;clean fracturing fluid
研究领域:
化学工程
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石油工程
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PubMed
高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 10
·1-7
·
IF 5.705
Kong Caiyun,Gao Linna,Chen Zhengbo
An aptamer based assay is described for the colorimetric detection of adenosine. The presence of adenosine triggers the deformation of hairpin DNA oligonucleotide (HP1) containing adenosine aptamer and then hybridizes another unlabeled hairpin DNA oligonucleotide (HP2). This leads to the formation of a double strand with a blunt 3′ terminal. After exonuclease III (Exo III)-assisted degradation, the guanine-rich strand (GRS) is released from HP2. Hence, the adenosine-HP1 complex is released to the solution where it can hybridize another HP2 and initiate many cycles of the digestion reaction with the assistance of Exo III. This leads to the generation of a large number of GRS strands after multiple cycles. The GRS stabilize the red AuNPs against aggregation in the presence of potassium ions. If, however, GRS forms a G-quadruplex, it loses its ability to protect gold nanoparticles (AuNPs) from salt-induced AuNP aggregation. Therefore, the color of the solution changes from red to blue which can be visually observed. This colorimetric assay has a 0.13 nM detection limit and a wide linear range that extends from 5 nM to 1 μM.
Schematic presentation of a colorimetric aptamer biosensor for adenosine detection based on DNA cycling amplification and salt-induced aggregation of gold nanoparticles.
研究领域:
分析化学
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生物传感器
·
纳米技术
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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）