INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
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IF 4.2
Peng Wang,Sultan Ahmed Khoso,Zhao Cao
The self-assembly of mixed surfactants at the air/water interface plays a crucial role in mineral flotation separation. This study aimed to investigate the molecular arrangement and synergistic adsorption of mixed surfactants at the air/water interface using molecular dynamics (MD) simulation and surface tension measurement. The stability of mixed surfactant solutions was also measured using dynamic light scattering and ζ potential. We investigated the mixture of octylhydroxamic acid (OHA) and dodecanol (DOD) surfactants at different weight ratios. The surface activity of the OHA/DOD mixture was characterized in detail, including the relative concentration distribution, structural properties, and radial distribution function. The MD simulations revealed that OHA/DOD was inserted into the water as a headgroup at the air/water interface, and the carbon chain extended into the air. A strong synergistic effect was observed between the two surfactants, and a dense monolayer film was formed at the air/water interface, demonstrating higher surface activity. With an increase in the DOD ratio, the hydrogen bond between the OHA headgroup and water molecules became stronger. The order of surface activity of the mixture was OHA:DOD = 1:1 > OHA:DOD = 2:1 > OHA:DOD = 4:1. In the temperature range from 24 to 30 °C, the surface tension decreased and the critical micelle concentration increased with increasing temperature. The addition of DOD changed the conformation of the mixed surfactants, which was beneficial to the aggregation of OHA/DOD complexes. When OHA:DOD = 1:1, the average particle size was the largest and the formed micelles were the most stable. The experimental results are consistent with the surface tension and simulation results.
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高影响因子
EUROPEAN FOOD RESEARCH AND TECHNOLOGY
·
2023
·Vol. 249
·期 7
·1749-1759
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IF 3.3
Liu Ying,Liu Xin,Gao Ying,Dong Shijian,Xiang Xiaole,Ma Lulu,Li Shugang
Egg white powder (EWP) is a kind of food processing ingredient with high quality, low price and superior processing performance. However, its application in food industry is seriously affected by the problems such as strong off-flavor and its unknown volatile compounds. In this study, EWP was taken as the research object, and the off-flavor difference of EWP under different drying methods (spray drying, vacuum drying and freeze drying) was taken as the breakthrough point. With the help of gas chromatograph-mass spectrometer (GC–MS), electronic nose (E-nose) and sensory evaluation, it was found that the off-flavor of EWP was described as fishy and green, and high temperatures made the off-flavor worse, especially SD-EWP presented the strongest odor. A total of 13 key flavor compounds and 7 potential off-flavor compounds in SD-EWP were identified by gas chromatograph–mass spectrometer–olfactometry (GC-MS-O) and aroma reconstruction experiments. The relationship model of key flavor compounds, E-nose and off-flavor was established by multivariate analysis. It was verified that octanal, nonanal, 1-octen-3-ol and geranyl acetone were the off-flavor compounds of EWP. This study provided theoretical guidance and technical reference for the flavor research and sensory quality improvement of EWP.
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ACS Applied Materials & Interfaces
·
2023
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IF 9.5
Shuang Tao,Jingtian Han,Ying Xu,Zhenggang Fang,Yaru Ni,Liang Fang,Chunhua Lu,Zhongzi Xu
Energy consumption during cooling and heating poses a great threat to the development of society. Thermal regulation, as switchable cooling and heating in a single platform, is therefore urgently demanded. Herein, a switchable multifunctional device integrating heating, cooling, and latent energy storage was proposed for temperature regulation and window energy saving for buildings. A radiative cooling (RC) emitter, a phase-change (PC) membrane, and a solar-heating (SH) film were connected layer by layer to form a sandwich structure. The RC emitter exhibited selective infrared emission (emissivity in the atmospheric window: 0.81, emissivity outside the atmospheric window: 0.39) and a high solar reflectance (0.92). Meanwhile, the SH film had a high solar absorptivity (0.90). More importantly, both the RC emitter and the SH film displayed excellent wear resistance and UV resistance. The PC layer can control the temperature at a steady state under dynamic weather conditions, which could be verified by indoor and outdoor measurements. The thermal regulation performance of the multifunctional device was also verified by outdoor measurements. The temperature difference between the RC and SH models of the multifunctional device could reach up to 25 °C. The as-constructed switchable multifunctional device is a promising candidate for alleviating the cooling and heating energy consumption and realizing energy saving for windows.
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高影响因子
POLYMER
·
2022
·
IF 4.432
Shicong Jia,Hongwei Wang,Ruizhi Tang,Shujuan Ma,Bolin Gong,Junjie Ou
At present, most of Janus particle with different shapes were synthesized via seeded emulsion thermal-initiated polymerization. Herein, a novel and simple strategy of seed-swelling photoinitiated polymerization was proposed to fabricate Janus particles, in which noncrosslinked polystyrene seed was swelled via absorbing an oil phase consisting of glycidyl methacrylate (GMA) as functional monomer , dipentaerythritol pentaacrylate (DPEPA) as crosslinker and different organic solvents . Several parameters such as molar ratio of monomer and crosslinker, irradiation time of UV light, the types of porogenic reagents and the composition of aqueous phase were investigated. Numerous liquid droplets merged into multiple protrusions, and further immobilized onto the surface of seed particle. Subsequently, half raspberry-like particle was finally generated with low molar ratio of monomer and crosslinker, while both dumbbell-like and egg-like Janus particles were acquired in higher molar ratio of monomer and crosslinker. These Janus particles were synthesized via “green” process owning to fast and simple characters. After modification via surface-initiated atom transfer radical polymerization (SI-ATRP) and amination, the as-synthesized Janus@polyAN-TEPA was utilized in the adsorption of Cu (Ⅱ) ion and the maximum adsorption reached 132 mg g −1 . As a result, the Janus particles demonstrated excellent capacity on absorption of Cu (Ⅱ) ion, and it is promising to utilize the Janus particle in the fields of separation and enrichment.
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Frontiers in Microbiology
·
2023
·
IF 5.2
Song Wei,Xin Jiaying,Yu Chong,Xia Chungu,Pan Yu
Ferulic acid (FA) is a natural antibacterial agent rich in plants, FA has excellent antioxidant and antibacterial properties. However, because of its short alkane chain and large polarity, FA is difficult to penetrate the soluble lipid bilayer in the biofilm to enter the cell to play an inhibitory role, limiting its biological activity. To improve the antibacterial activity of FA, with the catalytic condition of Novozym 435, four alkyl ferulic acid esters (FCs) with different alkyl chain lengths were obtained by fatty alcohols (including 1-propanol (C3), 1-hexanol (C6), nonanol (C9), and lauryl alcohol (C12)) modification. The effect of FCs on P. aeruginosa was determined by Minimum inhibitory concentrations (MIC), minimum bactericidal concentrations (MBC), Growth curves, alkaline phosphatase (AKP) activity, crystal violet method, scanning electron microscopy (SEM), membrane potential, PI, cell contents leakage. Results showed that the antibacterial activity of FCs increased after esterification, and the antibacterial activity significantly increased and then decreased with the extension of the alkyl chain of the FCs. Hexyl ferulate (FC6) showed the best antibacterial activities against E. coli and P. aeruginosa (MIC for E. coli was 0.5 mg/ml, MIC for P. aeruginosa was 0.4 mg/ml). And Propyl ferulate (FC3) and FC6 showed the best antibacterial activities S. aureus and B. subtilis (MIC for S. aureus was 0.4 mg/ml, The MIC of B. subtilis was 1.1 mg/ml). In addition, the growth, AKP activity, bacterial biofilm, bacterial cell morphology, membrane potential and cell contents leakage of P. aeruginosa after different FCs were investigated, which found that FCs could damage the cell wall of P. aeruginosa and showed different effects on the P. aeruginosa cell biofilm. FC6 showed the best inhibition on the biofilm formation of P. aeruginosa cells, which caused the surface of P. aeruginosa cells to be rough and wrinkled. Some P. aeruginosa cells showed aggregation and adhesion, even rupture. The membrane hyperpolarization was obvious, which appeared as holes, leading to cell contents leakage (protein and nucleic acid). All these results concluded that the antibacterial activities FCs against foodborne pathogens depended on different fatty alcohol esterification of FA. FC6 showed the best inhibition on P. aeruginosa due to its effect on P. aeruginosa cell walls and biofilms and the leak of the cell contents. This study provides more practical methods and a theoretical basis for giving full play to the bacteriostatic effect of plant FA.
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高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Wenjuan Zhu,Pingning Jin,Hongrui Yang,Fei Li,Chen Wang,Tiemei Li,Jing Fan
Antioxidants, widely utilized in the food packaging field, have a risk of migrating into foodstuffs and eventually entering the human body. In this work, a novel method was established for green extraction and determination of antioxidants in food simulants migrated from plastic packaging materials. It was found that the antioxidants could be extracted directly from food simulants by in-situ formation of hydrophobic deep eutectic solvents with low toxic medium-chain fatty alcohols. Under the optimal conditions, the limit of detection was 0.15 to 0.25 µg/L, and the limit of quantification was 0.5 to 1.0 µg/L for the antioxidants. The extraction reaches equilibrium in 2 min. Importantly, butylated hydroxytoluene was detected in two types of the surveyed food contact materials. The established method shows high sensitivity, high enrichment factor, and strong anti-interference ability, and can be used for the separation and enrichment of ultra-trace antioxidants in foodstuffs.
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高影响因子
Metabolic Engineering Communications
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2022
·
IF 0
Yushi Liu,Wan-Qiu Liu,Shuhui Huang,Huiling Xu,Haofan Lu,Changzhu Wu,Jian Li
Fatty acid-derived products such as alkanes, fatty aldehydes, and fatty alcohols have many applications in the chemical industry. These products are predominately produced from fossil resources, but their production processes are often not environmentally friendly. While microbes like Escherichia coli have been engineered to convert fatty acids to corresponding products, the design and optimization of metabolic pathways in cells for high productivity is challenging due to low mass transfer, heavy metabolic burden, and intermediate/product toxicity. Here, we describe an E. coli -based cell-free protein synthesis (CFPS) platform for in vitro conversion of long-chain fatty acids to value-added chemicals with product selectivity, which can also avoid the above issues when using microbial production systems. We achieve the selective biotransformation by cell-free expression of different enzymes and the use of different conditions (e.g., light and heating) to drive the biocatalysis toward different final products. Specifically, in response to blue light, cell-free expressed fatty acid photodecarboxylase (CvFAP, a photoenzyme) was able to convert fatty acids to alkanes with approximately 90% conversion. When the expressed enzyme was switched to carboxylic acid reductase (CAR), fatty acids were reduced to corresponding fatty aldehydes, which, however, could be further reduced to fatty alcohols by endogenous reductases in the cell-free system. By using a thermostable CAR and a heating treatment, the endogenous reductases were deactivated and fatty aldehydes could be selectively accumulated (>97% in the product mixture) without over-reduction to alcohols. Overall, our cell-free platform provides a new strategy to convert fatty acids to valuable chemicals with notable properties of operation flexibility, reaction controllability, and product selectivity.
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ACS Applied Polymer Materials
·
2023
·
IF 5
Chao Huang,Yunjia Xu,Ruizhi Tang,Shujuan Ma,Bolin Gong,Junjie Ou
Particles with asymmetric morphology or surface chemical identity (Janus) are of great interest in the field of materials due to their special composition and structure. However, it is still a challenge to prepare particles with dual asymmetry via simple and convenient synthesis strategies. Herein, micron-sized dual-asymmetry Janus particles were prepared via photo-induced seeded swelling polymerization within 30 min. By controlling the polarity of the organic solvent (porogenic reagent), Janus particles with various morphologies were fabricated. The particles with convex surfaces, such as dumbbell-shaped, snowman-shaped, and golf-shaped morphologies, were obtained in the polar porogenic system, while the concave surface particles, such as bowl-shaped and ball-in-bowl, were acquired in the non-polar porogenic system. Mushroom-shaped and pinecone-shaped particles were generated in the binary porogenic system. Particularly, snowman-shaped, bowl-shaped, and pinecone-shaped particles were characterized by confocal laser scanning microscopy, exhibiting asymmetric chemical identity. They could be easily modified into amphiphilic solid surfactants for emulsifying oil–water incompatible mixtures with a definite interfacial orientation. This strategy provides a possibility for the simple and rapid preparation of dual Janus particles with asymmetric morphology and chemical identity, which are expected to be produced on a large scale.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Wei Li,Libing Yang,Xiaowen Xie,Kim Hoong Ng,Feng Xu,Chan Zheng,Zhiqi Zhang,Shuhui Li,Jianying Huang,Weilong Cai,Yuekun Lai
Fiber fabrics, especially those with multi-functions, play an important role in the realm of construction industry, ecology, aerospace, etc . In this work, a novel one-step foam-coating method was proposed for multi-functionalization of fabric, co-instilling outstanding superhydrophobicity and flame retardation for better practicality. Furthermore, our proposed coating formulation is green with fluorine- and halogen-free attribute, with only ammonium polyphosphate (APP), Polydimethylsiloxane (PDMS) and phytic acid-dissolved Cu (PA-Cu) co-incorporated in the system. The finished fabric is light and highly breathable, ascribed to its extremely thin coating layer. Also, our proposed method permits material coating with low liquid content, thereby enabling water saving up to 60%. Upon evaluating, fabric, upon treated with our proposed method, promises superhydrophobicity with an high contact angle of 154.8 ± 1.9°. This is endowed by the microstructure and roughened surface of fabric that repels water like lotus leaf. Consequently, an astonishing self-cleaning capability was also realized, allowing facile ‘picking up’ of surface dirt as water rinses over the fabric. As for flame retardation, the treated fabric recorded a high limiting oxygen index (LOI) of 37.5%, comparing to 17.5% of its pristine counterpart. This can be related to the collective functions enabled by the components (APP, PDMS and PA-Cu) in our foam formulation. Principally, our reported effective and low-consumption foam-coating strategy enriches the splendid properties of novel on-demand fabrics for broad applications, concurrently opening up an insightful horizon for other artificial material design as well.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Furong Jin,Xinyue Yin,Yang Wan,Jiukai Zhang,Jindi Wang,Xiangbo Fu,Tianxin Fu,Buwei Liu,Yongshi Chen,Bo Tian,Zhibiao Feng
It is important to detect the presence of biogenic amines (BAs) as indicators of food freshness. The purpose of this study was to develop a novel ultrasonic–microwave synergistic supramolecular solvent liquid–liquid microextraction based on solidification of floating organic droplet (UMS-SUPRAS-SFO-LLME) combined with high-performance liquid chromatography for the determination of BAs. The physical properties and microstructure of SUPRAS based on 1-dodecanol and tetrahydrofuran were studied, and the extraction conditions such as the SUPRAS volume, the UMS process, and the centrifugal conditions were optimized. The results for the extraction kinetics and thermodynamics showed that UMS-SUPRAS-SFO-LLME is a spontaneous, endothermic diffusion process. The linear ranges of this method are 0.1–2.0 × 10 5 ng·mL −1 ( R 2 > 0.994), the limits of detection are 4.0 × 10 -3 -6.0 × 10 -2 ng·mL −1 , and the recoveries were 96.28–103.15%. Compared with existing analysis methods, UMS-SUPRAS-SFO-LLME is a sensitive, green and economical sample pretreatment method for analyzing the enrichment of BAs in beer and fish.
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高影响因子
MATERIALS RESEARCH INNOVATIONS
·
2022
·
IF 0
Ying Zhou,Yi Fan,Jingyu Wu,Li Jiang,Hongjun Yang,Qimin Jiang,Wenyan Huang,Xiaoqiang Xue,Bibiao Jiang
Novel reducing emulsifier monomers 2-(dimethylamino)ethyl dodecyl maleate (DMAEDM) and 2-(dimethylamino)ethyl dodecyl itaconate (DMAEDI) containing polymerisable double bonds, tertiary amine and long-chain aliphatic hydrocarbons were creatively designed and synthesised. Reducing emulsifier monomers (REM) were prepared using dodecanol, acid anhydride and 2-dimethylaminoethyl chloride hydrochloride through a two-step reaction process. The optimum reaction temperature and ratio of chemicals were determined to achieve higher yield and purity of REM products. The product purity was above 95% as determined by gas chromatography. The structure of the products was confirmed by infrared spectroscopy (IR) and proton nuclear magnetic resonance (1H-NMR) spectroscopy. The novel reducing emulsifier monomers have been determined to have good emulsifying performance.
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MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Meichao Liao,Lin Yang,Xiaoyue Yang,Erxu Wang,Bin Lu,Jiye Wang,Li Duan
A novel green vortex-assisted liquid–liquid microextraction based on hydrophobic deep eutectic solvents (VALLME-HDES) technique was developed and applied to the urinary excretion study of Taraxacum mongolicum (TM) extract in rats. Deep eutectic solvent (DES), a less toxic extraction phase, was formed by camphor and 1-hexanol at a molar ratio of 1:2. The key factors affecting the extraction efficiency of the VALLME-HDES method, such as DES volume, vortex time, molar rations of camphor and 1-hexanol, and amount of salts, were systematically examined through one-factor-at-a-time strategy. Under optimum conditions, the developed method exhibited a good linearity (r ≥ 0.9994). The acceptable precision and repeatability were less than 1.10 % and 4.78 %, respectively. Recoveries from urine samples spiked at different concentration levels were 80.0–89.5 % (RSD ≤ 4.78 %). To further investigate the applicability and effectiveness of hydrophobic DES, the validated method was applied to the urinary excretion study of two flavone aglycones in rats after oral administration of the TM extract. The average 48 h cumulative urinary excretion of luteolin and diosmetin accounted for 0.12 % and 1.71 % of the respective administered dose. In addition, the greenness of the proposed method was assessed using the Analytical GREEnness (AGREE) tool. All these results indicated that the proposed method was feasible and efficient, which had great development potential for pharmacokinetic studies and clinical sample analysis.
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危险品化学品经营许可证（带存储）