CHINESE JOURNAL OF POLYMER SCIENCE
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2014
·Vol. 32
·期 10
·1413-1418
·
IF 1.42
Li Hua-jie,Yu Zhong,Wang Shuang-ping,Zhang Li-ming,Yang Li-qun
Photosensitizer (photosan)-encapsulated micelles were prepared by self-assembly of Photosan with two amphiphilic polysaccharide derivatives, including the cholesteryl conjugated sodium alginate derivative (CSAD) and the deoxycholic acid group conjugated chitosan derivative (DA-Chit). The results of UV-Vis and fluorescence spectroscopy indicated that the hydrogen bonding strength dominated the micelle formation. Methyl viologen was used as a model quencher of photosan. Using the steady-state fluorescence technology, the quenching constants were determined to be 2.05, 1.88 and 0.30 L/mmol for the free photosan, the photosan-CSAD micelle and the photosan-DA-Chit micelle, respectively. This suggested that photosan was protected from quenching of methyl viologen by the polysaccharide micelles. In addition, the protection effect of the photosan-DA-Chit micelle was significantly stronger than that of the photosan-CSAD micelle. The photosan-DA-Chit micelle is thus anticipated for protection of photoactivity of photosan during the blood circulation process in vivo .
研究领域:
药剂学
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生物化学
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Wenhui Ji,Xiaohong Ji,Lin Cao,Qing Yu,Wei Wang
Here, we developed a novel type of composite coating with excellent self-healing and anti-corrosion properties, activated by photothermally responsive nanofillers. The photothermal heterojunction Ag 2 S@Ti 3 C 2 was synthesized and functionalized with a silane coupling agent, and subsequently incorporated into an epoxy resin containing Diels-Alder (DA) bonds. It is found that the heterojunction enhances the light absorption, increases the number and lifetime of photogenerated electron-hole pairs, and facilitates the passage of photogenerated charges through the heterojunction interface, thereby reducing interface transfer resistance and releasing heat. Under irradiation with 808 nm near-infrared light, the photothermal effect of Silane-Ag 2 S@Ti 3 C 2 triggers molecular chain movement and dynamic DA bond reconstruction, thereby repairing scratches in the coating. Surface characterization and electrochemical tests indicate that the coating containing 1 wt% Silane-Ag 2 S@Ti 3 C 2 nanofillers exhibits significant self-healing and anti-corrosion properties. The self-healing rate of the coating approached nearly 96.00 %. After five self-healing cycles, the protective performance of the initial immersion stage was effectively restored, the self-healing rate remained at about 90.00 %. Even after 60 d of immersion, the low-frequency impedance modulus remained above 10 8 Ω·cm 2 . This study presents a novel strategy for the development of multi-cycle self-healing coatings utilizing photothermal effects.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
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2023
·
IF 6
Zhichao Xiong,Wanzhen Feng,Dongzhou Xia,Jixin Zhang,Yuming Wei,Tiehan Li,Junlan Huang,Yujie Wang,Jingming Ning
The authenticity of the geographical origin of agricultural products has received widespread attention. Tea tree varieties, processing processes and origins influence the quality and price of raw pu-erh tea (RPT). This study distinguished RPT from 10 different production areas through headspace solid-phase microextraction-gas chromatography-mass spectrometry (HS-SPME-GC-MS) combined with orthogonal partial least squares–discriminant analysis (OPLS-DA) model and machine learning algorithms. Among the thirty-five types of common volatiles identified, pentanal, heptanal, naphthalene, cedrol, and 2,6-di- tert -butylbenzoquinone were considered the key differential compounds distinguishing the 10 different production areas of the RPT samples through the screening of variable importance in projection values of the OPLS-DA and coefficient weights of the linear discriminant analysis function. Among them, heptanal and 2,6-di- tert -butylbenzoquinone had the highest content in West of Bingdao and the lowest content in Nannuoshan. The random forest algorithm achieved a discrimination accuracy of 98.4% based on the discrimination of five key compounds in 63 RPT samples. The random forest model was demonstrated to be reliable and valid by using receiver operating characteristic curves (area under the curve = 0.7603). The study results serve as a reference for the differentiation of 10 production areas of RPT.
研究领域:
食品科学
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分析化学
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机器学习
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产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Kexiang Li,Hong Li,Qian Zhang,Dezhi Yang,Yaling Yang
In this work, a facile synthesis method for dopamine carbon dots-based Au nanoparticles (DA-CDs/AuNPs) by seed gold method was reported as the surface enhanced Raman scattering (SERS) booster. DA-CDs with rich in surface functional groups was synthesized using dopamine, citric acid and ethylenediamine as precursors by a facile hydrothermal method, and can be used as the capping agents and reducing agents for the synthesis of DA-CDs/AuNPs. Due to the electromagnetic “hot spots” effect, DA-CDs/AuNPs with core–shell structure exhibited strong SERS activity. Based on the specific interaction of DA-CDs/AuNPs and fenamidone, a detection method of fenamidone was established with a low detection limit of 0.05 μg/mL. Finally, the SERS sensor was successfully applied to the detection of fenamidone in fruit with recoveries between 90.6 % and 98.7 %. The method here proposed can be reliably applied for fenamidone detection on fruits.
研究领域:
材料科学
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分析化学
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纳米技术
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Bin Wu,Weiyi Fan,Ruochen Wang,Naixin Wang,Yue Shen,Mwema Wanjiya,Yanhui Wu,Quan-Fu An
Organic molecule desalination with nanofiltration has important practical application significance. Zwitterion-based nanofiltration membranes (ZNFMs) with selective channels for monovalent salts have been prepared to improve the separation performance. However, most ZNFMs tend to be restricted by their loose structures, which results in unsatisfactory rejection for small molecules with sub-200 Da molecular weight. In this study, a synchronous modification strategy during the heat treatment of interfacial polymerization was proposed, in which various multi-amine solutions were employed as the novel medium of heat treatment to regulate the structures of ZNFMs. The pore size distribution of membranes could be narrowed to a certain degree through cross-linking by corresponding multi-amines. The optimized ZNFMs exhibited excellent retention to small molecules. For example, the retention of glucose was dramatically increased to 96.5%. Meanwhile, the ZNFMs also had low rejection for monovalent salts, such as KCl (26.7 %). Consequently, the separation factor between glucose and KCl reached 21.2, which demonstrated a great potential for organic molecule desalination with sub-200 Da molecular weight.
研究领域:
化学工程
·
材料科学
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环境工程
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产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2023
·
IF 5.5
Li Shaofeng,Zhang Meilin,Sun Jian,Sun Jianping,Wang Ying
Polyvinylidene fluoride (PVDF) membranes are favored for their excellent properties. However, the inherent strong hydrophobicity of PVDF membranes limits their development in the field of water treatment. The objective of this study was to improve the performance of PVDF membranes using the self-polymerization, strong adhesion properties, and biocompatible effects of dopamine (DA). The PVDF/DA membrane modification conditions were simulated and optimized using response surface methodology (RSM), and the experimental design was used to investigate three main parameters. The results showed that the DA solution concentration of 1.65 g/L, the coating time of 4.5 h, the post-treatment temperature of 25°C, the contact angle decreased from 69° to 33.9°, and the pure water flux on the PVDF/DA membrane was higher than that on the original membrane. The absolute value of the relative error between the actual and predicted values is only 3.36 %. In the MBR parallel comparison test, compared with the PVDF/DA membrane, the total amount of extracellular polymers (EPS) of the PVDF membrane increased by 1.46 times and the polysaccharide increased by 1.56 times, which further showed that the PVDF/DA modified membrane had the excellent anti-pollution ability. Through Alpha diversity analysis, the biodiversity detected on PVDF/DA membranes was higher than that of PVDF membranes, which further proved its good bio-adhesion ability. These findings could offer a reference for the hydrophilicity, antifouling, and stability of PVDF/DA membranes, which would establish the foundation for the comprehensive applications in MBR.
研究领域:
材料科学
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环境工程
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产品关联
DOI
PubMed
高影响因子
Frontiers in Plant Science
·
2025
·
IF 4.8
Xiaowei Zhang,Tianyu Dong,Dan Chen,Haowei Sun,Anchuan Xu,Chunqiong Wang,Dan Li,Jieyun Cai,Lingduo Bu,Ke Zhang,Haitao Chen
The flavor of cigar smoke directly influences the consumer’s willingness to purchase. However, the analysis of cigar smoke was lack. In this research, a total of 235 volatile compounds were identified by GC×GC-TOFMS in cigar smoke from Yuxi, Dehong and Pu’er regions of Yunnan, including 72 alkenes, 47 aromatic hydrocarbons, 42 heterocyclics, 28 ketones, 8 alcohols, 4 aldehydes, 3 esters, 13 phenols, 5 acetonitrile and 13 others. ROAV analysis indicated that o-cresol, guaiacol, 2,6-dimethyl-phenol, 4-hydroxy-3-methoxystyrene, (E,E)-2,4-hexadienal, butylbenzene, naphthalene, nicotine and D-limonene might be the key flavor compounds. By OPLS-DA, 2-methyl-pyridine, 2,4-dimethylfuran, 2-carene, 13-heptadecyn-1-ol, 1-ethyl-2-methyl-benzene, 2,3,5,8-tetramethyl-1,5,9-decatrien, 1-ethyl-4-methyl-benzene, β-elemene, methyl isobutyl ketone and 3-methylcyclopentanone were found to be the differential volatiles distinguishing samples from different areas. Eventually, 5 groups of potential flavor precursors were summarized and identified (cembranoid, phenylalanine, chlorophyll, carotenoid and reducing sugar). This research has provided theoretical guidance for the improvement of flavor quality of cigar smoke in Yunnan.
研究领域:
分析化学
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食品科学
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烟草化学
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代谢组学
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风味化学
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产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 3
·567
·
IF 4.2
Yayun Guo,Zhe Wang,Yi He,Huanhuan Gao,Hongmei Shi
Aspergillus carbonariusis known to produce the carcinogenic ochratoxin A (OTA) in grapes. The metabolism process before OTA biosynthesis influences the content and composition of the volatile compounds in grapes. In this study, a self-established method based on QuEChERS coupled with high-performance liquid chromatography–fluorescence detection (HPLC-FLD) was used to determine the OTA levels during a seven-day contamination period. The results showed that OTA was detected on the second day after contamination withA. carbonarius. Thus, the first day was considered as the critical sampling timepoint for analyzing the volatiles in grapes before OTA biosynthesis. Additionally, the volatile compounds in grapes were analyzed using headspace solid-phase microextraction gas chromatography–mass spectrometry (HS-SPME-GC-MS) and dispersive liquid–liquid microextraction gas chromatography–mass spectrometry (DLLME-GC-MS). The corresponding data were evaluated via multivariate data analysis using projection methods, including PCA and OPLS-DA. The results indicated significant differences in the nine volatile compounds in grapes contaminated withA. carbonariusbefore OTA biosynthesis. The results of the Pearson correlation analysis showed positive correlations between ethyl acetate, styrene, 1-hexanol and OTA; (E)-2-hexenal and nerolic acid were negatively correlated with OTA. Overall, these findings provide a theoretical basis for the early prediction of OTA formation in grape and grape products using GC-MS technology.Keywords:volatile compounds;Ochratoxin A;QuEChERS-HPLC-FLD;HS-SPME-GC-MS;DLLME-GC-MS;OPLS-DA
研究领域:
食品科学
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真菌学
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分析化学
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产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
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2023
·
IF 7
Qiang Liang,Xiujun Wang,Xiaoyue Zhang,Bo Jing,Ming Duan,Shenwen Fang
The branched amphiphilic copolymer of N-(3-dimethylaminopropyl) methacrylamide and polyether macromonomer (DA) can gather a large number of oil droplets and bubbles together to form oil aerated flocs, and cooperate with air-flotation cyclone separation device to achieve efficient oil-water separation. In this paper, the effects of DA and linear cationic flocculant polymethylacryloxyethyl trimethylammonium chloride (PDMC) on interaction between dispersed phases in produced water were studied from the microscopic point of view, and the reason why oil aerated flocs can be formed under the action of DA was analyzed. Firstly, the aggregation behaviors of the dispersed phases (including oil droplets and bubbles) in water were studied intuitively by microfluidic experiment. Then, the interaction between oil droplets and the interaction between oil droplet and bubble were studied by optical tweezers and oil-coated bubbles experiments, respectively. The experimental results showed that both the efficiencies of oil droplets coalescence and oil droplet-bubble adhesion of DA were 5 times higher than that of PDMC at concentration of 500 mg/L. DA can enhance the attraction force between oil droplets while PDMC cannot. The film drainage time of oil droplet-bubble adhesion of DA was 3 times shorter than that of PDMC. The increasing temperature and salinity had the negative effect on the film drainage oil droplet-bubble adhesion of DA. In addition, the type of attraction force between oil droplets under action of DA still needs analysis and the generation reason needs molecular dynamics simulation study. The research results of this paper can give a guide to the development of DA type flocculants.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Peng Zhou,Shihong Zhang,Yi He,Jingcheng Wu,Liang Zhou,Xiangying Yin,Shuting Tian,Shuangshuang Li,Wen Chen
With industry development, the reuse of water and oil resources has become an urgent problem. At present, the evolution of simple-minded approaches to attain modification on the membrane surface for a more complex circumstance, such as oily wastewater and dyes at the same time, has become a red-hot but challenging topic for research. Membrane separation technology has successfully built up to cope with these issues, such as oil-in-water emulsion separation and dye adsorption owning to its benign mechanical characteristics and low power consumption. Therefore, we report a simple-minded one-step approach for uses in oil-in-water emulsion separation and dye adsorption. In this work, a new multifunctional membrane surface is constructed via the concurrent incorporation of silk fibroin (SF) and dopamine hydrochloride (DA) in co-deposition to reach a large flux for complex wastewater separation. The qualified membrane has super hydrophilic in the air and has brilliant oil adhesion resistance underwater. It works comfortably on oil-in-water emulsions (over 10400 L m −2 h −1 bar −1 ) or dyes (above 3738.68 mg m −2 ). More importantly, excellent adsorption efficiency (>99%) and extensive adsorption capability (over 2071.91 mg m −2 ) were achieved by the oil-in-dye emulsion that stabilized with surfactant. It not only possesses a broad span of use outlooks but also enlightens imports for the evolution of functional coating in the future.
研究领域:
环境科学
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材料科学
·
化学工程
·
水处理
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DOI
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2026
·
IF 6.6
Fang Jia,Di Chen,Ziyuan Huang,Chengjie Wan,Ziyan Li,Tengchao Huang,Shuangqi Gao,Ying Guo
The incidence of acute ischemic stroke (AIS) has shown a persistent upward trend in recent years. External factors, including chemical and plastic exposures, have been shown to worsen the prognosis of cerebrovascular diseases, especially AIS. Hexafluoropropylene oxide dimer acid (HFPO-DA), a prevalent plastic additive, is globally distributed. However, its bioaccumulation potential and neurovascular toxicity remain poorly understood. Using a mixed subchronic-acute aggravation model in middle cerebral artery occlusion/reperfusion (MCAO/R) rats, we found that HFPO-DA exposure dose-dependently exacerbated neurological deficits, enlarged infarct volumes, and intensified reactive microgliosis. Computationally, we prioritized the CSNK2A1/GSK3B/NF-κB signaling axis as a key mechanistic candidate, with bindings predicted by molecular docking. In vitro cellular thermal shift assays (CETSA) coupled with targeted siRNA knockdown in BV2 cells supported a direct physical interaction between HFPO-DA and CSNK2A1. Moreover, in vivo CSNK2A1 inhibition with CX-4945 partially reversed the HFPO-DA-induced aggravation of ischemic injury. Collectively, our results suggest that HFPO-DA might be a potent environmental driver of post-ischemic neuroinflammation, likely acting in part via the CSNK2A1/GSK3B/NF-κB signaling pathway. These results provide novel insights into the specific neurotoxic mechanisms of HFPO-DA, highlighting its potential health risks in susceptible populations.
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产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2026
·
IF 7.1
Le Fu,Tian-Nan Man,Teng Liu,Sergey Victorovich Panin,Zhi-Sheng Nong
This study developed a novel carbon-based nanofiller CNTs-DA via a bridging method, which was then combined with thermally insulating filler silica aerogel (SA) and epoxy resin (EP) binder to fabricate a multifunctional coating with both thermal insulation and flame-retardant properties. The results show that with the addition of CNTs-DA, the flame-retardant efficiency of the coating first increases and then decreases. When the loading of CNTs-DA is 5 wt%, a uniform three-dimensional network structure of SA and CNTs-DA forms in the coating. Compared with the sample without CNTs-DA, the peak heat release rate (pHRR) and total heat release (THR) are reduced by 36.69% and 26.48%, respectively. The EP coating with the highest thermal insulation performance is the sample containing 5 wt% CNTs-DA at 200°C, which exhibits an insulation temperature of 64.8°C. In comparison, the EP coating with only SA shows an insulation temperature of 59.6°C. The synergistic interaction between SA and CNTs-DA results in the thermal insulation performance of the composite coatings. The CNTs-DA contribute to thermal insulation by effectively extending the pathway for heat conduction. This work demonstrates that uniformly dispersed SA and CNTs-DA can synergistically endow the EP coating with excellent thermal insulation and flame-retardant performance.
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DOI
高影响因子
危险品化学品经营许可证（带存储）