JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2022
·Vol. 31
·期 2
·812-824
·
IF 4.705
Tian Haizhou,Cheng Sha,Zhen Jianghong,Lei Ziqiang
In arid areas, the rapid evaporation of water leads to severe water shortage for plant growth. Superabsorbent polymers have the prospect of preventing water evaporation because of its excellent water absorbency. However, insufficient in salt resistance, water retention, and swelling rate limit its application. Herein, we fabricated Hydroxyethyl cellulose-g-(Acrylic acid-co-2-Acrylamido-2-methyl-1-propane sulfonic acid)/laterite (HEC-g-P (AA-co-AMPS)/laterite) with exceptional abovementioned performances by aqueous solution polymerization. Under optimal synthesis conditions, the water absorbency of the superabsorbent polymer were 1294 g/g, 177 g/g, and 119 g/g in distilled water, tap water, and 0.9 wt% NaCl solution, respectively. The water retention of the superabsorbent polymer was still as high as 97.7% after 16 h at 25 ℃, the water absorbency was up to 832 g/g after re-swelling for 5 times at 40 ℃, and the water absorption reached swelling equilibrium was only 5 min. We investigated the effect of the mount of swollen hydrogel on the water evaporation rate in soil, and the results showed that hydrogels were effective in inhibiting soil water evaporation. Our study provides a new horizon for the application of superabsorbent polymer.
研究领域:
材料科学
·
环境科学
·
农业科学
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 3
·1-10
·
IF 5.3
Dong Hui,Jiang Zhenlong,Chen Yanan,Han Huabo,Zhou Yanli,Wang Xiaobing,Xu Maotian,Liu Lantao
Hydroxyl radical (•OH) detection is pivotal in medicine, biochemistry and environmental chemistry. Yet, electrochemical method–specific detection is challenging because of hydroxyl radicals’ high reactivity and short half-life. In this study, we aimed to modify the electrode surface with a specific recognition probe for •OH. To achieve this, we conducted a one-step hydrothermal process to fabricate a CoZnMOF bimetallic organic framework directly onto conductive graphite paper (Gp). Subsequently, we introduced salicylic acid (SA) and methylene blue (MB), which easily penetrated the pores of CoZnMOF. By selectively capturing •OH by SA and leveraging the electrochemical signal generated by the reaction product, we successfully developed an electrochemical sensor Gp/CoZnMOF/SA + MB. The prepared sensor exhibited a good linear relationship with •OH concentrations ranging from 1.25 to 1200 nM, with a detection limit of 0.2 nM. Additionally, the sensor demonstrated excellent reproducibility and accuracy due to the incorporation of an internal reference. It exhibited remarkable selectivity for •OH detection, unaffected by other electrochemically active substances. The establishment of this sensor provides a way to construct MOF-modified sensors for the selective detection of other reactive oxygen species (ROS), offering a valuable experimental basis for ROS-related disease research and environmental safety investigations. Graphical
研究领域:
医学
·
生物化学
·
环境化学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Food Measurement and Characterization
·
2023
·Vol. 18
·期 1
·95-104
·
IF 3.4
Sun Xi,Liu Feng,Xue Xiao
Ensuring food safety necessitates rapid and reliable food contaminant detection methods. Here, we present a novel approach that integrates electrochemical sensors with machine learning to detect Sudan Red I in food. Our study showcases a modified stainless steel needle (SSN) electrode adorned with silver nanoparticles (AgNPs) and investigates three distinct convolutional neural network (CNN) architectures: Inception V1, ResNet-50, and SqueezeNet V1.1. This combination aims to predict the sensor response accurately. The AgNPs/SSN electrode displays heightened electrochemical activity towards Sudan Red I, offering a linear detection range of 0.1–20 μM and an exceptional 10 nM detection limit. Notably, the Inception V1 and ResNet-50 networks exhibit superior predictive capability compared to SqueezeNet V1.1. Our interdisciplinary approach establishes a rapid, sensitive, and dependable detection system for food contaminants. By fusing electrochemical sensors with machine learning, we propel the development of intelligent detection systems with significant implications for food safety enhancement. Graphical abstract
研究领域:
食品科学
·
分析化学
·
人工智能
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DOI
高影响因子
MOLECULAR AND CELLULAR BIOCHEMISTRY
·
2024
·Vol. 479
·期 7
·1747-1766
·
IF 3.5
Wang Qun,Lu Weijun,Lu Li,Wu Ruopu,Wu Dongde
Receptor interacting protein serine/threonine kinase 4 (RIPK4) is widely involved in human cancer development. Nevertheless, its role in colon cancer (COAD) has not been elucidated till now. Our research aimed at exploring the function and underlying molecular mechanism of RIPK4 in COAD progression. Through bioinformatic analyses and RT-qPCR, RIPK4 was discovered to be increased in COAD cells and tissues, and its high level predicted poor prognosis. Loss-of-function assays revealed that RIPK4 silencing suppressed COAD cell growth, induced cell cycle arrest, and enhanced cell apoptosis. In vivo experiments also proved that tumor growth was inhibited by silencing of RIPK4. Luciferase reporter assay validated that RIPK4 was targeted and negatively regulated by miR-575. Western blotting demonstrated that Wnt3a, phosphorylated (p)-GSK-3β, and cytoplasmic and nuclear β-catenin protein levels, β-catenin nuclear translocation, and Cyclin D1, CDK4, Cyclin E, and c-Myc protein levels were reduced by RIPK4 knockdown, which however was reversed by treatment with LiCl, the Wnt/β-catenin pathway activator. LiCl also offset the influence of RIPK4 knockdown on COAD cell growth, cell cycle process, and apoptosis. Finally, RIPK4 downregulation reduced RUNX1 level, which was upregulated in COAD and its high level predicted poor prognosis. RIPK4 is positively associated with RUNX1 in COAD. Overexpressing RUNX1 antagonized the suppression of RIPK4 knockdown on RUNX1, Wnt3a, p-GSK-3β, cytoplasmic β-catenin, nuclear β-catenin, Cyclin D1, CDK4, Cyclin E, and c-Myc levels. Collectively, miR-575/RIPK4 axis repressed COAD progression via inactivating the Wnt/β-catenin pathway through downregulating RUNX1.
研究领域:
肿瘤学
·
分子生物学
·
生物信息学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2023
·Vol. 32
·期 2
·536-547
·
IF 5.3
Chen Weishuo,Zhong Channa,Li Shuangcheng,Wen Die,Zhou Dongdong,Shao Jun,Chen Shuiliang,Hou Haoqing,Xiang Sheng
The blends of poly(D-lactic acid) and poly(L-lactic acid) (PDLA/PLLA) produce the stereocomplex crystals (SC) with a melting temperature of ~ 250 °C, which exhibits higher crystallization rate and mechanical strength than PDLA or PLLA. The SC was also reported as an effective nucleator for PLA homochiral crystals (HC). In the PDLA/PLLA blends, the SC would develop at first in most of cases. However, the morphology of SC in the asymmetric blends were rarely reported, and the effect of the SC morphology on the subsequently crystallization of HC was not clear yet. In this study, the PDLA/PLLA blends with dissimilar weight ratios were prepared by three methods, i.e. , electrostatic spinning, solution casting, and melted-cooling, and the SC with different morphologies were achieved. Then, the crystallization behavior of HC under the existence of SC was studied. Results indicated that the SC morphology exerted diverse effects on the formation of HC. The SC with fibrous and banded morphology produced by electrostatic spinning presented great limitation for the formation of HC. The SC with spherical morphology developed in the solution casting films enhanced the formation of HC. The SC with network structure produced in the melted-cooling specimens accelerated the crystallization rate of HC significantly. This investigation indicated that not only the content of SC, but also the morphology of SC would influence the crystallization behavior of HC, which would make a deep understanding for the crystallization behavior of PDLA/PLLA specimens.
研究领域:
高分子科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 31
·期 1
·1-14
·
IF 2.8
Song T.,Ren L.,Li W. B.,Liu Q.,Qin Y. X.,Zhang Y. L.,Wang Y. B.,Shen Y. D.,Du W. N.,Zhang M. Y.
In this contribution, isosorbide dinonanoate (SDN), an environmentally sustainable plasticizer for polypropylene (PP), is successfully synthesized by virtue of esterification reaction using isosorbide and nonanoic acid with the reaction temperature of 120 °C, and the reaction time of 5 h. When the corporation of plasticizer SDN into PP matrix is the value of 15 phr, the impact strength of PP blends reaches 121 J/m, the dramatically increase of 384% compare to that of PP. DMA results shows that the glass transition temperature (T g ) of PP blends gradually decline with the increasing amount of SDN, indicating the efficient plasticization action of the SDN. It is suggested that SDN can be feasibly inserted into the non-polar matrix and then more evenly dispersed in matrix, herein, it will increase the distance between the polymer chains, improving the mobility of the molecular chains and the processing performance of the polymers. Furthermore, the plasticizing effect and environmental friendliness of SDN can be a potential replacement for o-phenyl plasticizers in the industry in the future.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2024
·Vol. 54
·期 8
·1807-1817
·
IF 2.4
Shang Ling-Jun,Yu Shuai-Qun,Shang Xin-Wei,Wei Xiang-Yu,Wang Hui-Ying,Jiang Wen-Shuai,Ren Qiong-Qiong
Regular monitoring of blood glucose levels is crucial in diabetes management. Commonly used procedures may be invasive and can lead to cross-infection and inflammation. Therefore, a safe, non-invasive blood glucose-monitoring technology is needed. Herein, a 3D reduced graphene oxide (rGO) electrode was modified with MXene (Ti 3 C 2 ) and gold nanoparticles (AuNPs) to construct a non-invasive, saliva glucose detection electrode. The Au/rGO-Ti 3 C 2 electrode exhibited good detection performance for glucose concentrations in the range of 10 µM–21 mM at a working potential of 0.6 V, with a detection limit of 3.1 µM glucose, and a sensitivity of 355 µA mM −1 cm −2 . The Au/rGO-Ti 3 C 2 electrode showed almost no response to the addition of interfering substances, and no effect was observed upon subsequent glucose detection. The sensor could detect glucose in artificial saliva and saliva supernatant. The modified electrode showed a significant response to low glucose concentrations, even at 10 µM. These results indicate the suitability of the Au/rGO-Ti 3 C 2 electrode for saliva glucose detection. The electrode developed in this study has great potential in improving the efficiency of diabetes monitoring through pain-free, non-invasive glucose detection in saliva. Graphical abstract
研究领域:
生物医学工程
·
糖尿病研究
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF FLUORESCENCE
·
2024
·
IF 2.6
Wang Yaru,Li Shuhuai,Ma Xionghui,Pang Chaohai,Wu Yuwei,Wang Mingyue,Li Bei,Liu Sixin
Fluorescence intensity and selective recognition ability are crucial factors in determining the analytical techniques for fluorescent probes. In this study, a core–shell fluorescent material, composed of silver nanoparticles@nitrogen-doped graphene quantum dots (Ag NPs@N/GQDs), was synthesised using mango leaves as the raw material through a thermal cracking method, resulting in strong fluorescence luminescence intensity. By employing noradrenaline as a template molecule and using a surface molecular imprinting technique, a molecularly imprinted membrane (MIP) was formed on the surface of the fluorescent material, that was subsequently eluted to obtain a highly specific, fluorescent probe capable of recognising noradrenaline. The probe captured various concentrations of noradrenaline using the MIP, which decreased the fluorescence intensity. Then a method for detecting trace amounts of noradrenaline was established. This method exhibited a linear range from 0.5 –700 pM with a detection limit of 0.154 pM. The proposed method was implemented in banana samples. Satisfactory recoveries were confirmed at four different concentrations. The method presented a relative standard deviation (RSD) of less than 5.0%.
研究领域:
分析化学
·
生物医学
·
食品科学
✓ 已验证
DOI
PubMed
高影响因子
Journal of the Australian Ceramic Society
·
2023
·Vol. 59
·期 4
·915-922
·
IF 1.9
Zhang Jianxiong
ZrO 2 is widely used. However, surface hydrophilicity is harmful to waterproof devices. In this work, epoxy-based polyhedral oligomeric silsesquioxane (POSS) was chemically bonded to ZrO 2 sheet surface for weather-resistant hydrophobicity and anti-adherence property. First, ZrO 2 sheet was modified with hydroxyls, followed by amino modification. Then, surface POSS modification was performed via ring-opening addition. Next, composition and micro-morphology of POSS-treated sheet were clarified. Ultimately, the dependence of water contact angle of POSS-modified sheet on POSS solution treating time was researched, and the highest contact angle of 132.6° was gained by 24-h treating. Acid corrosion, alkali corrosion, and ultraviolet radiation for 48 h were employed to verify good weather resistance with contact angles over 120°. POSS-modified sheet had good anti-adherence capacity. Cooperation of POSS and ZrO 2 was utilized to obtain low surface energy and high surface roughness. This work might help to obtain hydrophobic ceramics as catalyst supports for oil-phase reactions.
研究领域:
材料科学
·
表面化学
✓ 已验证
DOI
高影响因子
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
·
2024
·Vol. 108
·期 1
·1-11
·
IF 3.9
Li Na,Wang Yuan,Meng Yinyin,Lv Yangyong,Zhang Shuaibing,Wei Shan,Ma Pingan,Hu Yuansen,Lin Hui
Abstract Old yellow enzymes (OYEs) have been proven as powerful biocatalysts for the asymmetric reduction of activated alkenes. Fungi appear to be valuable sources of OYEs, but most of the fungal OYEs are unexplored. To expand the OYEs toolbox, a new thermophilic-like OYE ( Af OYE1) was identified from Aspergillus flavus strain NRRL3357. The thermal stability analysis showed that the T 1/2 of Af OYE1 was 60 °C, and it had the optimal temperature at 45 °C. Moreover, Af OYE1 exhibited high reduction activity in a wide pH range (pH 5.5–8.0). Af OYE1 could accept cyclic enones, acrylamide, nitroalkenes, and α, β-unsaturated aldehydes as substrates and had excellent enantioselectivity toward prochiral alkenes (> 99% ee). Interestingly, an unexpected ( S )-stereoselectivity bioreduction toward 2-methylcyclohexenone was observed. The further crystal structure of Af OYE1 revealed that the “cap” region from Ala132 to Thr182, the loop of Ser316 to Gly325, α short helix of Arg371 to Gln375, and the C-terminal “finger” structure endow the catalytic cavity of Af OYE1 quite deep and narrow, and flavin mononucleotide (FMN) heavily buried at the bottom of the active site tunnel. Furthermore, the catalytic mechanism of Af OYE1 was also investigated, and the results confirmed that the residues His211, His214, and Tyr216 compose its catalytic triad. This newly identified thermophilic-like OYE would thus be valuable for asymmetric alkene hydrogenation in industrial processes. Key points
A new thermophilic-like OYE AfOYE1 was identified from Aspergillus flavus, and the T 1/2 of AfOYE1 was 60 °C
AfOYE1 catalyzed the reduction of 2-methylcyclohexenone with (S)-stereoselectivity
The crystal structure of AfOYE1 was revealedv
研究领域:
生物化学
·
工业酶学
·
结构生物学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 7
·5331-5342
·
IF 2.993
Segovia Rubén,Ding Leyan,Jiang Hu,Miao Peng,Sun Xiudong,Shi Hongyan,Gao Bo
CH 3 NH 3 PbI 3 (MAPbI 3 ) exhibits distinctive properties for applications in photovoltaics, light emitting devices, photodetectors, and fuel cells. The working temperature of an optoelectronic device affects the photophysical properties of the active material, which is closely related to the device performance. In MAPbI 3 , these properties are intimately connected with its crystalline structure which is temperature dependent. Here, we study the photoluminescence (PL) behavior of MAPbI 3 microwires (MWs) under recursive tetragonal-to-cubic and cubic-to-tetragonal phase transitions induced by temperature cycles from 40 °C (tetragonal phase) to 80 °C (cubic phase). MWs emission exhibited an initial redshift in wavelength by increasing the temperature from the tetragonal to the cubic phase, but after several thermal cycles, this trend reversed and the emission blueshifted. In both phases independently, the emission blueshifted and became stronger with increasing the cycles. The results indicate a thermal cycling-dependent PL and a gradual crystalline structure deformation due to a reiterated change in the MWs lattice, which implies variation in the electronic bandgap along the heating–cooling process. The alteration of the electronic band structure was corroborated by thermal cycling-reflectance measurements. The awareness behavior of material properties upon phase transitions and temperature fluctuations is of great importance for the optimization of optoelectronic devices.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2022
·Vol. 30
·期 1
·1-11
·
IF 3.061
Guo Ying,Wan Ying,Zhang Yang,Pan Guoyuan,Wang Jing,Yu Hao,Du Xueli,Zhao Muhua,Zhao Guoke,Li Yu,Liu Yiqun
The scarcity of freshwater is one of the challenges faced by humanity today. Solar desalination technology is gaining increasing attention due to its environmental friendliness and sustainability. However, the service life of the evaporator is significantly reduced by the problem of salt deposition during the evaporation process. In this work, a porous Janus evaporator with asymmetric wettability was fabricated using an atomization-assisted non-solvent induced phase separation method. The bottom surface of the Janus evaporator was fabricated with polyacrylonitrile and polyvinylpyrrolidone, working as capillary "pumps" to ensure adequate water supply. The upper surface was made of polyvinylidene fluoride which endows the evaporator with self-floating properties and the addition of CNTs improves its solar-to-vapor conversion efficiency. The micro-nano composite continuous porous structure of the Janus evaporator is beneficial to the enhancement of the capillary action, leading to good salt-repellent performance. The solar-to-vapor efficiency of the seawater desalination experiment under 1 kW·m −2 of sunlight was 81.61%, and the water evaporation rate was 1.30 kg·m −2 ·h −1 . In addition, the evaporator exhibited excellent stability under multiple cycles. It also functioned well in the treatment of organic wastewater. This work provides a novel method for preparing solar desalination materials.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）