Journal of Food Measurement and Characterization
·
2020
·Vol. 14
·期 5
·2549-2558
·
IF 1.648
Hu Jun,Liu Yande,He Yong,Sun Xudong,Li Bin
Food safety has been an issue of common concern in today’s society. Excessive benzoic acid (BA) additives in wheat flour would pose a huge threat to human health. In this paper, terahertz (THz) time-domain spectroscopy was used to detect BA quantitatively, which is a preservative additive in flour. Samples were prepared by grinding, drying, weighing, mixing and performing successively according to the designed concentration gradient (concentration 0.04%, 0.08%, 0.1%, 0.2%, 0.4%, 0.5%, 1%, 1.5%, …, 10%), with the BA concentration ranging from 0.040% to 19.99%. Then the THz Spectra of wheat flour samples with different concentrations of BA were collected. After preprocessing the original terahertz spectra with multiple scattering correction and other methods, Competitive Adaptive Reweighted Sampling (CARS), Genetic Algorithm (GA), Principal Component Analysis (PCA) and Uninformative Variable Elimination (UVE) were used to select effective spectral bands, and then Partial Least Squares (PLS) and Least Square Support Vector Machine (LS-SVM) models were established respectively. It turned out that the absorption peak of BA was at 1.94 THz of terahertz absorption coefficient, which increased with the rise of BA concentration. The results also indicated that better modeling results could be obtained by using CARS method for variable selection. And the established CARS-PCA-LS-SVM model had the best prediction result by combining PCA with CARS, with the correlation coefficient of the prediction (R p ) of 0.9956 and Root Mean Square Error of Prediction (RMSEP) of 0.64%. Hence, it can be concluded that terahertz technology combined with LS-SVM model can well achieve the quantitative detection of BA concentration in flour. Although the model is not universal since samples size is not large enough, the research method provides a basis for the detection of BA additives in flour.
研究领域:
食品科学
·
分析化学
·
光谱学
·
食品安全
·
计算生物学
·
分子检测技术
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DOI
高影响因子
JOURNAL OF SOILS AND SEDIMENTS
·
2016
·Vol. 17
·期 2
·536-542
·
IF 2.206
Zhang Jinyang,Li Chuxian,Wang Dingyong,Zhang Cheng,Liang Li,Zhou Xiong
Purpose The environmental safety of both nano-TiO 2 particles and mercury (Hg) pollution has been of widespread concern. Soils and sediments were the main receiving environments of nano-TiO 2 and Hg. There was a strong association between nano-TiO 2 with Hg compounds. Very limited research has been carried out on the impact of nano-TiO 2 on the environmental behavior of Hg in sediments. The objective of this study was to investigate the effects of nano-TiO 2 on the release and transformation of Hg in sediments. Materials and methods Two types of TiO 2 nanoparticles were employed. Sediment samples were collected in the water level fluctuating zone of the Three Gorges Reservoir, China. Sediment samples spiked with HgCl 2 solution were taken as Hg-contaminated sediments. The flooding experiments were conducted using capped borosilicate glass bottles containing 300 ml TiO 2 suspensions (0.2 g L −1 and 0.4 g L −1 ) and 30 g original or Hg-contaminated sediment samples outdoors. All experiments were conducted in triplicate. Water samples were collected at determined interval times over a 60-day period. Sediments were collected on the 60th day. Total Hg (THg) and methylmercury (MHg) in both water and sediment samples and Hg speciation just in sediment samples were determined. A series of control samples without TiO 2 addition were also prepared. Results and discussion The results showed that nano-TiO 2 particles at high content (4 g kg −1 ) promoted the release of Hg in sediments, and the anatase particles showed a stronger effect. Methyl Hg concentrations in waters of nano-TiO 2 treatments significantly decreased by the 10th day. The effect of nano-TiO 2 greatly depended on anatase and rutile particles. After that, methyl Hg concentrations had no significant difference between nano-TiO 2 treatments and the control, except 2 g kg −1 rutile treatment by the 20th day. The changes of Hg speciation in sediments demonstrated that nano-TiO 2 inhibited the transformation of Hg-bound organic matter into the oxidated state, especially upon 2 g kg −1 rutile treatment. This was consistent with the lower MHg concentrations in the 2 g kg −1 rutile treatment. Conclusions Both anatase and rutile nano-TiO 2 were found to affect the release of Hg in sediment. Nano-TiO 2 promoted THg release in sediments and posed an increased risk of Hg contamination in waters, especially for anatase particles. Moreover, nano-TiO 2 inhibited the methylation process of Hg in sediments at the initial stage of flooding and could affect the transformation of Hg speciation in sediments, especially for low-content rutile particles.
研究领域:
环境科学
·
地球化学
·
水体生态学
·
污染控制
·
环境毒理学
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DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2024
·Vol. 130
·期 3
·203
·
IF 2.5
Xu Yingying,Xia Siyi,Zhang Yingjiu,Song Hongzhang,Liu Shaohui,Hao Haoshan
In this study, ceramic samples of Bi 2 Sr 2 Co 2 O y + v wt% B 2 O 3 ( v = 0.0, 0.1, 0.2, 0.3, 0.4) were synthesized using the solid state reaction method, and the influence of B 2 O 3 additive on their microstructure and thermoelectric properties were investigated. On one hand, the B 2 O 3 additive acted as a sintering aid, enhancing carrier mobility. On the other hand, B 2 O 3 dispersion served as a nano-second-phase, increasing hetero-interfaces and strengthen phonon scattering, thereby effectively suppressing lattice thermal conductivity. By dual optimization of both electric and thermal transport performance, the Bi 2 Sr 2 Co 2 O y + 0.3 wt% B 2 O 3 sample achieved a high ZT value (thermoelectric figure of merit) of 0.31 at 923 K, which was improved by approximately 33% compared with the pristine Bi 2 Sr 2 Co 2 O y sample.
研究领域:
材料科学
·
凝聚态物理
·
无机非金属材料
·
热电材料
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DOI
高影响因子
CELLULOSE
·
2016
·Vol. 23
·期 4
·2539-2548
·
IF 3.195
He Hui,Hou Xunan,Ma Beibei,Zhuang Linzhou,Li Chuanfa,He Shihong,Chen Shuixia
Viscose fiber was oxidized with sodium periodate to prepare a reactive dialdehyde viscose fiber (DAVF) containing abundant aldehyde groups. A solid amine adsorbent (DAVF-PEI) with high amino density for CO 2 capture was then prepared by modifying DAVF with polyethylenimine (PEI). Response surface methodology (RSM) based on a three-level, three-factorial design was used to optimize the synthesis conditions of DAVF, in which multiple linear regression equations of aldehyde content and fiber mass loss degree were constructed. The well-designed DAVF was then employed as a support to graft with PEI via Schiff base reaction to prepare a solid amine fiber (DAVF-PEI) for CO 2 adsorption. The experimental results verified that DAVF-PEI possessed good thermo-stability and high CO 2 adsorption capacity (4.11 mmol/g). DAVF-PEI also showed promising regeneration performance, which could maintain almost the same adsorption capacity for CO 2 after ten adsorption and desorption recycles.
研究领域:
材料化学
·
环境科学
·
高分子科学
·
化学工程
·
吸附分离
·
碳捕集技术
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 4
·2887-2894
·
IF 2.22
Liu Yuan,Gu Yi-Jing,Deng Jia-Li,Luo Gui-Yang,Wu Fu-Zhong,Mai Yi,Dai Xin-Yi,Li Jun-Qi
A series of LiFe 1− x Mn x PO 4 /C composites were successfully synthesized through a simple hydrothermal method. The effects of doped Mn on their micro-structures and electrochemical performances were investigated. The XRD results indicate that Mn doping cannot change the olivine lattice type of LiFePO 4 . Appropriate Mn doping can reduce the particle size of LiFePO 4 . The electrochemical performance data show that the electrochemical performances of the composite materials are enhanced at first and then decrease as the doping amount of Mn increases. Both the CV and EIS results illustrate that a small amount of doped Mn will reduce the electrode polarization and electrochemical impedance of the samples and simultaneously improve the electrochemical performance. Among all the samples, the LiFe 0.98 Mn 0.02 PO 4 /C sample has a desirable electrochemical performance, with its specific discharge capacity reaching 156.0 mAh g −1 at a rate of 0.1 C. Even at a high rate of 5 C, it can still reach 110.0 mAh g −1 . All the results indicate that an appropriate amount of doped Mn has an emphatic effect on the electrochemical performance of LiFePO 4 /C.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
纳米材料
·
固态化学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 31
·期 1
·542-547
·
IF 2.195
Zhang Xiuyun,Zhao Yunyun,Ling Qia,Zhu Guisheng,Zhou Xiujuan,Deng Jianqiu,Yan Dongliang,Liu Laijun,Xu Huarui,Yu Aibing
Amorphous Li–Si–Ti–P–O (LSTP) thin film electrolyte was successfully prepared by radio frequency magnetron sputtering using Li 1.4 Si 0.4 Ti 1.6 (PO 4 ) 3 powder targets and stainless steel sheet as substrate. The effects of sputtering power on the structure, morphology, ionic conductivity, and electronic conductivity of the LSTP thin film electrolyte were investigated. The results showed that the LSTP thin film electrolyte obtained with sputtering power kept at 160 W, displayed uniform particles compacted in arrangement, proper stoichiometric ratio to the powder target as well as sufficient Li-ion for diffusion. Hence, it held a considerable ionic conductivity of 4.12 × 10 −6 S cm −1 and a high σ ion / σ ele ratio about 8 magnitudes, indicating that it can be used as film electrolyte in all-solid-state lithium batteries.
研究领域:
材料科学
·
电化学
·
固态离子学
·
薄膜技术
·
能源材料
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DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2018
·Vol. 124
·期 10
·675
·
IF 1.604
Thu Tran V.,Thao Vu D.
Combination of co-precipitation and hydrothermal methods is a promising route to synthesize various materials. Herein, we synthesized reduced graphene oxide/manganese ferrite (rGO/MnFe 2 O 4 ) nanocomposites through combining a co-precipitation reaction of Mn 2+ and Fe 3+ ions in GO solution with subsequent hydrothermal treatment at different temperatures (80, 130, and 180 °C). The resulting rGO/MnFe 2 O 4 nanocomposites were characterized using X-ray diffractometry, Fourier-transform infrared spectroscopy, scanning and transmission electron microscopy, and magnetic measurements at room temperature. The influence of hydrothermal temperature on structural, morphological, magnetic and As(III) adsorption properties of rGO/MnFe 2 O 4 nanocomposites was studied. Increasing hydrothermal temperature leads to better crystallinity, magnetic properties, and As(III) adsorption capacity. At the hydrothermal temperature of 180 °C, the resulting rGO/MnFe 2 O 4 nanocomposites exhibited a crystalline size of 37.2 nm, saturated magnetization of 22.7 emu/g, and As(III) removal efficiency of 83% at neutral pH (pH ≈ 7).
研究领域:
材料科学
·
纳米科技
·
环境功能材料
·
磁性材料
·
无机非金属材料
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 52
·期 2
·1194-1202
·
IF 2.302
Wu Jindan,Wei Wei,Zhao Sufang,Sun Mengyuan,Wang Jiping
Since oil-removing materials are prone to be fouled by viscous oils, causing the loss of their separation performance, water-removing textile-based materials were developed for oil/water separation with high water flux, easy-cleaning ability, and long-term efficiency in this study. Three types of highly hydrophilic and underwater oleophobic fabrics with different pore morphologies and sizes were obtained by poly(vinyl alcohol) (PVA) crosslinking. Due to the special wettability, highly porous structure, and good softness, the PVA-modified textiles served as a great filtration material for oil/water mixtures and the separation efficiency achieved above 99 %. The low-fouling performance ensured the textiles being easily cleaned and keeping high separation efficiency after using for 10 times. Factors affecting the oil/water separation performance were studied, and it was found that the separation efficiency was essentially determined by surface underwater oleophobicity and mean pore size. This study provided a fundamental understanding of the design and fabrication principle of oil/water separation materials.
研究领域:
材料科学
·
环境工程
·
表面化学
·
分离技术
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DOI
高影响因子
BIOMEDICAL MICRODEVICES
·
2016
·Vol. 18
·期 6
·110
·
IF 2.227
Wang Jingjing,Wang Lihao,Zhu Yinfang,Zhang Jinying,Liao Ju,Wang Shuaipeng,Yang Jinling,Yang Fuhua
Early liver cancer diagnosis has clinical significance in treating cancer. Joint detection of multiple biomarkers has been considered as an effective and reliable method for early cancer diagnosis. In this work, a novel biosensor based on microcantilever array was batch-fabricated for multiple liver cancer biomarkers detection with high sensitivity, high accuracy, high throughput, and high specification. A micro-cavity was designed in the free end of the cantilever for local reaction between antibody and antigen, which can dramatically reduce the effect of adsorption-induced stiffness coefficient k variation. Furthermore,the pillar arrays in the micro-cavity were designed for increasing detection upper limit. A linear relationship between the relative frequency shift and the antigen concentration was observed for three liver cancer biomarkers, alpha-fetoprotein (AFP), γ-glutamyltranspeptidase II (GGT-2), and hepatocyte growth factor (HGF). Slight cross-reaction response to different antigens ensures high specificity of the sensor. These features will promote clinical application of the cantilever sensors in early cancer diagnosis.
研究领域:
生物医学工程
·
生物传感器
·
癌症诊断
·
微机电系统(MEMS)
·
肿瘤学
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DOI
高影响因子
Chinese Medicine
·
2026
·Vol. 21
·期 1
·34
·
IF 5.7
Fan Haibo,Hou Yalei,Li Yue,Zheng Zhiwen,Wang Xuelun,Li Yunfeng,Li Yongmin
Background Metabolic-associated fatty liver disease (MAFLD) is a common metabolic disease with complex pathogenesis and lack of effective treatment. Si-Ni-San (SNS), a traditional Chinese medicine, has emerged as a promising candidate for MAFLD treatment. However, the protective mechanism remains unclear. Methods C57BL/6N mice were fed with high-fat diet (HFD) for 12 weeks to establish MAFLD mouse model. Concurrently, oleic acid-induced HepG2 cells were used in vitro as a cellular model for MAFLD. The effects of SNS and the positive drug obeticholic acid on hepatic lipid droplets deposition in MAFLD mice and cell models were evaluated. The expression levels of farnesoid X receptor (FXR) and glycerol 3-phosphate acyltransferase 4 (GPAT4) were detected by western blot. The siRNA and dual-luciferase reporter assay were used to detect the interaction between FXR and GPAT4. High-performance liquid chromatography (HPLC) was used to identify the active components in the SNS aqueous solution, and their binding affinities to targets were detected through molecular docking, molecular dynamics simulations, and surface plasmon resonance (SPR). Results The active ingredients of SNS were identified by HPLC. SNS ameliorated hepatic lipid droplets deposition in both mouse and cellular models of MAFLD. SNS up-regulated the expression of FXR and down-regulated the expression of GPAT4 in hepatic tissues, thereby modulating proteins involved in hepatic lipolysis and lipophagy. FXR reduced lipid droplets accumulation by inhibiting GPAT4. The dual-luciferase reporter assay confirmed that FXR transcriptionally regulated and inhibited GPAT4 expression. Furthermore, molecular docking and molecular dynamics simulations predicted potential interactions between the active components of SNS and the FXR and GPAT4 proteins, with the binding affinity for FXR being subsequently confirmed through SPR analysis. Conclusion This study provided a new mechanistic exploration for FXR in improving MAFLD and broadened the research direction on the mechanisms by which SNS reduced hepatic lipid droplets deposition. It also offers a molecular dynamics basis for subsequent studies on how active components in SNS exert their effects through binding to FXR.
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产品关联
DOI
PubMed
高影响因子
Nano-Micro Letters
·
2026
·Vol. 18
·期 1
·114
·
IF 36.3
Kong Lingli,Lu Junjie,Luo Tianwen,Huang Bai,Fu Lihua,Lin Baofeng,Xu Chuanhui
The global energy crisis and electricity shortage pose unprecedented challenges. Bio-based solar-driven ionic power generation devices with flexibility, photothermal self-healing and scalability hold great promise for sustainable electricity and alleviating energy crisis. Here, inspired by plant transpiration, a multifunctional bio-based ion conductive elastomer with solar power generation capability was designed by engineered synergy among epoxy natural rubber, cellulose nanofibrils, lithium bis(trifluoromethane) sulfonimide and eumelanin. The film exhibits an outstanding stretchability (1072%) and toughness (22.7 MJ m −3 ). The favorable synergy of low thermal conductivity, high hygroscopicity and photothermal conversion performance endowed the film with a large thermal gradient under light illumination, driving efficient water transpiration. Furthermore, the excellent interfacial compatibility between eumelanin and matrix facilitates the formation of space charge regions, which further enhances Li + transport. The film demonstrates excellent evaporation rate (2.83 kg m −2 h −1 ), output voltage (0.47 V) and conductivity (5.11 × 10 –2 S m −1 ). Notably, the film exhibits remarkable photothermal self-healing performance even in saline environment, achieving 99.6% healing efficiency of output voltage. Therefore, the film demonstrates significant prospects for applications in photo-thermoelectric generation and solar-driven ionic power generation.
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产品关联
DOI
PubMed
高影响因子
PLANT AND SOIL
·
2026
·
IF 4.1
Liu Zihao,Huang Yahui,Chen Xiaoming,Zhu Jie,Tang Fanzhou,Zhu Wenkun,Wang Qing,Huang Zhaohui,Zhu Bo
Aims To address the limitations of Phytoextraction and Phytostabilization, this study introduced a novel "root accumulation" strategy by synergizing the advantages of phytoextraction and immobilization techniques for Cd-contaminated soil remediation. Methods A pot experiment was conducted to screen nine plant species using microbial inoculation, and Lolium multiflorum was selected. Foliar application of control agents was applied, and NO was identified as the most effective. An integrated remediation system was established, and soil microbial communities were preliminarily analyzed. Results Lolium multiflorum exhibited the highest root biomass (3.96 g pot –1 ) and root Cd content (82.60 mg kg –1 ), significantly exceeding other species ( P < 0.05), along with a high Bioconcentration Factor (BCF) (2.75) and low Transfer Factor (TF). Under 5 mg kg –1 Cd, TF increased by up to 41.25%. Foliar application of NO, Se, and Si effectively suppressed Cd translocation to shoots, with NO showing the strongest inhibition and simultaneously enhancing uptake of Ca, Mg, Cu, and Zn. The combination of foliar NO (30 mg L –1 ) and microbial consortium achieved the highest root BCQ (0.294) under 10 mg L –1 Cd, while improving plant tolerance and soil microbial diversity. Conclusions This study successfully developed an efficient root accumulation system within a single plant framework, enabling simultaneous reduction of shoot Cd levels and enhancement of root Cd sequestration. These findings offer critical insights and technical advancements for sustainable precision agriculture and environmentally sound soil remediation strategies. Graphical
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）