Food Analytical Methods
·
2022
·Vol. 15
·期 12
·3468-3478
·
IF 3.498
Li Junkui,Zuo Min,Zhang Wen,Zou Xiaobo,Sun Zongbao
The use of gutter oil in cooking, which poses a serious threat to human health, has attracted increasing attention in recent years. Capsaicin, existing in chili peppers, is used to identify gutter oil. Here, in order to detect capsaicin fast and accurately for gutter oil discrimination, we introduce a hybrid method to detect capsaicin based on a diazo coupling reaction and surface-enhanced Raman scattering (SERS) technology. A diazo coupling reaction is applied to the composite of p-aminothiophenol (4-ATP) and capsaicin, and the product, azo dye, is adopted as the SERS probe. Gold nanorods (Au NRs) are prepared using the seed-mediated growth method and utilized as the SERS substrate. The Au–S bond between the azo dye and the Au NRs has a powerful ability to spontaneously capture target molecules on the sensing interface. The production of the diazo coupling reaction is proven with an ultraviolet–visible (UV–vis) absorption spectrum. As-synthesized Au NRs are characterized with a UV–vis absorption spectrum, transmission electron microscope, and SERS. Significantly improved SERS peaks were observed at 1114 and 1392 cm −1 , showing this method can be used to detect capsaicin and identify gutter oil. In a broad range of 10 −11 ~ 10 −4 M, the log-linear relationship between SERS intensity and capsaicin concentration is well established, with a detection limit of 3.24 × 10 −12 M.
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 9
·1-9
·
IF 6.408
Yang Fei,Wu Xiaohong,Li Chen,Chen Yuxiao,Liu Shu,Zhang Cuiling,Xian Yuezhong
A new coordination polymer (Ce-Fe-GMP) with excellent catalytic activity was prepared by a facile route, which was further applied to the detection of F − with high sensitivity and selectivity. The simple doping of Fe 3+ into the coordination network can easily modulate the mixing ratio of Ce 3+ and Ce 4+ in the presence of H 2 O 2 , which can extremely improve the catalytic ability of Ce-Fe-GMP. Based on the synergistic effect, the Ce-Fe-GMP with dual-active sites shows better peroxidase activity than that of Ce-GMP. In addition, we found that F − can inhibit the peroxidase activity of Ce-Fe-GMP because of the coordination structure fragmentation and the regulation of Ce 3+ /Ce 4+ ratio. Therefore, different concentrations of F − can be detected by the colorimetric reaction based on this mechanism. The absorption at 652 nm displays a good linear relationship versus the concentration of F − over the range 2.0 to 100.0 μM. Furthermore, F − in real mineral-mixed samples can be measured with satisfactory results. The colorimetric strategy based on the peroxidase activity of Ce-Fe-GMP is simple and low-cost, which shows the potential applications in the field of on-site environment measurement. Graphical abstract
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高影响因子
POLYMER BULLETIN
·
2022
·Vol. 80
·期 7
·7927-7947
·
IF 2.843
Wang Qian,Zhu Sining,Xi Chen,Zhang Fan
A novel crosslinked hyperbranched polyamide-amines adsorbent (CHAP-SH) with sulfhydryl functional groups was synthesized by modifying thiourea and its selective adsorption properties for Cu (II) were studied. The adsorption of coexisting ions showed that the CHAP-SH had high adsorption capacity and selectivity for Cu (II). The adsorption characteristics and mechanism of the CHAP-SH for Cu (II) were systematically investigated. The results of shake flask adsorption experiments indicated that the adsorption procedure was well adapted to the Langmuir isotherm and pseudo-second-order kinetics models, and the maximum adsorption capacity of Cu (II) was 158.48 mg/g at pH = 5.0 and 45 ℃. The adsorption mechanism of the CHAP-SH for Cu (II) was mainly the synergistic interaction with –NH, –COO − , and –SH functional groups. After seven adsorption/desorption cycles, it could still maintain a high removal rate, which provided great potential for the development of multiple novel and reusable immobilized functional materials to efficiently isolate the Cu (II) ions.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 24
·18952-18960
·
IF 2.779
Zhang Xiao Min,Yang Xiao-Li,Wang Bin
Traditional hydrogels are easily frozen or evaporated under colder or hotter temperatures, resulting in their performance degradation. In this paper, polyacrylic acid, sodium alginate, carbon nanotubes, water, and glycerol are used to synthesize self-healing, wearable, freezing resistance, and dry resistance conductive hydrogels with interpenetrating crosslinking network structure. The dynamic cross-linking network structure of the hydrogel can rapidly recover and restructure after damage. In addition, the conductive hydrogels exhibit excellent adhesion to various materials (including PTFE, iron, glass, plastic, and skin). Conductive hydrogel has excellent strain-electric sensing properties, and has high sensitivity, significant stability and repeatability. The conductive hydrogel can be used to test the movement of fingers and knee joints by strain sensing, and has excellent, sensitive, and stable resistance response. Therefore, the conductive hydrogel can be used as a wearable strain sensor for real-time detection of human joint movement. The hydrogel has better environmental adaptability and broad application prospects.
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Science China-Materials
·
2022
·Vol. 66
·期 1
·272-283
·
IF 8.64
Wang Xinliang,Li Na,Yin Juanjuan,Wang Xiaoming,Xu Linli,Jiao Tifeng,Qin Zhihui
Conductive hydrogels based on two-dimensional (2D) nanomaterials, MXene, have emerged as promising materials for flexible wearable sensors. In these applications, the integration of high toughness, ultrastretchability, low hysteresis, self-adhesiveness, and multiple sensory functions into one gel is essential. However, serious issues, such as easy restacking and inevitable oxidation of MXene nanosheets in aqueous media and weak interfacial bindings between MXene and the gel network, make it almost impossible to achieve the multiple performances mentioned above. Here we present a conductive MXene-composited polymer (MCP) hydrogel by incorporating gelatin-modified MXene into polyacrylamide (PAAm) hydrogel for the fabrication of multifunctional sensors. The presence of gelatin not only greatly improves the stability of the MXene nanosheets by forming a protective sheath, but also largely enhances the interfacial interactions between the MXene and the hydrogel network as molecular glues. Thus, the MCP hydrogel exhibits a high strength (430 kPa), remarkable stretchability (1100%), low hysteresis (<10% at 500% cyclic tensile), and excellent repeatable adhesion. The resultant MCP hydrogel-based versatile sensors display a high strain sensitivity with a broad working range (gauge factor (GF) = 8.83, up to 1000%), realizing the detection of various human motions. Moreover, the prepared sensors possess superior thermosensitive capacities (1.110/°C) for the measurement of body temperature. This strategy opens horizons to designing high-performance MXene-based hydrogels for advanced sensing platforms.
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ARCHIVES OF TOXICOLOGY
·
2022
·Vol. 96
·期 9
·2545-2557
·
IF 6.168
Ji Di,Yu Yuejin,Zhu Qicheng,Li Xianjie,Zhong Xiali,Zhang Zhuyi,Ke Weijian,Niu Congying,Wang Can,Wu Jingwei,Chen Da,Song Maoyong,Wei Yanhong
Triphenyl phosphate (TPhP) is a non-halogenated organophosphorus flame retardant, and there is a higher exposure risk in children. TPhP has been found to be neurotoxic upon developmental exposure, yet the specific mechanism remains unclear. To characterize the cellular responses underlying TPhP-induced developmental neurotoxicity, we administered TPhP (0.5, 5 or 50 mg/kg/day) to neonatal mice from postnatal day 10 (P10)–P70. A total of 17,229 cells and 26,338 genes were identified in cortical samples from control and low-dose (the internal doses of metabolite DPhP comparable to human exposure level) groups using single-cell RNA sequencing (scRNA-seq). TPhP exposure led to heterogeneous transcriptional alterations and intercellular crosstalk among neurons, neural stem/progenitor cells (NSPCs), endothelial cells, and immunocytes. Deprivation of NSPCs, loss of mature neurons, and concomitant neuroinflammation mediated by extrinsic and intrinsic immunocytes were found in TPhP-exposed cortices. In addition, we observed blood–brain barrier destruction prior to the anxiety/depression-like neurobehavioral changes. These results reveal the distinctive cellular processes in TPhP’s neurodevelopmental toxicity and uncover that the impeded neurogenesis, disrupted vascular barrier, and concomitant neuroinflammation are the sensitive responses to TPhP exposure. Our study paves the way for the application of scRNA-seq in toxicity assessments for emerging neurotoxic pollutants.
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Chinese Medicine
·
2022
·Vol. 17
·期 1
·1-12
·
IF 4.546
Wu Ding-Tao,Yuan Qin,Feng Kang-Lin,Zhang Jinming,Gan Ren-You,Zou Liang,Wang Shengpeng
Background Rheum tanguticum is utilized as one of the well known traditional Chinese medicine for the treatment of gastrointestinal diseases. Recently, R. tanguticum polysaccharides (RP) have received increasing attention due to their diversely pharmacological activities. Usually, the pharmacological activities of polysaccharides are closely correlated to their metabolic properties from the stomach to the intestine. However, the digestive behavior and fecal fermentation characteristics of RP are unknown, which need to be fully investigated. Methods In this study, an in vitro simulated gastrointestinal model was carried out for the investigation of the digestive behavior and fecal fermentation characteristics of RP. The possible changes in physicochemical properties of RP, such as molecular weight, monosaccharide composition, reducing sugar released, chemical composition, pH value, and short chain fatty acids, were determined during in vitro simulated digestion and human fecal fermentation, and its effect on the modulation of gut microbial composition was also evaluated. Results The results revealed that RP was indigestible under the in vitro simulated digestion conditions according to its stabilities in physicochemical properties. Conversely, the indigestible RP (RPI) could be notably utilized by colonic microbiota in human feces after the in vitro fermentation, especially, at the initial fermentation stage (0–6 h). The fecal fermentation characteristics of RPI were revealed. Results showed that the content of reducing sugars obviously increased from 0.177 to 0.778 mg/mL at the initial stage of fermentation, and its molecular weight notably declined from 2.588 × 10 5 to 0.828 × 10 5 Da at the end stage of fermentation. Notably, the utilization of arabinose and galactose in RPI by colonic bacteria was faster than that of galacturonic acid. Besides, RPI could obviously modulate gut microbial composition via promoting the relative abundances of several beneficial bacteria, such as genera Bacteroides , Bifidobacterium , and Megamonas , resulting in the promoted production of several short-chain fatty acids, such as acetic, propionic, and butyric acids. Conclusions Results from this study showed that RP was indigestible in the human upper gastrointestinal tract in vitro, but could be easily utilized by colonic microbiota in human feces at the initial stage of fermentation. RP could be used as potential prebiotics for the improvement of intestinal health.
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高影响因子
Scientific Reports
·
2022
·Vol. 12
·期 1
·1-10
·
IF 4.996
Ren Tongyan,Feng Chengmin,Dong Jun,Zhu Hong,Wang Bing
Implant-associated infections limit the clinical application of implants therapy; hence, exploiting strategies to prevent biomaterial-associated infections has become important. Therefore, in this study, a series of poly (p-dioxanone) (PPDO)-coated Ag loading TiO 2 nanoparticles (Ag@TiO 2 -PPDO) was synthesized to be applied as bacteriostatic coating materials that could be easily dispersed in organic solvent and coated onto implantable devices via temperate methods such as electrospraying. The lattice parameters of TiO 2 were a = 0.504 nm, b = c = 1.05 nm, alpha = beta = gamma = 90 degree and the size of crystallite was about 13 nm, indicating that part of Ag has been embedded into crystal defects of TiO 2 . Both XRD and TEM determinations indicated the successful grating of PPDO on the surface of Ag@TiO 2 . Among Ag@TiO 2 nanoparticles with various Ag loading quantities, 12% Ag@TiO 2 nanoparticles exhibited relatively higher grafting efficiency and Ag contents on the surface of grafted composites. In addition, 12% Ag@TiO 2 -PPDO exhibited the best bacteriostatic effect in vitro owing to its higher grafted efficiency and relatively short length of PPDO segments. Subsequently, Ag@TiO 2 -PPDO was coated on the surface of a poly lactic-co-glycolic acid (PLGA) electrospun membrane via the electrospraying method. Finally, the in vivo bacteriostatic effect of 12% Ag@TiO 2 -PPDO coating was verified by implanting 12% Ag@TiO 2 -PPDO-coated PLGA membrane into a rat subcutaneously combined with an injection of Staphylococcus aureus at implanting sites.
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高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 12
·6783-6796
·
IF 6.123
Yu Shimo,Zhao Xinfu,Zhang Jing,Liu Sijia,Yuan Zhipeng,Liu Xiaochan,Liu Benxue,Yi Xibin
High CO 2 concentration in atmosphere causes serious environmental issues, and carbon capture and storage technologies have attracted attention as a means to reduce the atmospheric CO 2 concentration. Metal-organic frameworks (MOFs) can potentially be used for CO 2 adsorption, but their poor stability and microporosity limit their applications. Herein, a novel strategy was proposed to combine a cellulose aerogel and hierarchically-porous MOFs (HP-MOFs) with larger pores. According to this strategy, a series of microcrystalline cellulose/HP-UIO-66-NH 2 hybrid aerogels (MC-HUN-X) was constructed by adding a modulator (monocarboxylic acid, MA), followed by the in-situ growth of HP-UIO-66-NH 2 on a cellulose aerogel. By adjusting the chain length of MA, the structure–function relationship between pore size and the CO 2 adsorption capacity of MC-HUN-X was explored. The results showed that the CO 2 adsorption capacity increased first and then decreased upon increasing the MOFs pore size, while the adsorption selectivity of CO 2 continuously increased. Among all samples, MC-HUN-4 with a moderate pore size had the highest CO 2 adsorption capacity (1.90 mmol/g at 298 K and 1 bar) and adsorption selectivity (13.02 and 2.40 for CO 2 /N 2 and CO 2 /CH 4 ). The combination with a cellulose aerogel endowed MC-HUN-X with excellent mechanical stability and reusability. Graphical abstract Cellulose/HP-UIO-66-NH 2 hybrid aerogel with larger aperture sizes of MOF showed excellent adsorption capacity and selectivity for CO 2 , and the combination with aerogel could effectively improve the mechanical stability and reusability.
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Nano-Micro Letters
·
2022
·Vol. 14
·期 1
·1-16
·
IF 23.655
Qiu Chen,Qian Kun,Yu Jun,Sun Mingzi,Cao Shoufu,Gao Jinqiang,Yu Rongxing,Fang Lingzhe,Yao Youwei,Lu Xiaoqing,Li Tao,Huang Bolong,Yang Shihe
For electrochemical CO 2 reduction to HCOOH, an ongoing challenge is to design energy efficient electrocatalysts that can deliver a high HCOOH current density ( J HCOOH ) at a low overpotential. Indium oxide is good HCOOH production catalyst but with low conductivity. In this work, we report a unique corn design of In 2 O 3- x @C nanocatalyst, wherein In 2 O 3- x nanocube as the fine grains dispersed uniformly on the carbon nanorod cob, resulting in the enhanced conductivity. Excellent performance is achieved with 84% Faradaic efficiency (FE) and 11 mA cm −2 J HCOOH at a low potential of − 0.4 V versus RHE. At the current density of 100 mA cm −2 , the applied potential remained stable for more than 120 h with the FE above 90%. Density functional theory calculations reveal that the abundant oxygen vacancy in In 2 O 3- x has exposed more In 3+ sites with activated electroactivity, which facilitates the formation of HCOO* intermediate. Operando X-ray absorption spectroscopy also confirms In 3+ as the active site and the key intermediate of HCOO* during the process of CO 2 reduction to HCOOH.
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Biomass Conversion and Biorefinery
·
2022
·
IF 4.05
Qu Qiang,Guo Xiaohui,Shao Zhijiang,Wang Xiuzhang,Zhu Mingqiang,Qiu Ling
Zanthoxylum branch became agricultural waste without proper utilization, and the pristine biochar (PB) had the limited removal capacity of Cr(VI) (21.75 mg g −1 ). In this study, zanthoxylum branch was fabricated to modified biochar (MZB) through impregnating with 0.4, 0.6, 0.8, and 1.0 mol L −1 Fe (NO 3 ) 3 solution and then pyrolyzing at 500 and 900 ℃. After sieving by batch adsorption experiment of Cr(VI), the optimal MZB was prepared with impregnating solution concentration of 0.4 mg L −1 and pyrolysis temperature of 900 ℃ (900MZB4), and displayed the outstanding Cr(VI) removal capacity (110.43 mg g −1 ). Besides, the effect of initial solution pH was evaluated, and removal process of Cr(VI) was a reaction of consuming protons. The fitting results of Langmuir model and pseudo-second-order kinetic model confirmed that the Cr(VI) removal reaction was a homogeneous chemisorption. Thermodynamic parameters demonstrated that the adsorption of Cr(VI) was an endothermic spontaneous process. The results of SEM and XRD suggested that zero-valent iron (Fe 0 ) particles were located on 900MZB4 surface and participated in the removal reaction of Cr(VI). The XPS analysis indicated 78.37% of Cr(VI) was reduced to Cr(III) by the cooperation of oxygen-containing functional groups (OFG) and Fe 0 . More OFG and higher surface area (130.36 m 2 g −1 ) revealed by FTIR and BET also contributed to the better characteristic of 900MZB4. In addition, 900MZB4 maintained removal efficiency at 81.22% after sixth regeneration cycles. Therefore, it is feasible to prepare high-efficient adsorbent from zanthoxylum branch for wastewater treatment. Graphical abstract
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2022
·Vol. 29
·期 8
·1-11
·
IF 3.061
Zhang Yunfei,Wang Xilun,Luo Lu,Huang Yongchun,Li Kai,Li Jianbin
In this work, A new composite material composed of cellulose nanocrystals (CNCs) and waterborne polyurethane (WPU) was prepared. The thermal stability and mechanical properties of composites were studied. Compared with composites with CNCs without acylation treatment, the composites with modified CNCs by acylation reagents exhibited better thermal stability and mechanical properties. In addition, CNCs modified by butyric anhydride in composites demonstrated excellent mechanical properties. When 1.00% of CNCs modified by butyric anhydride were added to WPU, the fracture stress of the resulting composite material reached 52.15 MPa, which was 1262% higher than that of WPU (3.81 MPa), and 157% higher than that of the composite 1% CNCs without acylation treatment (20.31 MPa). This preparation of CNCs-WPU composites with better performance on thermal and mechanical properties provides guidelines for further improving the application of WPU.
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危险品化学品经营许可证（带存储）