ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2020
·Vol. 412
·期 8
·1807-1816
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IF 3.637
Hu Xin,Liu Man,Liu Yifei,Zhang Jingjing,Tang Yuwen,Pei Hong,Liu Hegang,Chen Shilin,Song Chengwu,Hu Zhigang
Herbal materials have both medicinal and commercial values. As such, accurate species and content identification and verification are necessary to ensure the safe and effective use for medical and commodity purposes. Herein, we introduce a two-step approach for systematic identification and quality evaluation of wild and introduced Anemone flaccida Fr. Schmidt (aka Di Wu) using DNA barcode and ultra-performance liquid chromatography quadrupole time-of-flight mass spectrometry (UPLC-QTOF-MS/MS). To begin, a precise and rapid identification method based on internal transcribed spacer 2 (ITS2) sequence was developed to ensure the authenticity of ‘Di Wu’ species. Next, the major active components were fully characterized utilizing a targeted profile of oleanane-type triterpenoid saponins, which was established via UPLC-QTOF-MS/MS. As a result, 34 oleanane-type triterpenoid saponins were identified or characterized in ‘Di Wu.’ The qualitative and relative quantitative analysis showed obvious differences between wild and introduced ‘Di Wu.’ Furthermore, dynamic changes in the contents of triterpenoid saponins throughout various harvesting periods were clearly explained and mid-April was identified as the appropriate harvest time. Moreover, results indicate that the contents of five main saponins (anhuienoside E, glycosideSt-I4a, hemsgiganoside B, flaccidoside II, and hederasaponin B) are more appropriate as a quality evaluation indicator than the current quality standard. The two-step approach provides a suitable strategy to evaluate the genuine quality of wild and introduced ‘Di Wu,’ and can be applied to the targeted analysis of other triterpenoid saponin analogues for quality evaluation.
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INTERNATIONAL JOURNAL OF CARDIOVASCULAR IMAGING
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2020
·Vol. 36
·期 5
·841-854
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IF 1.969
Bi Liangliang,Zhang Huaxing,Han Ruoling,Chen Wei,Zhao Na
This study compared the potential ability of multinomial echocardiographic parameters in early detection, prediction and combined diagnosis of antineoplastic-related cardiotoxicity. Male Balb/c mice were repeatedly administered with low doses of epirubicin (6 × 3 mg/kg; n = 20) to induce cardiac injury or with placebo as control ( n = 10). Conventional and strain parameters as well as myocardial performance index (MPI) were analyzed at baseline, 1 day after the second, fourth and sixth cycle, and 12 days after completion of chemotherapy (as follow-up) by a high-resolution rodent ultrasound machine. After the experiment, serum cTnI levels were measured, and myocardial injury was evaluated by histological analyses. Thirteen mice developed cardiotoxicity after epirubicin exposure. Global longitudinal (GLS), radial strain (GRS) and longitudinal strain rate (LSR) were markedly decreased (all P ≤ 0.01) and MPI was increased ( P ≤ 0.05) at the completion of treatment compared with baseline values. GLS expressed the best correlations with myocardial pathological injury, especially with collagen content (ρ = − 0.68, P < 0.01). Additionally, GLS and MPI were associated with serum cTnI levels. A > 9.5% decrease in GLS from baseline to the fourth cycle of chemotherapy could predict future cardiotoxicity (odds ratio = 0.331, P < 0.05). GLS (cutoff value, − 15.16%) combined with MPI (cutoff value, 0.64) could improve the accuracy of diagnosing cardiotoxicity (sensitivity, 92%; specificity, 87%). GLS was the only predictor of cardiotoxicity. GLS combined with MPI may provide a noninvasive and accurate method for the early detection of cardiotoxicity.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 20
·17461-17473
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IF 2.22
Bhattacharya Anish,Zhang Yin,Wu Haiyan,Chu Xiangfeng,Dong Yongping,Liang Shiming,Xu Jiaqiang,Chakraborty Amit K.
Due to its importance in human health and environmental monitoring, ethanol sensing has generated large research interest across the globe. In this work, we report a simple co-precipitation method to synthesize La-doped BaSnO 3 and evaluate its ethanol sensing properties. Electron microscopy and X-ray diffraction analyses revealed formation of crystalline BaSnO 3 having rod-like shape, few microns in length and 1–2 µm in width. The optimal sensing performance was achieved when operated at 220 °C for 4 wt% La-doped BaSnO 3 microrods for which a response as high as 48 was obtained against 100 ppm of ethanol exposure, whereas the undoped BaSnO 3 exhibited its best performance (although much lower response) at 260 °C. Multiple characterization techniques revealed that the enhancement of the sensor performance by incorporation of La was due to changes in the physico-chemical properties like specific surface area, oxygen content and electronic bandgap of the BaSnO 3 . The high repeatability, high selectivity to ethanol, fast response and recovery times, and low detection limit of 0.01 ppm suggest good potential for the 4% La-doped BaSnO 3 film as a low cost ethanol sensor.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 8
·1-11
·
IF 6.232
Qu Fei,Wang Bingjie,Li Kexin,You Jinmao,Han Wenli
The aggregates of glutathione-capped CuNCs induced by Al 3+ (named CuNCs@Al 3+ complexes) show a stable aggregation-induced emission (AIE) for about 1 month. Their fluorescence maintains a high level in the pH range 4.0 to 7.0, while it quenches as pH increases from 7.0 to 7.7 or decreases from 4.0 to 3.0. Under urease-catalyzed hydrolysis, urea produces ammonia, which can be further hydrolyzed to yield OH − . This leads to a pH increase of the immediate environment. Hence, the CuNCs@Al 3+ complexes are a suitable probe to determine urea. The fluorescence of CuNCs@Al 3+ complexes quenches linearly at 585 nm with the excitation wavelength at 340 nm when the concentration of urea increases from 20 to 150 μM. The limit of detection (LOD) of urea is 5.86 μM. This sensitivity is superior to other reported works due to the narrow pH response range of CuNCs@Al 3+ complexes. This method has been successfully applied for measuring urea in human urine samples with satisfactory recoveries.
Schematic representation of urea determination based on pH-responsive property of copper nanoclusters@Al 3+ complexes. Ammonia is produced in the hydrolysis of urea by urease, and it is further hydrolyzed to yield OH − , leading to increasing pH of the environment.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 30
·37839-37851
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IF 3.056
Xu Jun,Xu Jinmei,Jiang Shanqing,Cao Yu,Xu Kailin,Zhang Qiuya,Wang Liping
In this work, a novel visible light–driven heterostructure Ag 3 PO 4 /MIL-100(Fe) composite photocatalyst was successfully synthesized via facile chemical deposition method at room temperature. Especially when the mass ratio of Ag 3 PO 4 was 20% of MIL-100(Fe) (APM-2), it displayed the best photocatalytic performance, for which the degradation rate of tetracycline (TC) in conventional environment was 6.8 times higher than that of bare MIL-100(Fe). In addition, the effects of the initial concentration and pH of the solution on the degradation of tetracycline were also studied, and the results showed that the degradation of tetracycline was more favorable in a weakly alkaline environment. The excellent performance of Ag 3 PO 4 /MIL-100(Fe) composites was attributed to the fact that on the basis of having adequate photocatalytic active sites, modifying MIL-100(Fe) with an appropriate amount of Ag 3 PO 4 particles can more effectively separate photogenerated electron–hole pairs. Five cycles of experiments showed that APM-2 has good photostability. Lastly, it was proved through quenching experiments that •O 2 − , h + , and •OH all played corresponding roles in the degradation process, and a possible Z-scheme heterostructure photocatalytic degradation mechanism was proposed.
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Journal of Analysis and Testing
·
2020
·Vol. 4
·期 4
·264-272
·
IF 0
Jiang Li-Ping,Li Na,Liu Lin-Qi,Zheng Xian,Du Fu-You,Ruan Gui-Hua
Abstract Polymerized high internal phase emulsion (polyHIPE) monoliths were prepared and applied as adsorbent materials for solid-phase extraction (SPE) of malachite green (MG) and leucomalachite green (LMG) from water samples. The polyHIPE monoliths were prepared by post-functionalization of monolithic surface with 6-aminocaproic acid (ACA) via ring opening reaction of epoxy groups in glycidyl methacrylate (GMA)-based polyHIPEs, and then applied to the preconcentration and determination of trace MG and LMG in environmental water samples by combing with high-performance liquid chromatography (HPLC). Taking MG and LMG as targets, main factors affecting SPE performance of the polyHIPE monoliths were investigated. Under the optimized conditions, the ACA-functionalized polyHIPE monoliths could effectively preconcentrate MG and LMG from 150 mL of water samples, and the recoveries of MG and LMG at three spiked levels were ranged from 84.8 to 97.4% with the relative standard deviations (RSDs) lower than 6%. The proposed method exhibited good linearity in the range of 2–200 ng mL –1 , with low limits of detection of 17.0 and 8.7 pg mL –1 for MG and LMG, respectively. In addition, the prepared ACA-modified polyHIPE monolith showed good durability and stability, and it could be reused for 200 cycles without obvious losing the extraction performance. Graphic abstract
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 31
·15140-15151
·
IF 3.553
Lian Jiqiong,Wu Yihui,Sun Jingjing
Developing highly efficient and inexpensive bifunctional electrocatalysts is a grand challenge in water splitting process. In this article, NiFe electrocatalysts on nickel foam are prepared by electrodeposition method using high current density. The optimized NiFe electrocatalyst presented excellent electrocatalytic activities in 1.0 M KOH medium with low overpotentials of 100 mV for hydrogen evolution reaction and 230 mV for oxygen evolution reaction to achieve 10 mA·cm −2 , respectively. Moreover, the optimized NiFe electrocatalyst as bifunctional electrocatalyst toward overall water splitting only needs a small cell voltage of 1.57 V to obtain 10 mA·cm −2 . The extremely electrocatalytic performance of NiFe electrocatalyst is attributed to the fast charge transfer kinetics, large electrochemical surface area, and the conductive nickel foam.
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Nanoscale Research Letters
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2020
·Vol. 15
·期 1
·1-8
·
IF 3.578
Ben Jianwei,Song Zhiyuan,Liu Xinke,Lü Wei,Li Xiaohua
Abstract The flexible and rechargeable energy storage device with excellent performance is highly desired due to the demands of portable and wearable devices. Herein, by integrating the bendability and stretchability of Polyvinyl alcohol (PVA), pseudocapacitance of Polyaniline (PANI), and the charge transport ability of carbon nanotubes (CNTs), PVA/CNT/PANI flexible film was fabricated as supercapacitor electrodes with excellent electrochemical performance and flexibility. Full-solid supercapacitor is prepared based on PVA/H 2 SO 4 gel electrolyte and as-prepared film electrodes. The device achieves an areal capacitance of 196.5 mF cm -2 with high cycling stability. The flexible properties of PVA, the conductivity of CNT, and the pseudo-capacitance of PANI contribute to the superior performance. Present work develops a facile and effective way for preparing flexible electrode materials. Graphical Abstract In present work, we fabricated PVA/CNT/PANI flexible film as supercapacitor electrodes with excellent electrochemical performance and flexibility.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 6
·1-11
·
IF 6.232
Wang Jinping,Wang Xiaoyu,Pan Xiaohua,Pan Wei,Li Ye,Liang Xiangyu,Sun Xiaobo
Dual-emission carbon dots were synthesized by one-pot hydrothermal pyrolysis of citric acid and polyethyleneimine in the presence of rhodamine B at 160 °C for 5 h. The carbon dots have an average diameter of 2.51 nm with rhodamine moiety on their surface. Two emission bands centered at 447 and 581 nm are exhibited in their fluorescence spectra excited at 360 nm, and the former is sensitive while the latter is insensitive to Hg 2+ and pH. Glutathione (GSH) can recover the fluorescence quenched by Hg 2+ . Therefore, the dual-emission carbon dots were developed as a fluorescent ratiometric probe employing the ratio of the two intensities at 447 and 581 nm ( R I447/I581 ) as the signal for the determinations of pH, Hg 2+ , and GSH. In the range of 5.0–10.0, a good linear relationship between R I447/I581 and pH was built with a regression equation of R I447/I581 = 11.95–0.56 pH ( R 2 = 0.998). In the range from 0.0 to 8.0 μM, an excellent linear relationship between R I447/I581 and the concentration of Hg 2+ was obtained with a calibration equation of R I447/I581 = 6.2317–0.4458c ( R 2 = 0.995) and a limit of detection (LOD) of 0.24 μM. In the range from 1.0 to 10.0 μM, a linear equation, R I447/I581 = 1.9133–0.4157c ( R 2 = 0.995), was calibrated between R I447/I581 and the concentration of glutathione with a LOD of 0.27 μM. The recoveries for the determinations of Hg 2+ and GSH in real samples were in the ranges of 94.6 to 103.8% and 94.3 to 104.2%, respectively.
Dual-emission carbon dots achieved by luminescence center modulation within one-pot synthesis for a fluorescent ratiometric probe of pH, Hg 2+ , and glutathione
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 6
·1-8
·
IF 6.232
Liang Pei,Cao Yu,Dong Qianmin,Wang Dan,Zhang De,Jin Shangzhong,Yu Zhi,Ye Jiaming,Zou Mingqiang
Simple and traditional hydrothermal fabrication of a novel balsam pear-shaped CuO with high SERS enhancement is presented. XRD (X-ray diffraction), SEM (scanning electronic microscopy), TEM (transmission electron microscope), HRTEM (high-resolution transmission electron microscope), UV-Vis, and Raman are adopted to ensure that this balsam pear-shaped CuO with dense nanoparticle protuberance is successfully prepared. The LOD of this CuO SERS substrate is 4.79 μg L −1 with R6G as molecular probe. By using DFT (density functional theory) calculation and FDTD (finite difference time domainmethod) simulation, both EM (electromagnetic enhancement) and CM (chemical enhancement) mechanisms are investigated, and the results show that these two-enhancement mechanisms can coexist in this balsam pear-shaped CuO. Finally, the prepared substrate has been applied for the determination of trace levels of paraquat in solution , and results show that its LOD for paraquat is 275 μg L −1 (optimum Raman band: 1646 cm −1 Raman shift), which is better than the government standard in China. A dexterous and facile way for fabrication of CuO SERS-active substrates with low cost and high performance, quite promising in detection of chemically hazardous substances and pesticide residue is provided.
Graphical abstract
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APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2020
·Vol. 191
·期 3
·1340-1352
·
IF 2.277
Su Yanbin,Sun Chengyu,Sun Xuwei,Wu Ruixue,Zhang Xing,Tu Yunzhou
The aim of this study was to explore whether or not acetylresveratrol as a potential substitute for resveratrol dragged the toxic aldehyde to inhibit the mutation of mitochondrial DNA. The results revealed that the acetylresveratrol shifted ultraviolet peak of trans -crotonaldehyde from 316 to 311 nm. In mitochondria, the acetylresveratrol split the ultraviolet peak at 311 nm of trans -crotonaldehyde into 311 nm and 309 nm; the aldehyde Raman band of trans -crotonaldehyde was red shifted by the acetylresveratrol from 1689 to 1686 cm −1 with obvious band decline; Raman bands at 1149 cm −1 , 1168 cm −1 , and 1325 cm −1 of acetylresveratrol disappeared. In aldehyde dehydrogenase, the aldehyde Raman band of trans- crotonaldehyde was red shifted by the acetylresveratrol from 1689 to 1684 cm −1 with band decline; Raman bands at 1150 cm −1 , 1168 cm −1 , and 1324 cm −1 of acetylresveratrol declined. The weak acidic microenvironment was the best, for the acetylresveratrol dragged the toxic aldehyde of trans -crotonaldehyde. Compared with the resveratrol, the effect of the acetylresveratrol on the toxic aldehyde of trans -crotonaldehyde was very similar to that of the resveratrol. The acetylresveratrol is very suitable as a potential substitute for resveratrol dragged the toxic aldehyde to inhibit the mutation of mitochondrial DNA.
In mitochondria, the Raman band of the toxic –CH=O of trans- crotonaldehyde (TCA) dragged by the Acetyl-Res from 1689 to 1686 cm −1 with obvious band decline, while the Raman bands at 1149 cm −1 , 1168 cm −1 , and 1325 cm −1 of the Acetyl-Res disappeared, respectively. The Acetyl-Res is very suitable as a potential substitute, for the Res dragged the toxic –CH=O of TCA to inhibit the mutation of mitochondrial DNA for anticancer.
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JOURNAL OF ELECTRONIC MATERIALS
·
2020
·Vol. 49
·期 4
·2529-2538
·
IF 1.774
Zhang Pengfei,Liu Yanxia,Chai Fengtao,Fan Yameng,Hou Aolin
Li 4 Ti 5 O 12 (LTO) composites modified with carbon nanotubes (CNTs) and carbon coating (LTO@C/CNTs) were synthesized by a simple solid-state reaction. The carbon-coated layers reduce the growth of the primary particles, inhibit interface side reactions and increase electron conductivity, so CNTs-modified LTO can form a conductive network and improve the diffusion path of lithium ions. The LTO@C/CNTs composites show a high-rate capability (150 mAh g −1 at 10 C, 145 mAh g −1 at 20 C) with good cycling performance (90.1% and 82.8% capacity retentions after 1000 cycles at 10 C and 20 C, respectively). In addition, superior electrochemical performance is also demonstrated in a full cell with a LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) cathode and LTO@C/CNTs anode (97.1% capacity retentions after 200 cycles at 1 C). The carbon coating and CNTs-modified in LTO can reduce the polarization of potential difference and charge-transfer resistance, improve the diffusion coefficient of lithium ions, and lead to high rate performance and cycle stability.
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