JOURNAL OF POLYMER RESEARCH
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2020
·Vol. 27
·期 8
·1-10
·
IF 2.426
Han Shuo,Peng Yanyan,Tao Shengyun,Hu Ying,Lan Tianqi,Hu Chengkang,Cao Jing
In this work, a kind of chiral helical polymer PDTDH of 9,9-dipropynylfluorene skeleton structure were prepared. The structure and chiral properties of the obtained polymer were characterized by Nuclear Magnetic Resonance (NMR) and Circular Dichroism (CD) Spectroscopy. These chiral PDTDH polymers were used to fabricate chiral sensors and to investigate the enantioselective recognition of D−/L- tartaric acid enatiomer. The results indicated that the (S)-PDTDH/GCE sensor showed obvious response toward the tested tartaric acid enantiomer, which was confirmed by two parameters: Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) tests. These findings expand the scope for the application of chiral polymer as electrode modification material in the electrochemical chiral recognition field.
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Nano-Micro Letters
·
2020
·Vol. 12
·期 1
·1-15
·
IF 12.264
Liu Siyang,Hu Fangyuan,Shao Wenlong,Zhang Wenshu,Zhang Tianpeng,Song Ce,Yao Man,Huang Hao,Jian Xigao
2D MXenes are attractive for energy storage applications because of their high electronic conductivity. However, it is still highly challenging for improving the sluggish sodium (Na)-ion transport kinetics within the MXenes interlayers. Herein, a novel nitrogen-doped Ti 3 C 2 T x MXene was synthesized by introducing the in situ polymeric sodium dicyanamide (Na-dca) to tune the complex terminations and then utilized as intercalation-type pseudocapacitive anode of Na-ion capacitors (NICs). The Na-dca can intercalate into the interlayers of Ti 3 C 2 T x nanosheets and simultaneously form sodium tricyanomelaminate (Na 3 TCM) by the catalyst-free trimerization. The as-prepared Ti 3 C 2 T x /Na 3 TCM exhibits a high N-doping of 5.6 at.% in the form of strong Ti–N bonding and stabilized triazine ring structure. Consequently, coupling Ti 3 C 2 T x /Na 3 TCM anode with different mass of activated carbon cathodes, the asymmetric MXene//carbon NICs are assembled. It is able to deliver high energy density (97.6 Wh kg −1 ), high power output (16.5 kW kg −1 ), and excellent cycling stability (≈ 82.6% capacitance retention after 8000 cycles).
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EUROPEAN FOOD RESEARCH AND TECHNOLOGY
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2020
·Vol. 246
·期 10
·1909-1918
·
IF 2.366
Zhang Xiao-Hua,Ma Yi-Xin,Yi Chong,Qing Xiang-Dong,Liu Zhi,Zheng Jing-Jing,Lin Fang,Lv Tian-Feng
In this paper, the application of chemometrics coupled with high-performance liquid chromatography-diode array detection (HPLC–DAD) for the rapid and sensitive quantitative analysis of seven flavonoids in the raw and purified propolis samples was investigated. The objective of this paper was to receive a successful resolution of the complex propolis matrix with minimum experimental time (3.5 min) when appearing unknown interferences, highly overlapping peaks, time and baseline drifts among chromatograms. First, the validation samples contained seven flavonoids at five levels, helped to understand and interpret the features of the second-order calibration method based on the alternating trilinear decomposition (ATLD) algorithm. Second, the experimental data were studied for the simultaneous determination of flavonoids in the raw and purified propolis samples using the function of "mathematical separation" of ATLD algorithm. Except for myricetin (MY), the average recoveries of other analytes were 95.79–105.82% for the raw propolis samples, 94.41–108.06% for the purified propolis samples. In addition, the limit of detection (LOD, 0.01–0.20 μg mL −1 ), limit of quantification (LOQ, 0.03–0.60 μg mL −1 ), sensitivity (SEN, 15.97–184.31 mL μg −1 ), selectivity (SEL, 0.16–0.76) and root-mean-squared error of prediction (RMSEP, 0.29–1.64 μg mL −1 ) of the proposed method, demonstrated that all the target analytes have good sensitivity, low detection limit. According to the experimental results, the total content of flavonoids in purified propolis is about twice that in raw propolis, which is consistent with the actual situation. This analytical strategy will be extremely promising for the identification and quantification of analytes studied in the complex samples.
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Scientific Reports
·
2020
·Vol. 10
·期 1
·1-9
·
IF 3.998
Mei Lin,Xu Zhenlong,Shi Yanmei,Lin Chunlei,Jiao Shuyan,Zhang Lijun,Li Pengxu
Chitosan oligosaccharide functionalized silver nanoparticles with synergistic bacterial activity were constructed as a multivalent inhibitor of bacteria. Placing the chitosan oligosaccharide on silver nanoparticles can dramatically enhance the adsorption to the bacterial membrane via multivalent binding. The multicomponent nanostructures can cooperate synergistically against gram-positive and gram-negative bacteria. The antibacterial activity was increased via orthogonal array design to optimize the synthesis condition. The synergistic bacterial activity was confirmed by fractional inhibitory concentration and zone of inhibition test. Through studies of antimicrobial action mechanism, it was found that the nanocomposites interacted with the bacteria by binding to Mg 2+ ions of the bacterial surface. Then, the nanocomposites disrupted bacterial membrane by increasing the permeability of the outer membrane, resulting in leakage of cytoplasm. This strategy of chitosan oligosaccharide modification can increase the antibacterial activity of silver nanoparticles and accelerate wound healing at the same time. The nanomaterial without cytotoxicity has promising applications in bacteria-infected wound healing therapy.
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 26
·11970-11983
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IF 3.553
Niu Yingchun,Li Xueai,Dong Wenqi,Zhang Can,Zhao Kuihu,Wang Fengyan,Wang Haiyan
Carbon and iron composites have drawn much attention for their unique electromagnetic properties. In addition, nitrogen doping of carbon can effectively modulate the dielectric properties of carbon. Therefore, synthesis of N-doped carbon and iron composites is an alternative method for obtaining high-efficiency microwave absorption materials. In previous studies, the synthesis process was very complicated including multistep routes. In this work, N-doped carbon with embedded Fe/Fe 3 C was synthesized in-situ via pyrolysis of amino phenol formaldehyde resin (APF) scattered with Fe 2 O 3 nanoparticles (APF/Fe 2 O 3 ), which was obtained through a simple hydrothermal process. During the heat-treatment process, the APF resin was converted into N-doped carbon, and simultaneously, the Fe 2 O 3 was reduced to iron nanoparticles. Then, inevitably, the iron nanoparticles reacted with carbon to form Fe 3 C at the interface between the iron particles and carbon. Taking advantage of multiple heterogenous interface, the interfacial polarization relaxation could be enhanced. Therefore, the N-doped carbon with embedded Fe/Fe 3 C particles displays microwave absorption with a maximum reflection loss of − 70 dB. Moreover, the effective absorption bandwidth (reflection loss of less than − 10 dB) reaches 6.02 GHz at a thickness of 2.13 mm. This study not only provides composites of N-doped carbon with embedded Fe/Fe 3 C particles with excellent stable microwave absorption but also offers a simple method for synthesizing N-doped carbon with embedded Fe/Fe 3 C particles.
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MICROCHIMICA ACTA
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2020
·Vol. 187
·期 8
·1-9
·
IF 6.232
Tang Gangxu,Liu Wei,Chen Zhaoxia,Huang Po-Jung Jimmy,Qin Xiaojiao,Xu Shuxia
An ultrasensitive 1 O 2 -based electrochemical aptasensor by on-line assembly of photosensitizers using graphene oxide (GO) as a cartridge is reported. In the presence of target protein lysozyme, the interaction of lysozyme with aptamer led to the dissociation of dsDNA and release of the aptamer-lysozyme complex to solution, with DNA-c retaining on the electrode; then, the photosensitizer phloxine B (PB) was assembled on the electrode since GO can simultaneously adsorb DNA-c and PB molecules. Upon irradiation by a green LED, 1 O 2 was generated by photocatalysis of PB molecules and then cleaved the DNA-c, leading to remarkably decreased impedance signals that linearly respond with the logarithm of lysozyme concentration. Benefitting from the efficient photosensitization ability of PB and the high PB-loading capacity of GO, the developed sensor allowed determination of 0.001 to 100 nM lysozyme with a limit of detection of about 0.14 pM. The relative standard deviation (RSD) for five independent electrodes with 1 nM lysozyme was 3.1%, indicating satisfactory reproducibility. The sensor also showed excellent selectivity toward lysozyme in the presence of interfering substances and was applied to the determination of lysozyme in urine samples with recoveries ranging from 91 to 101%. The on-line assembly of photosensitizer technique opens a new way for amplified electrosensing of biomolecules.
An on-line assembly of photosensitizers and DNA on electrode was developed using graphene oxide a cartridge and the photocatalytic electrosensor can be used for label-free detection of lysozyme as low as 1 pM.
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COLLOID AND POLYMER SCIENCE
·
2020
·Vol. 298
·期 9
·1263-1271
·
IF 1.536
Wei Yan-Chan,Xia Jie-Hui,Zhang Ling,Zheng Ting-Ting,Liao Shuangquan
Dipping product of natural rubber (NR) latex has superior comprehensive properties superior to those made from synthetic latex. Compared with synthetic latex, the component characteristics of NR show the existence of non-rubber components (NRC). In this paper, NRC, mainly proteins and phospholipids, are separately removed by enzyme treatment to study their effect on the film formation behavior of natural rubber latex. The changes of NR latex particles are in situ visualize by using freeze-drying SEM technology and AFM during the film formation process. The results demonstrate that contact, deformation, and coalescence of latex particles occur more readily after the removal of proteins and phospholipids. It shows that removing NRC can quicken NR film formation. However, the mechanical properties of the NR film decrease in the absence of NRC. Based on the research, a film formation mechanism for NR latex is proposed, which can provide a more insightful understanding toward the structure-property relationship of NR film.
Graphical abstract
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Nature Communications
·
2020
·Vol. 11
·期 1
·1-14
·
IF 12.121
Xu Shujuan,Zheng Huizhen,Ma Ronglin,Wu Di,Pan Yanxia,Yin Chunyang,Gao Meng,Wang Weili,Li Wei,Liu Sijin,Chai Zhifang,Li Ruibin
Sustainable developments of nanotechnology necessitate the exploration of structure-activity relationships (SARs) at nano-bio interfaces. While ferroptosis may contribute in the developments of some severe diseases (e.g., Parkinson’s disease, stroke and tumors), the cellular pathways and nano-SARs are rarely explored in diseases elicited by nano-sized ferroptosis inducers. Here we find that WS 2 and MoS 2 nanosheets induce an iron-dependent cell death, ferroptosis in epithelial (BEAS-2B) and macrophage (THP-1) cells, evidenced by the suppression of glutathione peroxidase 4 (GPX4), oxygen radical generation and lipid peroxidation. Notably, nano-SAR analysis of 20 transition metal dichalcogenides (TMDs) disclosures the decisive role of surface vacancy in ferroptosis. We therefore develop methanol and sulfide passivation as safe design approaches for TMD nanosheets. These findings are validated in animal lungs by oropharyngeal aspiration of TMD nanosheets. Overall, our study highlights the key cellular events as well as nano-SARs in TMD-induced ferroptosis, which may facilitate the safe design of nanoproducts.
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Journal of Natural Medicines
·
2020
·Vol. 75
·期 1
·37-47
·
IF 2.055
Han Jieru,Shi Guangyu,Li Wenhao,Xie Ying,Li Fuzhen,Jiang Deyou
Monosodium urate (MSU)-mediated inflammation is closely related to gouty arthritis (GA). Dioscin, an active ingredient, has been reported to possess anti-inflammatory property. Nevertheless, the role of dioscin in GA and the underlying mechanism have not been fully understood. In the present study, we investigated the anti-inflammatory effect of dioscin on MSU-induced GA through in vivo and in vitro experiments. Histopathological analysis showed that dioscin alleviated the severity of GA concomitant with the lowered uric acid and creatinine levels. Moreover, the increasing IL-1β, IL-6, and TNF-α levels induced by MSU were decreased via administration of dioscin in mice and human synoviocytes. Western blotting results suggested that dioscin inhibited the activation of NLRP3 through down-regulating the protein expressions of NLRP3, apoptosis-associated speck-like protein containing a caspase recruitment domain (ASC), cleaved-caspase-1, as well as IL-1β. In addition, TLR4, myeloid differentiation primary response gene 88 (MyD88), p-IKKβ, p-p65, and NF-κB p65 in nuclei levels were significantly reduced by dioscin. Importantly, dioscin remarkably lowered the NF-κB p65-DNA activity in MSU-treated mice utilizing electrophoretic mobility shift assay (EMSA) analysis. Taken together, dioscin had a protective effect against MSU-initiated inflammatory response via repressing the production of inflammatory cytokines and the activation of inflammasome NLRP3 and TLR4/NF-κB signaling pathway. The above findings revealed that dioscin could be a potential drug for the treatment of GA.
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Journal of Food Measurement and Characterization
·
2020
·Vol. 14
·期 6
·3184-3193
·
IF 1.648
Jiang Yingfen,Sun Da-Wen,Pu Hongbin,Wei Qingyi
This study aimed to propose a novel surface-enhanced Raman spectroscopy (SERS)-based aptasensor by using 4-mercaptobenzoic acid (4-MBA) modified gold@silver core-shell nanoparticles (Au@Ag NPs) for detecting kanamycin for the first time with outstanding sensitivity and selectivity in the real milk samples. To achieve a high SERS activity substrate, the Au@Ag NPs with uniform shapes in a diameter of 32.2 ± 3.4 nm were synthesized successfully by seed-mediated growth and then modified with the Raman reporter 4-MBA. Under the optimal conditions, this aptamer sensing system exhibited a linear range between 6.67 × 10 − 10 g/mL and 2 × 10 − 7 g/mL with the limit of detection (142 pg/mL) of kanamycin. Moreover, the KANA-specific aptamer endowed a good specificity to this biosensor for the negative interference from other analogues (streptomycin sulfate, gentamicin sulfate, and penicillin). Finally, the aptasensor was applied in the artificially contaminated milk (1–100 ng/mL) samples and compared with the HPLC-MS technique, with the result indicating great practicality of the aptasensor. This paper has provided a potential aptasensor for simple and rapid trace-sensing of the harmful antibiotic residue in milk.
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CELLULOSE
·
2020
·Vol. 27
·期 13
·7475-7488
·
IF 4.21
Song Quancheng,Zhan Zeying,Chen Binxia,Zhou Zehang,Lu Canhui
Polypyrrole (PPy) has received extensive attention in supercapacitor electrodes due to its promising electrochemical activity, while the poor cycling stability and densely packed structure limited its electrochemical performance. Herein, we demonstrate the fabrication of flexible and freestanding PPy@bacterial cellulose (BC)/MXene composite film with significantly enhanced electrochemical performance. PPy nanoparticles were uniformly deposited on BC nanofibers via in situ polymerization, and assembled with highly conductive MXene (Ti 3 C 2 T x ) nanoflakes through strong interfacial interactions. BC as a biological template can effectively disperse PPy nanoparticles. The intercalation of PPy@BC nanofibers into Ti 3 C 2 T x layers constructs hierarchically packed nanofibrous structure, which provides extensive accessible electrochemical active sites. Freestanding PPy@BC/Ti 3 C 2 T x (PBM) electrode exhibits superior specific capacitance (gravimetric and areal capacitance of up to 550 F g −1 and 879 mF cm −2 , respectively) and excellent capacitance retention of 83.5% after 10,000 cycles. In addition, the symmetric supercapacitor assembled by PBM papers present a high energy density of 33.1 W h kg −1 (power density of 243 W kg −1 ) and excellent capacitance retention. The elaborately designed nanostructure and PPy-Ti 3 C 2 T x hybridization make great contribution to the enhanced electrochemical performance, which provide a feasible method for the fabrication of conductive polymer-based high-performance flexible supercapacitor electrodes. Graphic abstract
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2020
·Vol. 37
·期 5
·776-783
·
IF 2.69
Liu Xinghao,Hu Shuheng,Xu Di,Shao Dadong
Uranium (VI), as a toxic contaminant, is a potential detriment to human health and environmental safety. In this experiment, carboxymethyl cellulose/Ca-rectorite composite material (Ca-REC/CMC) was prepared by crosslinking reaction to remove U(VI) from the liquid. The crystal structure was detected by X-ray diffraction (XRD) and surface structure and morphology of the materials were investigated by scanning electron microscopy (SEM). The surface functional groups of prepared materials were detected by Fourier transform infrared spectroscopy (FT-IR). The adsorption capacity of Ca-REC/CMC improved obviously after being modified by CMC. The adsorption capacity of Ca-REC/CMC was closely related to ionic strength and pH. According to thermodynamic parameter calculation, the adsorption process was endothermic and spontaneous. Adsorption isotherms could be depicted perfectly by the Langmuir model. Ca-REC/CMC maintained stability and regeneration after recycling six times. The adsorption mechanism, including electrostatic interactions and ionic interaction, was investigated by the X-ray photoelectron spectroscopy (XPS). Ca-REC/CMC is considered as remarkable potential material for removing U(VI) from the water environment.
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