ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2019
·Vol. 411
·期 28
·7511-7518
·
IF 3.286
Wu Yang-yang,Liu Bo-wen,Huang Pengcheng,Wu Fang-Ying
A label-free, rapid response colorimetric aptasensor for sensitive detection of chloramphenicol (CAP) was proposed, which was based on the strategy of ssDNA-modified gold nanoparticle (AuNP) aggregation assisted by lanthanum (La 3+ ) ions. The AuNPs generated a color change that could be monitored in the red, green, and blue and analyzed by the smartphone imaging app. La 3+ , as a trigger agent, strongly combined with the phosphate groups of the surface of ssDNA-AuNPs probe, which helps create AuNP aggregation and the color change of AuNPs from red to blue. On the contrary, when mixing with CAP, the aptamer (Apt) bound to CAP to form a rigid structure of the Apt-CAP complex, and La 3+ attached to the phosphate groups of the complex, which prevented the aptamer from binding to the surface of the AuNPs. As a result, the color of the AuNPs changed to violet-red. Finally, UV-vis absorption spectroscopy and the smartphone imaging app were employed to determine CAP with a lower detection limit of 7.65 nM and 5.88 nM, respectively. The proposed strategy featuring high selectivity and strong anti-interference ability for detection of CAP in practical samples was achieved. It is worth mentioning that the simple and portable colorimetric aptasensor will be used for facilitating on-site detection of food samples.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2019
·Vol. 94
·期 1
·186-194
·
IF 1.986
Wang Qiuhua,Wang Huiying,Wu Yaling,Cheng Lingping,Zhu Lunan,Zhu Junchen,Li Zhidong,Ke Yanxiong
Sub 2-μm monodisperse mesoporous silica spheres (MMSS) were synthesized using a mixed template system in a MeOH/H 2 O solution. 1-Dodecylamine (DDA) and polymeric type Jeffamine surfactants, including D2000, D4000, and T5000, were employed as templates. These mixed template syntheses realized to gain MMSS materials with good spherical shape and uniform particle size. When the MeOH/H 2 O (v/v) ratio was controlled between 2.5:1 and 3.0:1, mesoporous silica spheres of 2.10–2.35 μm with excellent dispersibility can be obtained. Depending on the surfactant chain length of Jeffamine, hydrothermal aging pH (4–9), time (12–24 h), and temperature (80–140 °C), MMSS with large-pore sizes (up to 14.3 nm), surface areas (153–791 m 2 /g), and pore volumes (0.47–1.28 cm 3 /g) can be synthesized.
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MICROCHIMICA ACTA
·
2019
·Vol. 187
·期 1
·1-8
·
IF 5.479
Xi Ying,Du Yingxiang,Sun Xiaodong,Zhao Shiyuan,Feng Zijie,Chen Cheng,Ding Wen
A monolithic capillary column was prepared by single-step copolymerization of the ionic liquid 1-vinyl-3-octylimidazolium bromide (VOI) and styrene. The VOI and styrene monomers were introduced to provide multiple interaction sites and increase hydrophobicity and aromaticity of the monolithic column, respectively. The effect of porogen ratio, monomer ratio and reaction temperature on permeability was investigated. The resulting column was characterized by scanning electron microscopy, and the results suggest that the column possesses high porosity and good homogeneity. A relatively strong anodic electroosmotic flow was generated over a wide range of pH values (pH 2.0–10.0), and this facilitates the rapid separation of analytes within 12 min. Alkylbenzenes, polycyclic aromatic hydrocarbons (PAHs), proteins and amino acids were used to evaluate the performance of the monolithic column under capillary electrochromatography mode by UV detection. Mixed-mode retention mechanisms including hydrophobic interaction, π-stacking, ion-exclusion interaction were observed. The monolithic column exhibits high column efficiency (8.72 × 10 4 plates∙m −1 ) and satisfying separation capability (the resolution of four alkylbenzenes: 2.54, 2.86 and 4.62, four PAHs: 2.79, 4.83 and 4.77, three proteins: 4.35 and 2.86, two amino acids: 3.34).
Schematic representation of capillary electrochromatography (CEC) systems with ionic liquid and styrene based organic polymer monolithic column for separation of alkylbenzenes, polycyclic aromatic hydrocarbons, proteins and amino acids.
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Science China-Technological Sciences
·
2019
·Vol. 62
·期 12
·2236-2242
·
IF 2.18
Ge Bo,Ren GuiNa,Zhao PengFei,Jin ChuanYu,Li WenZhi,Zhang ZhaoZhu
Sewage discharge produced by homes and industries contains both oil and water-soluble components. In order to remove oil from water, materials with specific wettability can be used; however, these materials cannot remove dissolved contaminants from water. In this research, we prepared a superhydrophobic CdS cotton for water purification. This material has the ability to adsorb different types of oil due to its non-wettability (WCA = 152°). Moreover, its response behavior towards visible light enables it to remove water-soluble pollutants as well. The highest oil absorption rate of superhydrophobic CdS cotton is nearly 30 times, and it can absorb light below 564 nm and produce •OH to degrade water soluble pollutants. Finally, based on Mott-Schottky curve, the position of Fermi energy level was determined (−0.55 eV). Also, the positions of valence and conduction bands were calculated based on the analysis of band gap which helps in proving photoelectric response characteristics.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2019
·Vol. 411
·期 27
·7187-7196
·
IF 3.286
Zhang De,Liang Pei,Ye Jiaming,Xia Jing,Zhou Yongfeng,Huang Jie,Ni Dejiang,Tang Lisha,Jin Shangzhong,Yu Zhi
Surface-enhanced Raman spectroscopy (SERS) has the potential to detect pesticide residues in agricultural products. However, some systemic pesticides, such as chlorpyrifos, can enter the plant tissue, and not just stay on the surface. Consequently, many SERS studies halted at practical application because of its complexity. In this work, SERS technology was used to detect chlorpyrifos residues in tea products at the semiquantitative level. A simple pretreatment method effectively avoided interference of other fluorescent substances, and all major peaks could be distinguished on the basis of a novel substrate. A principal component analysis algorithm was applied to form a regression model, and a nanogram detection limit was obtained. Furthermore, chlorpyrifos residues in the same tea products were also measured by gas chromatography–mass spectrometry, and the results show a small range of errors. From the comparative study of the two detection methods, the results suggest the great promise of SERS technology for rapid inspection of agricultural products.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 12
·1-7
·
IF 5.479
Li Shuhuai,Ma Xionghui,Pang Chaohai,Tian Hai,Xu Zhi,Yang Yan,Lv Daizhu,Ge Huilin
A fluorometric assay is described for the determination of Cd(II) in environmental and agricultural samples. It is making use of a molecularly imprinted polymer (MIP) and aptamer as dual recognition units, while carbon quantum dots (co-doped with sulphur and nitrogen) and gold nanoparticles (SN-CQD/Au) act as the fluorophores. The aptamer-modified MIP was placed on an SN-CQD/Au-modified indium tin oxide glass electrode. Cd(II) was detected with high selectivity by the recognition sites of the aptamer in the MIP. Fluorescence, with excitation/emission peaks at 370/430 nm, is quenched by Cd(II). Response is linear in the 20 pM to 12 nM concentration range. The detection limit is 1.2 pM. The sensor is selective for Cd(II), and recoveries from spiked waters, soils and vegetables real-world samples range between 82.1 and 113.9%.
A fluorescence sensor composed of a molecularly imprinted polymer and an aptamer as a dual identification system for Cd 2+ coupled with and carbon quantum dots (co-doped with sulphur and nitrogen) and gold nanoparticles (SN-CQDs/Au) as fluorescent element that can detect Cd 2+ with high selectivity by a dual-recognition mechanism.
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JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2019
·Vol. 28
·期 12
·7213-7226
·
IF 1.476
Yang Ming,Jia Zhengfeng,Pang Xianjuan,Shao Xin,Zhen Jinming,Zhang Ran,Ni Junjie,Jiang Jinlong,Yu Bo
In this paper, polydopamine/silver (PDA/Ag) nanoparticles were easily synthesized. Then, the PDA/Ag nanoparticles were sprayed on copper substrate and heat-treated under argon to get carbonized PDA/Ag (CPDA/Ag) composite films. Transmission electron microscopy, field-emission scanning electron microscopy, x-ray diffraction, Raman spectroscopy and x-ray photoelectron spectroscopy were employed to investigate the conversion of PDA and AgNO 3 into CPDA and Ag,
respectively. Results showed that the PDA/Ag composite films heat-treated at 500 °C had much better friction reduction and anti-wear properties than other samples. The tribofilms containing C, N, O, Ag and Cu played an important role on reducing friction and increasing wear resistance.
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BIOLOGICAL TRACE ELEMENT RESEARCH
·
2019
·Vol. 197
·期 2
·580-590
·
IF 2.431
Zhang Jian,Huang Wanyue,Xu Feibo,Cao Zheng,Jia Fubo,Li Yanfei
Aluminum (Al) alters iron regulatory factors content and leads to the changes in iron-related proteins causing iron accumulation. But limited evidence ascertains this hypothesis. Therefore, our experiment was conducted and four groups of male Wistar rats were orally administrated of 0, 50, 150, and 450 mg/kg BW/d aluminum chloride (AlCl 3 ) for 90 days by drinking water, respectively. The cognitive function, pathological lesion of hippocampus, oxidative stress, as well as iron-related proteins and iron regulatory factors expression were detected. The results showed that AlCl 3 remarkably induced the oxidative stress and pathological lesion in the hippocampus and impaired the learning-memory ability. The contents of Al and iron increased in all AlCl 3 -exposed groups. Meanwhile, the increased divalent metal transporter 1 (DMT1) expression enhanced iron import and the decreased ferroportin 1 (Fpn1) expression reduced iron export in AlCl 3 -exposed groups. The iron accumulated and ferritin heavy chains (Fth) expression decreased in all AlCl 3 -exposed groups led to an increase in free iron. The study also showed that iron regulatory factor iron regulatory protein 2 (IRP2) was decreased and hepcidin was increased in AlCl 3 -exposed groups. The results indicated that AlCl 3 induces iron dyshomeostasis presenting as iron accumulation, the disordered expression of iron import, export, store, and regulatory proteins in rat hippocampus accompanied with oxidative stress, pathological lesion, and impaired learning-memory ability.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 27
·期 5
·5108-5121
·
IF 2.914
Fu Binbin,Xie Fencun
A novel cellulose microcrystalline-manganese dioxide nanocomposite (CMC-NMO) was synthesized by the redox reaction between potassium permanganate and ethanol based on cellulose microcrystalline. The cellulose microcrystalline (CMC) as support providing growth sites for the manganese dioxide nanowhiskers produced by the redox reaction and its application for Pb(II) and Cd(II) removal from aqueous was investigated. The characterization of as-synthesized material was revealed by various spectroscopic and microscopic techniques. Infrared-transform infrared (FITR) indicates that the incorporation of manganese oxide to CMC does not change the initial structure of it. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) data show that the manganese dioxide nanowhiskers with a few nanometers are uniformly dispersed on the surface of cellulose. Kinetics experiments reveal that Pb(II) and Cd(II) adsorption on CMC-NMO is a fast process and pseudo-second-order model fits the adsorption better. The maximum adsorption capacities of Pb(II) and Cd(II) obtained from the Langmuir model are 290.8 mg/g and 67.4 mg/g, respectively. The mechanism is mainly attributed to surface complexation and electrostatic attraction by energy dispersive analysis of X-rays (EDAX), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) analysis. In addition, depth removal experiments show that the residual concentrations of Pb(II) and Cd(II) in natural water after adsorption are lower than 0.01 mg/L. The regeneration and cyclic utilizing studies indicate that CMC-NMO has good adsorption stability. Therefore, the results indicate that this material can be employed as a potential adsorbent for current serious Pb(II) and Cd(II) pollution caused by industrial emissions.
Graphical abstract
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2020
·Vol. 142
·期 3
·1287-1294
·
IF 2.731
Wang Jiawei,Sui Zifeng,Zheng Yifei,Wang Tao,Zhang Yongsheng,Xu Hong,Pan Wei-Ping
As one of the technologies for the improvement in coal quality, biological enzyme technology has received much attention. The enzyme product named 3EC was shown to enhance the power plant performance in our previous full-scale test. In this work, its effect on coal was explored. The results indicated that the enzyme product was beneficial in the removal of organic sulphur from coal, and the catalytic action of 3EC on the cleavage of C–C and C–S bonds was proven based on data from the dibenzothiophene decomposition test. Thus, when it was used to treat coal, the CH 3 -to-CH 2 ratio changed from 0.81 to 0.32 with an increase in treatment time, which indicated that some chemical structures in the enzyme-treated coal changed. Because of these structural changes, the combustion behaviour of coal improved, indicated by the increase in the comprehensive combustion index from 2.958 × 10 6 to 3.113 × 10 6 % 2 min −2 K −3 and the decrease in activation energy from 32.76 to 30.43 kJ mol −1 . In addition, the optimum enzyme treatment time should be 4 days to ensure enough reaction time between the enzyme and the coal.
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Applied Nanoscience
·
2020
·Vol. 10
·期 6
·1845-1851
·
IF 2.88
Wang Tianxiong,Jiang Tiancai,Meng Xianquan
We found that the morphology of nanowires could be regulated by adding polyvinylpyrrolidone (PVP, K30) in hydrothermal synthesis of antimony sulfide (Sb 2 S 3 ) nanowires. The nanowires with length more than 20 μm were obtained by adding the proper amount of PVP. Three kinds of fully nanostructured photodetector using Sb 2 S 3 nanowires as active regions were fabricated and the first detector used silver nanowires as the electrodes at both ends, the second used silver nanowires as one electrode and MXenes as the another electrode, and the third used MXenes as both electrodes. The light response speed of the photodetector with both MXenes electrodes was improved greatly. The photodetector which used MXenes and silver nanowires as electrodes at two ends, respectively, showed the phenomenon of being self-driven. The mechanism of asymmetric hole migration was put forward to explain the effect of being self-driven.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2019
·Vol. 21
·期 10
·1-13
·
IF 2.009
Wang Xueqin,Ouyang Fan,Cui Liuqing,Xiong Tiandi,Guan Xinglei,Guo Yuqi,Duan Shaofeng
Maghemite (γ-Fe 2 O 3 ) nanoparticles (NPs) emerging as an artificial enzymes have demonstrated an excellent peroxidase-like activity and thus gained much attention in various biological and medical applications. But naked γ-Fe 2 O 3 NPs are aqueously instable and prone to aggregation in biological solutions such as blood plasma. Surface coating for γ-Fe 2 O 3 NPs is thus necessitated to achieve better stability and biocompatibility. In this work, three typical coating layers including poly(lactic-co-glycolic acid) (PLGA), carboxymethyl chitosan (CMCS), and human serum albumin (HSA) were utilized as modifiers to decorate γ-Fe 2 O 3 NPs and fabricate compound NPs including NP PLGA , NP CMCS , and NP HSA , respectively, and subsequently, the peroxidase-like activity of these NPs was evaluated with colorimetric analysis of cholesterol detection. The results showed that the surface coating barely affected peroxidase-like activity of NPs but could remarkably amend stability in the determined pH and temperature ranges. As evidenced with kinetic parameters, the enzymatic catalysis of NPs accorded well with Michaelis–Menten kinetics. Moreover, the catalytic assay demonstrated that the fabricated NP PLGA , NP CMCS , and NP HSA showed a capable catalytic activity using cholesterol as substrate, and especially, the NP PLGA showed a higher peroxidase-like activity compared with the NP CMCS and NP HSA . In conclusion, herein we obtained a coating layer-modulated peroxidase-like activity of γ-Fe 2 O 3 NPs for a visualized analysis of cholesterol, which could be extended for cholesterol detection in biomedical analyses in the future.
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