JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Amjad Farid,Lujun Pan,Muhammad Usman,I.A. Khan,Abdul Sammed Khan,Aqrab ul Ahmad,Muhammad Javid
The combination of transition-metals with chalcogens provide a platform for developing highly sensitive and stable electro-catalyst materials possessing excellent electrochemical features regarding glucose oxidation . The growth of porous cobalt telluride (CoTe 2 ) nanosheets (NSs) on a three-dimension (3D) nickel foam (NF) scaffold via anion-exchange transformation is achieved by employing low temperature scalable hydrothermal process. Being an active catalyst material for glucose detection, the CoTe 2 NSs/NF electrode demonstrates an ultra-prompt response time of 0.1 s, boosting sensitivity of 168000 μA mM −1 cm −2 , low limit of detection of 0.59 μM along with excellent anti-interference ability and favorable stability. Besides, the effective electrochemical performance of sensing electrode is recognized with respect to the glucose detection in real human blood serum. Overall, this material guarantees free-standing 3D architecture, interconnected porous NSs morphology, large specific surface area, high conductivity, and appealing electro-catalytic activity. Therefore, the porous CoTe 2 NSs/NF binder-free electrode has a great application prospect as a promising biomimetic catalyst material for highly sensitive and efficient non-enzymatic glucose sensor.
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MATERIALS CHEMISTRY AND PHYSICS
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2020
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IF 3.408
Tao Guo,Ting Xu,Wentao Xia,Andrew J. Carrier,Li Wang,Xu Zhang
We report herein, double quantum dot composites of graphene oxide and CuO (GOQD-q-CuO), formed by a low-temperature solution process, possess enhanced haloperoxidase (HPO)-like catalytic activity, which catalyze the oxidation of Cl − by H 2 O 2 to generate reactive chlorine species (RCS). A sensitive and selective colorimetric sensor was then developed via the oxidation of 3,3ʹ,5,5ʹ-tetramethylbenzidine (TMB) by the GOQD-q-CuO catalytic system through the generation of RCS for H 2 O 2 and glucose detection, with detection limits of 0.5 and 2.5 μM and linear ranges between 2.5–200 and 5–400 μM, respectively. This sensor was further applied to glucose detection in clinical serum samples showing no significant differences with the hexokinase method. Additionally, we demonstrate that the GOQD modulates the catalytic activity of q-CuO by reversing its zeta potential , producing an overall negatively charged surface, therefore GOQD-q-CuO has much higher affinity than CuO to the positively charged chromogenic substrate TMB, yielding higher HPO-like activity. Moreover, the presence of Cl − accelerates electron transfer to facilitate Cu 2+ reduction to Cu + on the GOQD-q-CuO surface, speeding up the overall catalytic reaction for the RCS generation, therefore, higher detection sensitivity was achieved.
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LWT-FOOD SCIENCE AND TECHNOLOGY
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2021
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IF 4.952
Weiping Jin,Yijun Pan,Yi Wu,Chunling Chen,Wei Xu,Dengfeng Peng,Qingrong Huang
Camellia oleifera seed oil contains nearly 80% oleic acid , which accounts for health-benefits, and it is stored in the subcellular oil bodies (OBs) organelles. To utilize C. oleifera OBs as a dietary supplement of unsaturated fatty acid , the physical properties need to be investigated. The physical stabilities of extracted OBs against ionic strength (0.01–1M) and temperature (30–90 °C) were evaluated via Turbiscan analysis and confocal microscope. The results showed that OBs extracted at alkaline conditions (pH 9.0–11) exhibited uniform dispersion. The surface charge of the OBs decreased dramatically with increasing NaCl content, and OBs droplet aggregation occurred under a NaCl concentration of 0.1 mol/L. Moreover, high temperature (up to 90 °C) had a positive effect on OBs stability. Overall, OBs extracted under alkaline pH were more stable than those extracted under neutral pH. Differences in the interfacial proteins of OBs extracted at the neutral and alkaline pHs were studied via sodium dodecyl sulfate-acrylamide gel electrophoresis (SDS-PAGE) and liquid chromatography-tandem mass spectrometry (LC-MS/MS). Six types of oleosins, including Ole Ⅲ, the fragment of Ole Ⅱ, oleosin, Ole Ⅳ, Ole Ⅴ, and Ole Ⅰ, were found in the extracted membrane proteins. Oleosins and some coextracted endogenous proteins played a certain role in OBs stability.
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IN VITRO CELLULAR & DEVELOPMENTAL BIOLOGY-PLANT
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2021
·Vol. 57
·期 3
·372-379
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IF 2.252
Li Xiuyu,Zhang Zijie,Ren Yunhui,Feng Yue,Guo Qi,Dong Li,Sun Yuhan,Li Yun
Tetraploid black locust ( Robinia pseudoacacia L.) has advantages over diploid varieties in growth and stress resistance. Previous studies had shown that tetraploid black locust can be induced only by treating shoot tips of the germinating seeds with colchicine. In order to establish a simpler and more efficient tetraploid induction method in black locust, we induced tetraploid plants by treating the hypocotyls from in vitro –grown seedlings with different concentrations of colchicine, and then provided a method for tetraploid identification based on stomatal size and density in this study. The highest induction efficiency was 53.33% by treating hypocotyl explants with 70 mg·L −1 colchicine for 2 d. Tetraploid black locust was significantly different from diploid in morphological characteristics. Leaf area, leaf thickness, chlorophyll content, stomatal length, and stomatal width were greater in tetraploid plants than in diploid plants, whereas the opposite was true for leaf aspect ratio, stomatal index, and stomatal density. The differences in stomatal size and density between diploid and tetraploid were nearly two times; therefore, size and density of stomata can be used as a stable and distinct marker to rapidly screen tetraploids. The results of this study suggested that the hypocotyl was an ideal material to induce tetraploid black locust in vitro and confirmed that stomatal size and density could be an effective and reliable marker to identify ploidy level in black locust.
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Drug Testing and Analysis
·
2020
·Vol. 13
·期 3
·720-728
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IF 2.903
Cui-Mei Liu,Hong-Yuan He,Lin Xu,Zhen-Dong Hua
Performing fast qualitative identification of seized illegal drugs by Raman spectroscopy is challenging due to fluorescence interference as well as chemical complexity. Spectrometers with 785-nm excitation, 1,064-nm excitation, and sequentially shifted excitation (SSE) were compared for their effect on fluorescence reduction. The characteristic peaks method, which is independent of cutting agents, was tested as a new strategy to broaden the application of the Raman technique. The suitability of the characteristic peaks method was fully examined by analyzing a large amount of seized illegal drugs, including 72 methamphetamine hydrochloride (concentration range of 13.9%–99.4%), 68 ketamine hydrochloride (17.7%–99.8%), 176 heroin hydrochloride (5.2%–79.5%), 51 cocaine hydrochloride (21.1%–94.5%), and 33 cocaine base (30.9%–92.5%) samples. The results showed that seized methamphetamine, ketamine, and cocaine samples had no or little fluorescence. Hence, in regard to detection of these samples, the advantage of using 1,064-nm excitation and SSE compared with 785-nm excitation was quite limited. Regarding the heroin samples, a significant improvement of the “high” confident positive detected rate was evident for 1,064 nm excitation (60.8%) and SSE (61.4%), compared with 785-nm excitation (13.1%). However, it was also seen that even if 1,064-nm excitation and SSE were applied, the fluorescence of heroin samples was still unable to be fully overcome. By using the characteristic peaks method, low LOD results of 5%–20% were acquired for 40 types of drug mixtures, and lower LODs were obtained for the 60% of the drug mixtures compared with library searching method. Raman spectroscopy in conjunction with the characteristic peaks method was shown to be fast, simple, accurate, and sensitive in the qualitative analysis of seized drug samples.
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PubMed
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2020
·
IF 4.495
Youlin Jiang,Dewei Ni,Bowen Chen,Jun Lu,Feiyan Cai,Xuegang Zou,Chunjing Liao,Hongda Wang,Shaoming Dong
In this work, 3D-C f /HfC-SiC-based composites were fabricated and optimized via reactive melt infiltration (RMI) of Si into porous C f /HfC-C preforms prepared by a sol-gel processing. The physical and chemical processes involved during the fabrication were identified and analyzed in details. It is revealed that fibers and interphase of the composites can be eroded during carbothermal reduction process, which can be further aggravated during RMI, with the formation of Hf-containing substance on the fibers surface. The fibers and interphase degradation is mainly induced by the reactions between HfO 2 and C/SiC interphase layers at elevated temperatures. Accordingly, a two-step carbothermal reduction treatment was proposed for the optimization of the fabrication procedure. As a result, less fiber/interphase erosion and improved mechanical properties are achieved in the composites, with the bending strength increased by ∼49 % (from 214.1 ± 15.7 MPa to 319.0 ± 26.0 MPa).
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INDUSTRIAL CROPS AND PRODUCTS
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2021
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IF 5.645
Ming-Zhao Xiao,Rui Sun,Zhi-Yan Du,Wen-Bin Yang,Zhuohua Sun,Tong-Qi Yuan
Cadmium (Cd) contaminant in soil can pollute crops and poison consumers higher in the food chain. Sorghum ( Sorghum bicolor (L.) Moench) is a promising bioenergy crop that can absorb and accumulate Cd from soil while generate renewable biomass resources for bioethanol or other valuable products, and limit waste production by rational utilization of all components. In this study, a sustainable agricultural strategy was presented and six sorghum cultivars grown under field conditions for the phytoremediation of Cd-contaminated agricultural soil were investigated with the goal of comparing their ability to accumulate Cd and their theoretical bioethanol yields (Cd concentration in the soil was 0.25 and 0.96 ppm). Striking differences were found in the Cd accumulation of these sorghum cultivars, and the result indicated that the Cd accumulation in stalks increased with maturity. The total absorbability of Cd ranged from 19.6 to 148 g/ha, and N6G60 sorghum showed the highest Cd accumulation with a concentration of 9.16 ppm in the stalk on a dry basis. The theoretical yield of bioethanol ranged from 5510 to 7510 L/ha. The overall performance of N6G60 and 15016 sorghums surpassed that of other sorghum cultivars because of their stronger capacities for Cd translocation and higher theoretical yields of bioethanol. Considering the experimental results, as well as the potential ethanol yield and growing situations of sorghums, 15016 sorghum was considered the cultivar showing the most promise for future applications.
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JOURNAL OF MEMBRANE SCIENCE
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2020
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IF 7.183
Liang Cheng,Mengxiao Zhang,Chuanjie Fang,Weilin Feng,Liping Zhu,Youyi Xu
Loose nanofiltration (NF) membrane with pore radius approaching 1 nm and positive charges can be valuable alternative to commercial available negatively charged polyamide NF membrane in specific applications, such as removal of hardness and heavy metal ions and selective separation of dyes/salts mixture. In this work, positively charged poly( N -vinyl imidazole) (PVI) gel-filled loose NF membranes were developed by asymmetric gel-filling upon an asymmetric ultrafiltration (UF) support via UV-initiated surface grafting polymerization and post-quaternization. Compared to the polyamide NF membranes, these membranes displayed a comparable salt rejection ability due to their stronger Donnan exclusion effect. A rigorous three-parameter transport model (TPM) considering steric, Donnan and dielectric exclusion on ions partitioning via effective pore radius ( r p ), membrane charge density ( X d ) and averaged pore dielectric constant ( ε p ), was used to analyze the membrane parameters. Then the gel conformation model (GM) treating confined gel as semi-dilute polymer solution with a characteristic correlation length ( ξ ) was applied to analyze these gel composites. The results suggest that the gel polymer volume fraction ( φ ) is decisive in the gel mesh size (viewed as membrane pore size) and gel permeability. Surface porosity of the asymmetric UF base is a limiting factor in membrane permeability. The joint modelling analysis can clarify the membrane structure-properties relationship, performance limits and potentials of the gel-filled NF membrane and hence facilitate structure design and optimization.
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Materials Today Chemistry
·
2020
·
IF 0
Na Song,Sihui Chen,Di Tian,Yongxin Li,Ce Wang,Xiaofeng Lu
A facile template together with doping strategy is presented to fabricate Cu 2+ -doped polypyrrole (Cu 2+ /PPy) nanotubes (NTs) as efficient mimicking peroxidase and electrocatalyst . PPy NTs were first prepared using electrospun polyacrylonitrile nanofibers as templates and subsequently doped with Cu 2+ via a simple immersion strategy. The as-prepared Cu 2+ /PPy NTs not only exhibit an outstanding peroxidase-like catalytic efficiency but also possess an excellent electrocatalytic activity, which is used for the detection of glucose, displaying a great promise for biosensing applications. The good enzyme-like and electrochemical performances of Cu 2+ /PPy NTs are owing to the reduced Fermi level compared with bare PPy NTs, which is beneficial for promoting the electron transfer to the substrate. The novel Cu 2+ /PPy NTs are a novel type of enzyme mimics and electrocatalysts for potential bright applications in biotechnology and environment science.
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BIOSENSORS & BIOELECTRONICS
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2020
·
IF 10.257
Bingfang Wang,Yuanyuan Luo,Lei Gao,Bo Liu,Guotao Duan
Accurate detection of glucose is essential for the diagnosis of diabetes, wherein effective and sensitive biosensors for glucose detection are needed. Here, we fabricated a glucose sensor based on field-effect transistor (FET) with bimetallic nickel-copper metal-organic frameworks (Ni/Cu-MOFs) as its channel layers which were grown in-situ through a simple one-step hydrothermal method and modified with glucose oxidase (GOD) by using glutaraldehyde (GA) as linkers. Due to the synergistic effect of Ni ions and Cu ions in MOFs, the sensor (GOD-GA-Ni/Cu-MOFs-FET) showed good field effect performance and great responses to glucose through enzymatic reactions . It displayed a piecewise linear relationship in the wide range (1 μM–20 mM), and provided high sensitivity (26.05 μAcm −2 mM −1 ) in the low concentration (1–100 μM) and a low detection limit (0.51 μM). The sensor also had these advantages of high specificity, excellent reproducibility, good short-term stability and fast response time. Especially, it is indicated that the Ni/Cu-MOFs-FETs with high performance have the potential to be available sensors, paving the way for the application of bimetallic MOFs in biosensing.
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JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Yu-Jie Shen,Qing-Ran Kong,Li-Feng Fang,Ze-Lin Qiu,Bao-Ku Zhu
Nanoscale permeation channels are a key factor for molecules or/and ions separation in membrane field. In this work, molecular deposition strategy is designed to construct high-performance nanochannel separation layer for selective separation of small molecules. Herein, octaammonium polyhedral oligomeric silsesquioxane (8NH 3 Cl-POSS) and tannic acid (TA), two kinds of multifunctional molecules with a size of about 1 nm, were used to prepare robust and perm-selective composite membrane through covalently-bonded layer-by-layer (LbL) self-assembly method. The optimized TA-POSS composite membrane exhibited a narrowed pore size distribution from 0.3 to 1.6 nm with a high water permeance of 21 L m −2 h −1 bar −1 . The membrane showed desirable rejection of antibiotics (>90%) and enabled to separate them from NaCl solution. In addition, TA-POSS composite membrane showed outstanding stability due to the high degree of crosslinking between TA and 8NH 3 Cl-POSS and their rigid structures. This work gives a novel and green strategy to construct nanochannel composite membranes, which can efficiently separate molecules and salt.
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ANALYTICAL LETTERS
·
2020
·
IF 1.467
Meijuan Ren,Huan Wang,Yuanyuan Liu,Qin Ma,Wenjing Jia,Mingzhu Liu,Huiju Wang,Yongchang Lu
Amino-MIL-53(Al) nanosheets were synthesized by a hydrothermal reaction and were employed as a fluorescent probe because of their high quantum yield and excellent stability. The amino-MIL-53(Al) nanosheets have a maximum fluorescence emission peak at 435 nm using an excitation wavelength of 335 nm. The fluorescent intensity of luminophor at 435 nm was linearly quenched when mercury (II) (Hg2+) was added, which occurred due to the adsorption of Hg2+ onto the luminophor surface. Under these conditions, the fluorescent signal of the system is in the “turn-off” state. Following the addition of glutathione (GSH) into the system, the quenched fluorescence intensity may be partially restored based on the reaction between glutathione and Hg2+. In this condition, the fluorescent signal of the amino-MIL-53(Al)-Hg2+ system is in the “turn-on” state. Therefore, the amino-MIL-53(Al) nanosheets were successfully used as a “turn-off-on” fluorescent sensing system to determine the concentrations of Hg2+ in Tibetan medicine and glutathione in rabbit serum. A good correlation coefficient was obtained between the quenching of the fluorescence intensity of luminophor and the concentration of Hg2+ using the optimized conditions. A linear range was acquired from 1.96 nM to 38.27 μM with a detection limit of 0.23 nM of Hg2+ based upon a signal-to-noise ratio of three. For glutathione, the linear dynamic range was from 210 nM to 15.25 μM with a detection limit equal to 8.11 nM based upon a signal-to-noise ratio of three. This developed sensor system has the advantages of high selectivity, favorable sensitivity and simple operation for the determination of Hg2+ and glutathione in real samples.
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