Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Songtao Cai,Jinman Wu,Yaokun Mo,Yuxuan Dai,Peng Liu,Jianxin Luo,Chunyan Zhang,Yifei Liu,Jianjun Liu,Qingwen Zhang,Fuming Du,Yi Wang,Hu Chen
A two-pot method is reported for the synthesis of ferric oxide-gluconic acid/β-cyclodextrin (Fe 3 O 4 -GA@β-CD). The proposed approach is a green one as the raw material is a natural product (sucrose) and no organic solvent is involved. Meanwhile, this novel composite was demonstrated for catalytic degradation of p-nitrophenol (PNP), a prototype toxic with high toxicity and low degradability. This is realized by H 2 O 2 activation induced by the heterogeneous Fenton-like catalysis of the as-prepared Fe 3 O 4 -GA@β-CD nano-microspheres. The results showed that the reaction rate constants of PNP degradation catalyzed by Fe 3 O 4 -GA@β-CD and Fe 3 O 4 -GA were 0.0879 and 0.0514 min −1 , respectively, suggesting improved catalytic performance of Fe 3 O 4 -GA@β-CD compared with Fe 3 O 4 -GA. This can be attributed to the cavity of β-CD, which can capture and include PNP molecules. The effects of pH value, H 2 O 2 concentration, catalyst load and hydroxyl radical quenching on the Fenton-like catalysis were explored and the optimized conditions (pH value = 2.0, H 2 O 2 concentration = 50 mM, and catalyst load = 1.0 g/L) were determined. Additionally, Fe 3 O 4 -GA@β-CD exhibited excellent reusability (catalytic degradation rate = 95.1% after five recycling times) as it can be recycled under external magnetic field owing to its good magnetic response (up to 18.41 emu/g).
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2023
·
IF 5.8
Xi Lan,Junchen Zhuo,Linpin Luo,Hao Sun,Yanmin Liang,Jianxing Feng,Rui Shu,Yuechun Li,Tianyu Wang,WenTao Zhang,Jianlong Wang
A tannate-iron network-derived peroxidase-like catalyst loaded with Fe ions on carbon nitride (C 3 N 4 ) was reported for detection of total antioxidant capacity (TAC) in food in this study. Metal-phenolic networks (MPNs) was employed to form a low coordination compound on C 3 N 4 , and calcined catalyst formed hollow structure with abundant and uniform Fe sites and surface folds. CN-FeC exhibited significant peroxidase-like activity and high substrate affinity. The homogeneous distribution of amorphous Fe elements on the C 3 N 4 substrate provides more active sites, resulting in provided excellent catalytic activity to activate H 2 O 2 to 1 O 2 and O 2 ·– . The established CN-FeC/TMB/H 2 O 2 colorimetric system can detect AA in the concentration range of 5-40 μM, with the detection limits of 1.40 μM, respectively. It has good accuracy for the detection of vitamin C tablets, beverages. Taken together, this work shows that metal-phenolic networks can be an effective way to achieve efficient utilization of metal atoms and provides a promising idea for metal-phenolic networks in nanoparticle enzyme performance enhancement.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2023
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IF 4.4
Li Huang,Shangying Qin,Kun Yang,Yuanjin Xu,Xiaocui Wu,Zhongwei Lin,Yilin Wang
The core/shell Au@MnO 2 nanoparticles (Au@MnO 2 NPs) were prepared and characterized by UV–vis spectrum, transmission electron microscopy (TEM) and X-ray photoelectron spectrum (XPS). It was found that MnO 2 in the shell of Au@MnO 2 NPs could oxidize thiamine (VB 1 ) into blue fluorescent thiochrome (TC). The reduction of MnO 2 in the shell layer could lead to a decrease of Au@MnO 2 NPs size along with a blue shift of the localized surface plasmon resonance (LSPR) peak. Once ascorbic acid (AA) was introduced, MnO 2 in the shell was rapidly reduced to Mn 2+ ions. Accordingly, the oxidation of VB 1 was inhibited and the fluorescence of TC was weakened. Based on these phenomena, we have established a dual signal method for AA determination with the help of UV–vis and fluorescence spectrophotometer. Under the optimum conditions, the LSPR absorption peak shift (Δ λ ) of Au@MnO 2 NPs and the decrease in fluorescence of TC correlated well with AA concentration ranging from 0.75 to 17.5 μM. The detection limits of LSPR absorption assay and fluorescence assay were 0.18 and 0.47 μM, respectively. More importantly, this dual-signal detection method has been used for the determination of AA in vitamin C tablets with high accuracy and precision, indicating its promising potential applications.
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ANALYTICAL BIOCHEMISTRY
·
2023
·
IF 2.9
Qiao Lv,Pei-Yu Jiang,Jun-Mei Xia,Long-Hui Liang,Bo Chen,Yang Yang,Long Yan,Hui-Lan Yu,Chang-Cai Liu
The retrospective detection of organophosphorus nerve agents (OPNAs) exposure has been achieved by the off-site analysis of OPNA-human serum albumin (HSA) adducts using mass spectrometry-based detection approaches. However, few specific methods are accessible for on-site detection. To address this, a novel immunofluorescence microfluidic chip (IFMC) testing system combining europium chelated microparticle (EuCM) with self-driven microfluidic chip assay has been established to unambiguously determine soman (GD) and VX exposure within 20 min, respectively. The detection system was based on the principle of indirect competitive enzyme-linked immunosorbent assay. The specific monoclonal antibodies that respectively recognized the phosphonylated tyrosine 411 of GD-HSA and VX-HSA adducts were labeled by EuCM to capture corresponding adducts in the exposed samples. The phosphonylated peptides in the test line and goat- anti -rabbit antibody in the control line were utilized to bind the EuCM-labeled antibodies for signal exhibition. The developed IFMC chip could discriminatively detect exposed HSA adducts with high specificity, demonstrating a low limit of detection at exposure concentrations of 0.5 × 10 −6 mol/L VX and 1.0 × 10 −6 mol/L GD. The exposed serum samples can be qualitatively detected following an additional pretreatment procedure. This is a novel rapid detection system capable of discriminating GD and VX exposure, providing an alternative method for rapidly identifying OPNA exposure.
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JOURNAL OF SOLID STATE CHEMISTRY
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2023
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IF 3.3
Bowen Zhang,Fugang Zhong,Xinchao Qiu,Jianbo Xu,Mengchen Hu,Jun Ou-Yang,Yue Zhang,Benpeng Zhu,Xiaofei Yang,Shi Chen
Hafnium carbide (HfC) whiskers were successfully synthesized by combining hydrothermal and carbothermal reduction. The precursor of HfC whiskers was prepared by the hydrothermal method, subsequently pyrolyzed, and reduced to HfC whiskers at 1500–1700 °C. The synthesis parameters of HfC whiskers at various temperatures, C/Hf molar ratios, and NaF concentrations were investigated in detail. The whiskers with diameters of 1–3 μm and lengths of 50–90 μm were prepared by pyrolyzing the precursors with a C/Hf molar ratio of 6 at 1700 °C. The experimental results and thermodynamic analysis demonstrated that the growth of HfC whiskers was governed by the vapor-liquid-solid (VLS) mechanism. Furthermore, the prepared HfC whiskers were added to the ZrB 2 -HfO 2 coatings on the surface of tungsten-rhenium substrates in different ratios to toughen the coatings. The thermal shock test results indicated that the coatings toughened with HfC whiskers had better thermal shock resistance. In particular, the maximum number of thermal shock cycles that 6%HfC W -ZH could withstand was five times higher than that of W–Re alloy and about one time higher than that of ZH coatings without HfC whiskers. The thermal shock resistance of the ZrB 2 -HfO 2 coatings was significantly improved by adding HfC whiskers.
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JOURNAL OF SEPARATION SCIENCE
·
2023
·Vol. 46
·期 20
·2300384
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IF 3.1
Zheng Jiang,Hong Wang,Miao Yu,Cheng Qu,Wei Yue,Qinan Wu
In this study, a low-cost efficient online derivatization system was developed which allows for the detection of various types of mono- and oligo-saccharides only utilizing high-performance liquid chromatography (HPLC)-ultraviolet detector (UV) system. In the proposed method, phenylhydrazine was used as the derivatization reagent and directly spiked in the mobile phase, allowing for the separation and detection of mono- and oligosaccharides in an accessible instrument system (HPLC-UV). And the online derivatization design of the proposed method has significantly reduced the potential harm of derivatization reagents to the analysts. Furthermore, critical chromatographic parameters were optimized via the Box-Behnken design strategy, culminating in the ideal response for saccharides. Finally, the methodology validation of the proposed method was conducted. The proposed method showed satisfactory linear ranges with acceptable correlation coefficients (R 2 > 0.99), outstanding accuracy (Recovery: 95.3%–105.6%), high intra-day precision (relative standard deviation [RSD]: 1.4%–7.1%) and inter-day precision (RSD: 2.0%–7.4%). The robustness and ruggedness of the proposed method were proved as the recovery values in the range of 95.0%–104.6% and 95.1%–104.8% for robustness and ruggedness, respectively. These satisfactory validation results confirm the applicability and reliability of the proposed method for the analysis of saccharides in various complex real-world samples.
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Journal of Environmental Chemical Engineering
·
2022
·Vol. 10
·期 3
·107943
·
IF 7.968
Lijuan Men,Chunyu Chen,An Liu,Siyang Yu,Jiankang Zhou,Yuxi Xie,Dianchun Ju
Capacitive deionization (CDI) is a kind of emerging desalination technology . The development of electrode materials with a high desalination rate and long life, which can be used in seawater/brine water desalination and the reduction of salty wastewater, is a research hotspot in the aspect of global water treatment. In this study, N-doped porous carbon was combined with activated carbon fibers by a green coating method to successfully prepared CDI electrode (NPC@ACF). The microstructure and electrode performance of NPC@ACF were characterized by different techniques. The specific surface area of NPC@ACF tested by BET was 1098 m 2 g −1 . The electrochemical performance of this material was studied, showing that the NPC@ACF electrode possesses a high specific capacitance of 268.90 F g −1 . At the voltage of 1.2 V, the electrosorption capacity is 14.63 mg g −1 , and the CDI desalination efficiency was increased by 39% and 63% compared with that of pure ACF or NPC, respectively. The NPC@ACF material has good recyclability showing a desalination efficiency retention rate of 27% after 50 cycles. With its recyclability, stability, and enhanced electrochemical characteristics, the NPC@ACF electrode has been proved to be an excellent electrode for CDI applications.
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MICROCHEMICAL JOURNAL
·
2023
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IF 4.8
Shichao Ma,Xichen Yuan,Xu Yin,Yang Yang,Li Ren
Glucose redox is the indispensable method for biological energy supply, and its concentration in the organism is one of the most vital determinants of its health status. Nevertheless, nearly 10,000 organic substances that coexist with glucose in the blood hinder the glucose detection. As a result, developing a detection method that can feature high sensitivity and selectivity is extremely indispensable. In this work, a silver nanowire aerogel (AgNW-gel) was prepared for non-enzymatic glucose detection. The unique porous structure of aerogel and the high electrical conductivity of silver guarantee rapid electron transport and transfer. Furthermore, the presence of massive mesopores in AgNW-gel imparts high specific surface area which provides a large number of active sites. Compared to enzymatic glucose methods, the AgNW-gel, which is a non-enzymatic assay, has a lower environmental dependence. With the help of these characteristics, the glucose non-enzymatic sensor exhibits a high sensitivity of 1940 μA·mM −1 · cm −2 , a wide linear range from 1.0 to 3.5 mM, and a detection limit of 0.8 mM· cm 2 . In addition, the largest interference signal was only 4.4% of the glucose signal in the interference test for the five common interferents in blood.
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ACS Sensors
·
2023
·
IF 8.9
Shixian Liu,Yuting Hou,Zirui Li,Chenyu Yang,Guozhen Liu
A fully integrated device for salivary detection with a sample-in-answer-out fashion is critical for noninvasive point-of-care testing (POCT), especially for the screening of contagious disease infection. Microfluidic paper-based analytical devices (μPADs) have demonstrated their huge potential in POCT due to their low cost and easy adaptation with other components. This study developed a generic POCT platform by integrating a centrifugal microfluidic disc with μPADs to realize sample-to-answer salivary diagnostics. Specifically, a custom centrifugal microfluidic disc integrated with μPADs is fabricated, which demonstrated a high efficiency in saliva treatment. To demonstrate the capability of the integrated device for salivary analysis, the SARS-CoV-2 Nucleocapsid (N) protein, a reliable biomarker for SARS-CoV-2 acute infection, is used as the model analyte. By the chemical treatment of the μPAD surface, and by optimizing the protein immobilization conditions, the on-disc μPADs were able to detect the SARS-CoV-2 N protein down to 10 pg mL–1 with a dynamic range of 10–1000 pg mL–1 and an assay time of 8 min. The integrated device was successfully used for the quantification of the N protein of pseudovirus in saliva with high specificity and demonstrated a comparable performance to the commercial paper lateral flow assay test strips.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2023
·
IF 6
Ziyue Tang,Yingquan Chen,Juping Liu,Wei Cheng,Xianhua Wang,Qiang Hu,Yang Yang,Haiping Yang,Hanping Chen
There is significant effect on thermal behaviors pyrolytic characteristics of the interactions between microalgal components. In order to understand the reaction process, interaction mechanism, and better utilization of microalgae, co-pyrolysis of microalgal model compounds (soybean protein (PT), sunflower oil (OL) and sucrose (SC)) was carried out with TG-FTIR and Py-GC/MS. The results showed that co-pyrolysis of PT and SC significantly changed the thermal behaviors, and accelerated decomposition at lower temperature to generate C O, CO 2 largely. And it could promote the generation of linear O-compounds (such as acetic acid), and inhibit the formation of N-heterocycles and furans. Moreover, OL co-pyrolysis with PT or SC could significantly promote the formation of long-chain acid and inhibit the generation of aliphatics. Meanwhile, co-pyrolysis of PT and OL inhibited the generation of N-heterocycles. And co-pyrolysis of SC and OL accelerated the generation of furans. Furthermore, co-pyrolysis of model compounds reduced the average activation energy of the pyrolysis process, and changed the reaction kinetic model.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Yumei Qin,Yufei Zhou,Xue Yan,Zihan Qin,Yuezhong Mao,Shiyi Tian
Sweetness is a crucial indicator for identifying sweeteners used for flavor regulation and nutritional matching of foods. This study established a new quantitative sweetness evaluation method based on a combination of transiently transfected sweet taste receptor cells (STRs) and human sensory evaluation. Here, nine different sweeteners were evaluated and 10 sensory difference intensities and their corresponding concentrations were obtained through sensory evaluation. Using the same concentration solution as in the sensory evaluation, the dosage-response curve and EC 50 of the nine sweeteners were obtained by analyzing the intracellular calcium signal fluctuation of STRs. Data analysis revealed that the calcium signal intensity and sweetness intensity under the same concentration of sweetener presented a strong linear correlation (R 2 > 0.9). Additionally, we found a favorable correlation (R 2 = 0.8746) between the relative sweetness and EC 50 . These findings indicate that the quantitative evaluation of sweetness based on STRs could be a potential alternative to human sensory evaluation.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Chunhao Cao,Wenchuan Guo
Consumption of leafy vegetables with excessive imidacloprid (IMI) can cause serious harm to the human body. To achieve rapid IMI detection, a carbon dots (CDs)-based fluorescent (FL) probe was hydrothermally prepared using O-phenylenediamine as the precursor. The morphology, particle size distribution, crystal structure, optics and chemical bond state of the as-prepared CDs were characterized. The mechanism of the CDs in detecting IMI was investigated by Fourier transform infrared spectroscopy, and the CDs’ selectivity, stability, sensitivity, and actual sample recovery were tested. The CDs showed good selectivity, stability, and anti-interference ability. Under optimum conditions, there was a strong linear relationship between the FL intensity of the CDs and the IMI concentration in the range of 0.037–0.2 mg/L. The detection limit was 0.00187 mg/kg. The CDs were successfully applied to detect IMI in lettuce, cole, spinach, and pakchoi with spiked recoveries between 81.026% and 106.803% and a relative standard deviation between 0.001 and 0.027%.
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