PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY
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2017
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IF 2.59
Yunhe Zhao,Shuangyu Xu,Hongbao Lu,Daxia Zhang,Feng Liu,Jin Lin,Chenggang Zhou,Wei Mu
Bursaphelenchus xylophilus causes pine wilt disease (PWD), which severely damages pine species. The plant volatile trans ‑2-hexenal has strong activity against nematodes, although the precise mechanism of this inhibitory action remains unclear. In this paper, the fumigant effects of the LC 10 and LC 30 of trans ‑2-hexenal on B. xylophilus were demonstrated. The trans ‑2-hexenal treatments significantly inhibited the dispersal ability of nematodes. The results also indicated that trans ‑2-hexenal affects the metabolism of nutrients and the activity of digestive enzymes . Among detoxifying enzymes , after treatment with trans ‑2-hexenal, glutathione S-transferase activity increased significantly and general esterase activity decreased significantly. Based on these results, trans ‑2-hexenal disturbs the normal physiological and biochemical activities of this nematode. These results provide valuable insight into the nematicidal mechanisms of trans ‑2-hexenal.
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TALANTA
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2016
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IF 4.035
Li-Shun Zhang,Qing-Li Zhao,Xin-Xin Li,Xi-Xi Li,Yan-Ping Huang,Zhao-Sheng Liu
A hybrid monolith incorporated with mesoporous molecular sieve MCM-41 of uniform pore structure and high surface area was prepared with binary green porogens in the first time. With a mixture of room temperature ionic liquids and deep eutectic solvents as porogens, MCM-41 was modified with 3-(trimethoxysilyl) propyl methacrylate (γ-MPS) and the resulting MCM-41-MPS was incorporated into poly (BMA-co-EDMA) monoliths covalently. Because of good dispersibility of MCM-41-MPS in the green solvent-based polymerization system, high permeability and homogeneity for the resultant hybrid monolithic columns was achieved. The MCM-41-MPS grafted monolith was characterized by scanning electron microscopy, energy dispersive spectrometer area scanning, transmission electron microscopy, FT-IR spectra and nitrogen adsorption tests. Chromatographic performance of MCM-41-MPS grafted monolith was characterized by separating small molecules in capillary electrochromatography , including phenol series, naphthyl substitutes, aniline series and alkyl benzenes. The maximum column efficiency of MCM-41-MPS grafted monolith reached 209,000 plates/m, which was twice higher than the corresponding MCM-41-MPS free monolith. Moreover, successful separation of non-steroidal anti-inflammatory drugs and polycyclic aromatic hydrocarbons demonstrated the capacity in broad-spectrum application of the MCM-41-MPS incorporated monolith. The results indicated that green synthesis using room temperature ionic liquid and deep eutectic solvents is an effective method to prepare molecular sieve-incorporated monolithic column.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2012
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IF 2.237
Wenhua Wang,Yucui Hou,Weize Wu,Muge Niu,Weina Liu
The oxidation of coal to produce high-valued benzene polycarboxylic acids (BPCAs), which are obtained currently from diminishing petroleum reserves, is a promising industrial process of the future. Up to now, the yield distribution of BPCAs has not been studied in detail and the mechanism of coal oxidation to BPCAs remains unclear. In this study, Huolinhe lignite was oxidized in a batch reactor by alkali-oxygen oxidation. All 12 kinds of BPCAs obtained were quantified by a new established method. Effects of alkali/coal mass ratio, reaction temperature, initial oxygen pressure, and reaction time on the yield distribution of BPCAs were studied for the first time. The results indicate that BPCAs with four or five carboxyls are the predominant products, and BPCAs with one or two carboxyls are formed in a relatively short time; moreover, the formation of BPCAs with more carboxyls is relatively more sensitive to the salting out effect. CP/MAS 13C NMR spectra and oxidation of model compounds show that phenolic, ether-substituted aromatic, ether, and aldehyde groups are easily converted and that water-soluble acids (WSA) are formed rapidly and largely due to the breakage of these bonds. The step from WSA to BPCAs is relatively slow mainly due to the inertia of the aromatic clusters with attached carboxyls or carboxylate. On the whole, the BPCAs are derived from aromatic clusters through the oxidation of condensed benzene rings, bridges, or peripheral groups that are attached to the aromatic clusters. Possible mother units for BPCAs in the lignite are suggested based on the generally agreed lignite structure.
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CHEMICAL ENGINEERING JOURNAL
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2015
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IF 4.321
Jun Wang,Baoliang Chen
The adsorption and coadsorption of naphthalene, 1-naphthol and Cd 2+ onto graphene oxide (GO), chemically reduced graphene (CRG) and annealing reduced graphene (ARG) were compared to determine the unique adsorption properties of graphene nanosheets. The adsorption capability of organic pollutants followed the order CRG > ARG > GO, and all three adsorbents showed stronger adsorption to 1-naphthol than to naphthalene. In addition to a π–π interaction, the strong adsorption of 1-naphthol onto graphene nanosheets was mainly attributed to the n –π electron-donor–acceptor (EDA) interactions between the –OH groups of 1-naphthol and the electron-depleted sites on graphene nanosheets. The adsorption of 1-naphthol on reduced graphene materials increased with increasing pH and reached a maximum around its pKa, supporting the n –π EDA interaction mechanism. GO with more functional groups on the nanosheets over CRG and ARG exhibited a strong affinity with Cd 2+ . The adsorption of Cd 2+ onto GO and CRG facilitated the coadsorption of naphthalene and 1-naphthol via surface-bridging mechanisms, such as cation–π interactions. Notably, though ARG showed no significant Cd 2+ adsorption, the suppressed coadsorption of naphthalene onto ARG may be attributed to the sieving effect by hydrated Cd 2+ binding to the micropore edges on ARG.
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ANALYTICAL CHEMISTRY
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2014
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IF 5.825
Jun-Hui Zhang,Sheng-Ming Xie,Mei Zhang,Min Zi,Pin-Gang He,Li-Ming Yuan
Chiral nematic mesoporous silica (CNMS) has attracted widespread attention due to some unique features, such as its nematic structure, chirality, large pore size, high temperature resistance, low cost, and ease of preparation. We first reported the use of CNMS as a stationary phase for capillary gas chromatography (GC). The CNMS-coated capillary column not only gives good selectivity for the separation of linear alkanes, aromatic hydrocarbons, polycyclic aromatic hydrocarbons (PAHs), and isomers but also offers excellent enantioselectivity for chiral compounds. Compared with enantioseparations on commercial β-DEX 120 and Chirasil-l-Val columns, a CNMS-coated capillary column offers excellent enantioselectivity, chiral recognition complementarity, and the separation of analytes within short elution times. It can also be potentially applied in high-temperature GC at more than 350 °C. This work indicates that CNMS could soon become very attractive for separations.
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STARCH-STARKE
·
2017
·
IF 1.837
Tao Feng,Hui Wang,Ke Wang,Yi Liu,Zhiwei Rong,Ran Ye,Haining Zhuang,Zhimin Xu,Min Sun
Flavor microencapsulation has been widely used in foods, medicines, cosmetics, and other fields. The use of amylose-based complexes is receiving increasing attention because they are biodegradable, non-toxic, and biocompatible, and these complexes provide a new way to develop and impart flavors. In this study, with the aim of investigating the properties of amylose–flavor complexes, linear aliphatic alcohols (C 6 –C 9 ) and the aromatic alcohol naphthol were used to prepare inclusion complexes by the sealed heating method in yields ranging from 45 to 50%. In addition, scanning electron microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA) were utilized to investigate the structural characteristics of these inclusion complexes, and it was found that the amylose-n-heptanol inclusion complex was most stable. Furthermore, nuclear magnetic resonance (NMR) spectroscopy revealed that V-type crystals existed in the amylose–flavor complexes. Moreover, TGA showed that all amylose–flavor inclusion complexes have excellent thermal stability. The encapsulation efficiency of the complexes increased with decreasing chain length, but the encapsulation efficiency of the complexes with the aromatic alcohol naphthol was lower than that of the complexes with some linear alcohols. This indicated that the stereoscopic confirmation of α-naphthol may influence the complexes being formed.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Ran Zhang,Yijiao Wang,Xinyu Gao,Donghong Duan,Junwen Wang,Shibin Liu
The theoretical potential of the urea oxidation reaction (UOR) is a mere 0.37 V(vs.RHE), significantly lower than the 1.23 V (vs. RHE) of the oxygen evolution reaction (OER). Thus, substituting the OER with the UOR can effectively reduce the voltage required for electrolysis. Transition metal phosphates (TM-Pi), with their unique physical properties, can partly replace precious metal catalysts and hold great application potential. However, further modification is necessary to enhance their catalytic activity and stability. Therefore, this study prepared a coral-like cluster Co/Zn-Pi@NF (Pi represents phosphate) catalyst, which was grown in situ on nickel foam (NF) using the constant current electrodeposition method. The catalyst exhibited superior catalytic performance in 1 M KOH, with the required overpotentials for the hydrogen evolution reaction (HER) and OER reaching 10 mA·cm −2 being 36.6 mV and 343.4 mV, respectively. In 1 M KOH containing 0.5 M urea, the urea oxidation potential was only 1.4 V, which remained stable for 60 hours. The Co/Zn-Pi@NF nanoparticles were used as the anode and cathode for water-urea electrolysis, and the electrolysis voltage was 1.43 V at a current density of 10 mA·cm −2 , which was 290 mV lower than that of electrolyzed water. This study demonstrates that zinc-cobalt bimetallic phosphate can be used as a dual-function electrocatalyst for hydrogen evolution and urea oxidation.
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FUEL
·
2024
·
IF 6.7
Weijie Zhang,Lufang Fan,Kai Wei,Changchang Ma,Sheng Feng
This work provided innovative apertures with great exploratory value for engineering oxygen defects and designing S-scheme photocatalysts for efficient photocatalytic hydrogen production. In this study, the S-scheme heterostructure CdLa 2 S 4 /MoO 3-x (CLSMO) was synthesized by electrostatic self-assembly to solve the problem of electron hole recombination in hydrogen evolution half-reaction. The results showed that the hydrogen precipitation rate of the optimized CLSMO was 41.41 mmol g -1 h −1 , which was 12.70 times higher than that of monomeric CLS. The presence of oxygen vacancies (Ovs) increased the range of light absorption and reduces the surface dynamic barrier. More importantly, the experimental results and density functional theory (DFT) calculations showed that CdLa 2 S 4 and MoO 3-x strictly followed the S-scheme charge transfer path, accumulating photogenerated electrons in the CLS conduction band, and achieving efficient photocatalytic hydrogen evolution. This study provided a new idea to solve the problem of photocatalyst activity using OVs and S-scheme heterojunctions.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 8
·1-12
·
IF 5.3
Ruan Ya,Li Qiulan,Yang Dezhi,Yang Yaling
Copper selenide nanoparticles (CuSeNP) were synthesized using histidine, ethylenediamine, and sodium selenate as precursors by one-step microwave digestion methods. The as-prepared CuSeNPs exhibit excellent catechol oxidase mimic enzyme and catalase (CAT)-like activities. Dopamine (DA) can be oxidized to aminochrome with H 2 O 2 by CuSeNPs, and the intermediate product aminochrome can further react with α -naphthol to yield a highly fluorescent derivative. It was confirmed that Cr(III) could adsorb on the surface of CuSeNPs and inhibit the production of semiquinone radicals in the reaction system, and the catalytic activity of CuSeNPs was inhibited. The detection mechanisms, kinetics, and catalytic properties of CuSeNPs were systematically investigated. As a result, a novel fluorescence method for the assay of Cr(III) was established. The feasibility of CuSeNP nanozyme in detecting speciation Cr(III) in food samples was explored with satisfactory results. It showed the obvious potential for developing effective and dependable fluorescent detection method for protecting food safety. Graphical Abstract
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MOLECULES
·
2024
·Vol. 29
·期 1
·263
·
IF 4.2
Shuji Liu,Yue Zhang,Yihui Chen,Yongchang Su,Bei Chen,Yin Wang,Min Xu,Kun Qiao,Shuigen Li,Zhiyu Liu
Protamine is a cationic peptide derived from fish sperm and has several important functional properties: antibacterial properties, acting as a carrier for injectable insulin and as a heparin antagonist, combatting fatigue, etc. Thus, it has been widely used in medicinal applications and food products. CulturedTakifugu flavidusis a type of pufferfish with a delicious taste that is popular in China, and its production is increasing significantly. Therefore, protamine was extracted via acid extraction from the sperm ofTakifugu flavidusand further isolated and purified via sephadex gel chromatography, ion exchange chromatography, and desalination chromatography. Furthermore, the physicochemical properties of protamine were investigated. The results showed that the sperm of the culturedT. flaviduswere non-toxic, and the extracted and purified protamine had high contents of arginine (36.90%) and lysine (27.02%), respectively. The secondary structure of protamine was mainly β-folded and irregularly curled. Additionally, protamine exhibited high thermal stability with a denaturation temperature of 176 °C. This study would provide a theoretical basis for the structural analysis, bioactivity, and resource development of pufferfish protamine and help to promote the development of the pufferfish industry.
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ADVANCED FUNCTIONAL MATERIALS
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2024
·
IF 18.5
Ming-Yuan Yang,Meng-Meng Han,Ling Tang,Yu-Yang Bi,Xue-Na Li,Jee-Heon Jeong,Yi Wang,Hu-Lin Jiang
Idiopathic pulmonary fibrosis (IPF) is an age-related pulmonary interstitial disease with unclear etiology that poses a serious threat to human health. IPF interventions in clinical settings mainly involve oral medications, such as nintedanib (NIN), which exhibit limited accumulation in the lungs and neglect the epithelial micro-environment. Inhalation is an efficient route for the treatment of pulmonary diseases. However, the mucus barrier in the trachea and the extracellular matrix (ECM) barrier in the interstitium are the two main obstacles to inhaled therapeutic agent delivery. Therefore, in this study, dual barrier-penetrating inhaled liposomes (AN-TR) are constructed utilizing tris-(2-carboxyethyl)-phosphine (TCEP) and l -arginine to penetrate the mucus and ECM barriers, respectively. This approach facilitates the thorough and uniform distribution of NIN and navitoclax (ABT-263) across all five lung lobes. Furthermore, ABT-263 can remove the senescent epithelial cells in the trachea and alveoli, thereby improving the efficiency of NIN for IPF treatment. This study suggests dual barrier-penetrating inhaled liposomes as efficient noninvasive vehicles for first-line clinical medications to improve the efficacy of IPF treatment.
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DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 21
·9011-9020
·
IF 3.5
Zhengle Chen,Zhiqing Yang,Xinyuan Li,Longhua Li,Hua Lin
The development of efficient non-noble metal electrocatalysts for the oxygen evolution reaction (OER) under acidic conditions remains a critical challenge. Herein, we report a N-doped carbonaceous component-engineered Co3O4 (NCEC) catalyst synthesized via the sol–gel method. Dopamine hydrochloride (DA)-derived nitrogen-doped carbonaceous components were found to boost the OER performance of Co3O4. The optimized catalyst can reach an overpotential as low as 330 mV in 1 M H2SO4 at a current density of 10 mA cm−2 and maintains a good long-term stability of 60 hours. In particular, we found that the thermodynamic overpotential was inversely proportional to the content of oxidized N and pyridinic N, whereas it was directly proportional to the pyrrolic-N content. Our experiments and density functional theory (DFT) calculations confirm that the optimized catalyst exhibits enhanced charge transfer and the oxidized N species on Co3O4 is responsible for the high catalytic activity. Our study suggests that the performance of NCEC in acidic media can be further optimized by enhancing the content of oxidized N species.
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