CHEMICAL PAPERS
·
2023
·Vol. 77
·期 8
·4201-4215
·
IF 2.2
Azizi Khereshki Nasibeh,Mohammadi Asadollah,Zavvar Mousavi Hassan,Alizadeh Nina,Evazalipour Mehdi
In this work, a colorimetric chemosensor containing thiazolidinedione as a biologically active molecule (NTCS) was successfully used for the highly selective and ultra-sensitive detection of Pb 2+ and Cu 2+ ions in different water samples as well as in a living cell both visually and optically. The characterization of the probe was confirmed by NMR, FT-IR spectroscopy, and UV–Visible absorption techniques prior to experiments. Probe NTCS exhibits an obvious color change because of a ligand to metal charge transfer (LMCT) complex that transforms it from colorless to yellow in the presence of Cu 2+ and from colorless to peach in complexation with Pb 2+ in aqueous methanol–water solutions that could make it a suitable ‘naked-eye’ indicator for Cu 2+ and Pb 2+ . Based on Job’s plot analysis, the interaction binding mode of probe NTCS with Cu 2+ (NTCS-Cu 2+ ) and Pb 2+ (NTCS-Ni 2+ ) was found to be 1:1 stoichiometry complex. The stability of probe-ligand in different pH ranges (9–11) was concerned with determination of the optimum pH for the detection of Cu 2+ , and Pb 2+ ions, which provides NTCS chemosensor suitable for quantitative analysis of the above-mentioned ions under physiological state. The results illustrated that the low detection limits (LOD) for Cu 2+ and Pb 2+ were calculated as 27.7 nM and 0.79 nM, respectively. In order to quick and convenient “naked-eye” detection of the Cu 2+ and Pb 2+ ions in pure aqueous media, low-cost NTCS-based test paper strips were successfully handed-down. MTT assay and bioimaging results indicated the probe has low toxicity, biocompatibility, and successful cellular absorption; hence, the probe can be used in Cu 2+ and Pb 2+ recognition in living cells with high selectivity and sensitivity compared to other chemosensors being researched in recent years.
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高影响因子
CELLULOSE
·
2023
·Vol. 30
·期 6
·3625-3638
·
IF 5.7
Li Jiangwei,Meng Lina,Xu Yuanyuan,Wang Yonggui,Xiao Zefang,Wang Haigang,Liang Daxin,Xie Yanjun
Quaternary ammonium compounds are active functional groups that can inhibit bacterial growth and reduce drug resistance. In this study, we prepared hybrid nanoparticles (NPs) comprising quaternary ammonium cellulose derivatives (CBHE-QA n ) and citric acid (CA). Firstly, cellulose 6-bromohexanoyl ester (CBHE) was synthesized by esterification of cellulose with 6-bromohexanoyl chloride. Then, diverse CBHE-QA n (CBHE-QA 8 , CBHE-QA 10 , CBHE-QA 12 , CBHE-QA 14, and CBHE-QA 16 ) were synthesized by the reaction of CBHE with five tertiary amine compounds, namely, N,N-dimethyloctylamine, N,N-dimethyldecylamine, N,N-dimethyldodecylamine, N,N-dimethyltetradecylamine, and N,N-dimethylhexadecylamine. The hybrid NPs were formed through electrostatic interactions between CBHE-QA n and CA and named CBHE-QA n /CA x (where x represents the mass ratio of CA). These spherical NPs with average diameters of 70–145 nm exhibited excellent antibacterial activity against gram-positive bacterium S. aureus and gram-negative bacterium E. coli . Furthermore, adding CBHE-QA 16 /CA 35 NPs to a polyvinyl alcohol (PVA) matrix via a solvent casting method significantly enhanced the antibacterial activity and improved the tensile strength. With 5 wt.% of CBHE-QA 16 /CA 35 NPs, the tensile strength of the PVA composite film increased to 53.4 MPa (47.2% higher than that of the pure PVA film). Moreover, the PVA/CBHE-QA 16 /CA 35 composite films showed excellent antibacterial efficiency.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 19
·56108-56120
·
IF 5.8
Zhou Changrui,Gao Yun,Ma Qiang,Xia Zhuqing,Zhu Mengmeng,Zhang Xinhui,An Siyu,Li Shuailin,Yu Wantai
The coexistence of antibiotics and heavy metals in soil has attracted increasing attention due to their negative effects on microorganisms. However, how antibiotics and heavy metals affect functional microorganisms related to nitrogen cycle remains unclear. The goals of this work were to explore the individual and combined effects of sulfamethazine (SMT) and cadmium (Cd), selected as target pollutants in soil, on potential nitrification rates (PNR) and ammonia oxidizers (ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB)) structure and diversity by 56-day cultivation experiment. Results showed that PNR in Cd- or SMT-treated soil decreased at the beginning of the experiment and then increased over time. PNR was significantly correlated with AOA and AOB- amoA relative abundance ( P < 0.01). SMT addition (10 and 100 mg kg −1 ) significantly improved AOA activity by 13.93% and 17.93%, respectively, and had no effect on AOB at day 1. Conversely, Cd at 10 mg kg −1 significantly inhibited AOA and AOB by 34.34% and 37.39%, respectively. Moreover, the relative abundance of AOA and AOB in combined SMT and Cd addition clearly higher relative to single Cd at 1 day. The single and combined Cd and SMT increased and reduced the community richness of AOA and AOB, respectively, but reduced the diversity of both after 56 days. Cd and SMT treatments significantly changed the relative abundance of AOA phylum levels and AOB genus levels in the soil. It was mainly manifested in reducing the relative abundance of AOA Thaumarchaeota , and increasing the relative abundance of AOB Nitrosospira. Besides, AOB Nitrosospira was more tolerant to the compound addition of both than single application. Graphical abstract
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PubMed
高影响因子
Advanced Composites and Hybrid Materials
·
2023
·Vol. 6
·期 3
·1-13
·
IF 20.1
Zheng Zhichuan,Hong Xuekun,Wu Dajun,Sun Ning,Kuang Yawei,Zhang Debao,Yao Xiaxi,Du Peng,Huang Kai,Lei Ming
In recent years, transition metal-nitrogen-carbon (M–N-C) composites are expected to be an alternative to platinum group metal (PGM) among various non-precious metal catalysts investigated. However, the major challenge comes from insufficient electrocatalytic performance and durability for oxygen reduction reaction (ORR). In addition to the selection of suitable central metal active sites, the electrocatalytic activity and stability of the M–N-C catalysts can be enhanced by adjusting the electronic structure of the catalysts. In this work, M–N-C/F composites were synthesized by loading transition metal phthalocyanine complexes onto pre-fluorinated carbon nanotubes through a simple pyrolysis method. Pyrroline-N (PN) and graphite-N (GN) formed after thermal treatment can act as electron acceptors to modulate their charge distribution on the M-N 4 sites, and the use of pre-fluorinated nanotubes also allows for a more controlled introduction of fluoride ions that are well coordinated to transition metals, both of which can modulate and modify the electronic structure of M–N-C catalysts. The obtained manganese phthalocyanine/fluorinated carbon nanotubes at 800 °C (MnPc/FCNT800) exhibit a competitive electrocatalytic ORR performance with the half-wave potential ( E 1/2 ) of 0.9 V and only 12.1% decay after 20-h long-term chronoamperometry (CA) test in 1.0 M KOH electrolyte, outperforming the commercial Pt/C. Overall, this work paves the way of the electronic structure modification and design of such M–N-C composites for sustainable energy applications. Graphical Abstract
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高影响因子
CELLULOSE
·
2023
·Vol. 30
·期 10
·6507-6521
·
IF 5.7
Fan Lingling,Zheng Wenfeng,Yang Yuan,Sun Yan,Peng Songlin,Xu Jie,Yin Guangfu
Bacterial cellulose (BC)/polypyrrole (PPy) nanofibrous composites have been extensively studied in supercapacitors owing to their large specific surface area and excellent tensile strength. However, the inferior cycling stability due to structural pulverization of PPy impedes their potential applications. Herein, nanofibrous composite membranes of MXene, PPy and oxidized BC (TOBC) were prepared for flexible supercapacitor electrodes. The C6 primary hydroxyl groups of BC nanofibers were oxidized into aldehyde or carboxyl groups. Due to the enhanced interaction of TOBC with PPy and MXene, the TOBC nanofibers were horizontally wrapped on the MXene nanosheets and PPy was homogeneously deposited on the TOBC nanofibers. The flexible solid-state supercapacitors fabricated with the MXene@TOBC@PPy (TMP) electrodes achieved an areal specific capacitance of 928.9 mF cm −2 at 0.7 mA cm −2 and a capacitance retention of 85.5% after 5000 cycles. Therefore, the TMP electrodes could be a promising electrode material for flexible supercapacitors.
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高影响因子
GLYCOCONJUGATE JOURNAL
·
2023
·Vol. 40
·期 4
·435-448
·
IF 3
Bai Ruifeng,Wang Jingyi,Brockhausen Inka,Gao Yin
The presence of N -glycolylneuraminic acid (Neu5Gc), a non-human sialic acid in cancer patients, is currently attributed to the consumption of red meat. Excess dietary red meat has been considered a risk factor causing chronic inflammation and for the development of cancers. However, it remains unknown whether Neu5Gc can be generated via a chemical reaction rather than via a metabolic pathway in the presence of high levels of reactive oxygen species (ROS) found in the inflammatory and tumor environments. In this study, the conversion of N -acetylneuraminic acid (Neu5Ac) to Neu5Gc has been assessed in vitro under conditions mimicking the hydroxyl radical-rich humoral environment found in inflammatory and cancerous tissues. As a result, Neu5Gc has been detected via liquid chromatography-multiple reaction monitoring mass spectrometry. Furthermore, this conversion has also been found to take place in serum biomatrix containing ROS and in cancer cell cultures with induced ROS production.
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高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-10
·
IF 16.6
Zhang Wenqing,Xi Dawei,Chen Yihong,Chen Aobo,Jiang Yawen,Liu Hengjie,Zhou Zeyu,Zhang Hui,Liu Zhi,Long Ran,Xiong Yujie
Oxidative carbonylation of methane is an appealing approach to the synthesis of acetic acid but is limited by the demand for additional reagents. Here, we report a direct synthesis of CH 3 COOH solely from CH 4 via photochemical conversion without additional reagents. This is made possible through the construction of the PdO/Pd–WO 3 heterointerface nanocomposite containing active sites for CH 4 activation and C–C coupling. In situ characterizations reveal that CH 4 is dissociated into methyl groups on Pd sites while oxygen from PdO is the responsible for carbonyl formation. The cascade reaction between the methyl and carbonyl groups generates an acetyl precursor which is subsequently converted to CH 3 COOH. Remarkably, a production rate of 1.5 mmol g Pd –1 h –1 and selectivity of 91.6% toward CH 3 COOH is achieved in a photochemical flow reactor. This work provides insights into intermediate control via material design, and opens an avenue to conversion of CH 4 to oxygenates.
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JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 6
·1-12
·
IF 2.8
Wang Chenlin,Zhang Zhihao,Ma Zhongying,Zhou Zhenzhu,Wang Yuhua
In present, during preparing flame retardant polyvinyl alcohol (PVA) composites, most flame retardants present inferior fire retardant efficiency and trend to decrease the mechanical performance of PVA owing to bad dispersibility. Besides, they possess possible threat to human and environmental safety. In order to solve these issues, a bio-based flame retardant (PAE) is synthesized by using phytic acid and ethylenediamine to improve PVA flame retardancy, UV shielding properties and mechanical properties. According to thermographic examination, PVA composites retained its well-performed capacity of char production and thermal stability with the addition of PAE. The limiting oxygen index grows from 18.4% of pure PVA to 29.7% of PVA/PAE-15 composite and vertical burning rating reaches UL-94 V-0. The peak heat release rate and total heat release of PVA/PAE-15 sharply decreased by 68.1% and 31.0% comparing with pristine PVA. More importantly, PVA/PAE composites have outstanding mechanical properties and UV shielding, the addition of 5 wt.% PAE increases the tensile strength from 67.6 MPa to 85.1 MPa compared with pure PVA. Therefore, the results imply that the inclusion of PAE can elevate the flame retardant capability, mechanical properties and UV shielding of PVA.
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高影响因子
JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2023
·Vol. 53
·期 12
·2443-2455
·
IF 2.9
Du Xinle,Zhang Yuhan,Liu Mengying,Tian Xinyu,Cao Zhenbo
The development of sensors for rapid nitrite detection in water is of great significance to human health and environmental protection. In this study, carboxylated cellulose nanocrystals were prepared by oxidizing microcrystalline cellulose with ammonium persulfate. Subsequently, a composite film was successfully prepared by depositing carboxylated nanocrystalline cellulose and poly(diallyldimethyl ammonium chloride) onto a glass carbon electrode using the layer-by-layer assembly method. After electrodepositing poly(3,4-ethylenedioxythiophene), the resulting electrode was utilized as an electrochemical sensor for nitrite detection. The effect of the number of layers of the composite film on electrocatalytic performance towards nitrite was investigated. Under optimal conditions, the sensor exhibited an ultrafast response to nitrite within 0.5 s, which was better than that of most similar sensors reported. Additionally, it had a wide linear range of 0.5–3000 µM and a low detection limit of 0.26 µM. Furthermore, this sensor showed satisfactory recovery between 98.78 and 103.29% for nitrite in real water samples. Our study presents a significant approach towards the development of an environmentally friendly nitrite sensor with an ultrafast response. Graphical abstract
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CATALYSIS LETTERS
·
2023
·
IF 2.8
Shi Bingyu,Liu Man,Chen Jiangang
Derivatives of 2,4-dimethyldihydrocyclopentadiene were prepared, characterized by NMR spectroscopy, which was applied to 1-decene oligomerization. A two-step activation method in which both triisobutylaluminium (TIBA) and methyl aluminoxane (MAO) were co-used in sequence particularly been developed for N-doped ligand catalyst. N-doped catalyst had a very high polymerization conversion at 60–110 °C by varying the reaction temperature at 20 eq. of TIBA and 100 eq. of MAO, reaching 89.95% at 80 °C. In addition, oligomers with different viscosity grades could be obtained by adjusting the temperature. At optimized reaction conditions 75 °C, 10 eq. of TIBA and 50 eq. of MAO activation, the single pass conversion of 91.33% was achieved. The obtained oligomers had a high viscosity index above 170 at KV 100 = 6. In addition, the two-step activation method was used to compare with the conventional one-step activation method on catalysts with three different ligands of zirconium chloride. A high catalytic productivity was achieved by the two-step activation process. Depending on the nature of the ligands used, β-hydride elimination, 2,1 insertion and 1,2 rearrangement were detected as main chain release mechanisms. Meanwhile, the pathways of oligomer formation were also summarized. In brief, N-doped complex is promising catalysts for the production of high quality lubricant base oils due to their high catalytic activity and high thermal stability. Graphical Abstract
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Carbon Letters
·
2023
·Vol. 33
·期 6
·1839-1846
·
IF 4.5
Han Danyang,Yu Guo,Liu An,Li Gangyong,Wang Wei,He Binhong,Hou Zhaohui,Yin Hong
As a promising anode for sodium-ion batteries (SIBs), cobalt sulfide (CoS 2 ) has attracted extensive attention due to its high theoretical capacity, easy preparation, and superior electrochemical activity. However, its intrinsic low conductivity and large volume expansion result in poor cycling ability. Herein, nitrogen-doped carbon-coated CoS 2 nanoparticles (N–C@CoS 2 ) were prepared by a C 3 N 4 soft-template-assisted method. Carbon coating improves the conductivity and prevents the aggregation of CoS 2 nanoparticles. In addition, the C 3 N 4 template provides a porous graphene-like structure as a conductive framework, affording a fast and constant transport path for electrons and void space for buffering the volume change of CoS 2 nanoparticles. Benefitting from the superiorities, the Na-storage properties of the N–C@CoS 2 electrode are remarkably boosted. The advanced anode delivers a long-term capacity of 376.27 mAh g −1 at 0.1 A g −1 after 500 cycles. This method can also apply to preparing other metal sulfide materials for SIBs and provides the relevant experimental basis for the further development of energy storage materials.
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高影响因子
JOURNAL OF NANOBIOTECHNOLOGY
·
2023
·Vol. 21
·期 1
·1-15
·
IF 10.2
Tan Xi,Wang Chenhui,Zhou Hong,Zhang Shuting,Liu Xuhan,Yang Xiangliang,Liu Wei
Typical chemo-immunotherapy against malignant carcinoma, is characterized by the combined application of chemotherapeutic agents and monoclonal antibodies for immune checkpoint blockade (ICB). Temporary ICB with antibodies would not depress tumor intrinsic PD-L1 expression and potential PD-L1 adaptive upregulation during chemotherapy, thus exerting limited immunotherapy efficacy. Herein, we developed novel polymer-lipid hybrid nanoparticles (2-BP/CPT-PLNs) for inducing PD-L1 degradation by inhibiting palmitoylation with bioactive palmitic acid analog 2-bromopalmitate (2-BP) to replace PD-L1 antibody (αPD-L1) for ICB therapy, thus achieving highly efficient antitumor immune via immunogenic cell death (ICD) induced by potentiated chemotherapy. GSH-responsive and biodegradable polymer-prodrug CPT-ss-PAEEP10 assisted as a cationic helper polymer could help to stabilize 2-BP/CPT-PLNs co-assembled with 2-BP, and facilitate the tumor site-specific delivery and intracellular release of water-insoluble camptothecin (CPT) in vivo. 2-BP/CPT-PLNs would reinforce cytotoxic CD8+ T cell-mediated antitumor immune response via promoting intratumoral lymphocytes cells infiltration and activation. 2-BP/CPT-PLNs significantly prevented melanoma progression and prolonged life survival of mice beyond the conventional combination of irinotecan hydrochloride (CPT-11) and αPD-L1. Our work first provided valuable instructions for developing bioactive lipid analogs-derived nanoparticles via lipid metabolism intervention for oncotherapy.Graphical Abstract
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高影响因子
危险品化学品经营许可证（带存储）