ANALYST
·
2013
·Vol. 138
·期 9
·2592-2597
·
IF 3.969
Shao-Kai Sun,Bei-Bei Wang,Xiu-Ping Yan
Owing to the biological and clinical significance of deoxyribonuclease I (DNase I), it is highly desirable to develop near-infrared (NIR) fluorescent assays for the determination of DNase I activity. Here we report a label-free NIR fluorescent assay for selective determination of DNase I activity based on malachite green (MG)/G-quadruplexes. In the presence of Na+ or K+, single stranded DNA (ssDNA) is able to form a G-quadruplex structure, thus to increase the rigidity of MG structure and result in a remarkable NIR fluorescence. As DNase I is capable of cleaving all types of DNA indiscriminately to release nucleotide products, the G-quadruplexes are cleaved into oligonucleotides in the presence of DNase I. As a result, the rigidity of MG structure is reduced, and the NIR fluorescence of the solution decreases with increase of DNase I activity, providing a useful platform for low-cost, label-free and convenient detection of DNase I activity. Under the optimum conditions, the proposed label-free NIR fluorescent assay gave a detection limit of 1 u mL−1, and a relative standard deviation of 3.2% for eleven replicate detections of 50 u mL−1 DNase I. The proposed assay was applied to the determination of DNase I activity in spiked human urine samples with recoveries from 99.1 to 109.0%.
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CHINESE JOURNAL OF CATALYSIS
·
2019
·
IF 4.914
Zhi-Hua Zhou,Xiao Zhang,Yong-Fu Huang,Kai-Hong Chen,Liang-Nian He
Inexpensive and efficient Cu(I) catalysis is reported for the synthesis of α-hydroxy ketones from propargylic alcohols, CO 2 , and water via tandem carboxylative cyclization and nucleophilic addition reaction. Notably, hydration of propargylic alcohols can be carried out smoothly under atmospheric CO 2 pressure, generating a series of α-hydroxy ketones efficiently and selectively. This strategy shows great potential for the preparation of valuable α-hydroxy ketones by using CO 2 as a crucial cocatalyst under mild conditions.
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BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING
·
2023
·Vol. 41
·期 1
·325-337
·
IF 1.2
Li Juan,Chen Shuliang,Chen Yunlong,Hu Xianzhi,Zi Futing
The thiosulfate method is a cyanide-free hydrometallurgical method for gold extraction, but the existence of copper ion in Cu 2+ –NH 3 –S 2 O 3 2− system is not conducive to the subsequent gold(I) recovery. This paper describes a process for improving the gold(I) adsorption capacity of mercapto-functionalized silica gel (MP-SG) by using ethylenediamine (en) as an additive to mask copper(II). The effects of en/Cu 2+ molar ratio, contact time, and pH on adsorption were investigated. The results showed that the addition of en increased the adsorption capacity of MP-SG to gold by more than 70%. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) confirmed that the valence states of gold and copper on the adsorbent were both + 1, which confirmed the occurrence of competitive copper(II) adsorption. This could be inhibited by the addition of en without affecting the interfacial properties of MP-SG. UV–vis spectroscopy and the distribution of copper species revealed that addition of en changed the composition of the solution, forming a more stable Cu(en) 2 2+ complex, the fraction of Cu(en) 2 2+ increased with en content, thus reducing the competitive adsorption of Cu(II) to gold (I). The recovery rate of gold in the actual thiosulfate leaching solution was up to 92.35%, and en has almost no influence on the recycling process of the recovered leaching liquor, which proves the feasibility of this method in practical application.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Manxing Huo,Ruzhen Zhao,Xiaopeng Jin,Lijuan Liu,Ziwen Ying,Yongming Zhu,Qifeng Wei,Xiulian Ren
Solvent extraction is an effective method for addressing the difficult separation of Cr 3+ and Fe 3+ in sulfuric acid media. Bis(2-ethylhexyl)phosphate (P204) has been shown to extract Fe 3+ from systems where Cr 3+ and Fe 3+ coexist. However, the issue of co-extraction of chromium remains. Considering that 2-ethylhexyl 2-ethylhexylphosphate (P507) and P204 are the same class of extractants, this study proposes the use of P507 to separate Cr 3+ and Fe 3+ . Under optimal conditions, the primary extraction efficiency for Fe 3+ reached 99.65%, with Cr 3+ being co-extracted at only 5.93%, and Al being co-extracted by 8.66%. The co-extracted Al 3+ was removed by a three-stage cross-current scrubbing process. After three-stage counter-current stripping, selective stripping of iron was achieved, leading to the effective separation of Cr 3+ and Fe 3+ . To date, no studies have reported on the role of sulfate ions in the extraction of Fe 3+ by P507. This study for the first time, reveals a new extraction mechanism in which sulfate ions (SO 4 2− ) play a role in the formation of complexes during the extraction process. It also provides a technological foundation for the further recovery of high-purity Cr 3+ and offers valuable insights into the behavior of sulfate ions during the extraction process.
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ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Ying-Ying Zhao,Hai-Yian Sun,Chang Wei,Tian-Yu Pan,Lu Yang,Mei-Ling Feng,Xiao-Ying Huang
The highly selective capture of 137 Cs + from complex solutions is still challenging because of its high solubility, easy mobility, and the influence of interfering ions. Here, a reliable strategy is demonstrated for specific Cs + ion recognition and separation through constructing the confined space as an “ion lock” in the microporous framework. A new 3D microporous indium oxalatophosphate with the highly selective Cs + capture, namely [Me 2 NH 2 ] 1.5 [In 2 (PO 4 ) 0.5 (H 2 PO 4 )(HPO 4 ) 1.5 (C 2 O 4 )] (FJSM-NINPC) is prepared. FJSM-NINPC with excellent radiation resistance shows ultra-fast kinetics (high removal rate of 97.63% within 1 min) and high adsorption capacity of 268.12 mg g −1 for Cs + . It can highly selectively capture Cs + under excessive competitive ions and even in environmental water samples. Furthermore, the ion exchange column filled with FJSM-NINPC can quickly separate and recover Cs + from mixed Cs + and Sr 2+ solution (separation factor SF Cs/Sr = 249.17). Moreover, single crystal structure analysis combined with density functional theory calculations confirms that Cs + ions are “encapsulated” in channels of FJSM-NINPC by the suitable spatial confinement and with strong Cs···O interactions. This work not only provides an unprecedented microporous metal oxalatophosphate with high Cs + selectivity but clearly reveals the Cs + capture mechanism and structure-function relationship of microporous materials for radionuclides remediation.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Mingxian Duan,Yeshuang Wang,Huiling Fan,Zhelin Su,Chao Yang,Jiawei Kou,Ju Shangguan
Thiophene (C 4 H 4 S) removal from coke oven gas is critical to its subsequent high valuable utilization but remains a challenge. MOF-199 was considered as a promising candidate for C 4 H 4 S adsorption removal owing to its nature of enriched opened Cu sites. However, the presence of mixed valence of Cu(II) and Cu(I) in MOF-199 makes it puzzling to their respective contribution to the removal of C 4 H 4 S. Herein, a series of MOF-199 with different Cu(I) contents were synthesized using different methods, including hydrothermal, solution diffusion, and ultrasonic, and their C 4 H 4 S adsorption performance were investigated. The respective contributions of Cu(II) and Cu(I) to the C 4 H 4 S removal was systematically discussed. The collected results indicated that although the samples prepared with different methods present a remarkable difference in textural characters, the latter was found to have a negligible influence on the C 4 H 4 S removal owing to MOF-199(H) affording an inferior surface area and pore volumes but performing the best C 4 H 4 S removal capacity of 53.7 mg S/g. The co-adsorption results of CH 3 SCH 3 and C 4 H 4 S indicated that the excellent performance of MOF-199(H) mainly attributed to the presence of Cu(I), which provides active sites for C 4 H 4 S adsorption through π complex coordination. Cu(II) species was also found to the C 4 H 4 S adsorption via soft-acid-base coordinated interaction, but its contribution is 8.3 mg S/g, only accounting for 15.5 %. Additionally, the adsorption of C 4 H 4 S on MOF-199(H) was found to follow the intra-particle diffusion model and the Langmuir models. Moreover, MOF-199(H) also exhibited an excellent regeneration performance due to the weak interaction between C 4 H 4 S and their opened Cu sites, the C 4 H 4 S adsorption capacity still reaches 50.6 mg S/g after three regeneration cycles, about 94 % of its initial value. The results collected in this study will provide new insights for the manipulation of performance of C 4 H 4 S adsorption on the MOF-199.
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Comparative Immunology Reports
·
2025
·
IF 0
Dandan Feng,Zhu Zhu,Shangpeng Wang,Yangcan Gao,Yingwen Li,Yuying Sun,Jiquan Zhang
Antimicrobial peptides (AMPs) are crucial immune effectors in the defense against pathogens. Crustins, small molecule antimicrobial peptides found in crustaceans, exhibit antimicrobial and antiviral properties, microbial binding ability, biofilm growth inhibition, and protease inhibition. In this study, we identify and characterize a crustin (named NdCrus1) from Neocaridina denticulata sinensis . The NdCrus1 was expressed in all tested tissues, with the highest expression in the stomach. NdCrus1 shares a high identity with type I crustins and contains a whey acidic protein (WAP) domain, featuring eight cysteine residues that form the conserved ‘‘four-disulfide core’’ structure. Recombinant NdCrus1 (rNdCrus1) did not significantly inhibit Bacillus subtilis and Vibrio parahaemolyticus but possessed an inhibitory effect on proteases under a wide range of temperature conditions. In addition, in vitro binding assays and molecular docking results indicated that NdCrus1 had a strong binding capacity with chitin. These results provide new insights into crustins in the life activities of N. denticulata sinensis and provide references for studying antibacterial activity characteristics and mechanisms in other crustaceans.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Bangfeng Fu,Ruilei Yang,Liang Zhang,Weijie Gong,Ximei Han,Bingzhi Li,Qianjin Liu,Jianlong Wang
With the escalating focus on sustainable food packaging, the concurrent demands for outstanding mechanical robustness and effective photodynamic antibacterial activity in materials designed for fruit preservation have yet to be adequately fulfilled. This study first engineered an innovative food packaging nanocomposite (CPBI) through strategic integration of BiOBr/I heterojunction within a polyvinyl alcohol/carboxymethyl cellulose (PVA/CMC) matrix, integrating photodynamic antibacterial functionality and ultra-high mechanical strength for perishable fruit preservation. The incorporation of BiOBr/I into the natural-polymer network achieved remarkable pathogen inactivation efficiencies of 97.4 % against Staphylococcus aureus and 93.8 % against Escherichia coli O157:H7 via ROS-mediated membrane peroxidation. Simultaneously, the CPBI film displayed superior mechanical properties (tensile strength: 240.1 MPa, fracture strain: 260 %). In practical storage, this film successfully extended the shelf life of cherry tomatoes to 20 days, demonstrating its highly effective fruit preservation capability. This strategy advances the evolution of intelligent packaging solutions, simultaneously addressing the tripartite challenges of material sustainability, postharvest preservation, and foodborne pathogen mitigation.
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PubMed
高影响因子
PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY
·
2019
·
IF 2.87
Benshui Shu,Jingjing Zhang,Zhiyan Jiang,Gaofeng Cui,Sethuraman Veeran,Guohua Zhong
Harmine , a useful botanical compound, has demonstrated insecticidal activity against some pests. However, harmine's mechanism of action has not been thoroughly elucidated to date. To preliminarily explore harmine's insecticidal mechanisms, the cytotoxicity of harmine against Spodoptera frugiperda Sf9 cells was comprehensively investigated. Our results indicated that harmine induced apoptosis in Sf9 cells, as evidenced by cellular and nuclear morphological changes, DNA laddering and increases in caspase-3-like activities. In addition, activation of the mitochondrial apoptotic pathway by harmine was confirmed by the generation of ROS, opening of mitochondrial permeability transition pores (MPTPs), increase in cytosolic Ca 2+ , changes in mRNA expression levels of genes involved in the mitochondrial apoptotic pathway and increase and release of Cytochrome c. Furthermore, lysosomal membrane permeabilization, release of cathepsin L from the lysosome into the cytosol and cleavage of caspase-3 were also triggered, which indicated that lysosomes were involved in this physiological process . Moreover, the effect of harmine on DNA topoisomerase I activity was investigated by in vivo and molecular docking experiments. These data not only verified that harmine induced apoptosis via comprehensive activation of the mitochondrial and lysosomal pathways and inhibition of DNA topoisomerase I activity in Sf9 cells but also revealed a mechanism of harmine insecticidal functions for pest control.
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PubMed
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ANALYST
·
2016
·Vol. 141
·期 5
·1830-1836
·
IF 4.033
Xiuzhong Wang,Shanshan Dong,Ting Hou,Lei Liu,Xiaojuan Liu,Feng Li
A novel enzyme inhibition-based homogeneous electrochemical biosensing strategy was designed for an organophosphorus pesticide assay based on exploiting the resistance of a mercury ion-mediated helper probe (HP) toward nuclease-catalyzed digestion and the remarkable diffusivity difference between HPs and the mononucleotides toward a negatively charged indium tin oxide (ITO) electrode. In particular, the mercury ion-mediated T–Hg2+–T base pairs facilitate the HP labeled with methylene blue (MB) to fold into a hairpin structure, preventing its digestion by exonuclease I, and thus resulting in a low electrochemical response because of the large electrostatic repulsion between the negatively charged ITO electrode and the HPs. The competitive binding by a thiol group (–SH), produced in the hydrolysis reaction of acetylthiocholine (ACh) chloride with acetylcholinesterase (AChE), removes mercury ions from the base pairs, causing a nuclease-catalyzed digestion, and the subsequent electrochemical response increase due to the weak electrostatic repulsion between the product-mononucleotides and the ITO electrode. Mercury ion-mediated HPs were first designed for pesticide detection and diazinon was chosen as the model target. Under the optimal experimental conditions, the approach exhibited high sensitivity for diazinon detection with a detection limit of 0.25 μg L−1. The satisfactory results in the determination of diazinon in real samples demonstrate that the method possesses great potential for detecting organophosphorus pesticides. This new approach is expected to promote the exploitation of mercury-mediated base pair-based homogenous electrochemical biosensors in biochemical studies and in the food safety field.
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PubMed
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Polymer Chemistry
·
2025
·
IF 3.9
Chaoyue Shan,Haohao Zhang,Yan Gao,Hui Wang,Li Han,Yuanyuan Du,Wen He,Mingyuan Pang,Xing Gao,Yen Leng Pak
Reversible addition–fragmentation chain transfer (RAFT) polymerization enables precise regulation of polymer chain growth and active center distribution. This study adopted a two-step approach with RAFT polymerization followed by quaternization to synthesize antibacterial materials, specifically tunable porous polymers PCaPE(Br) and PCaPE(I). The work focused on the structure–activity relationship between RAFT-derived block structures and the antibacterial properties of these materials. RAFT-mediated polymerization precisely controlled the block copolymer precursor PE-PDE, which is PEMA-b-P(DMAEA-co-EGDMA), and this control facilitated the subsequent formation of ordered porous structures. When the molar ratio of poly(ethyl methacrylate) (PEMA) to ethylene glycol dimethacrylate (EGDMA) was set to 1 : 6, the final quaternized products PCaPE2(Br) and PCaPE2(I) exhibited porous and fluffy microstructures. These microstructures were characterized by large specific surface area and high porosity. This structure, combined with uniformly distributed quaternary ammonium salt groups from the quaternization of N,N-dimethylaminoethyl acrylate (DMAEA) tertiary amine groups, enhanced the contact between antibacterial active sites and bacteria as well as antibacterial efficacy. PCaPE(Br) and PCaPE(I) showed excellent broad-spectrum antibacterial activity against E. coli and S. aureus. They also maintained good reusability with over 95% activity retention after five cycles. Such advantages support their prospects in biomedicine, agricultural antibacterials and wastewater treatment.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 36
·2307
·
IF 2.8
Zhang Huayushuo,Ma Qian,Gao Pan,Li Bolong,Yang Xiaoxia,Li Chao,Song Mingming,Hou Zhiwei,Jiang Xiaomei
X-ray detection has extensive applications in medical imaging, scientific research, and security inspection. Despite the superior radiation detection properties of lead-based perovskites, including high carrier mobility and superior attenuation efficiency, their toxicity and instability arising from ion migration hinders further development. To address these challenges, a series of halogen-tuned lead-free 3-methylpiperidine bismuth halides, (C 6 H 14 N) 3 Bi 2 I 9 , (C 6 H 14 N) 2 BiBr 5 and (C 6 H 14 N) 2 BiCl 5 (C 6 H 14 N = 3-methylpiperidine) single crystals were grown and systematically characterized. 3-methylpiperidine was selected for its steric effect stabilizing the lattice, and the synergistic tuning through halogen variation enabled a structural transition along with modulation of their properties. Notably, the lateral-structured (C 6 H 14 N) 3 Bi 2 I 9 single-crystal X-ray detector exhibits a sensitivity of 388.05 μC Gy −1 cm −2 , a low detection limit of 71.05 nGy s −1 , and a small dark current drift of 2.16 × 10 –8 nA cm −1 s −1 V −1 . Importantly, this material retains its original morphology after 8 months of storage in ambient conditions. Furthermore, flexible X-ray devices fabricated via spin-coating (C 6 H 14 N) 3 Bi 2 I 9 exhibited a favorable X-ray response with a sensitivity of 121.48 μC Gy −1 cm −2 , as well as excellent mechanical stability. This work reveals that halogen tuning effectively optimizes the structure and performance of Bi-based perovskites, providing valuable insights for advancing them in X-ray detection applications.
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