Scientific Reports
·
2018
·Vol. 8
·期 1
·1-10
·
IF 4.122
Jin Lin,Jiang Yu,Zhang Mengjie,Li Honglong,Xiao Linghan,Li Ming,Ao Yuhui
At present, PANI/MWNT composites have been paid more attention as promising electrode materials in supercapacitors. Yet some shortcomings still limit the widely application of PANI/MWNT electrolytes. In this work, in order to improve capacitance ability and long-term stability of electrode, a multi-amino dendrimer (PAMAM) had been covalently linked onto multi-walled carbon nanotubes (MWNT) as a bridge to facilitating covalent graft of polyaniline (PANI), affording P-MWNT/PANI electrode composites for supercapacitor. Surprisingly, ordered arrays of PANI nanowires on MWNT (setaria-like morphology) had been observed by scanning electron microscopy (SEM). Electrochemical properties of P-MWNT/PANI electrode had been characterized by cyclic voltammetry (CV) and galvanostatic charge-discharge technique. The specific capacitance and long cycle life of P-MWNT-PANI electrode material were both much higher than MWNT/PANI. These interesting results indicate that multi-amino dendrimer, PAMAM, covalently linked on MWNT provides more reaction sites for in-situ polymerization of ordered PANI, which could efficiently shorten the ion diffusion length in electrolytes and lead to making fully use of conducting materials.
研究领域:
材料科学
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电化学
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纳米技术
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2016
·
IF 0.963
Jun Wang,Huan-Yu Li,Lei Song,Wei-Guang Shi,Na Zhang,Cui-Qin Li
Two novel dendritic poly(amido-amine) (PAMAM) bridged salicylaldimine ligands were synthesized by Schiff base reaction using 1.0 generation dendritic PAMAM as bridged groups. The cobalt complex with 1,4-butanediamine as core (C1) and the cobalt complex with 1,6-hexanediamine as core (C2) based on dendritic PAMAM bridged salicylaldimine ligands were prepared by metallic coordination reaction, respectively. The structures of the ligands and the dendritic cobalt complexes were characterized by fourier transform infrared (FTIR), ultraviolet spectra (UV), hydrogen nuclear magnetic resonance (1H NMR) and electrospray ionization mass spectra (ESI-MS). The complexes C1 and C2 were evaluated as catalyst precursors for ethylene oligomerization after being activated with methylaluminoxane (MAO), diethylaluminum chloride (Et2AlCl), ethylaluminium dichloride (EtAlCl2) and ethylaluminum sesquichloride (EASC). The dendritic cobalt complexes exhibited the highest activity and selectivity for high carbon oligomers with EASC as activator. Under the conditions of 1.0 MPa, 25°C and Al/Co molar ratio 1500, the catalytic activity and selectivity for C10–C20 using C1 were 3.44×106 g·(mol Co·h)−1 and 76.53% after activation with EASC, and the catalytic activity and selectivity for C10–C20 using C2 were 3.42×106 g·(mol Co·h)−1 and 84.50%, respectively.
研究领域:
无机化学
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有机金属化学
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高分子化学
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催化化学
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材料科学
✓ 已验证
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2012
·
IF 5.602
Zhimin Luo,Lihui Yuwen,Yujie Han,Jing Tian,Xingrong Zhu,Lixing Weng,Lianhui Wang
Reduced graphene oxide/PAMAM–silver nanoparticles nanocomposite (RGO–PAMAM–Ag) was synthesized by self-assembly of carboxyl-terminated PAMAM dendrimer (PAMAM-G3.5) on graphene oxide (GO) as growing template, and in-situ reduction of both AgNO 3 and GO under microwave irradiation . The RGO–PAMAM–Ag nanocomposite was used as a novel immobilization matrix for glucose oxidase (GOD) and exhibited excellent direct electron transfer properties for GOD with the rate constant ( K s ) of 8.59 s −1 . The fabricated glucose biosensor based on GOD electrode modified with RGO–PAMAM–Ag nanocomposite displayed satisfactory analytical performance including high sensitivity (75.72 μA mM −1 cm −2 ), low detection limit (4.5 μM), an acceptable linear range from 0.032 mM to 1.89 mM, and also preventing the interference of some interfering species usually coexisting with glucose in human blood at the work potential of −0.25 V. These results indicated that RGO–PAMAM–Ag nanocomposite is a promising candidate material for high-performance glucose biosensors.
研究领域:
生物传感技术
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材料科学
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电化学
✓ 已验证
DOI
高影响因子
Chemistry-An Asian Journal
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2021
·Vol. 16
·期 22
·3658-3663
·
IF 4.568
Xueke Gao,Minjun Ma,Christian Marcus Pedersen,Rui Liu,Zhenzhou Zhang,Honghong Chang,Yan Qiao,Yingxiong Wang
Despite being used as an anti-leukemic drug, the poor solubility of 6-mercaptopurine (6-MP) limits its use in topical and parenteral applications. Dendrimers are commonly used as drug carriers to improve their solubility in aqueous solution. In this work, the interactions between 6-MP and the amine-terminated poly(amidoamine) dendrimers (PAMAM−NH 2 ) were investigated by various NMR technology. The chemical shift titrations disclosed that the 6-MP interacted with the surface of PAMAM−NH 2 mainly through electrostatics. The determination of diffusion coefficient and relaxation measurements further confirmed the presence of interactions in 6-MP/PAMAM−NH 2 complexes. In addition, the encapsulation of 6-MP within the cavity of PAMAM−NH 2 was revealed through nuclear Overhauser effect spectroscopy and Saturation Transfer Double Difference analysis. Finally, the binding strength (H-8 is 100% and H-2 is 70%) of 6-MP to PAMAM−NH 2 was quantitatively expressed using epitope maps. This study provides a systematic methodology for qualitative and quantitative studies of the interactions between dendrimers and drug molecules in general.
研究领域:
药物化学
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纳米技术
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药物递送系统
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核磁共振光谱
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2019
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IF 7.65
Yongyong Yuan,Yalin Wu,Hongyuan Wang,Yayan Tong,Xueying Sheng,Yi Sun,Xianqi Zhou,Qingxiang Zhou
In present study, a sensitive and efficient method based on magnetic PAMAM dendrimers as the sorbents for magnetic solid-phase extraction (MSPE) coupled with high performance liquid-phase chromatography and ultraviolet variable wavelength detector (HPLC-VWD) was developed for simultaneous determination of trace cadmium and mercury ions. Sodium diethyldithiocarbamate (DDTC-Na) was used as the chelating agent during the elution process. Parameters that would affect the extraction efficiency including PAMAM generation, adsorbent dosage, adsorption time, elution time and volume, pH and coexisting ions were investigated to achieve the best adsorption efficiency. Under the optimal conditions, good linear relationship was obtained in the range of 0.05−200 μg L -1 for Cd 2+ and 0.1−200 μg L -1 for Hg 2+ , and the limits of detection were 0.016 and 0.040 μg L -1 , respectively. The spiked recoveries of Cd 2+ and Hg 2+ were satisfied in the range of 91.5–105% (n = 3). The proposed method was proved to be an alternative and reliable method to determine trace Cd 2+ and Hg 2+ in water samples.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Research
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2021
·Vol. 15
·期 1
·510-518
·
IF 8.897
Wu Jia-Si,Li Jia-Xian,Shu Na,Duan Qi-Jia,Tong Qi-Song,Zhang Jing-Yang,Huang Yong-Cong,Yang Si-Yu,Zhao Zhi-Bin,Du Jin-Zhi
Tumor associated macrophages (TAMs) tend to exhibit tumor-promoting M2 phenotype and contribute to the development of immunosuppressive microenvironment of solid tumors. Reprograming TAMs from M2 into tumoricidal M1 phenotype is robust for stimulating tumor immunosuppressive microenvironment (TIME). In this study, we developed a poly(amidoamine) (PAMAM) derivative dendrimer (denoted as fourth generation- N,N -diethylaminoethyl (G4-DEEA)) for efficient loading of Toll-like receptor 7 and 8 (TLR7/8) agonist (R848) to remodel the TIME for potent cancer immunotherapy. G4-DEEA exhibited a high loading capacity of R848 up to 35.9 wt% by taking advantage of its dendritic structure. The resulting formulation (designated as G4-DEEA@R848) effectively polarized M2 macrophages into M1 phenotype in vitro , and improved the maturation and activation of antigen-presenting cells. In the 4T1 orthotopic breast cancer model, G4-DEEA@R848 showed a stronger tumor inhibitory effect than free drug. The mechanistic studies suggested that G4-DEEA@R848 could significantly stimulate the TIME by repolarizing TAMs into M1 phenotype, reducing the presence of immunosuppressive myeloid cells and increasing the infiltration of tumor cytotoxic T cells. This study provides a simple but effective dendrimer-based strategy to improve the formulation of R848 for improved cancer immunotherapy.
研究领域:
癌症免疫治疗
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药学
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免疫学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2020
·
IF 0
Shuyun Meng,Ningning Zhang,Dong Liu,Xiuli Shen,Yuye Li,Fan Jia,Yang Yang,Tianyan You
The widespread introduction of Cry1Ab protein in genetically modified crops has aroused considerable concern about the risks on the environment and food safety. Herein, we reported a plasmonic enhanced photoelectrochemical (PEC) immunosensor for the precise determination of the Cry1Ab protein. Its working principle was based on the space confinement-induced surface plasmon resonance to enhance visible-light absorption of photoactive materials. The polyamidoamine (PAMAM) dendrimers were selected as the space-confined template to synthesize gold (Au) nanoparticles, that is, PAMAM–Au, which presented smaller diameter and good dispersive stability. Meanwhile, PAMAM–Au nanocomposites can exhibit significantly enhanced surface electric field intensity according to the finite-difference time-domain analysis. Further, the efficient PEC enhancement of PAMAM–Au was then validated by the highly increased photocurrent in CdSe/PAMAM–Au nanocomposites. The as-fabricated PEC immunosensor provided a wide linear range of over 4 orders of magnitude (0.01–100 ng mL–1), with the detection limit down to 3 pg mL–1 for Cry1Ab analysis. Besides, such an immunosensor was applied to analyze Cry1Ab in corn and wheat samples, and the result was in good agreement with that by the official method, enzyme-linked immunosorbent assay. Our work provides a way to fabricate high-performance sensors for the accurate detection of Cry1Ab in the environment and food products.
研究领域:
环境科学
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食品安全
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分析化学
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纳米技术
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生物化学
✓ 已验证
产品关联
DOI
ACS Applied Materials & Interfaces
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2022
·
IF 10.383
Qing Hu,Jiayi Yao,Xiaoqin Wang,Yanfang Wang,Xiaoling Fu,Ju Ma,Han Lin,Jiaqi Xu,Longhua Shen,Xiangbin Yu
Chemoimmunotherapy can synergistically enhance the therapeutic effects and decrease the side effects by a combined method. However, the effective targeted codelivery of various chemotherapeutic agents and siRNAs remains challenging. Although nanomedicine-based chemoimmunotherapy has shown great potential in cancer treatment in recent years, further effort is needed to simplify the nanocarrier designs and maintain their effective functions. Here, we report a simple but robust multifunctional liposomal nanocarrier that contains a pH-sensitive liposome (LP) shell and a dendritic core for tumor-targeted codelivery of programmed cell death ligand 1 (PD-L1) siRNA and doxorubicin (DOX) (siPD-L1@PM/DOX/LPs). siPD-L1@PM/DOX/LPs had a suitable particle size and zeta potential, excellent stability in serum, and pH-sensitive drug release in vitro. They exhibited significant cell proliferation inhibition compared to free DOX and DOX-loaded LPs and could escape endosomes, effectively release siRNA into the cytoplasm of MCF-7 cells, and significantly reduce the PD-L1 expression on tumor cells. In vivo imaging confirmed high accumulation of siPD-L1@PM/DOX/LPs at the tumor site. More importantly, compared with siPD-L1@PM/LPs or DOX alone, siPD-L1@PM/DOX/LPs were more effective in inhibiting tumor growth and activating cytotoxic T cells in vivo. In conclusion, this nanocarrier may hold promise as a codelivery nanoplatform to improve the treatment of various solid tumors.
研究领域:
癌症研究
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药学
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纳米技术
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分子生物学
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治疗学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 20
·1707440
·
IF 13.325
Siming Yu,Guowei Li,Rui Liu,Dong Ma,Wei Xue
Nowadays, antibiotic abuse increases the emergence of multidrug-resistant bacterial strains, which is the major reason for the failure of conventional antibiotic therapies. Therefore, developing novel antibacterial materials or therapies is an urgent demand. In the present study, photothermal and NO-releasing properties are integrated into a single nanocomposite to realize more efficient bactericidal effects. To this end, polydopamine (PDA) coated iron oxide nanocomposite (Fe 3 O 4 @PDA) is used as a photoconversion agent and the core, first three generation dendritic poly(amidoamine) (PAMAM-G3) is grafted on the surface of Fe 3 O 4 @PDA, and subsequently NO is loaded with the formation of NONOate. The resultant Fe 3 O 4 @PDA@PAMAM@NONOate displays controllable NO release property under intermittent 808 nm laser irradiation and excellent bacteria-separation efficiency. Moreover, excellent synergistic photothermal and NO antibacterial effects are observed against both Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus , where bacterial viability and biofilm are significantly reduced. An antibacterial mechanism study reveals that the materials first adsorb onto the bacterial membrane, then cause damage to the membrane by the increased local temperature and the released NO under laser irradiation conditions, finally leak the intracellular components like DNA and induce bacteria death. The work provides a novel way for designing of antibacterial materials with higher efficiency.
研究领域:
材料科学
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纳米技术
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细菌学
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治疗学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Xiubin Xu,Shaoyu Lü,Chunmei Gao,Xinggang Wang,Xiao Bai,Nannan Gao,Mingzhu Liu
A facile method is described to prepare pH-sensitive and self-fluorescent drug delivery systems using mesoporous silica nanoparticles and PAMAM dendrimers, providing a general route to develop multifunctional and biocompatible platforms, which integrated increasing the number of reaction sites, retaining drug molecules, controlling drug delivery behaviour and fluorescent imaging into one carrier system, for biomedical imaging diagnosis and simultaneous therapy for lesion sites such as cancers.
研究领域:
纳米技术
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材料科学
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生物医学工程
·
药剂学
✓ 已验证
产品关联
DOI
高影响因子
Acta Biomaterialia
·
2019
·
IF 6.638
Kang Chen,Xiu Xin,Lipeng Qiu,Wenpan Li,Guannan Guan,Gang Li,Mingxi Qiao,Xiuli Zhao,Haiyang Hu,Dawei Chen
P53 inactivation is often achieved through gene mutation and the excessive activity of its major negative regulator, murine double minute 2 protein (MDM2). In the present study we utilized a PAMAM-OH derivative (PAMSPF) to co-deliver p53 plasmid and MDM2 inhibitor (RG7388) to the tumor site and evaluated the synergistic anti-tumor effect of p53 plasmid and RG7388. PAMSPF was able to condense DNA and encapsulate RG7388 to form spherical nanoparticles (PAMSPF/p53/RG) with particle sizes of around 200 nm, and remain stable in the presence of heparin and nuclease . The drug loading capacity and encapsulation efficiency of RG7388 in PAMSPF/p53/RG were 0.5% and 92.5%, respectively. The p53 expressions in MDA-MB-435, p53-wild type MCF-7 cells (MCF-7/WT) and p53-silenced MCF-7 cells (MCF-7/S) treated with PAMSPF/p53/RG were promoted significantly. As a result, PAMSPF/p53/RG was able to inhibit cell proliferation , arrest cell cycle , and induce cell apoptosis of MDA-MB-435, MCF-7/WT and MCF-7/S cells. PAMSPF/p53/RG suppressed human umbilical vascular endothelial cells (HUVECs) migration, invasion and tube formation through decreasing the VEGF expression. And the biological activities described above of PAMSPF/p53/RG were significantly higher than those of PAMSPF/53 and PAMSPF/RG, exhibiting the synergistic actions of p53 plasmid and RG7388. In addition, intravenous administration of PAMPSF/p53/RG inhibited tumor growth of MDA-MB-435 and MCF-7/WT xenograft mice models, and induced no substantial weight loss. PAMSPF/p53/RG also reduced cell proliferation, and induced cell apoptosis in vivo based on the immunohistochemistry results. Collectively, PAMSPF/p53/RG is an excellent system for gene and drug co-delivery, and the combined treatment of p53 plasmid and RG7388 possesses a synergistic antitumor activity both in vitro and in vivo . Statement of significance In the present study we utilized a PAMAM-OH derivative (PAMSPF) to co-deliver p53 plasmid and RG7388 (MDM2 inhibitor) and evaluated their synergistic anti-tumor effect. PAMSPF could condense p53 plasmid and encapsulate RG7388 to form nanoparticles (PAMSPF/p53/RG). The p53 expressions in MDA-MB-435, p53-wild type MCF-7 cells (MCF-7/WT) and p53-silenced MCF-7 cells (MCF-7/S) treated with PAMSPF/p53/RG were promoted significantly. As a result, PAMSPF/p53/RG could inhibit cell proliferation, arrest cell cycle, and induce cell apoptosis of three kinds of cells. In addition, intravenous administration of PAMPSF/p53/RG inhibited tumor growth of MDA-MB-435 and MCF-7/WT xenograft mice models. Collectively, PAMSPF/p53/RG is an excellent system for gene and drug co-delivery, and the combined treatment of p53 plasmid and RG7388 possesses a synergistic antitumor activity.
研究领域:
癌症治疗
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药学
·
纳米技术
·
分子生物学
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细胞生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Regenerative Biomaterials
·
2016
·Vol. 3
·期 5
·299-307
·
IF 0
Sun Hong-Ji,Wang Yan,Hao Tong,Wang Chang-Yong,Wang Qi-Yu,Jiang Xiao-Xia
Glutathione (GSH) depletion has been an important contributor to the dysfunction of dopamine neurons. Polyamidoamine-GSH (PAMAM-GSH) was synthesized and the delivery effect of GSH into PC12 cells was tested. MTT assessment for cytotoxicity and reactive oxygen species (ROS) as well as nitrite oxide (NO) and intracelluar superoxide dismutase (SOD) detection for antioxidative ability were performed. Furthermore, the antiapoptotic ability was analysed by assessing caspase-3, JNK1/2 and Erk1/2 expression. Our data indicated that PAMAM-GSH is an effective agent to replenish GSH into PC12 cells. PAMAM-GSH developed its antioxidative and protective ability for 1-methyl-4-phenylpyridinium (MPP)-induced PC12 cells by reducing the intracellular levels of ROS and SOD activity as well as decreasing the release of NO. Meanwhile, PAMAM-GSH could inhibit caspase-3 activation and might show its antiapoptotic ability to MPP-induced PC12 cells through JNK2/Erk1/2 pathway. In summary, these studies suggest that PAMAM-GSH conjugate has an intrinsic ability to penetrate PC12 cells and deliver GSH into these cells which may provide a new strategy for clinical applications in the treatment of Parkinson’s disease.
研究领域:
神经科学
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药理学
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细胞生物学
·
疾病模型
✓ 已验证
产品关联
DOI
PubMed
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