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Weisheng Zheng, Hailing Wang, Zhaolian Zhu, Peng Wei
Polydopamine-modified granule organo-attapulgite adsorbent (PDA-GOAT) was facilely prepared via a dip-coating approach. The samples were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. Surface area and pore size were calculated from the Brunauer-Emmett-Teller method by N2 adsorption-desorption isotherm. The adsorption behaviour of methylene blue (MB) onto PDA-GOAT was systematically investigated. The experimental data revealed that the adsorption process fitted well with the pseudo-second-order kinetics equation and the adsorption isotherm fitted better with the Langmuir model...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Yao Cen, Wen-Jing Deng, Ru-Qin Yu, Xia Chu
5'-Polynucleotide kinase (PNK) is a crucial enzyme that catalyzes the phosphorylation of nucleic acid with 5'-OH termini and this phosphorylation reaction has been involved in many important cellular activities. The evaluation of PNK activity has received an increasing attention due to the significance of PNK. Here, the polydopamine nanospheres (PDANS) could adsorb single-stranded DNA (ssDNA) through π-π stacking or hydrogen bonding between nucleobases and aromatic groups of PDANS, while the interaction between double-stranded DNA (dsDNA) with PDANS was weakened due to the changed conformation...
April 1, 2018: Talanta
Shuo Li, Qiong Wu, Pinyi Ma, Yue Zhang, Daqian Song, Xinghua Wang, Ying Sun
A novel surface plasmon resonance (SPR) biosensor based on hollow gold nanospheres (HGNPs) and an improved sandwich assay was developed to detect rabbit IgG. The electromagnetic coupling between the HGNPs and Au film, and the notable plasmonic fields spread over the inner and outer surfaces of HGNPs, led to the considerable amplification of the SPR signal. Polydopamine-Ag@Fe3O4/reduced graphene oxide (PDA-Ag@Fe3O4/rGO) was introduced to bind detection antibody (Ab2) to form the improved sandwich structure. Ag nanoparticles were excited to produce SPR and their hot electrons were doped on graphene thin films, which amplified the response of biomolecules...
April 1, 2018: Talanta
Marco d'Ischia
Melanin biopolymers are currently the focus of growing interest for a broad range of applications at the cutting edge of biomedical research and technology. This Special Issue presents a collection of papers dealing with melanin-type materials, e.g., polydopamine, for classic and innovative applications, offering a stimulating perspective of current trends in the field. Besides basic scientists, the Special Issue is directed to researchers from industries and companies that are willing to invest in melanin research for innovative and inspiring solutions...
January 12, 2018: International Journal of Molecular Sciences
Kun Chen, Rongrong Jin, Chen Luo, Guoxin Song, Yaoming Hu, Hefa Cheng
A novel adsorbent made of polydopamine-functionalized magnetic graphene and carbon nanotubes hybrid nanocomposite was synthesized and applied in the determination of 16 priority polycyclic aromatic hydrocarbons by magnetic solid phase extraction in water samples. FTIR spectroscopy, transmission electron microscopy, scanning electron microscopy, and Raman spectroscopy consistently indicate that the synthesized adsorbents are made of core-shell nanoparticles well dispersed on the surface of graphene and carbon nanotubes...
January 12, 2018: Journal of Separation Science
M Toma, S Izumi, K Tawa
A rapid and sensitive detection of a cancer marker, neuron specific enolase (NSE), is demonstrated by using a disposable silver plasmonic chip functionalized with a mussel-inspired polydopamine (PDA) coating. A plasmonic chip consisting of a diffraction grating coated with a silver thin film is used for the excitation of propagating surface plasmon resonance through a rear-side grating coupling method. Simple and quick bio-functionalization of the sensor surface is performed by PDA coating which requires 20 min for deposition, and allows direct attachment of the capture antibody without using any coupling agents...
January 12, 2018: Analyst
Jianhua Liu, Longhai Jin, Yinghui Wang, Xing Ding, Songtao Zhang, Shuyan Song, Daguang Wang, Hongjie Zhang
Design of new nanoagents that intrinsically have both diagnostic imaging and therapeutic capabilities is highly desirable for personalized medicine. In this work, a novel nanotheranostic agent is fabricated based on polydopamine (PDA)-functionalized Co-P nanocomposites (Co-P@PDA) for magnetic resonance imaging (MRI)-guided combined photothermal therapy and chemotherapy. The ultrahigh relaxivity of 224.61 mm-1 s-1 can enable Co-P@PDA to be applied as an excellent contrast agent for MRI in vitro and in vivo, providing essential and comprehensive information for tumor clinical diagnosis...
January 11, 2018: Small
Yiyan Song, Huijun Jiang, Bangbang Wang, Yan Kong, Jin Chen
To tackle severe environmental pollution, a search for materials by economical and eco-friendly preparations is demanding for public health. In this study, a novel in situ method to form silver nanoparticles under mild conditions was developed using biomimetic reducing agents of polydopamine coated on the rodlike mesoporous silica of SBA-15. The synthesized SBA-15/polydopamine (PDA)/Ag nanocomposites were characterized by a combination of physicochemical and electrochemical methods. 4-Nitrophenol (4-NP) and methylene blue (MB) were used as models for the evaluation of the prepared nanocatalysts of SBA-15/PDA/Ag in which the composite exhibited enhanced catalytic performance toward degrading 4-NP in solution and MB on the membrane, respectively...
January 5, 2018: ACS Applied Materials & Interfaces
Ngon T Tran, David P Flanagan, Joshua A Orlicki, Joseph L Lenhart, Kenneth Proctor, Daniel Brainard Knorr
Numerous studies have focused on the remarkable adhesive properties of polydopamine, which can bind to substrates with a wide range of surface energies, even under aqueous conditions. This behavior suggests that polydopamine may be an attractive option as a surface treatment in structural bonding applications, where good bond durability is required. Here, we assessed polydopamine as a surface treatment for bonding aluminum plates with an epoxy resin. A model epoxy adhesive consisting of diglycidyl ether of bisphenol A (DGEBA), and Jeffamine® D230 polyetheramine was employed and lap shear measurements (ASTM D1002 10) were made (i) under dry conditions to examine initial bond strength and (ii) after exposure to hot/wet (63 oC in water for 14 days) conditions to assess bond durability...
January 3, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Kefyalew Dagnew Addisu, Balkew Zewge Hailemeskel, Shewaye Lakew Mekuria, Abegaz Tizazu Andrgie, Yu-Chun Lin, Hsieh-Chih Tsai
Manganese-based nanomaterials are an emerging new class of magnetic resonance imaging (MRI) contrast agents (CAs) that provide impressive contrast abilities. MRI CAs that can respond to pathophysiological parameters like pH or redox potential are also highly demanded for MRI guided tumor diagnosis. Until now, synthesizing nanomaterials with good biocompatibility, physio-chemical stability, and good contrast effects remain challenging. This study investigated two new systems of calcium/manganese cations complexed with either alginate-polydopamine or alginate-dopamine nanogels (AlgPDA(Ca/Mn) NG or AlgDA (Ca/Mn) NG)...
December 26, 2017: ACS Applied Materials & Interfaces
Yuzhen Zhang, Jia-Wei Zhang, Chong-Zhi Wang, Lian-Di Zhou, Qihui Zhang, Chun-Su Yuan
In this work, a modified pretreatment method using magnetic molecularly imprinted polymers (MMIPs) was successfully applied to study the metabolites of an important botanical with ultra-performance liquid chromatography/quadrupole time-of-flight mass spectrometry (UPLC-Q-TOF-MS). The MMIPs for glucoside-specific adsorption was used to identify metabolites of Pulsatilla chinensis in rat feces. Polymers were prepared by using Fe3O4 nanoparticles as the supporting matrix, D-glucose as fragment template and dopamine as the functional monomer and cross-linker...
December 20, 2017: Journal of Agricultural and Food Chemistry
Lin Wang, Yi Yuan, Ruo-Jun Mu, Jingni Gong, Yongsheng Ni, Xin Hong, Jie Pang, Chunhua Wu
Three-dimensional nanofibers cryogels (NFCs) with both thermally-tolerant and mechanically-robust properties have potential for wide application in biomedical or food areas; however, creating such NFCs has proven to be extremely challenging. In this study, konjac glucomannan (KGM)/poly (lactic acid) (PLA)-based novel NFCs were prepared by the incorporation of the mussel-inspired protein polydopamine (PDA) via a facile and environmentally-friendly electrospinning and freeze-shaping technique. The obtained KGM/PLA/PDA (KPP) NFCs were characterized by field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and compressive and tensile test...
December 16, 2017: International Journal of Molecular Sciences
Thomas Bucher, Juliana I Clodt, Andrej Grabowski, Martin Hein, Volkan Filiz
Porous polyethersulfone membranes as used in oenology were investigated in order to evaluate temperature-dependent permeances in a temperature range from 10 to 35 °C. A temperature correction factor was determined for this type of membrane to get accurate and comparable results for further developments. Moreover, the membranes were modified with a bio-inspired polydopamine coating in order to reduce fouling. The performance of the membranes could be increased with respect to permeance and flux recovery under cross-flow conditions...
December 16, 2017: Membranes
Wenwei Zhan, Siruo Yu, Liang Gao, Feng Wang, Xue Fu, Gang Sui, Xiaoping Yang
Nowadays, physical absorption has become a feasible method offering an efficient and green route to remove organic pollutants from the industrial wastewater. Inspired by polydopamine (PDA) chemistry, one dimensional PDA functionalized multi-walled carbon nanotubes (MWCNT-PDA) were creatively introduced into graphene aerogel framework to synthesis a robust graphene/MWCNT-PDA composite aerogel (GCPCA). The whole forming process needed no additional reducing agents, significantly reducing the contamination emissions to the environment...
December 15, 2017: ACS Applied Materials & Interfaces
Youkui Zhang, Yunxiang Lin, Hongliang Jiang, Chuanqiang Wu, Hengjie Liu, Changda Wang, Shuangming Chen, Tao Duan, Li Song
Admittedly, the surface atomic structure of heterogenous catalysts toward the electrochemical oxygen reduction reaction (ORR) are accepted as the important features that can tune catalytic activity and even catalytic pathway. Herein, a surface engineering strategy to controllably synthesize a carbon-layer-wrapped cobalt-catalyst from 2D cobalt-based metal-organic frameworks is elaborately demonstrated. Combined with synchrotron radiation X-ray photoelectron spectroscopy, the soft X-ray absorption near-edge structure results confirmed that rich covalent interfacial CoNC bonds are efficiently formed between cobalt nanoparticles and wrapped carbon-layers during the polydopamine-assisted pyrolysis process...
December 14, 2017: Small
Shuwei Liu, Lu Wang, Min Lin, Dandan Wang, Ziqi Song, Shuyao Li, Rui Ge, Xue Zhang, Yi Liu, Zhimin Li, Hongchen Sun, Bai Yang, Hao Zhang
Gold nanorods (AuNRs) are potentially useful in tumor theranostics, but the poor stability, high toxicity, and rapid removal by the immune system seriously limit their theranostic applications. In our study, we demonstrate the fabrication of Cu(II)-doped polydopamine-coated AuNR (AuNR@CuPDA), which significantly improves the potentials in tumor theranostics. Besides the improvement of physiological stability and biocompatibility, the PDA shell increases the photothermal performance and prolongs the blood circulation time of AuNRs...
December 13, 2017: ACS Applied Materials & Interfaces
Li Shi, Xiaojian Li, Wenjuan Zhu, Yaoguang Wang, Bin Du, Wei Cao, Qin Wei, Xuehui Pang
Heart failure (HF) is a burgeoning public health problems trigged by heart circulation disorder. N-terminal pro-B-type natriuretic peptide (NT-proBNP) has been acknowledged as a prognostic biomarker for cardiac disease. Herein, a sandwich-type electrochemiluminescence (ECL) immunosensor was introduced for sensitive detection of NT-proBNP. Gold nanoparticles modified graphene oxide-Ru(bpy)32+/Ag2C2O4 was used as luminophore and desirable platform for immobilization of the capture antibodies. The more stable immobilization of plentiful Ru(bpy)32+ could be implemented by direct covalently-bonded chelating with Ag2C2O4...
December 11, 2017: ACS Sensors
Emilia Peltola, Sami Sainio, Katherine B Holt, Tommi Palomäki, Jari Koskinen, Tomi Laurila
A significant problem with implantable sensors is electrode fouling, which has been proposed as the main reason for biosensor failures in vivo. Electrochemical fouling is typical for dopamine (DA) as its oxidation products are very reactive and resulting polydopamine has a robust adhesion capability to virtually all types of surfaces. The degree of DA fouling of different carbon electrodes with different terminations was determined using cyclic voltammetry (CV) and scanning electrochemical microscopy (SECM) approach curves and imaging...
December 8, 2017: Analytical Chemistry
Yu Tokura, Sean Harvey, Chaojian Chen, Yuzhou Wu, David Yuen Wah Ng, Tanja Weil
A versatile, bottom-up approach allows the controlled fabrication of polydopamine (PD) nanostructures on DNA origami. PD is a biosynthetic polymer that has been investigated as an adhesive and promising surface coating material. However, the control of dopamine polymerization is challenged by the multistage-mediated reaction mechanism and diverse chemical structures in PD. DNA origami decorated with multiple horseradish peroxidase-mimicking DNAzyme motifs was used to control the shape and size of PD formation with nanometer resolution...
December 6, 2017: Angewandte Chemie
Yi Wang, Guoqing Wei, Xiaobin Zhang, Xuehui Huang, Jingya Zhao, Xing Guo, Shaobing Zhou
Mitochondrial-targeting therapy is an emerging strategy for enhanced cancer treatment. In the present study, a multistage targeting strategy using doxorubicin-loaded magnetic composite nanoparticles is developed for enhanced efficacy of photothermal and chemical therapy. The nanoparticles with a core-shell-SS-shell architecture are composed of a core of Fe3 O4 colloidal nanocrystal clusters, an inner shell of polydopamine (PDA) functionalized with triphenylphosphonium (TPP), and an outer shell of methoxy poly(ethylene glycol) linked to the PDA by disulfide bonds...
December 4, 2017: Small
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