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Colloids and Surfaces. B, Biointerfaces

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https://www.readbyqxmd.com/read/28802738/bioaccumulation-and-toxicity-of-cdse-zns-quantum-dots-in-phanerochaete-chrysosporium
#1
Liang Hu, Guangming Zeng, Guiqiu Chen, Zhenzhen Huang, Jia Wan, Anwei Chen, Zhigang Yu, Jiangli Yang, Kai He, Lei Qin
The growing potential of quantum dots (QDs) in biomedical applications has raised considerable concerns regarding their toxicological impact. Consequently, there has been a need to understand the underlying toxicity mechanism of QDs. In this work, we comprehensively investigated the bioaccumulation and toxicity of three CdSe/ZnS QDs (COOH CdSe/ZnS 525, NH2 CdSe/ZnS 525, and NH2 CdSe/ZnS 625) in Phanerochaete chrysosporium (P. chrysosporium) using confocal laser scanning microscopy, reactive oxygen species (ROS) measurements, and cell viability assays...
August 5, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28806667/hydrophobic-boron-compound-loaded-poly-l-lactide-co-glycolide-nanoparticles-for-boron-neutron-capture-therapy
#2
Issei Takeuchi, Kensuke Nomura, Kimiko Makino
Poly(DL-lactide-co-glycolide) (PLGA) has been widely used and studied because of its biocompatibility and biodegradability. Recently, the usefulness of nanoparticles using poly(L-lactide-co-glycolide) (PLLGA) having a higher glass transition temperature than PLGA was suggested. In this study, we investigated the availability of boron compound-loaded PLGA and PLLGA nanoparticles for boron neutron capture therapy (BNCT) by conducting biodistribution study using tumor-bearing mice. o-Carborane, a hydrophobic boron compound, was used as a boron carrier, and o-carborane-albumin conjugate was used as a control...
August 4, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28806664/porous-plga-microparticles-formed-by-one-step-emulsification-for-pulmonary-drug-delivery-the-surface-morphology-and-the-aerodynamic-properties
#3
Shinnosuke Nishimura, Taku Takami, Yoshihiko Murakami
In the present study, by using a newly developed one-step emulsification technique, we tried to prepare porous PLGA particles having a proper diameter and surface morphology in order to achieve both a high efficient delivery of the particles to the lungs and a phagocytosis-avoidance ability. We found that our porous particles have the very low tapped density of 0.04g/cm(3). Experimental and theoretical studies strongly suggest that the shape factor should not be determined only by the outline of the particles, although previous research assigned a value of 1 to the shape factor for particles regardless of the presence of pores and their distribution...
August 4, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28802737/multi-biofunctional-polymer-graphene-composite-for-bone-tissue-regeneration-that-elutes-copper-ions-to-impart-angiogenic-osteogenic-and-bactericidal-properties
#4
L R Jaidev, Sachin Kumar, Kaushik Chatterjee
Despite several recent advances, poor vascularization in implanted scaffolds impedes complete regeneration for clinical success of bone tissue engineering. The present study aims to develop a multi-biofunctional nanocomposite for bone tissue regeneration using copper nanoparticle decorated reduced graphene oxide (RGO_Cu) hybrid particles in polycaprolactone (PCL) matrix (PCL/RGO_Cu). X-ray photoelectron spectroscopy and X-ray diffraction confirmed the presence of copper oxides (CuO and Cu2O) on RGO. Thermogravimetric analysis showed that 11...
August 4, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28802736/synthesis-of-pegylated-polyglutamic-acid-peptide-dendrimer-and-its-application-in-dissolving-thrombus
#5
Shao-Fei Zhang, Chunmei Gao, Shaoyu Lü, Jiujun He, Mingzhu Liu, Can Wu, Yijing Liu, Xinyu Zhang, Zhen Liu
Nattokinase (NK) has been used as a new generation thrombolytic drug, due to its high safety, low cost and low side effects. However, it is sensitive to external environment and may lose the enzyme activity easily. Peptide dendrimer possesses functional groups on its surface, adjustable sizes, biodegradability, biocompatibility, and low toxicity, which could be used as ideal carrier for drug protection and delivery. Demonstrated for the first time in this paper, a PEGylated dendrimer (Gn-PEG-Gn) composed of polyglutamic acid is designed and synthesized as delivery platform of NK for thrombus treatment...
August 4, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28806665/a-sequential-delivery-system-employing-the-synergism-of-epo-and-ngf-promotes-sciatic-nerve-repair
#6
Wei Zhang, Gongshe Zhou, Yuan Gao, Yan Zhou, Jianheng Liu, Licheng Zhang, Anhua Long, Lihai Zhang, Peifu Tang
The different mechanisms of nerve growth factor (NGF) and erythropoietin (EPO) in promoting repair of peripheral nerve injuries suggest a potential therapeutic application through the synergism of the two. Yet NGF has also been reported to induce early nerve apoptosis after injury. To utilize the potential synergism of NGF and EPO while minimize the possible defect, in this study, we first confirmed the time dependency of NGF caused nerve apoptosis, and then established a sequential and sustained delivery system for NGF and EPO with poly(lactide-co-glycolide) (PLGA), which has been approved by the US FDA for human use because of its injectable, biocompatible, and biodegradable properties...
August 1, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28800466/monitoring-and-modulating-ion-traffic-in-hybrid-lipid-polymer-vesicles
#7
Walter F Paxton, Patrick T McAninch, Komandoor E Achyuthan, Sun Hae Ra Shin, Haley L Monteith
Controlling the traffic of molecules and ions across membranes is a critical feature in a number of biologically relevant processes and highly desirable for the development of technologies based on membrane materials. In this paper, ion transport behavior of hybrid lipid/polymer membranes was studied in the absence and presence of ion transfer agents. A pH-sensitive fluorophore was used to investigate ion (H(+)/OH(-)) permeability across hybrid lipid/polymer membranes as a function of the fraction of amphiphilic block copolymer...
August 1, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28800462/imaging-biodistribution-and-in-vitro-study-of-smart-99m-tc-pamam-g4-dendrimer-as-novel-nano-complex
#8
Asghar Narmani, Kamal Yavari, Javad Mohammadnejad
Overexpression of folic acid receptor in various human tumors cells makes it as good candidate for targeting delivery of chemotherapeutic and radiopharmaceutical agents. In this research, FA used for functionalization of PEG modified PAMAM G4 dendrimer as a smart delivery of 5-FU and (99m)Tc for the breast carcinoma in order to chemotherapeutic and imaging goals. One aim of this research was assess the FA-mediated cell viability assay of PEG-PAMAM G4-FA-5FU-(99m)Tc and in vitro uptake of PEG-PAMAM G4-FA-(99m)Tc as the novel nano-complex determined on C2Cl2 (normal cell) and MCF-7 (breast cancer cell) cell lines...
August 1, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28787634/twisted-nanoribbons-from-a-rgd-bearing-cholic-acid-derivative
#9
Leana Travaglini, Cesare Giordano, Andrea D'Annibale, Marta Gubitosi, Maria Chiara di Gregorio, Karin Schillén, Azzurra Stefanucci, Adriano Mollica, Nicolae Viorel Pavel, Luciano Galantini
In light of the biomedical interest for self-assembling amphiphiles bearing the tripeptide Arg-Gly-Gly (RGD), a cholic acid derivative was synthesized by introducing an aromatic moiety on the steroidal skeleton and the RGD sequence on the carboxylic function of its chain 17-24, thus forming a peptide amphiphile with the unconventional rigid amphiphilic structure of bile salts. In aqueous solution, the compound self-assembled into long twisted ribbons characterized by a very low degree of polydispersity in terms of width (≈25nm), thickness (≈4...
July 31, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28787633/stiffness-signatures-along-early-stages-of-xylella-fastidiosa-biofilm-formation
#10
Moniellen P Monteiro, João H Clerici, Prasana K Sahoo, Carlos L Cesar, Alessandra A de Souza, Mônica A Cotta
The pathogenicity of Xylella fastidiosa is associated with its systematic colonization of the plant xylem, forming bacterial biofilms. Mechanisms of bacterial transport among different xylem vessels, however, are not completely understood yet, but are strongly influenced by the presence of extracellular polymeric substances (EPS), which surrounds the assembly of cells forming the biofilm. In this work, we show quantitative measurements on the elastic properties of the system composed by EPS and bacterial cell...
July 30, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28800464/accelerated-biomineralization-of-graphene-oxide-incorporated-cellulose-acetate-nanofibrous-scaffolds-for-mesenchymal-stem-cell-osteogenesis
#11
Xiaoyun Liu, He Shen, Saijie Song, Wei Chen, Zhijun Zhang
For bone tissue engineering, it requires that the scaffolds have excellent biocompatibility, proper mechanical and osteoinductive properties. Electrospun nanofibers with extracellular matrices mimicking structure have proven to be good scaffolds for bone tissue repairing. Hybrid nanofibers in particular, endow the nanofibers with specific and multiple functionalities, and therefore have attracted increasing interests in the recent years. In this study, we fabricated graphene oxide (GO)-incorporated cellulose acetate (CA) nanofibrous scaffolds by electrospinning technique for enhancement of biomineralization and osteogenic differentiation of human mesenchymal stem cells (hMSCs)...
July 29, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28797971/modified-pamam-dendrimer-with-4-carbomethoxypyrrolidone-surface-groups-its-uptake-efflux-and-location-in-a-cell
#12
Anna Janaszewska, Maciej Studzian, Johannes F Petersen, Mario Ficker, Valentina Paolucci, Jørn B Christensen, Donald A Tomalia, Barbara Klajnert-Maculewicz
Traditional amine terminated PAMAM dendrimers may be readily surface engineered by a facile one-pot conversion with dialkyl itaconate esters into 4-carbomethoxypyrrolidone terminated PAMAM (G=0-4) dendrimers. These terminated dendrimers are uniquely characterized by exhibiting blue fluorescence emissions (λexc=370nm, λmaxem=440nm). Thanks to this property they can be directly analyzed by confocal microscopy and flow cytometry without additional fluorescence labeling, treatment of dendrimers with chemicals or adjusting pH...
July 29, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28793230/role-of-silver-doping-on-the-defects-related-photoluminescence-and-antibacterial-behaviour-of-zinc-oxide-nanoparticles
#13
Vinod Kumar, Jai Prakash, Jitendra Pal Singh, Keun Hwa Chae, C Swart, O M Ntwaeaborwa, H C Swart, Viresh Dutta
The Ag doped ZnO (ZnO:Ag) NPs with a hexagonal wurtzite structure were synthesized by a solution combustion method. X-ray absorption near edge structure (XANES) and X-ray photoelectron spectroscopy (XPS) were used to study the defects, local electronic and atomic structures before and after Ag doping. XPS and XANES studies confirmed the deficiency of concentration of defects in ZnO after Ag doping. The photoluminescence study showed the deep level emission in the orange-red region in addition to the band to band emission...
July 29, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28783506/nanoscale-silver-depositions-inhibit-microbial-colonization-and-improve-biocompatibility-of-titanium-abutments
#14
Supriya Kheur, Nimisha Singh, Dhananjay Bodas, Jean-Yves Rauch, Shantanu Jambhekar, Mohit Kheur, Jyutika Rajwade
Although titanium dental implants are biocompatible, exhibit excellent corrosion resistance and high mechanical resistance, the material fails in providing resistance to infection because it exhibits poor antimicrobial activity. To address these issues, we deposited silver onto titanium abutments (Grade 5 titanium discs) using direct current (DC) sputtering and assessed the antimicrobial activity and biocompatibility of the modified implant material. Atomic absorption spectrometry and X-ray photoelectron spectroscopy were employed to investigate the concentration and elemental composition of the deposited silver...
July 29, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28780463/arginine-leucine-based-poly-ester-urea-urethane-coating-for-mg-zn-y-nd-alloy-in-cardiovascular-stent-applications
#15
Jing Liu, Pei Wang, Chih-Chang Chu, Tingfei Xi
Selected from the family of self-designed biodegradable amino acid-based poly (ester urea urethane) (AA-PEUU) pseudo-protein biomaterials, arginine-leucine based poly (ester urea urethane)s (Arg-Leu-PEUUs) were used as protective and bio-functional coatings for bio-absorbable magnesium alloy MgZnYNd in cardiovascular stent applications. Comparing with poly (glycolide-co-lactide) (PLGA) coating, the Arg-Leu-PEUU coating had stronger bonding strength with the substrate; in vitro electrochemical and long-term immersion results verified a significantly better corrosion resistance...
July 29, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28780460/nanoscale-trifunctional-bovine-hemoglobin-for-fabricating-molecularly-imprinted-polydopamine-via-pickering-emulsions-hydrogels-polymerization
#16
Yanhua Sun, Shian Zhong
In this work, a novel strategy was developed for the selective recognition of protein based on oil-in-water Pickering emulsions-hydrogels polymerization and interfacial imprinting method. For the first time, nanoscale trifunctional bovine hemoglobin (BHb) played three roles simultaneously during the process, including emulsifier, template protein and sacrificial material for further exposing recognition sites. Prior to acting as stabilizers, bovine hemoglobin colloidal particles (BCPs) were firstly prepared by acidification and heat denaturation...
July 29, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28780459/janus-enantiomorphous-nanomaterial-assembly-on-substrate-surfaces-for-chirality-dependent-cell-adhesion
#17
N S Kehr
A janus enantiomorphous nanomaterial assembly on substrate surfaces is prepared by depositing two different enantiomorphous nanomaterials (NMs) onto two different halves of the same glass substrate. This advanced construct allows us to simultaneously study and compare how the opposite biopolymer enantiomers functionalized onto the NM surfaces affect cell adhesion under exactly the same reaction conditions and at the same time, using a single biomaterial. Cell experiments show that cell adhesion to the Janus enantiomorphous NM assembly is chirality dependent when opposite enantiomers are examined on a single biomaterial...
July 29, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28779638/synthesis-and-characterization-of-hyaluronic-acid-coated-manganese-dioxide-microparticles-that-act-as-ros-scavengers
#18
Joëlle Bizeau, Christos Tapeinos, Claudio Marella, Aitor Larrañaga, Abhay Pandit
Atherosclerosis is a chronic inflammatory disease of the arterial wall that leads to cardiovascular diseases which are the major cause of deaths worldwide. There is currently no treatment that can stop or reverse the disease. However, the use of microparticles with anti-inflammatory properties could represent a promising treatment. Herein, spherical microparticles with a core-shell structure and an average diameter of 1μm were synthesized. The microparticles were comprised of a MnCO3 and MnO2 core and a 4-arm PEG-amine cross-linked shell of hyaluronic acid...
July 29, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28779637/topical-co-delivery-of-methotrexate-and-etanercept-using-lipid-nanoparticles-a-targeted-approach-for-psoriasis-management
#19
Mara Ferreira, Luísa Barreiros, Marcela A Segundo, Tiago Torres, Manuela Selores, Sofia A Costa Lima, Salette Reis
Methotrexate is indicated in psoriasis systemic therapy and its topical administration may be an option to overcome several side effects. A targeted delivery may be achieved through etanercept. Thus, a combination targeted therapy using methotrexate and etanercept could bring new perspectives for psoriasis patients. This work intended to develop and characterize co-delivery of methotrexate and etanercept using lipid nanoparticles, mediated by a carbopol hydrogel and to evaluate their potential for delivering the drug into the skin with reduced transdermal permeation...
July 29, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28797972/recent-applications-of-plga-based-nanostructures-in-drug-delivery
#20
REVIEW
Maria Mir, Naveed Ahmed, Asim Ur Rehman
Over the years, issues associated with non-biodegradable polymers have paved the way for biodegradable polymers in the domain of pharmaceutical and biomedical sciences. Poly (lactic-co-glycolic acid) (PLGA) is considered one of the most thrivingly synthesized biodegradable polymers. To formulate polymeric nanostructures, PLGA has attained noteworthy attention due to its controllable properties, complete biodegradability and biocompatibility, well defined formulation techniques and easy processing. This review focuses on fabrication techniques of PLGA based nanostructures and their advanced biomedical applications covering drug delivery and in-vivo imaging...
July 28, 2017: Colloids and Surfaces. B, Biointerfaces
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