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Nanocapsule

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https://www.readbyqxmd.com/read/28643777/in-situ-targeted-mri-detection-of-helicobacter-pylori-with-stable-magnetic-graphitic-nanocapsules
#1
Yunjie Li, Xiaoxiao Hu, Ding Ding, Yuxiu Zou, Yiting Xu, Xuewei Wang, Yin Zhang, Long Chen, Zhuo Chen, Weihong Tan
Helicobacter pylori infection is implicated in the aetiology of many diseases. Despite numerous studies, a painless, fast and direct method for the in situ detection of H. pylori remains a challenge, mainly due to the strong acidic/enzymatic environment of the gastric mucosa. Herein, we report the use of stable magnetic graphitic nanocapsules (MGNs), for in situ targeted magnetic resonance imaging (MRI) detection of H. pylori. Several layers of graphene as the shell effectively protect the magnetic core from corrosion while retaining the superior contrast effect for MRI in the gastric environment...
June 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/28643236/multi-reservoir-phospholipid-shell-encapsulating-protamine-nanocapsules-for-co-delivery-of-letrozole-and-celecoxib-in-breast-cancer-therapy
#2
Ahmed O Elzoghby, Shaimaa K Mostafa, Maged W Helmy, Maha A ElDemellawy, Salah A Sheweita
PURPOSE: In the current work, we propose a combined delivery nanoplatform for letrozole (LTZ) and celecoxib (CXB). METHODS: Multi-reservoir nanocarriers were developed by enveloping protamine nanocapsules (PRM-NCs) within drug-phospholipid complex bilayer. RESULTS: Encapsulation of NCs within phospholipid bilayer was confirmed by both size increase from 109.7 to 179.8 nm and reduction of surface charge from +19.0 to +7.78 mV. The multi-compartmental core-shell structure enabled biphasic CXB release with initial fast release induced by complexation with phospholipid shell followed by prolonged release from oily core...
June 22, 2017: Pharmaceutical Research
https://www.readbyqxmd.com/read/28641543/zein-based-nanocarriers-as-potential-natural-alternatives-for-drug-and-gene-delivery-focus-on-cancer-therapy
#3
Ahmed Elzoghby, May Freag, Hadeer Mamdouh, Kadria Elkhodairy
Protein nanocarriers possess unique merits including minimal cytotoxicity, numerous renewable sources, and high drug-binding capability. In opposition to delivery carriers utilizing hydrophilic animal proteins, hydrophobic plant proteins (e.g, zein) have great tendency in fabricating controlled-release particulate carriers without additional chemical modification to stiffen them, which in turn evades the use of toxic chemical crosslinkers. Moreover, zein is related to a class of alcohol-soluble prolamins and generally recognized as safe (GRAS) carrier for drug delivery...
June 22, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28629093/novel-pemulen-pullulan-blended-hydrogel-containing-clotrimazole-loaded-cationic-nanocapsules-evaluation-of-mucoadhesion-and-vaginal-permeation
#4
Julia A de Lima, Thamiris C Paines, Mariana H Motta, Watussi B Weber, Sara S Dos Santos, Letícia Cruz, Cristiane de B da Silva
In this work, hydrogels containing clotrimazole-loaded nanocapsules were developed through the innovative association of two mucoadhesive polymers: Pemulen® TR1 and Pullulan. Furthermore, the hydrogels macroscopic characteristics, pH and spreadability were evaluated. The formulations showed homogeneous appearance and pH compatible with vaginal application (around 5.0). Similar spreadability profiles were found in hydrogels containing clotrimazole-loaded nanocapsules and in the free drug as well. Hydrogels were evaluated considering their mucoadhesive potential by the falling liquid film method and the permeation/penetration capacity through cow vaginal mucosa in Franz cell...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28614070/ultralight-fe-c-nanocapsules-sponge-composite-with-reversibly-tunable-microwave-absorption-performances
#5
Yixing Li, Zhe Mao, Rongge Liu, Xiaoning Zhao, Yanhui Zhang, Gaowu Qin, Xuefeng Zhang
Microwave absorbers are usually designed to solve electromagnetic interferences at a specific frequency, while the requirements may be dynamic during service life. Therefore, a recoverable tuning for the microwave absorption properties in response to an external stimulus would be highly desirable. We herein present a micro/nano-scale hybrid absorber, in which the high-performance Fe@C nanocapsule absorbents are integrated with the porous melamine sponge skeleton, exhibiting multiple merits of lightweight, strong absorption and high elasticity...
June 14, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28605186/synthesis-of-oil-laden-poly-ethylene-glycol-diacrylate-hydrogel-nanocapsules-from-double-nanoemulsions
#6
Mengwen Zhang, Maksymilian Nowak, Paula Malo de Molina, Michael Abramovitch, Katherine Santizo, Samir Mitragotri, Matthew E Helgeson
Multiple emulsions have received great interest due to their ability to be used as templates for the production of multicompartment particles for a variety of applications. However, scaling these complex droplets to nanoscale dimensions has been a challenge due to limitations on their fabrication methods. Here, we report the development of oil-in-water-in-oil (O1/W/O2) double nanoemulsions via a two-step high-energy method and their use as templates for complex nanogels comprised of inner oil droplets encapsulated within a hydrogel matrix...
June 12, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28605156/all-aqueous-nanoprecipitation-spontaneous-formation-of-hydrogen-bonded-nanoparticles-and-nanocapsules-mediated-by-phase-separation-of-poly-n-isopropylacrylamide
#7
Yuhao Wang, Svetlana A Sukhishvili
Spontaneous formation of polymer nanoparticles of well-defined, <100 nm sizes with controlled solid/hollow morphology and fluorescent properties is reported. The nanoparticle formation is assisted by temperature-triggered nucleation of an amphiphilic polymer-poly(N-isopropylacrylamide) (PNIPAM)-and mediated by hydrogen bonding of the emerged nuclei with tannic acid (TA). The pH of solution and TA/PNIPAM ratios are explored as parameters that define TA/PNIPAM assembly. Well-defined nanoparticles are formed in a wide range of neutral pH when the TA/PNIPAM ratio exceeds its critical, pH-dependent value...
June 12, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28583328/3d-printed-tablets-loaded-with-polymeric-nanocapsules-an-innovative-approach-to-produce-customized-drug-delivery-systems
#8
R C R Beck, P S Chaves, A Goyanes, B Vukosavljevic, A Buanz, M Windbergs, A W Basit, S Gaisford
The generation of multi-functional drug delivery systems, namely solid dosage forms loaded with nano-sized carriers, remains little explored and is still a challenge for formulators. For the first time, the coupling of two important technologies, 3D printing and nanotechnology, to produce innovative solid dosage forms containing drug-loaded nanocapsules was evaluated here. Drug delivery devices were prepared by fused deposition modelling (FDM) from poly(ε-caprolactone) (PCL) and Eudragit(®) RL100 (ERL) filaments with or without a channelling agent (mannitol)...
June 3, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28578967/preparation-and-characterization-of-antioxidant-edible-chitosan-films-incorporated-with-epigallocatechin-gallate-nanocapsules
#9
Jin Liang, Hua Yan, Jiuya Zhang, Wenzhong Dai, Xueling Gao, Yibin Zhou, Xiaochun Wan, Pradeep Puligundla
Antioxidant edible films based on chitosan hydrochloride (CHC) and epigallocatechin gallate (EGCG)-loaded nanocapsules (NCs) were developed. The CHC films incorporated with NCs were prepared by a casting method in three different proportions. The obtained films were characterized using the techniques including scanning electron microscopy, Fourier transform infrared spectroscopy and X-ray diffraction. Meanwhile, the mechanical and color properties, optical transmittance, EGCG release profile and antioxidant activity were also determined...
September 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28578960/starch-based-nanocapsules-fabricated-through-layer-by-layer-assembly-for-oral-delivery-of-protein-to-lower-gastrointestinal-tract
#10
Yiping Zhang, Chengdeng Chi, Xiaoyi Huang, Qin Zou, Xiaoxi Li, Ling Chen
Anionic carboxymethyl starch (CMS) and cationic quaternary ammonium starch (QAS), were used to fabricate nanocapsules through electrostatic layer by layer (LbL) alternate deposition onto colloidal BSA particles. An ideal starch-based colloidal nanocapsule was achieved by adjusting the degree of substitution (DS) and weight average molecular molar mass (Mw) of CMS. The nanocapsules fabricated by CMS with lower DS or Mw possessed more compact and stable core-shell structure, which favoured the BSA delivery from the upper gastrointestinal tract (GIT) to the colon...
September 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28577126/nanoencapsulation-improves-scavenging-capacity-and-decreases-cytotoxicity-of-silibinin-and-pomegranate-oil-association
#11
Marila C L Marchiori, Cristina Rigon, Priscila M Copetti, Michele R Sagrillo, Letícia Cruz
Silibinin (SB) and pomegranate oil (PO) present therapeutic potential due to antioxidant activity, but the biological performance of both bioactives is limited by their low aqueous solubility. To overcome this issue, the aim of the present investigation was to develop nanocapsule suspensions with PO as oil core for SB encapsulation, as well as assess their toxicity in vitro and radical scavenging activity. The nanocapsule suspensions were prepared by interfacial deposition of preformed polymer method. SB-loaded PO-based nanocapsules (SBNC) showed an average diameter of 157 ± 3 nm, homogenous size distribution, zeta potential of -14...
June 2, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28561016/light-driven-liquid-metal-nanotransformers-for-biomedical-theranostics
#12
Svetlana A Chechetka, Yue Yu, Xu Zhen, Manojit Pramanik, Kanyi Pu, Eijiro Miyako
Room temperature liquid metals (LMs) represent a class of emerging multifunctional materials with attractive novel properties. Here, we show that photopolymerized LMs present a unique nanoscale capsule structure characterized by high water dispersibility and low toxicity. We also demonstrate that the LM nanocapsule generates heat and reactive oxygen species under biologically neutral near-infrared (NIR) laser irradiation. Concomitantly, NIR laser exposure induces a transformation in LM shape, destruction of the nanocapsules, contactless controlled release of the loaded drugs, optical manipulations of a microfluidic blood vessel model and spatiotemporal targeted marking for X-ray-enhanced imaging in biological organs and a living mouse...
May 31, 2017: Nature Communications
https://www.readbyqxmd.com/read/28559218/argpyrimidine-tagged-rutin-encapsulated-biocompatible-ethylene-glycol-dimers-nanoparticles-application-for-targeted-drug-delivery-in-experimental-diabetes-part-2
#13
Abhishek Bhattacherjee, Abhay Sankar Chakraborti
Diabetes mellitus is characterized by hyperglycemia and associated complications. However, long-term diabetes control is not often sustained by currently available therapeutic approaches. Research on nanoparticle-mediated drug delivery systems is in progress. Here we have tested a ligand (argpyrimidine)-tagged drug (rutin)-encapsulated biocompatible (ethylene glycol dimers) nanoparticle for targeted drug delivery in streptozotocin-induced diabetic rats. Argpyrimidine, being an advanced glycation end product (AGE), directs the nanoparticles to interact with cell surface receptors of AGEs (RAGE) and delivers the drug into the cells...
May 27, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28544960/anti-biofilm-effect-of-dihydromyricetin-loaded-nanocapsules-on-urinary-catheter-infected-by-pseudomonas-aeruginosa
#14
A J F Dalcin, C G Santos, S S Gündel, I Roggia, R P Raffin, A F Ourique, R C V Santos, P Gomes
Nosocomial infections associated with biofilm formation on urinary catheters are among the leading causes of complications due to biofilm characteristics and high antimicrobial resistance. An interesting alternative are natural products, such as Dihydromyricetin (DMY), a flavonoid which presents several pharmacological properties, including strong antimicrobial activity against various microorganisms. However, DMY, has low aqueous solubility and consequently low bioavailability. Nanoencapsulation can contribute to the improvement of characteristics of some drugs, by increasing the apparent solubility and sustained release has been reported among other advantages...
May 15, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28533751/docetaxel-loaded-nanoparticles-assembled-from-%C3%AE-cyclodextrin-calixarene-giant-surfactants-physicochemical-properties-and-cytotoxic-effect-in-prostate-cancer-and-glioblastoma-cells
#15
Laura Gallego-Yerga, Inmaculada Posadas, Cristina de la Torre, Jesús Ruiz-Almansa, Francesco Sansone, Carmen Ortiz Mellet, Alessandro Casnati, José M García Fernández, Valentín Ceña
Giant amphiphiles encompassing a hydrophilic β-cyclodextrin (βCD) component and a hydrophobic calix[4]arene (CA4) module undergo self-assembly in aqueous media to afford core-shell nanospheres or nanocapsules, depending on the nanoprecipitation protocol, with high docetaxel (DTX) loading capacity. The blank and loaded nanoparticles have been fully characterized by dynamic light scattering (DLS), ζ-potential measurements and cryo-transmission electron microscopy (cryo-TEM). The data are compatible with the distribution of the drug between the nanoparticle core and the shell, where it is probably anchored by inclusion of the DTX aromatic moieties in βCD cavities...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28526346/release-study-and-inhibitory-activity-of-thyme-essential-oil-loaded-chitosan-nanoparticles-and-nanocapsules-against-foodborne-bacteria
#16
M Sotelo-Boyás, Z Correa-Pacheco, S Bautista-Baños, Y Gómez Y Gómez
The antibacterial property of thyme essential oil due to different volatile compounds, has been well documented in the literature. To overcome the high volatility of essential oil components, encapsulation has emerged as a new alternative. In this work, chitosan and thyme essential oil-loaded chitosan nanoparticles (TEO-CSNPs) and nanocapsules (TEO-CSNCs) were prepared by nanoprecipitation and nanoencapsulation, respectively. The morphology, encapsulation efficiency, release kinetics, and inhibitory activity were evaluated...
May 16, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28523490/ivermectin-lipid-based-nanocarriers-as-novel-formulations-against-head-lice
#17
Gabriela Ullio-Gamboa, Santiago Palma, Jean Pierre Benoit, Daniel Allemandi, María Inés Picollo, Ariel Ceferino Toloza
The use of pyrethroids to control the human head louse, Pediculus humanus capitis De Geer (Anoplura: Pediculidae), has suffered considerable loss of efficacy due to the evolution of resistance. Thus, the development of efficiently insecticide delivery systems is imperative for the control of head lice. We studied the insecticidal activity of ivermectin-loaded lipid nanocapsules (IVM-LNC) against permethrin-resistant head lice from Argentina. The LNC, prepared by a phase inversion procedure, were characterized in terms of size, surface potential, and physical stability...
May 18, 2017: Parasitology Research
https://www.readbyqxmd.com/read/28521992/tragacanth-nanocapsules-containing-chamomile-extract-prepared-through-sono-assisted-w-o-w-microemulsion-and-uv-cured-on-cotton-fabric
#18
Soraya Ghayempour, Majid Montazer
Encapsulation is the best method to protect the plant extracts against volatility and instability in the presence of air, light, moisture and high temperatures. Nevertheless, application of encapsulated plant extracts on the textiles requires a low-temperature and high rate processing to avoid from breaking or destroying of capsules. The present paper represents application of nanocapsules prepared by ultrasound irradiation assisted W/O/W microemulsion method on the cotton fabric through UV curing method. The surface and structure of nanocapsules and treated cotton fabric using FESEM and FT-IR indicated the spherical nanocapsules with size of 60-80nm stabilized on the fabric surface in a film layer feature...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28521578/improved-photostability-and-cytotoxic-effect-of-coenzyme-q10-by-its-association-with-vitamin-e-acetate-in-polymeric-nanocapsules
#19
Natháli S Pegoraro, Juliane Mattiazzi, Elita F da Silveira, Juliana H Azambuja, Elizandra Braganhol, Letícia Cruz
The present study showed the development of nanocapsules containing the association of the coenzyme Q10 and vitamin E acetate and the evaluation of their effect on in vitro cells culture of malignant glioma and melanoma. In order to investigate if nanocapsules are able to protect coenzyme Q10 from degradation under UVC radiation, a photostability study was carried out. For this, three concentrations of vitamin E acetate were evaluated (1%, 2%, or 3%). Nanocapsules presented suitable physicochemical characteristics and were able to protect coenzyme Q10 from photodegradation...
June 7, 2017: Pharmaceutical Development and Technology
https://www.readbyqxmd.com/read/28517963/novel-strategies-in-vaccine-design-can-nanocapsules-help-prevent-and-treat-hepatitis-b
#20
Stephan Gehring, Anette Pietrzak-Nguyen, Michael Fichter, Katharina Landfester
No abstract text is available yet for this article.
May 18, 2017: Nanomedicine
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