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https://www.readbyqxmd.com/read/28541037/phase-behavior-of-salt-free-polyelectrolyte-gel-surfactant-systems
#1
Martin Andersson, Per Hansson
Ionic surfactants tend to collapse the outer parts of polyelectrolyte gels, forming shells that can be used to encapsulate other species including protein and peptide drugs. In this paper the aqueous phase behaviour of covalently crosslinked polyacrylate networks containing sodium ions and dodecyltrimethylammonium ions as counterions is investigated by means of swelling isotherms, dye staining, small-angle x-ray scattering and confocal Raman spectroscopy. The equilibrium state is approached by letting the networks absorb pure water...
May 25, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28529382/reversibly-manipulating-the-surface-chemistry-of-polymeric-nanostructures-via-a-grafting-to-approach-mediated-by-nucleobase-interactions
#2
Zan Hua, Robert Keogh, Zhen Li, Thomas R Wilks, Guosong Chen, Rachel K O'Reilly
"Grafting to" polymeric nanostructures or surfaces is a simple and versatile approach to achieve functionalization. Herein, we describe the formation of mixed polymer-grafted nanoparticles through a supramolecular "grafting to" method that exploits multiple hydrogen-bonding interactions between the thymine (T)-containing cores of preformed micelles and the complementary nucleobase adenine (A) of added diblock copolymers. To demonstrate this new "grafting to" approach, mixed-corona polymeric nanoparticles with different sizes were prepared by the addition of a series of complementary diblock copolymers containing thermoresponsive poly(N-isopropylacrylamide) (PNIPAM) to a preformed micelle with a different coronal forming block, poly(4-acryloylmorpholine) (PNAM)...
May 9, 2017: Macromolecules
https://www.readbyqxmd.com/read/28527375/surfactant-enhanced-remediation-of-polycyclic-aromatic-hydrocarbons-a-review
#3
REVIEW
Shanti Lamichhane, K C Bal Krishna, Ranjan Sarukkalige
Polycyclic aromatic hydrocarbons (PAHs) are toxic, mutagenic and carcinogenic organic compounds that are widely present in the environment. The bioremediation of PAHs is an economical and environmentally friendly remediation technique, but it is limited because PAHs have low water solubility and fewer bioavailable properties. The solubility and bioavailability of PAHs can be increased by using surfactants to reduce surface tension and interfacial tension; this method is called surfactant-enhanced remediation (SER)...
May 17, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28514015/preparation-of-mesoporous-basic-mixed-metal-oxides-through-assembly-of-monodispersed-mg-al-layered-double-hydroxide-nanoparticles
#4
Yuya Oka, Yoshiyuki Kuroda, Takamichi Matsuno, Keigo Kamata, Hiroaki Wada, Atsushi Shimojima, Kazuyuki Kuroda
Mesoporous basic Mg-Al mixed metal oxides (MMOs) with a high surface area and large pore size were prepared through the assembly of monodispersed layered double hydroxide nanoparticles (LDHNPs) with block copolymer templates. The particle sizes of the LDHNPs were controlled mainly by varying the concentration of tris(hydroxymethyl)aminomethane (THAM), which was used as a surface stabilizing agent for the LDHNPs. LDHNPs and micelles of a block copolymer (Pluronic F127) were assembled to form a composite. The composites were calcined to transform them into mesoporous MMOs and remove the templates...
May 17, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28504251/programmable-co-delivery-of-the-immune-checkpoint-inhibitor-nlg919-and-chemotherapeutic-doxorubicin-via-a-redox-responsive-immunostimulatory-polymeric-prodrug-carrier
#5
Jing-Jing Sun, Yi-Chao Chen, Yi-Xian Huang, Wen-Chen Zhao, Yan-Hua Liu, Raman Venkataramanan, Bin-Feng Lu, Song Li
To achieve synergistic therapeutic efficacy and prevent cancer relapse, chemotherapy and immunotherapy have been combined as a new modality for tumor treatment. In this work, we designed a redox-responsive immunostimulatory polymeric prodrug carrier, PSSN10, for programmable co-delivery of an immune checkpoint inhibitor NLG919 (NLG) and a chemotherapeutic doxorubicin (DOX). NLG-containing PSSN10 prodrug polymers were self-assembled into nano-sized micelles that served as a carrier to load DOX (DOX/PSSN10 micelles)...
May 8, 2017: Acta Pharmacologica Sinica
https://www.readbyqxmd.com/read/28501705/doxorubicin-delivered-by-a-redox-responsive-dasatinib-containing-polymeric-prodrug-carrier-for-combination-therapy
#6
Jingjing Sun, Yanhua Liu, Yichao Chen, Wenchen Zhao, Qianyu Zhai, Sanjay Rathod, Yixian Huang, Suoqin Tang, Yong Tae Kwon, Christian Fernandez, Raman Venkataramanan, Song Li
Two novel prodrug polymers POEG-b-PSSDas (redox-sensitive) and POEG-b-PCCDas (redox-insensitive), which consist of poly(oligo(ethylene glycol) methacrylate) (POEG) hydrophilic blocks and dasatinib (DAS, an oncogenic tyrosine kinases inhibitor) conjugated hydrophobic blocks, were designed as dual-functional carriers for codelivery with doxorubicin (DOX). Both carriers retained antitumor activity of DAS and could form mixed micelles with DOX. Compared to POEG-b-PCCDas micelles, incorporation of disulfide linkage into POEG-b-PSSDas micelles facilitated efficient cleavage of DAS from prodrug micelles in tumor cells/tissues, leading to a higher level of anti-tumor activity in vitro and in vivo...
May 11, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28494698/extemporaneously-preparative-biodegradable-injectable-polymer-systems-exhibiting-temperature-responsive-irreversible-gelation
#7
Yasuyuki Yoshida, Kazuyuki Takata, Hiroki Takai, Keisuke Kawahara, Akinori Kuzuya, Yuichi Ohya
On clinical application of biodegradable injectable polymer (IP) systems, quick extemporaneous preparation of IP formulations and longer duration time gel state after injection into the body are the important targets to be developed. Previously, we had reported temperature-responsive covalent gelation systems via bio-orthogonal thiol-ene reaction by "mixing strategy" of amphiphilic biodegradable tri-block copolymer (tri-PCG) attaching acryloyl groups on both termini (tri-PCG-Acryl) with reactive polythiol. In other previous works, we found "freeze-dry with PEG/dispersion" method as quick extemporaneous preparation method of biodegradable IP formulations...
May 12, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28494589/complexes-covered-with-phosphorylcholine-groups-prepared-by-mixing-anionic-diblock-copolymers-and-cationic-surfactants
#8
Keita Nakai, Kazuhiko Ishihara, Shin-Ichi Yusa
Anionic diblock copolymers (PmAn) composed of biocompatible polybetaine, poly(2-(methacryloyloxy)ethyl phosphorylcholine) (PMPC), and anionic poly(sodium 2-(acrylamido)-2-methylpropane sulfonate) (PAMPS) were synthesized via reversible addition-fragmentation chain transfer (RAFT) radical polymerization. Two types of diblock copolymers (P24A217 and P100A99) were prepared with different compositions. The PmAn/CTAB complexes were formed by a stoichiometrically charge-neutralized mixture of anionic PmAn and cationic cetyltrimethylammonium bromide (CTAB) micelles in water...
May 11, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28485939/creating-quasi-two-dimensional-cluster-assembled-materials-through-self-assembly-of-a-janus-polyoxometalate-silsesquioxane-co-cluster
#9
Han Wu, Yu-Qi Zhang, Min-Biao Hu, Li-Jun Ren, Yue Lin, Wei Wang
Clusters are an important class of nanoscale molecules or superatoms that exhibit an amazing diversity in structure, chemical composition, shape, and functionality. Assembling two types of clusters is creating emerging cluster-assembled materials (CAMs). In this paper, we report an effective approach to produce quasi two-dimensional (2D) CAMs of two types of spherelike clusters, polyhedral oligomeric silsesquioxanes (POSS), and polyoxometalates (POM). To avoid macrophase separation between the two clusters, they are covalently linked to form a POM-POSS cocluster with Janus characteristics and a dumbbell shape...
May 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28481085/harnessing-phosphato-platinum-bonding-induced-supramolecular-assembly-for-systemic-cisplatin-delivery
#10
Yingqin Hou, Yaoyi Wang, Ruijue Wang, Weier Bao, Xiaobo Xi, Yunlong Sun, Sheng-Tao Yang, Wei Wei, Hua Lu
To improve the therapeutic index of cisplatin (CDDP), we present here a new paradigm of drug-induced self-assembly by harnessing phosphato-platinum complexation. Specifically, we show that a phosphato-platinum crosslinked micelle (PpY/Pt) can be generated by using a block copolymer methoxy-poly(ethylene glycol)-block-poly(L-phosphotyrosine) (mPEG-b-PpY). Coating of PpY/Pt with an R9-iRGD peptide by simple mixing affords a targeting micelle with near neutral-charged surface (iPpY/Pt). The micelles features in well-controlled sizes below 50 nm and high stability under physiological conditions, and can withstand various environmental stresses...
May 8, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28475303/synthesis-and-characterization-of-micelle-forming-peg-poly-amino-acid-copolymers-with-iron-hydroxamate-cross-linkable-blocks-for-encapsulation-and-release-of-hydrophobic-drugs
#11
Kevin N Sill, Bradford Sullivan, Adam Carie, J Edward Semple
Described is the development of a polymeric micelle drug delivery platform that addresses the physical property limitations of many nanovectors. The system employs triblock copolymers comprised of a hydrophilic poly(ethylene glycol) (PEG) block, and two poly(amino acid) (PAA) blocks: a stabilizing cross-linking central block, and a hydrophobic drug encapsulation block. Detailed description of synthetic strategies and considerations found to be critical are discussed. Of note, it was determined that the purity of the α-amino acid-N-carboxyanhydrides (NCA) monomers and PEG macroinitiator are ultimately responsible for impurities that arise during the polymerization...
May 11, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28470500/biotoxicity-and-bioavailability-of-hydrophobic-organic-compounds-solubilized-in-nonionic-surfactant-micelle-phase-and-cloud-point-system
#12
Tao Pan, Chunyan Liu, Xinying Zeng, Qiao Xin, Meiying Xu, Yangwu Deng, Wei Dong
A recent work has shown that hydrophobic organic compounds solubilized in the micelle phase of some nonionic surfactants present substrate toxicity to microorganisms with increasing bioavailability. However, in cloud point systems, biotoxicity is prevented, because the compounds are solubilized into a coacervate phase, thereby leaving a fraction of compounds with cells in a dilute phase. This study extends the understanding of the relationship between substrate toxicity and bioavailability of hydrophobic organic compounds solubilized in nonionic surfactant micelle phase and cloud point system...
May 3, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28463476/p-gp-inhibition-and-mitochondrial-impairment-by-dual-functional-nanostructure-based-on-vitamin-e-derivatives-to-overcome-multidrug-resistance
#13
Ruslan G Tuguntaev, Shizhu Chen, Ahmed Shaker Eltahan, Anbu Mozhi, Shubin Jin, Jinchao Zhang, Chan Li, Paul C Wang, Xing-Jie Liang
Vitamin E derivatives possess many essential features for drug-delivery applications, such as biocompatibility, stability, improvement of water solubility of hydrophobic compounds, anticancer activity, and the ability to overcome multidrug resistance (MDR). Herein, vitamin E derivatives are used to overcome MDR through a combined P-glycoprotein (P-gp) inhibition and mitochondrial impairment strategy. A novel nanomicellar drug-delivery system as a carrier for doxorubicin (DOX) was developed, in which d-α-tocopheryl polyethylene glycol 1000 succinate was used as a P-gp inhibitor, α-tocopheryl succinate was introduced as a mitochondrial disrupting agent, and d-α-tocopheryl polyethylene glycol 2000 succinate was used as the main building block of micelles...
May 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28460931/bioaccessibility-and-antioxidant-activity-of-curcumin-after-encapsulated-by-nano-and-pickering-emulsion-based-on-chitosan-tripolyphosphate-nanoparticles
#14
Bakht Ramin Shah, Chunlan Zhang, Yan Li, Bin Li
In the current study the influence of different lipid-based formulations (Pickering and nanoemulsions) and their droplet size on curcumin encapsulation and bioaccessibility, as well as on its anti-oxidant activity was investigated. Oil-in-water Pickering emulsion stabilized by chitosan-tripolyphosphate (CS-TPP) nanoparticles and nanoemulsions containing an organic phase (Span80:Tween80), were prepared with either medium chain triglyceride (MCT) or corn oil as long chain triglyceride (LCT). An in vitro gastrointestinal (GIT) model consisting of mouth, gastric and intestinal phases was used to characterize the rate and extent of lipid phase digestion of the ingested samples...
November 2016: Food Research International
https://www.readbyqxmd.com/read/28460921/potential-physicochemical-basis-of-mediterranean-diet-effect-ability-of-emulsified-olive-oil-to-increase-carotenoid-bioaccessibility-in-raw-and-cooked-tomatoes
#15
Qian Li, Ti Li, Chengmei Liu, Jun Chen, Ruojie Zhang, Zipei Zhang, Taotao Dai, David Julian McClements
Excipient emulsions have compositions and structures specifically designed to increase the bioavailability of nutraceuticals in foods that they are co-ingested with. In this study, olive oil excipient emulsions were shown to significantly increase the bioaccessibility of carotenoids from tomatoes using a simulated gastrointestinal tract (GIT) model (p<0.05): being 8.18±0.93%, 11.85±1.76% for raw tomato-buffer mixture, and cooked tomato-buffer mixture; While being 32.3±2.60%, 55.7±3.28% and 42.6±3.75% for raw tomato-emulsion mixture, cooked tomato-emulsion mixture (boiled together) and cooked tomato- emulsion mixture (tomato boiled alone)...
November 2016: Food Research International
https://www.readbyqxmd.com/read/28457963/development-of-a-local-anesthetic-lidocaine-loaded-redox-active-injectable-gel-for-postoperative-pain-management
#16
Yukio Nagasaki, Yutaro Mizukoshi, Zhenyu Gao, Chitho P Feliciano, Kyungho Chang, Hiroshi Sekiyama, Hiroyuki Kimura
Although local anesthesia is commonly applied for pain relief, there are several issues such as its short duration of action and low effectiveness at the areas of inflammation due to the acidic pH. The presence of excessive amount of reactive oxygen species (ROS) is known to induce inflammation and aggravate pain. To resolve these issues, we developed a redox-active injectable gel (RIG) with ROS-scavenging activity. RIG was prepared by mixing polyamine-b-poly(ethylene glycol)-b-polyamine with nitroxide radical moieties as side chains on the polyamine segments (PMNT-b-PEG-b-PMNT) with a polyanion, which formed a flower-type micelle via electrostatic complexation...
April 27, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28457934/enhanced-apoptosis-survivin-down-regulation-and-assisted-immunochemotherapy-by-curcumin-loaded-amphiphilic-mixed-micelles-for-subjugating-endometrial-cancer
#17
Animesh Kumar, Vijay Kumar Sirohi, Fatima Anum, Pankaj K Singh, Kanchan Gupta, Diksha Gupta, Shubhini A Saraf, Anila Dwivedi, Manish K Chourasia
Survivin is up-regulated in 83% of endometrial cancer leading to resistance development. As endometrial tumor advances, it also elicits chronic inflammation characterized by increased cytokine secretion and immune cells infiltration. The present study was designed to engineer mixed micellar curcumin loaded formulation for investigating survivin down-regulation, its anti-cancer and cytokine modulatory potential against Ishikawa cell lines, an in-vitro model of endometrial cancer. Flory-Huggins interaction parameter (χpd) was applied to predict the compatibility between curcumin and surfactant mixture...
April 27, 2017: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/28456104/influence-of-bile-salt-on-vitamin-e-derived-vesicles-involving-a-surface-active-ionic-liquid-and-conventional-cationic-micelle
#18
Arpita Roy, Sangita Kundu, Rupam Dutta, Nilmoni Sarkar
This study has been actually performed with the aim to develop vitamin E derived vesicles individually from a surface active ionic liquid (1-Hexadecyl-3-Methylimidazolium chloride ([C16mim]Cl)) and a common cationic amphiphile (benzyldimethylhexadecylammonium chloride (BHDC)) and also to investigate their consequent breakdown in presence of bile salt molecule. From this study, it is revealed that the rotational motion of coumarin 153 (C153) molecule is hindered as the vitamin E content is increased in the individual micellar solution of [C16mim]Cl and BHDC...
April 20, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28447464/impact-of-lipid-phase-on-the-bioavailability-of-vitamin-e-in-emulsion-based-delivery-systems-relative-importance-of-bioaccessibility-absorption-and-transformation
#19
Ying Yang, Hang Xiao, David Julian McClements
A simulated gastrointestinal tract/Caco-2 cell culture model was used to investigate the effects of lipid phase type on vitamin E (VE) bioavailability. Oil-in-water emulsions fortified with α-tocopherol acetate were fabricated using a natural emulsifier (quillaja saponin) and long or medium chain triglycerides (LCTs or MCTs) as lipids. The impact of lipid type on VE bioaccessibility, absorption, and transformation was determined. VE bioaccessibility was greater for LCT (46%) than MCT (19%) due to greater solubilization in mixed micelles assembled from longer fatty acids...
May 4, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28443931/the-effect-of-temperature-composition-and-alcohols-on-the-microstructures-of-catanionic-mixtures-of-sodium-dodecylsulfate-and-cetyltrimethylammonium-bromide-in-water
#20
S Rajkhowa, S Mahiuddin, J Dey, S Kumar, V K Aswal, R Biswas, J Kohlbrecher, K Ismail
The influence of mixing protocol, composition, temperature, ageing and added alcohols on the characteristics of the microstructures of sodium dodecylsulfate (SDS) + cetyltrimethylammonium bromide (CTAB) mixtures has been investigated in this paper. In this catanionic mixture (1 weight% total surfactant content) temperature induced microstructural transition occurs, which is (i) a micelle-to-vesicle transition (MVT) if αSDS (mole fraction of SDS) = 0.7, 0.8 or 0.9 and (ii) a vesicle-to-micelle transition (VMT) if αSDS = 0...
April 26, 2017: Soft Matter
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