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https://www.readbyqxmd.com/read/29679751/solubilitydetermination-of-raloxifene-hydrochloride-in-ten-pure-solvents-at-various-temperatures-thermodynamics-based-analysis-and-solute-solvent-interactions
#1
Abdul Ahad, Faiyaz Shakeel, Omar Ali Alfaifi, Mohammad Raish, Ajaz Ahmad, Fahad I Al-Jenoobi, Abdullah M Al-Mohizea
The purpose of the present study was to determine the solubility of raloxifene hydrochloride (RHCl) in ten solvents: water, ethanol, isopropyl alcohol (IPA), ethylene glycol (EG), propylene glycol (PG), polyethylene glycol-400 (PEG-400), Transcutol, 1-butanol, dimethyl sulfoxide (DMSO), and ethyl acetate (EA) at temperatures of 298.2-323.2 K and a pressure of 0.1 MPa. The solubility data obtained was fitted upon "Apelblat and Van't Hoff" equations. The maximum mole fraction solubility of RHCl was obtained in DMSO (5...
April 18, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29679323/layer-by-layer-engineered-polymer-capsules-for-therapeutic-delivery
#2
Rona Chandrawati
Polymer capsules fabricated via layer-by-layer (LbL) assembly have emerged as promising carriers for therapeutic delivery. The versatile assembly technique allows an extensive choice of materials to be incorporated as constituents of the multilayers, which therefore endow capsules with specific properties and functionalities. This chapter describes protocols for fabrication of LbL-engineered poly(methacrylic acid) (PMA) capsules for applications in gene delivery, including (1) synthesis of building blocks, (2) cargo encapsulation, (3) multilayer film formation, (4) surface modification, and (5) cross-linking of multilayer films and dissolution of particle templates...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29679239/comparative-analysis-of-the-root-transcriptomes-of-cultivated-and-wild-rice-varieties-in-response-to-magnaporthe-oryzae-infection-revealed-both-common-and-species-specific-pathogen-responses
#3
Lei Tian, Shaohua Shi, Fahad Nasir, Chunling Chang, Weiqiang Li, Lam-Son Phan Tran, Chunjie Tian
BACKGROUND: Magnaporthe oryzae, the causal fungus of rice blast disease, negatively impacts global rice production. Wild rice (Oryza rufipogon), a relative of cultivated rice (O. sativa), possesses unique attributes that enable it to resist pathogen invasion. Although wild rice represents a major resource for disease resistance, relative to current cultivated rice varieties, no prior studies have compared the immune and transcriptional responses in the roots of wild and cultivated rice to M...
April 20, 2018: Rice
https://www.readbyqxmd.com/read/29677821/tailor-made-electrospun-multilayer-composite-polymer-electrolytes-for-high-performance-lithium-polymer-batteries
#4
Du-Hyun Lim, Anupriya K Haridas, Stelbin Peter Figerez, Prasanth Raghavan, Aleksandar Matic, Jou-Hyeon Ahn
A novel tailor-made multilayer composite polymer electrolyte, consisting of two outer layers of electrospun polyacrylonitrile (PAN) and one inner layer of poly(vinyl acetate) (PVAc)/poly(methyl methacrylate) (PMMA)/poly(ethylene oxide) (PEO) fibrous membrane, was prepared using continuous electrospinning. These membranes, which are made up of fibers with diameters in the nanometer range, were stacked in layers to produce interconnected pores that result in a high porosity. Gel polymer electrolytes (GPEs) were prepared by entrapping a liquid electrolyte (1 M LiPF6 in ethylene carbonate/dimethyl carbonate) in the membranes...
September 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29677819/effects-of-electrolyte-concentration-on-surface-film-formation-on-graphite-in-ethylene-carbonate-based-solutions
#5
Soon-Ki Jeong, Dong-Gui Choi
The physicochemical properties of a surface film generated on a graphite surface were greatly dependent on the concentration of the electrolyte solution. Cyclic voltammetry results obtained using four ethylene carbonate-based solutions of different electrolyte (i.e., LiN(SO2C2F5)2) concentrations showed that the amount of irreversible current used to generate the surface film between 0.8 and 0.1 V decreased upon increasing the electrolyte concentration. Transmission electron microscopy results revealed that the thickness and morphology of the surface film were greatly affected by the concentration of the electrolyte solution...
September 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29677613/swollen-mixed-pluronic-surfactant-micelles-as-templates-for-mesoporous-nanotubes-with-diverse-bridged-organosilica-frameworks
#6
Manik Mandal, George Farid, Michal Kruk
Bridged-organosilica nanotubes with a variety of bridging groups (methylene, ethylene, ethenylene, phenylene and p-xylylene) were synthesized using swollen mixtures of Pluronic triblock copolymer surfactants as micellar templates. The mixtures consisted of Pluronic F127 surfactant (EO106 PO70 EO106 ) with long poly(ethylene oxide), PEO, blocks, which help prevent the formation of consolidated structures, and another Pluronic with shorter PEO blocks and higher poly(propylene oxide) content, which promote swelling and the cylindrical micelle morphology...
April 4, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29677595/bioherbicides-current-knowledge-on-weed-control-mechanism
#7
REVIEW
Ramalingam Radhakrishnan, Abdulaziz A Alqarawi, Elsayed Fathi Abd Allah
Weed control is a challenging event during crop cultivation. Integrated management, including the application of bioherbicides, is an emerging method for weed control in sustainable agriculture. Plant extracts, allelochemicals and some microbes are utilized as bioherbicides to control weed populations. Bioherbicides based on plants and microbes inhibit the germination and growth of weeds; however,few studies conducted in weed physiology. This review ascribes the current knowledge of the physiological changes in weeds that occur during the exposure to bioherbicides...
April 17, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29677448/self-assembled-ph-responsive-polymeric-micelles-for-highly-efficient-non-cytotoxic-delivery-of-doxorubicin-chemotherapy-to-inhibit-macrophage-activation-in-vitro-investigation
#8
Zhi-Sheng Liao, Shan-You Huang, Jyun-Jie Huang, Jem-Kun Chen, Ai-Wei Lee, Juin-Yih Lai, Duu-Jong Lee, Chih-Chia Cheng
Self-assembled pH-responsive polymeric micelles, a combination of hydrophilic poly(ethylene glycol) segments and hydrogen bonding interactions within a biocompatible polyurethane substrate, can spontaneously self-assemble into highly controlled, nanosized micelles in aqueous solution. These newly-developed micelles exhibit excellent pH-responsive behavior and biocompatibility, highly controlled drug (doxorubicin; DOX) release behavior and high drug encapsulation stability in different aqueous environments, making the micelles highly attractive potential candidates for safer, more effective drug delivery in applications such as cancer chemotherapy...
April 20, 2018: Biomacromolecules
https://www.readbyqxmd.com/read/29676569/in-situ-polymorphic-alteration-of-filler-structures-for-biomimetic-mechanically-adaptive-elastomer-nanocomposites
#9
Tamil Selvan Natarajan, Shigeru Okamoto, Klaus Werner Stöckelhuber, Sven Wiessner, Uta Reuter, Dieter Fischer, Anik Ghosh, Gert Heinrich, Amit Das
A mechanically adaptable elastomer composite is prepared with reversible soft-stiff properties that can be easily controlled. By the exploitation of different morphological structures of calcium sulphate, which is acting as active filler in soft elastomer matrix, the magnitude of filler reinforcement can be reversibly altered that will be reflected in changes of the final stiffness of the material. The higher stiffness, in other words, the higher modulus of the composites, is realized by the in-situ development of fine nano-structured calcium sulphate di-hydrate crystals, which are formed during exposure to water and, further, this highly reinforcing crystals can be transformed to a non-reinforcing hemi-hydrate mesocrystalline structure by simply heating the system in a controlled way...
April 20, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29675667/mpeg-pcl-copolymeric-micelles-for-encapsulation-of-azithromycin
#10
Wenxiu Wei, Shida Li, Hongmei Xu, Feilong Zhou, Yi Wen, Zhimei Song, Sijia Feng, Runliang Feng
Macrolide antibiotics are lipophilic drugs with some limitations including low solubility, limited cellular permeation, patients discomfort, etc. With amphiphilic methoxy poly(ethylene glycol)-b-poly(ε-caprolactone) (MPEG-PCL) copolymer and azithromycin (AZT) as drug carrier and model drug, AZT-loaded micelles were prepared via thin-membrane hydration method in order to overcome these limitations. Encapsulation efficiency of AZT-loaded micelles was 94.40% with good storage stability for 28 days, and AZT's water solubility was enhanced to 944 μg/mL...
April 19, 2018: AAPS PharmSciTech
https://www.readbyqxmd.com/read/29675520/designing-well-defined-photopolymerized-synthetic-matrices-for-three-dimensional-culture-and-differentiation-of-induced-pluripotent-stem-cells
#11
Elisa M Ovadia, David W Colby, April M Kloxin
Induced pluripotent stem cells (iPSCs) are of interest for the study of disease, where these cells can be derived from patients and have the potential to be differentiated into any cell type; however, three-dimensional (3D) culture and differentiation of iPSCs within well-defined synthetic matrices for these applications remains limited. Here, we aimed to establish synthetic cell-degradable hydrogels that allow precise presentation of specific biochemical cues for 3D culture of iPSCs with relevance for hypothesis testing and lineage-specific differentiation...
April 20, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/29675029/aaein3-mediates-the-downregulation-of-artemisinin-biosynthesis-by-ethylene-signaling-through-promoting-leaf-senescence-in-artemisia-annua
#12
Yueli Tang, Ling Li, Tingxiang Yan, Xueqing Fu, Pu Shi, Qian Shen, Xiaofen Sun, Kexuan Tang
Artemisinin is an important drug for malaria treatment, which is exclusively produced in Artemisia annua . It's important to dissect the regulatory mechanism of artemisinin biosynthesis by diverse plant hormones and transcription factors. Our study shows ethylene, a plant hormone which accelerates flower and leaf senescence and fruit ripening, suppressed the expression of genes encoding three key enzymes ADS, DBR2, CYP71AV1, and a positive regulator AaORA involved in artemisinin biosynthesis. Then we isolated the gene encoding ETHYLENE-INSENSITIVE3 (EIN3), a key transcription factor in ethylene signaling pathway, by screening the transcriptome and genome database from Artemisia annua , named AaEIN3 ...
2018: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29674293/protein-adsorption-and-macrophage-uptake-of-zwitterionic-sulfobetaine-containing-micelles
#13
Aijing Lu, Zhengzhong Wu, Xianglin Luo, Suming Li
Micelles of poly(ε-caprolactone)-b-poly(N,N-diethylaminoethyl methacrylate)/(N-(3-sulfopropyl-N-methacryloxyethy-N,N-diethylammonium betaine)) (PCL-PDEAPS) and poly(ε-caprolactone)-b-poly(ethylene glycol) (PCL-PEG) were prepared and characterized. The interactions of micelles with model proteins such as bovine serum albumin (BSA), lysozyme (Ly), fibrinogen (Fg) and plasma were studied from adsorption quantity, micelle size, polydispersity index (PDI) and zeta-potential measurements. The adsorption quantity of negatively charged proteins on PCL-PDEAPS micelles containing zwitterionic sulfobetaine is larger than on non-ionic PEG-PCL micelles...
April 9, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29674231/photoinduced-peg-deshielding-from-ros-sensitive-linkage-bridged-block-copolymer-based-nanocarriers-for-on-demand-drug-delivery
#14
Jie Li, Chunyang Sun, Wei Tao, Ziyang Cao, Haisheng Qian, Xianzhu Yang, Jun Wang
Controlling poly(ethylene glycol) (PEG) shielding/deshielding at the desired site of action exhibits great advantages for nanocarrier-based on-demand drug delivery in vivo. However, the current PEG deshielding strategies were mainly designed for anticancer drug delivery; even so, their applications are also limited by tumor heterogeneity. As a proof-of-concept, we explored a photoinduced PEG deshielding nanocarrier TK-NPCe6&PTX to circumvent the aforementioned challenge. The TK-NPCe6&PTX encapsulating chlorin e6 (Ce6) and paclitaxel (PTX) was self-assembled from an innovative thioketal (TK) linkage-bridged diblock copolymer of PEG with poly(d,l-lactic acid) (PEG-TK-PLA)...
April 10, 2018: Biomaterials
https://www.readbyqxmd.com/read/29674087/an-on-line-system-using-ion-imprinted-polymer-for-preconcentration-and-determination-of-bismuth-in-seawater-employing-atomic-fluorescence-spectrometry
#15
Caio S A Felix, Darllen G Silva, Heloysa M C Andrade, Valeria B Riatto, Mauricio M Victor, Sergio L C Ferreira
This work proposes an on-line preconcentration system using ion-imprinted polymer (IIP) for determination of bismuth in seawater employing atomic fluorescence spectrometry (AFS). The polymer was synthesized using 2- (5-bromo-2-pyridylazo) -5-diethylaminophenol (Br-PADAP) for complex formation, ethylene glycol dimethacrylate (EGDMA), cross-linking reagent and methacrylic acid (AMA) reagents, used as the functional monomer, 2,2-azobisisobutyronitrile was used as the radical initiator. The polymer was characterized employing the Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM)...
July 1, 2018: Talanta
https://www.readbyqxmd.com/read/29674062/development-of-on-line-monolith-based-in-tube-solid-phase-microextraction-for-the-sensitive-determination-of-triazoles-in-environmental-waters
#16
Jinling Pang, Meng Mei, Dongxing Yuan, Xiaojia Huang
In this work, a convenient and sensitive method for the determination of triazoles in environmental waters was developed by on-line combining in-tube solid phase microextraction (IT-SPME) and high performance liquid chromatography with diode array detector (HPLC-DAD). To extract triazoles effectively, poly (4-vinyl pyridine-co-ethylene dimethacrylate) monolith was in-situ fabricated and utilized as the extraction phase of IT-SPME. A series of key extraction parameters including desorption solvent, sample volume, adsorption and desorption flow rate, pH value and ionic strength in sample matrix were optimized thoroughly...
July 1, 2018: Talanta
https://www.readbyqxmd.com/read/29674047/magnetic-molecularly-imprinted-polymer-for-the-selective-extraction-of-hesperetin-from-the-dried-pericarp-of-citrus-reticulata-blanco
#17
Dan-Dan Wang, Die Gao, Wan-Jun Xu, Fan Li, Man-Ni Yin, Qi-Feng Fu, Zhi-Ning Xia
In present study, novel magnetic molecularly imprinted polymers for hesperetin were successfully prepared by surface molecular imprinting method using functionalized Fe3 O4 particles as the magnetic cores. Hesperetin as the template, N-Isopropylacrylamide as the functional monomer, ethylene glycol dimethyl acrylate as the crosslinker, 2,2-azobisisobutyonnitrile as initiator and acetonitrile-methanol (3:1, v/v) as the porogen were applied in the preparation process. Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscope, x-ray diffraction and vibrating sample magnetometry were applied to characterize the magnetic molecularly imprinted polymers...
July 1, 2018: Talanta
https://www.readbyqxmd.com/read/29674042/qbd-approach-by-computer-aided-design-and-response-surface-methodology-for-molecularly-imprinted-polymer-based-on-magnetic-halloysite-nanotubes-for-extraction-of-norfloxacin-from-real-samples
#18
Meriem Fizir, Liu Wei, Niu Muchuan, Asma Itatahine, Yamina Ait Mehdi, Hua He, Pierre Dramou
This article describes the development, optimization, and evaluation of a novel composite imprinted polymer, on the basis of magnetic halloysite nanotubes (MHNTs-MIPs) using "Quality by Design (QbD)" approach combining computer simulation and response surface methodology. Norfloxacin, methacrylic acid, and ethylene glycol dimethacrylate were used as template, functional monomer and cross-linker, respectively. As a comparison, two MHNTs-MIPs have been prepared with the most suitable functional monomer methacrylic acid (MAA) along with acrylamide (AM)...
July 1, 2018: Talanta
https://www.readbyqxmd.com/read/29674030/molecularly-imprinted-polymer-for-determination-of-lumefantrine-in-human-plasma-through-chemometric-assisted-solid-phase-extraction-and-liquid-chromatography
#19
Pedro Henrique Reis da Silva, Melina Luiza Vieira Diniz, Gerson Antônio Pianetti, Isabela da Costa César, Maria Elisa Scarpelli Ribeiro E Silva, Roberto Fernando de Souza Freitas, Ricardo Geraldo de Sousa, Christian Fernandes
Lumefantrine is the first-choice treatment of Falciparum uncomplicated malaria. Recent findings of resistance to lumefantrine has brought attention for the importance of therapeutic monitoring, since exposure to subtherapeutic doses of antimalarials after administration is a major cause of selection of resistant parasites. Therefore, this study focused on the development of innovative, selective, less expensive and stable molecularly imprinted polymers (MIPs) for solid-phase extraction (SPE) of lumefantrine from human plasma to be used in drug monitoring...
July 1, 2018: Talanta
https://www.readbyqxmd.com/read/29673805/effect-of-n-acetylgalactosamine-ligand-valency-on-targeting-dendrimers-to-hepatic-cancer-cells
#20
Sibu P Kuruvilla, Gopinath Tiruchinapally, Neha Kaushal, Mohamed E H ElSayed
The display of N-acetylgalactosamine (NAcGal) ligands has shown great potential in improving the targeting of various therapeutic molecules to hepatocellular carcinoma (HCC), a severe disease whose clinical treatment is severely hindered by limitations in delivery of therapeutic cargo. We previously used the display of NAcGal on generation 5 (G5) polyamidoamine (PAMAM) dendrimers connected through a poly(ethylene glycol) (PEG) brush (i.e. G5-cPEG-NAcGal; monoGal) to effectively target hepatic cancer cells and deliver a loaded therapeutic cargo...
April 16, 2018: International Journal of Pharmaceutics
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