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https://www.readbyqxmd.com/read/29451979/neat-protein-polymer-surfactant-bioconjugates-as-universal-solvents
#1
Anasua Mukhopadhayay, Tarasankar Das, Anindya Datta, Kamendra P Sharma
Solvents particularly those having low-volatility are of great interest for the biocatalytic synthesis of utility chemicals and fuels. Here we show novel and universal solvent-like properties of a neat and water-less polymer surfactant-BSA conjugated material (WL-PSpBSA). This highly viscous, non-volatile material, behaves as a liquid above its solid-liquid transition temperature (≈ 25-27 °C), and can be used as a solvent for variety of completely dry solutes of different sizes, and surface chemistries. We show using a combination of optical microscopy, steady state and time-resolved fluoresence spectroscopy, that dry and powdered dyes (hydrophobic Coumarin 153; C153), enzymes (α-chymotrypsin; α-Chy), or even 2 μm microparticles (diffusion coefficient ca...
February 16, 2018: Biomacromolecules
https://www.readbyqxmd.com/read/29448884/ameliorating-the-in-vivo-antimalarial-efficacy-of-artemether-using-nanostructured-lipid-carriers
#2
Vanka Ravisankar, Gowthamarajan Kuppusamy, Praveen Kumar Simhadri, Uday Krishna Baruah, Veera Venkata Satyanarayana Reddy Karri, Vimal Pandey, Phanithi Prakash Babu
Cerebral malaria (CM) is a fatal neurological complication of Plasmodium falciparum infection that affects children (below five years old) in sub-Saharan Africa and adults in South-East Asia each year having the fatality rate of 10-25%. The survivors of CM also have high risk of long term neurological or cognitive deficits. The objective of the present investigation was to develop optimized nanostructured lipid carriers (NLCs) of artemether (ARM) for enhanced anti-malarial efficacy of ARM.NLCs of ARM were prepared by a combination of high speed homogenization (HSH) and probe sonication techniques...
February 16, 2018: Journal of Microencapsulation
https://www.readbyqxmd.com/read/29448613/a-study-on-h%C3%A2-so%C3%A2-treated-m-x-o-y-catalysts-for-styrenated-phenols-by-alkylation-of-phenol-with-styrene
#3
Hyeonjun Yun, Yeongho Lee, Jangho Cho, Minchul Chung, Sunghun Jung, Wonbong Kwak, Ho-Geun Ahn
Styrenated phenols (SPs) involving very small amount of unreacted phenol and high content of di-SP (DSP) were synthesized, which can be used to prepare SP alkoxylate. The solid catalyst was prepared by impregnation method. SO2-4 on SO2-4/MxOy catalyst was introduced from an aqueous 1M-H2SO4 solution. The catalysts were characterized by XRD patterns, and FT-IR spectra. The catalytic activity was examined by measuring conversion of phenol and styrene in a batch liquid-phase reactor. The concentration of phenol, styrene, and SPs were measured by GC with capillary column...
February 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29448182/enhanced-alumina-recovery-from-secondary-aluminum-dross-for-high-purity-nanostructured-%C3%AE-alumina-powder-production-kinetic-study
#4
Mostafa Mahinroosta, Ali Allahverdi
The numerous ecological problems caused by the accumulation of secondary aluminum dross (SAD) as a hazardous waste generated in aluminum castings have necessitated a need for a sustainable recycling solution. This study proposes a novel and green leaching-based process for recovery of nano-alumina as a highly valuable material from SAD. The leaching phase was performed at atmospheric pressure and low temperature. To obtain optimum conditions for the recovery process, the dissolution kinetics and mechanism of SAD in hydrochloric acid were initially studied under a given liquid-to-solid ratio of 20 ml/g, various reaction temperatures and times...
February 12, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29445821/phase-equilibrium-and-physical-properties-of-biobased-ionic-liquid-mixtures
#5
Ariel A C Toledo Hijo, Guilherme J Maximo, Rosiane L Cunha, Felipe H S Fonseca, Lisandro P Cardoso, Jorge F B Pereira, Mariana C Costa, Eduardo A C Batista, Antonio J A Meirelles
Protic ionic liquid crystals (PILCs) obtained from natural sources are promising compounds due to their peculiar properties and sustainable appeal. However, obtaining PILCs with higher thermal and mechanical stabilities for product and process design is in demand and studies on such approaches using this new IL generation are still scarce. In this context, this work discloses an alternative way for tuning the physicochemical properties of ILCs by mixing PILs. New binary mixtures of PILs derived from fatty acids and 2-hydroxy ethylamines have been synthesized here and investigated through the characterization of the solid-solid-[liquid crystal]-liquid thermodynamic equilibrium and their rheological and critical micellar concentration profiles...
February 15, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29442049/solidification-of-cinnarizine-self-nanoemulsifying-drug-delivery-systems-by-fluid-bed-coating-optimization-of-the-process-and-formulation-variables
#6
A Abdul-Wahhab Shahba, A Riaz Ahmed, K Mohsin, S Ibrahim Abdel-Rahman, F Kaed Alanazi
Self-nanoemulsifying drug delivery systems (SNEDDS) offer an efficient choice to improve the poor dissolution and erratic bioavailability of poorly-water soluble drugs. However, liquid SNEDDS experience some manufacturing and stability limitations. To overcome these limitations, the current study aims to investigate and optimize the solidification of cinnarizine (CN) liquid SNEDDS onto pellets by fluid bed coating. The study involved optimization of process and formulation variables. The coated self-nanoemulsifying pellets (SNEP) were characterized, their droplet size and dissolution profiles were compared to the corresponding liquid SNEDDS...
March 1, 2017: Die Pharmazie
https://www.readbyqxmd.com/read/29436179/frequent-pitfalls-in-the-characterization-of-electrodes-designed-for-the-electrochemical-energy-conversion-and-storage
#7
Aleksandar Zeradjanin
Enormous importance of the energy conversion and storage boosted research interest in various electrocatalytic materials. Characterization of solid/liquid interfaces during faradaic and non-faradaic processes is routinely conducted in many laboratories worldwide on a daily basis. This can be deemed as very positive tendency. However, careful insight into modern literature suggests frequent misuse of electroanalytical tools. This can have very negative implications and postpone overall development of electrocatalytic materials with desired properties...
February 12, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29435669/assessment-of-simple-models-for-molecular-simulation-of-ethylene-carbonate-and-propylene-carbonate-as-solvents-for-electrolyte-solutions
#8
REVIEW
Mangesh I Chaudhari, Ajay Muralidharan, Lawrence R Pratt, Susan B Rempe
Progress in understanding liquid ethylene carbonate (EC) and propylene carbonate (PC) on the basis of molecular simulation, emphasizing simple models of interatomic forces, is reviewed. Results on the bulk liquids are examined from the perspective of anticipated applications to materials for electrical energy storage devices. Preliminary results on electrochemical double-layer capacitors based on carbon nanotube forests and on model solid-electrolyte interphase (SEI) layers of lithium ion batteries are considered as examples...
February 12, 2018: Topics in Current Chemistry (Journal)
https://www.readbyqxmd.com/read/29432812/a-new-ph-responsive-peptide-tag-for-protein-purification
#9
Takahiro Nonaka, Noriko Tsurui, Teruhisa Mannen, Yoshimi Kikuchi, Kentaro Shiraki
This paper describes a new pH-responsive peptide tag that adds a protein reversible precipitation and redissolution character. This peptide tag is a part of a cell surface protein B (CspB) derived from Corynebacterium glutamicum. Proinsulin that genetically fused with a peptide of N-terminal 6, 17, 50, or 250 amino acid residues of CspB showed that the reversible precipitation and redissolution depended on the pH. The transition occurred within a physiological and narrow pH range. A CspB50 tag comprising 50 amino acid residues of N-terminal CspB was further evaluated as a representative using other pharmaceutical proteins...
February 9, 2018: Protein Expression and Purification
https://www.readbyqxmd.com/read/29425938/specific-solubilization-of-impurities-in-culture-media-arg-solution-improves-purification-of-ph-responsive-tag-cspb50-with-teriparatide
#10
Shogo Oki, Takahiro Nonaka, Kentaro Shiraki
Protein purification using non-chromatographic methods is a simple technique that avoids costly resin. Recently, a cell surface protein B (CspB) tag has been developed for a pH-responsive tag for protein purification by solid-liquid separation. Proteins fused with the CspB tag show reversible insolubilization at acidic pH that can be used in solid-liquid separation for protein purification. However, brown-color impurities from co-precipitation hamper further analysis of the target proteins. In this study, we investigated the effect of additives on the co-precipitation of CspB-tagged Teriparatide (CspB50TEV-Teriparatide) expressed in Corynebacterium glutamicum and associated impurities...
February 6, 2018: Protein Expression and Purification
https://www.readbyqxmd.com/read/29421441/simultaneous-determination-of-vitamin-a-25-hydroxyl-vitamin-d3-%C3%AE-tocopherol-in-small-biological-fluids-by-liquid-chromatography-tandem-mass-spectrometry
#11
Haifeng Zhang, Li Quan, Pei Pei, Ye Lin, Chao Feng, Hongyan Guan, Fang Wang, Ting Zhang, Jianxin Wu, Junsheng Huo
A sensitive method for the simultaneous analysis of vitamin A (VA), 25-hydroxyl vitamin D3 (25-OH VD3) and α-tocopherol (VE) in children plasma by liquid chromatography-tandem mass spectrometry (LC-MS/MS) has been developed and validated. Sample preparation chose the solid phase extraction. 100 μL of plasma was mixed with 300 μL ethanol contained 4 μL isotope-labelled analytes. After a series operation, the supernatant was applied to the solid phase extraction (SPE) plate (HLB μElution plate). The eluate was evaporated, and reconstituted in 100 μL methanol...
December 15, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29420892/probing-ionic-liquid-electrolyte-structure-via-the-glassy-state-by-dynamic-nuclear-polarisation-nmr-spectroscopy
#12
Marc-Antoine Sani, Pierre-Alexandre Martin, Ruhamah Yunis, Fangfang Chen, Maria Forsyth, Michael Deschamps, Luke A O'Dell
Dynamic nuclear polarisation (DNP) enhanced solid-state NMR spectroscopy has been used to study an ionic liquid salt solution (N-methyl-N-propyl-pyrrolidinium bis(fluorosulfonyl)imide, C3mpyrFSI, containing 1.0 m lithium bis(fluorosulfonyl)imide, 6LiFSI) in its glassy state at a temperature of 92 K. The incorporation of a biradical to enable DNP signal enhancement allowed the proximities of the lithium to the individual carbon sites on the pyrrolidinium cation to be probed using a 13C-6Li REDOR pulse sequence...
February 8, 2018: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/29420870/application-of-sunflower-stalk-carbon-nitride-nanosheets-as-a-green-sorbent-in-the-solid-phase-extraction-of-polycyclic-aromatic-hydrocarbons-followed-by-hplc
#13
Elnaz Marzi Khosrowshahi, Habib Razmi
A green biocomposite of sunflower stalks and graphitic carbon nitride nanosheets has been applied as a solid-phase extraction adsorbent for sample preparation of five polycyclic aromatic hydrocarbons in different solutions using high-performance liquid chromatography with UV detection. Before the modification, sunflower stalks exhibited relatively low adsorption to the polycyclic aromatic hydrocarbons extraction. The modified sunflower stalks showed increased adsorption to the analytes extraction due to the surface increasing and existence of a π-π interaction between the analytes and graphitic carbon nitride nanosheets on the surface...
February 8, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29417101/ionic-liquids-in-cross-coupling-reactions-liquid-solutions-to-a-solid-precipitation-problem
#14
Hemant Choudhary, Paula Berton, Gabriela Gurau, Allan S Myerson, Robin D Rogers
To alleviate the problem of solid salt precipitation when using inorganic bases in cross-coupling reactions, basic anions were combined with the trihexyl(tetradecyl)phosphonium ([P66614]+) cation to ensure an ionic liquid byproduct. If the starting base is also an ionic liquid, as is the case for [P66614][OH]·4MeOH, it can be used as both base and solvent.
February 8, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29414015/hydrazine-determination-in-allopurinol-using-derivatization-and-spe-for-sample-preparation
#15
Katalin Tamás, Enikő Wachter-Kiss, Róbert Kormány
Hydrazine is a useful building block in the synthesis of organic pharmaceuticals but it is highly toxic so its determination at low ppm range is required. In this work, hydrazine was determined in allopurinol active pharmaceutical ingredient (API) sample at 2.5 ppm level by using derivatization and solid phase extraction (SPE) followed by reversed phase liquid chromatography (RPLC). Hydrazine does not contain chromophore part and is not retained in RPLC thus derivatization was necessary for its determination...
January 26, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29413977/a-validated-uhplc-method-for-the-determination-of-caffeoylquinic-and-di-caffeoylquinic-acids-in-green-coffee-extracts-using-an-rp-amide-fused-core-column
#16
Jakub Fibigr, Michaela Majorová, Hana Kočová Vlčková, Petr Solich, Dalibor Šatínský
The presented work describes the development and validation of a rapid UHPLC-UV method using a fused core particle column with an RP-Amide stationary phase for the separation and quantitative analysis of caffeoylquinic and di-caffeoylquinic acids in green coffee extracts. Three caffeoylquinic acids (3-caffeoylquinic acid, 4-caffeoylquinic acid, and 5-caffeoylquinic acid) and two di-caffeoylquinic acids (1,3-di-caffeoylquinic acid, and 3,5-di-caffeoylquinic acid) were separated and analyzed in 8 min. That was possible due to the unique selectivity of the RP-Amide stationary phase for the analyzed acids...
January 25, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29410431/a-general-soft-enveloping-strategy-in-the-templating-synthesis-of-mesoporous-metal-nanostructures
#17
Jixiang Fang, Lingling Zhang, Jiang Li, Lu Lu, Chuansheng Ma, Shaodong Cheng, Zhiyuan Li, Qihua Xiong, Hongjun You
Metal species have a relatively high mobility inside mesoporous silica; thus, it is difficult to introduce the metal precursors into silica mesopores and suppress the migration of metal species during a reduction process. Therefore, until now, the controlled growth of metal nanocrystals in a confined space, i.e., mesoporous channels, has been very challenging. Here, by using a soft-enveloping reaction at the interfaces of the solid, liquid, and solution phases, we successfully control the growth of metallic nanocrystals inside a mesoporous silica template...
February 6, 2018: Nature Communications
https://www.readbyqxmd.com/read/29406023/simultaneous-determination-of-eight-cyclopolypeptide-antibiotics-in-feed-by-high-performance-liquid-chromatography-coupled-with-evaporation-light-scattering-detection
#18
Xuqin Song, Jingmeng Xie, Meiyu Zhang, Yingxia Zhang, Jiufeng Li, Qiwen Huang, Limin He
A high throughput, reliable and reproducible analysis strategy based on high performance liquid chromatography combined to evaporative light scattering detector (HPLC-ELSD) was developed for simultaneous determination of eight cyclopolypeptide antibiotics including vancomycin, polymyxin B (polymyxin B1 and polymyxin B2), polymyxin E (colistin A and colistin B), teicoplanin, bacitracin A, daptomycin and virginiamycin M1 in animal Feed. Feed samples were extracted with methanol-2% formic acid aqueous solution, followed by a solid-phase extraction step using a HLB cartridge...
February 15, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29400489/structuring-of-fluid-adlayers-upon-ongoing-unimolecular-adsorption
#19
C Schaefer
Fluids with spatial density variations of single or mixed molecules play a key role in biophysics, soft matter, and materials science. The fluid structures usually form via spinodal decomposition or nucleation following an instantaneous destabilization of the initially disordered fluid. However, in practice, an instantaneous quench is often not viable, and the rate of destabilization may be gradual rather than instantaneous. In this work we show that the commonly used phenomenological descriptions of fluid structuring are inadequate under these conditions...
January 19, 2018: Physical Review Letters
https://www.readbyqxmd.com/read/29393947/potential-and-concentration-dependent-self-assembly-structures-at-solid-liquid-interfaces
#20
Zhen-Feng Cai, Hui-Juan Yan, Dong Wang, Li-Jun Wan
We report the potential and concentration controlled assembly of an alkyl-substituted benzo[1,2-b:4,5-b']dithiophene (DDBDT) on an Au(111) electrode by in situ electrochemical scanning tunneling microscopy (ECSTM). It is found that a lamellar structure is formed at low concentrations, while herringbone-like and rhombus structures are obtained at high concentrations. In situ STM results reveal that herringbone-like and rhombus structures could transform into lamellar structures when the electrode potential is tuned negatively...
February 2, 2018: Nanoscale
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