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https://www.readbyqxmd.com/read/28239720/superwetting-comonomers-reduce-adhesion-of-e-coli-bl21
#1
Madiha F Khan, Nicholas Luong, Jerry Kurian, Michael A Brook
The adhesion of Escherichia coli to copolymers of methacrylates and a trisiloxane-polyether acrylate surfactant was found to be at a minimum with copolymers containing a low (20%) fraction of the surfactant monomer. Rather than wettability, hardness, or water uptake, adhesion was found to be limited by the presence of low concentrations of bound surfactant that can interact with hydrophobic domains on the bacterium inhibiting anchoring to the polymer surface.
February 27, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28239705/chemical-communication-and-dynamics-of-droplet-emulsions-in-networks-of-belousov-zhabotinsky-micro-oscillators-produced-by-microfluidics
#2
Kristian Torbensen, Federico Rossi, Sandra Ristori, Ali Abou-Hassan
Chemical communication leading to synchronization and collective behaviour of dynamic elements, such as cell colonies, is a widespread phenomenon with biological, physical and chemical importance. Such synchronization between elements proceeds via chemical communication by emmision, interdiffusion and reception of specific messenger molecules. On a lab scale, these phenomena can be modeled by encapsulating an oscillating chemical reaction, which serves as a signal (information) sender/receiver element, inside microcompartments such as droplet emulsions, liposomes and polymersomes...
February 27, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28238914/biochemical-and-biophysical-properties-of-a-metagenome-derived-gh5-endoglucanase-displaying-an-unconventional-domain-architecture
#3
Agnes C Pimentel, Gabriela C G Ematsu, Marcelo V Liberato, Douglas A A Paixão, João Paulo L Franco Cairo, Fernanda Mandelli, Robson Tramontina, César A Gandin, Mario de Oliveira Neto, Fabio M Squina, Thabata M Alvarez
Endoglucanases are key enzymes in the degradation of cellulose, the most abundant polymer on Earth. The aim of this work was to perform the biochemical and biophysical characterization of CelE2, a soil metagenome derived endoglucanase. CelE2 harbors a conserved domain from glycoside hydrolase family 5 (GH5) and a C-terminal domain with identity to Calx-beta domains. The recombinant CelE2 displayed preference for hydrolysis of oat beta-glucan, followed by lichenan and carboxymethyl cellulose. Optimum values of enzymatic activity were observed at 45°C and pH 5...
February 23, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28238638/critical-review-on-biosurfactant-analysis-purification-and-characterization-using-rhamnolipid-as-a-model-biosurfactant
#4
REVIEW
Sunita J Varjani, Vivek N Upasani
Surfactants are one of the most versatile group of chemicals used in various industrial processes. Their market is competitive, and manufacturers will have to expand surfactant production in ecofriendly and cost effective manner. Increasing interest in biosurfactants led to an intense research for environment friendly and cost-efficient production of biosurfactant. Structural diversity and functional properties of biosurfactants make them an attractive group of compounds for potential use in wide variety of industrial, environmental and biotechnological applications...
February 16, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28236822/a-simple-two-step-cloud-point-extraction-process-for-removing-fluorescent-whitening-agents-vbl-in-industrial-wastewater-and-recycling-of-surfactant
#5
Juan Han, Xu Tang, Yun Wang, Jing Li, Liang Ni, Lei Wang
  With the enhancement of people's environmental consciousness, the treatment of wastewater was studied as the focus of this paper. Here we present a simple two-step extraction to realize efficient separation of fluorescent whitening agents VBL and cyclic utilization of surfactant to reduce the cost of wastewater treatment and environmental pollution. Firstly, the removal of VBL has been achieved by CPE using TX-114 as nonionic surfactant. The results showed that complete extraction was possible using 1% (w/w) TX-114 for VBL concentration not exceeding 17...
March 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28236819/ultrasonic-destruction-of-acid-orange-7-effect-of-humic-acid-surfactants-and-complex-matrices
#6
Oualid Hamdaoui, Slimane Merouani
  The ultrasonic degradation at 600 kHz of an azo dye, acid orange 7 (AO7), in the presence of various dissolved natural organic matters (humic acid and surfactants) and in environmentally relevant matrices (natural water and seawater) was investigated. Additionally, the dependence of AO7 degradation on several operating parameters was clarified. The obtained results showed that ultrasound completely destroyed AO7 in 90 min of treatment but only 10% of TOC was removed after a long irradiation time. Investigations using the radical scavengers tert-butyl alcohol and KI revealed that AO7 degradation proceeds through radical reactions occurring at the bubble-liquid interface...
March 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28236691/nicotine-based-surface-active-ionic-liquids-synthesis-self-assembly-and-cytotoxicity-studies
#7
Gurbir Singh, Raman Kamboj, Venus Singh Mithu, Vinay Chauhan, Taranjeet Kaur, Gurcharan Kaur, Sukhprit Singh, Tejwant Singh Kang
New ester-functionalized surface active ionic liquids (SAILs) based on nicotine, [CnENic][Br] (n=8, 10 and 12), with bromide counterions have been synthesized, characterized and investigated for their self-assembly behavior in aqueous medium. Conductivity measurements in aqueous solutions of the investigated SAILs have provided information about their critical micelle concentration (cmc), and degree of counterion binding (β), where cmc was found to be 2-3-fold lower than homologous SAILs or conventional cationic surfactants...
February 12, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28236690/binding-interaction-of-sodium-n-dodecanoyl-sarcosinate-with-hemoglobin-and-myoglobin-physicochemical-and-spectroscopic-studies-with-molecular-docking-analysis
#8
Suparna Rudra, Somnath Dasmandal, Ambikesh Mahapatra
The interaction of an amino acid surfactant, sodium-N-dodecanoyl sarcosinate (SDDS), with two heme proteins, hemoglobin (Hb) and myoglobin (Mb), has been studied employing various physicochemical and spectroscopic techniques like tensiometry, UV-Vis spectroscopy, steady-state fluorometry, time-resolved fluorometry, circular dichroism (CD) spectroscopy, calorimetry and stopped flow kinetics at physiological pH of 7.2 and 298K. Tensiometric and fluorometric analysis suggest that the interaction between SDDS and protein starts with the monomer form of the surfactant which produces small induced micelles...
February 16, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28236269/the-development-of-self-nanoemulsifying-liquisolid-tablets-to-improve-the-dissolution-of-simvastatin
#9
Shaimaa Elkadi, Samar Elsamaligy, Saleh Al-Suwayeh, Hanaa Mahmoud
The aim of this work was to develop self-nanoemulsifying liquisolid tablets (SNELT) to enhance the dissolution profile of poorly water-soluble simvastatin. SNELT present a unique technique of incorporating self-nanoemulsifying drug delivery systems (SNEDDS) into tablets. Optimized SNEDDS containing different oils, Cremophor(®) RH 40 (surfactant) and Transcutol(®) HP (co-surfactant), at different ratios, were used as liquid vehicles and loaded on carrier material, microcrystalline cellulose (MCC), and coating material, Cab-o-sil(®) H-5 (nanosize colloidal silicon dioxide) powders at different loading factors (L f ) and fixed excipient ratio (R = 20)...
February 24, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28236110/shear-induced-structural-and-thermodynamic-phase-transitions-in-micellar-systems
#10
Angelina Martín Del Campo, J Paulo García-Sandoval, J F Armando Soltero, Fernando Bautista, Octavio Manero, Jorge E Puig
In this contribution a methodology to compute and classify shear-induced structural and phase transitions in surfactant/water mixtures from rheological measurements is presented. Non-linear rheological experiments, considering variations in surfactant concentration and temperature, are analyzed. In particular, the parameters of the BMP (Bautista-Manero-Puig) model, obtained from the fitting of the shear stress versus shear rate data, which are functions of surfactant concentration and temperature, allow classifying structural and phase transition boundaries...
February 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28235723/bypassing-multidrug-resistant-ovarian-cancer-using-ultrasound-responsive-doxorubicin-curcumin-co-deliver-alginate-nanodroplets
#11
Fatemeh Baghbani, Fathollah Moztarzadeh
Ultrasound-responsive perfluorocarbon nanoemulsions are a class of new multifunctional smart nanocarriers which combine diagnostic properties with therapeutic properties and release their drug payload in a controlled manner in response to ultrasound. Therefore, combination therapy using chemotherapeutic and chemosensitizing agents co-entrapped in these nanocarriers seems beneficial for cancer treatment. In the present study, multifunctional smart alginate/perfluorohexane nanodroplets were developed for co-delivery of doxorubicin and curcumin (a strong chemosensitizer)...
February 2, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28235590/rational-design-of-polyarginine-nanocapsules-intended-to-help-peptides-overcoming-intestinal-barriers
#12
Zhigao Niu, Erik Tedesco, Federico Benetti, Aloïse Mabondzo, Isabella Monia Montagner, Ilaria Marigo, David Gonzalez-Touceda, Sulay Tovar, Carlos Diéguez, Manuel J Santander-Ortega, María J Alonso
The aim of this work was to rationally design and characterize nanocapsules (NCs) composed of an oily core and a polyarginine (PARG) shell, intended for oral peptide delivery. The cationic polyaminoacid, PARG, and the oily core components were selected based on their penetration enhancing properties. Insulin was adopted as a model peptide to assess the performance of the NCs. After screening numerous formulation variables, including different oils and surfactants, we defined a composition consisting of oleic acid, sodium deoxycholate (SDC) and Span 80...
February 21, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28235448/ir-spectroscopy-analysis-of-pancreatic-lipase-related-protein-2-interaction-with-phospholipids-1-discriminative-recognition-of-mixed-micelles-versus-liposomes
#13
Eduardo Mateos-Diaz, Jean-Claude Bakala N'Goma, Deborah Byrne, Sylvie Robert, Frédéric Carrière, Hélène Gaussier
Guinea pig pancreatic lipase-related protein 2 (GPLRP2) is an interesting model enzyme that can hydrolyze a large set of acylglycerols in vitro but displays however some selectivity depending on the supramolecular structure of substrate and the presence of surfactants like bile salts. We showed that GPLRP2 hydrolyzes 1,2-Dipalmitoyl phosphatidylcholine (DPPC) present in mixed micelles with sodium taurodeoxycholate (NaTDC) but not in multilamellar (MLV) and large unilamellar (LUV) vesicles of DPPC. After characterization of these lipid aggregates by dynamic light scattering (DLS), the discriminative recognition of DPPC in DPPC/NaTDC micelles versus MLV and LUV by an inactive variant (S152G) of GPLRP2 to avoid the effect of substrate hydrolysis was investigated using Fourier transform infrared spectroscopy (FTIR)...
February 21, 2017: Chemistry and Physics of Lipids
https://www.readbyqxmd.com/read/28231499/surfactant-cobalt-iii-complexes-the-impact-of-hydrophobicity-on-interaction-with-hsa-and-dna-insights-from-experimental-and-theoretical-approach
#14
Selvakumar Veeralakshmi, Gopal Sabapathi, Selvan Nehru, Ponnambalam Venuvanalingam, Sankaralingam Arunachalam
To develop surfactant-based metallodrugs, it is very important to know about their hydrophobicity, micelle forming capacity, their interaction with biomacromolecules such as proteins and nucleic acids, and biological activities. Here, diethylenetriamine (dien) and tetradecylamine ligand (TA) based surfactant-cobalt(III) complexes with single chain domain, [Co(dien)(TA)Cl2]ClO4 (1) and double chain domain [Co(dien)(TA)2Cl](ClO4)2 (2) were chosen to study the effect of hydrophobicity on the interaction with human serum albumin and calf thymus DNA...
February 16, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28230971/multifaceted-gold-palladium-bimetallic-nanorods-and-their-geometric-compositional-and-catalytic-tunabilities
#15
Lichao Sun, Qingfeng Zhang, Guangfang Grace Li, Esteban Villarreal, Xiaoqi Fu, Hui Wang
Kinetically controlled, seed-mediated coreduction provides a robust and versatile synthetic approach to multimetallic nanoparticles with precisely controlled geometries and compositions. Here we demonstrate that single-crystalline cylindrical Au nanorods selectively transform into a series of structurally distinct Au@Au-Pd alloy core-shell bimetallic nanorods with exotic multifaceted geometries enclosed by specific types of facets upon seed-mediated Au-Pd coreduction under diffusion controlled conditions. By adjusting several key synthetic parameters, such as the Pd/Au precursor ratio, the reducing agent concentration, the capping surfactant concentration, and foreign metal ion additives, we have been able to simultaneously fine-tailor the atomic-level surface structures and fine-tune the compositional stoichiometries of the multifaceted Au-Pd bimetallic nanorods...
February 23, 2017: ACS Nano
https://www.readbyqxmd.com/read/28230873/long-stokes-shifts-and-vibronic-couplings-in-perfluorinated-polyanilines
#16
Panagiotis Dallas, Ilija Rašović, Tim Puchtler, Robert A Taylor, Kyriakos Porfyrakis
We report the effect of surfactant addition on the optical properties of perfluorinated polyanilines synthesized through liquid-liquid interfaces. We obtained very long Stokes shifts, 205 nm, for oligomers derived from a hydrofluoroether-water system in the presence of Triton X-100 as a surfactant, and vibronic fine features from a toluene-water system.
February 23, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28230285/modeling-lung-surfactant-interactions-with-benzo-a-pyrene
#17
Jacek Korchowiec, Anna Stachowicz-Kusnierz, Sonia Trojan, Lukasz Cwiklik, Beata Korchowiec
By reducing surface tension of the air-water interface in alveoli, lung surfactant (LS) is crucial for proper functioning of the lungs. It also forms the first barrier against inhaled pathogens. In this study we inspect the interactions of LS models with a dangerous air pollutant, benzo[a]pyrene (BaP). DPPC, POPC and their 1:1 mixture are used as LS models. Pressure-area isotherms are employed to study macroscopic properties of the monolayers. We find that addition of BaP has a condensing effect, manifested by lowering the values of surface pressure and shifting the isotherms to smaller areas...
February 23, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28229944/development-and-in-vivo-evaluation-of-an-innovative-hydrochlorothiazide-in-cyclodextrins-in-solid-lipid-nanoparticles-formulation-with-sustained-release-and-enhanced-oral-bioavailability-for-potential-hypertension-treatment-in-pediatrics
#18
Marzia Cirri, Natascia Mennini, Francesca Maestrelli, Paola Mura, Carla Ghelardini, Lorenzo di Cesare Mannelli
An innovative pediatric oral formulation of hydrochlorothiazide (HCT) (2mg/mL), endowed with improved bioavailability and sustained release properties and suitable for the hypertension treatment in pediatric patients, was developed by combining the drug-cyclodextrin complexation and the incorporation of the complex into Solid Lipid Nanoparticles (SLN). Precirol(®)ATO5-based SLN, with two different surfactants (Pluronic(®)F68 and Tween(®)80) loaded with the drug as such or as binary system with hydroxypropyl-beta-cyclodextrin (HPβCd) and sulfobutyl-ether-beta-cyclodextrin (SBEβCd) both as physical mixture (P...
February 14, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28229943/in-situ-hybrid-nano-drug-delivery-system-ihn-dds-of-antiretroviral-drug-for-simultaneous-targeting-to-multiple-viral-reservoirs-an-in-vivo-proof-of-concept
#19
Anil B Jindal, Sagar S Bachhav, Padma V Devarajan
We report In situ hybrid nano drug delivery system (IHN-DDS) of nevirapine (NVP) for simultaneous targeting to multiple viral reservoirs. The IHN-DDS system was comprised of a preconcentrate containing NVP, lipid, and a surfactant which when diluted with water resulted in the formation of nanoparticles of size range varied from 70 to 1100nm. Transmission electron microscopy and small angle neutron scattering studies of pellet and supernatant obtained after centrifugation of the IHN-DDS revealed spherical shaped nanoparticles and assembled structures, respectively...
February 13, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28229522/fused-silica-capillaries-with-two-segments-of-different-internal-diameters-and-inner-surface-roughnesses-prepared-by-etching-with-supercritical-water-and-used-for-volume-coupling-electrophoresis
#20
Marie Horká, Pavel Karásek, Michal Roth, Karel Šlais
In the present work, single-piece fused silica capillaries with two different internal diameter segments featuring different inner surface roughness were prepared by new etching technology with supercritical water and used for volume coupling electrophoresis. The concept of separation and on-line pre-concentration of analytes in high conductivity matrix is based on the on-line large-volume sample pre-concentration by the combination of transient isotachophoretic stacking and sweeping of charged proteins in micellar electrokinetic chromatography using non-ionogenic surfactant...
February 22, 2017: Electrophoresis
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