Natural biopolymer scaffolds and conductive nanomaterials have been widely used in cardiac tissue engineering; however, there are still challenges the scaffold fabrication, which include enhancing nutrient delivery, biocompatibility properties that favor growth, maturation functionality of generated for therapeutic application. In present work, different prepared with sodium alginate chitosan (alginate/chitosan) were fabricated without addition metal nanoparticles how their fabrication...

Due to its chemical properties, glyphosate [N-(phosphonomethyl)glycine] is one of the most commonly used agricultural herbicides globally. risks associated with human exposure and potential harmfulness, need develop specific, accurate, online, sensitive methods imperative. In accordance this, present review focused on recent advances in developing nanomaterial-based sensors for detection. Reported data from literature concerning detection different matrices using analytical (mostly...

The structural simplicity of native cyclodextrins (CDs) contrasts with their complex behavior in the bulk aqueous solutions, mainly when they are combined other cosolutes. Many scientific and industrial applications based on these molecules supported only by empirical information. lack fundamental knowledge, which would allow one to rationally optimize many applications, is notable at solution/air interface. Basic information phenomena such as spontaneous adsorption CDs or structure CD...

Abstract In recent years, the continuous and accumulative discharge of toxic contaminating compounds to environment makes necessary propose precise quick methods for their detection quantitation. Especially when one considers that environmental impact some these emerging contaminants has not been clearly determined. Enzyme-based biosensors are an interesting alternative inspecting different pollutants present in a quick, efficient, automatized, economic way. Oxidative enzymes such as...

The spontaneous aggregation of α-cyclodextrin (α-CD) molecules in the bulk aqueous solution and interactions resulting aggregates at liquid/air interface have been studied 283 K using a battery techniques: transmission electron microscopy, dynamic light scattering, surface tensiometry, Brewster angle neutron reflectometry, ellipsometry. We show that α-CD spontaneously form grow size with time. These adsorb to their determining adsorption rate. material reaches coalesces laterally...

The adsorption and formation of DNA cationic surfactant complexes at the silica−aqueous interface have been studied by ellipsometry. interaction between DNA−surfactant mica−aqueous has determined interferometric surface force apparatus. Adsorption was as expected not observed on negatively charged hydrophilic surfaces for when DNA−cationic were charged. However, there is an excess surfactant, just below point phase separation. process requires hours to reach steady state. adsorbed layer...

The mechanical properties of lipid monolayers and their responses to shear compression stresses play an important role in processes such as breathing eye blinking. We studied the Langmuir a model mixture, composed unsaturated lipid, 1-palmitoyl-2-oleoyl-sn-glycero-phosphoethanolamine (POPE), saturated 1,2-dipalmitoyl-sn-glycero-phosphocholine (DPPC). performed isothermal compressions sinusoidal deformations these mixed monolayers. Also, different phases were observed with Brewster angle...

This work showcases the remarkable viscoelasticity of films consisting α-cyclodextrin (α-CD) and anionic surfactants (S) at water/air interface, magnitude which has not been observed in similar systems. The employed are sodium salts a homologous series n-alkylsulfates (n = 8-14) dodecylsulfonate. Our hypothesis was that very high can be systematically related to bulk interfacial properties system. Through resolution distribution species using isothermal titration calorimetry, dilatational...

Communication between cells located in different parts of an organism is often mediated by membrane-enveloped nanoparticles, such as extracellular vesicles (EVs). EV binding and cell uptake mechanisms depend on the heterogeneous composition membrane. From a colloidal perspective, membrane interacts with other biological interfaces via both specific non-specific interactions, where latter include long-ranged electrostatic van der Waals forces, short-ranged repulsive "steric-hydration" forces....

The formation of polymer films obtained from latexes and their structural features have been investigated with the aid a Monte Carlo simulation modelling atomic force microscopy. effects particle size polydispersity solvent drying rate on film structure, permeability roughness studied. It has shown that slow permits relatively low porosity smooth surfaces. Polydispersity in leads to weakening layering thereby reduction barrier properties. Theoretical calculations indicate existence local...

10,16-dihydroxyhexadecanoic acid, main monomer of the tomato cuticle obtained from agro-residual wastes, was polymerized using (choline chloride.2ZnCl2) ionic liquid as catalyst at three different temperatures (80, 90 and 100 °C). The resulting polyesters under these conditions were insoluble in most organic solvents showed physicochemical properties. While 80 °C polymers powder, higher temperature they found viscous consistency. According with CP MAS 13C NMR FTIR-ATR analysis, a linear...

Plasma polymerized pyrrole/iodine (PPPy/I) microparticles and bovine serum albumin (BSA) protein have shown interesting results in experimental models for the treatment of traumatic spinal cord injury. By studying interaction between BSA PPPy/I by a quartz crystal microbalance (QCM) docking, we obtained important to elucidate possible cellular interactions promote use these polymers as biomaterials. These measurements were also used characterize adsorption process using an equilibrium...

International environmental regulations have created the need for sensitive, accurate, and reproducible analytical tools to measure ultralow sulfur concentrations in fuels, such as diesel gasoline. In this work, a methodology desulfurized diesels (<0.01 ppb) is presented. The spectroscopic technique used here overcomes lack of selectivity or signal overlapping that present other techniques nowadays. consists first an enzymatic partial oxidation compounds diesel, followed by selective...

Herein we studied the processes at liquid aqueous interface pH 7 and 8.5 during Thermomyces lanuginosus lipase-catalyzed hydrolysis of nanosized tri-, di- mono-olein films deposited on a planar substrate. By employing combination ellipsometry, QCM-D ATR-FTIR, were able to reveal physical properties thin high time resolution throughout initial hydration subsequent digestion, as well main chemical species present before after lipolysis. The ATR-FTIR results showed that degree digestion...

Interactions between amphiphilic α-helical human apolipoprotein CI (APO CI) adsorbed on hydrophilic and hydrophobic surfaces were studied using an interferometric surface force apparatus in effort to understand the conformation binding activity of this protein. We used mica as substrate polymerized octadecyltriethoxysilane (OTE)-covered substrate. The OTE monolayer Langmuir−Blodgett film Brewster angle microscopy atomic microscopy, respectively. found that interaction forces layers APO are...

The forces between hydrophobic surfaces with physisorbed DNA are markedly and irreversibly altered by exposure to DNA/cetyltrimethylammonium bromide (CTAB) mixtures. In this colloidal probe atomic force microscopy study of the interactions a polystyrene particle an octadecyltrimethylethoxysilane-modified mica surface in sodium solutions, we measure distinct changes depending on existence state adsorbed layer or CTAB−DNA complexes. For bare surfaces, monotonically attractive approach curve...

To provide better understanding of how a protein secondary structure affects protein−protein and protein−surface interactions, forces between amphiphilic α-helical proteins (human apolipoprotein AII) adsorbed on hydrophilic surface (mica) were measured using an interferometric force apparatus (SFA). Forces surfaces with layers this are mainly composed electrostatic double layer at large distances steric repulsive small distances. We suggest that the amphiphilicity α-helix facilitates...

Herein we present a green procedure to obtain cellulose (Cel) polymers with different physicochemical properties at high purity, and underline its two major aspects: sustainability efficiency. In the first place, regarding sustainability, source of Cel was residues from agar industries, which are based on red seaweed hence free lignin, thus facilitating extraction Cel. aspect efficiency, continuous extraction/reaction system used pure these residues. The device in this study normally works...

10,16-dihydroxyhexadecanoic acid obtained from agroresidual tomato waste, was oxidized to produce 7-oxohexadecanedioic in good yield (&gt;70%) and purified without oxidation side products one step. Polycondensation with 1,8-octanediol, yielded the polyester (poly(ω-carboxyl PA-co-OD)) Mw = 2155.15 Mn 1637.27. The best enzymatic reaction conditions get were using lipase CAL-B (%-by-wt relative monomer) toluene as a solvent for 1 h at 60 °C. poly(ω-carboxyl PA-co-OD) characterized by 1H-...