This work presents equilibrium and dynamic aspects for the adsorption at the oil-water interface of pea (Pisum sativum L.) protein isolate (PPI). Dynamic interfacial tension, I3, and surface viscoelasticity modulus, Iµ, were determined using pendant-drop method. Adsorption kinetics studies revealed that pea proteins adsorb faster at pH 7.0 than at acidic pH (pH 2.4). On the other hand, the measured Iµ is lower at pH 7.0. This is probably due to fast adsorption, leading to the formation of inhomogeneous film structures. In fact, compared with pHs above the isoelectric point (pI"‰~"‰4.3), acidic conditions slow down the adsorption, but the modulus is increased. Pea-protein-stabilized emulsions are more stable to creaming at acidic pH and their particle-size distributions are more homogeneous in these conditions. Effect of pH on interfacial properties and on properties of oil-in-water emulsions stabilized by PPI was interpreted in terms of pea protein solubility, globulin dissociation, and oil-droplet surface electrostatic charge. We propose that at acidic conditions, adsorbed dissociated globulins form stronger and denser viscoelastic networks when adsorbed at oil-water interface. Consequently, the pH-dependence of pea-globulin-stabilized emulsions properties could be of great interest to tune barrier properties of oil/water interfacial membranes for several applications such as encapsulation and controlled release of lipophilic bioactive components within the food, medical, and pharmaceutical industries.
submitted by qualitybmarks 2 years and 5 months ago
Wet extraction of protein from defatted chickpea (variety Thiva (T), Greece) flour, at alkaline or slightly acidic pH, followed by isoelectric precipitation (pI) or ultrafiltration (UF) to recover the protein, was employed to obtain a number of chickpea protein isolates, enriched either in protei...
Oil-in-water emulsions can be considered as an important delivery system for lipophilic food molecules. In this study, pea protein isolate (PPI) was studied for its emulsifying capacity at various pH values and pH 7 was selected to prepare emulsions for the production of dry microcapsules. Emulsi...
The citric acid treated carbon supported Ru85Se15catalysts are synthesized by microwave assisted polyol method at the optimal solution pH = 7. The catalyst coated membrane method with ultrasonic-spray technique is employed to prepare electrodes without hot press step. The cell performances with...
Recent studies have reported collagen cross-linking after exposure to riboflavin followed by ultraviolet-A (UVA) exposure. This study is the first to investigate the effect of a riboflavin-containing primer on adhesive interface stability and dentinal matrix metalloproteinase activity. Human dent...
The interface in multi-walled carbon nanotube (MWCNT)–metal matrix composites significantly effects the interfacial thermal diffusion characteristics vary due to the presence of an interphase. The thermal conductivities of MWCNT–copper (Cu) composites with and without amorphous impurity layer...
The antioxidant, angiotensin-I-converting enzyme (ACE) inhibitory activities and functional properties of egg white protein hydrolysate (EWPH) prepared by papain under different concentrations and pH were investigated. The antioxidant activity of EWPH increased with increasing concentration and d...
Interfacial and emulsifying properties of rice protein concentrate (RPC) have been studied in order to evaluate its potential application to stabilize O-W emulsions. The interfacial behaviour of adsorbed proteins films constituted with RPC has been studied at the air-water and oil-water interface...
The aim of this study is to identify the chemical reactions/interactions that contribute to the interfacial strength development between a polyethylene-co-methacrylic acid (EMAA) healing agent and a mendable epoxy resin. Interfacial strength development during curing and healing are critical to t...
Many biological polyelectrolytes are capable of undergoing a fluid-fluid phase separation known as complex coacervation. Coacervates were prepared using hyaluronic acid (HA) and a recombinant fusion protein consisting of mussel adhesive motifs and the RGD peptide (fp-151-RGD). The low interfacial...
The surface of the layered III-VI chalcogenide semiconductor GaSeTe was treated with (NH4)2S at 60°C to modify the surface chemistry and determine the effect on transport properties. X-ray photoelectron spectroscopy and room temperature photoluminescence were used to examine the surface reacti...
