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https://www.readbyqxmd.com/read/28822290/freeze-dryable-lipid-vesicles-with-size-tunability-and-high-encapsulation-efficiency-prepared-by-the-multiple-emulsification-solvent-evaporation-method
#1
Akihiko Suzuki, Takashi Kuroiwa, Kaname Horikoshi, Akihiko Kanazawa, Sosaku Ichikawa
We investigated the extent of potential applicability of our recently developed method for preparing lipid vesicles [T. Kuroiwa et al., J. Am. Oil Chem. Soc., 93 (2016) 421], designated as the multiple emulsification-solvent evaporation method, with the intention of controlling the vesicle diameter and achieving high entrapment efficiency for water-soluble compounds. Using this method, the diameter of lipid vesicles could be varied by selecting the methods for preparing the primary water-in-oil emulsion, which contained water droplets as templates for the internal water phases of lipid vesicles...
August 1, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28822289/assessing-differences-between-ostwald-ripening-and-coalescence-by-rheology-laser-diffraction-and-multiple-light-scattering
#2
J Santos, N Calero, L A Trujillo-Cayado, M C Garcia, J Muñoz
This contribution deals with the study of the influence of surfactant ratio, namely triblock copolymer (Pluronic PE9400) to polyoxyethylene glycerol fatty acid ester (Levenol C201), on the stability of emulsions formulated with a mixture of two biosolvents (N,N Dimethyl Decanamide and D-limonene), which find applications as carriers of agrochemicals. Emulsions containing Pluronic, regardless of the concentration studied, underwent Ostwald ripening while coalescence controlled the destabilization process of emulsions containing Levenol C201 as the only emulsifier...
August 14, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28821035/barley-and-yeast-%C3%AE-glucans-as-new-emulsifier-agents-for-the-development-of-aqueous-natural-antifungal-formulations
#3
Marta Salgado, Soraya Rodríguez-Rojo, María José Cocero
Barley and yeast β-glucans were selected, together with lecithin, to encapsulate resveratrol by emulsification-evaporation method to develop new and safer antifungal formulations. Different emulsification techniques were used: high-shear, high pressure and high pressure and temperature emulsification. Morphology, crystallinity, encapsulation efficiency and in vitro antifungal activity against Botrytis cinerea of the different formulations were evaluated. No significant differences between each emulsification procedure in particle size (below 90nm) and in encapsulation efficiency (70-100%) were observed; only barley β-glucan emulsions showed lower efficiency due to the formation of a gel that retained most of the active compound...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28819128/porous-polystyrene-monoliths-and-microparticles-prepared-from-core-cross-linked-star-ccs-polymers-stabilized-emulsions
#4
Qijing Chen, Ting Shi, Fei Han, Zihan Li, Chao Lin, Peng Zhao
A hydrophobic CCS polymer of poly(benzyl methacrylate) (PBzMA) was prepared in toluene by reversible addition-fragmentation chain transfer (RAFT)-mediated dispersion polymerization. The CCS polymer, with poly(benzyl methacrylate) as the arm and crosslinked N, N'-bis(acryloyl)cystamine (BAC) as the core, was confirmed by characterization with gel permeation chromatography (GPC) and nuclear magnetic resonance (NMR) spectroscopy. Three kinds of oils (toluene, anisole and styrene) were chosen to study the emulsification properties of PBzMA CCS polymer...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28818729/characterization-of-citrus-pectin-films-integrated-with-clove-bud-essential-oil-physical-thermal-barrier-antioxidant-and-antibacterial-properties
#5
Tanzeela Nisar, Zi-Chao Wang, Xi Yang, You Tian, Muneeb Iqbal, Yurong Guo
The increasing demand for bio-based materials to be used in food packaging has stimulated the development of novel, environmentally-friendly edible films. Antimicrobial films were developed by incorporating different levels of clove bud essential oil (0.5%, 1.0%, and 1.5%) into the citrus pectin in order to modify the functional properties of the films. Fourier-transform infrared spectroscopy (FTIR), differential scanning calorimetry analysis (DSC) and X-ray diffraction (XRD) were performed, together with the determination of physical, optical, mechanical, antioxidant and antimicrobial properties of pectin emulsified films...
August 14, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28816350/characteristics-and-functionality-of-appetite-reducing-thylakoid-powders-produced-by-three-different-drying-processes
#6
Karolina Östbring, Ingegerd Sjöholm, Henrietta Sörenson, Andrej Ekholm, Charlotte Erlanson-Albertsson, Marilyn Rayner
BACKGROUND: Thylakoids, a chloroplast membrane extracted from green leaves, is a promising functional ingredient with appetite reducing properties via their lipase-inhibiting effect. Thylakoids in powder form has been evaluated in animal and human models but no comprehensive study has been conducted on powder characteristics. The aim was to investigate the effects of different isolation methods and drying techniques (drum-drying, spray-drying, freeze-drying) on thylakoids' physicochemical and functional properties...
August 17, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28812765/rational-design-of-polymeric-core-shell-ratiometric-oxygen-sensing-nanostructures
#7
Aisling Byrne, Jaco Jacobs, Christopher S Burke, Aaron Martin, Andreas Heise, Tia E Keyes
A new approach for the fabrication of luminescent ratiometric sensing nanosensors is described using core-shell nanoparticles in which the probe and reference are spatially separated into the shell and core of the nanostructure respectively. The isolation of the reference in the core of the particle ensures a stable emission reference signal unaffected by the external environment. The core shell structure was prepared by engineering structurally well-defined Ru-conjugated block copolymers which acted as emulsifiers in the miniemulsion polymerisation of BODIPY loaded styrene nanoparticles...
August 16, 2017: Analyst
https://www.readbyqxmd.com/read/28802847/structural-antioxidant-and-antimicrobial-activities-of-polysaccharides-extracted-from-olive-leaves
#8
Ibtihel Khemakhem, Ola Abdelhedi, Ines Trigui, Mohamed Ali Ayadi, Mohamed Bouaziz
In the present study, hot-water extraction procedure was used to recover polysaccharides from olive leaves. Primary structural characteristics were determined by nuclear magnetic resonance spectroscopy ((1)H NMR and (13)C NMR), Fourier Transform-Infrared spectroscopy (FT-IR) and X-ray diffractometry analysis. Emulsifying capacity, Zeta (ζ) potential and differential scanning calorimetric (DSC) of olive leaf polysaccharides (OLP) were investigated. Antioxidant and antimicrobial activities were then examined...
August 9, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28802794/a-novel-and-organic-solvent-free-preparation-of-solid-lipid-nanoparticles-using-natural-biopolymers-as-emulsifier-and-stabilizer
#9
Jingyi Xue, Taoran Wang, Qiaobin Hu, Mingyong Zhou, Yangchao Luo
In this work, a new and novel organic solvent-free and synthetic surfactant-free method was reported to fabricate stable solid lipid nanoparticles (SLNs) from stearic acid, sodium caseinate (NaCas) and pectin, as well as water. Melted stearic acid was directly emulsified into an aqueous phase containing NaCas and pectin, followed by pH adjustment and thermal treatment to induce the formation of a compact and dense polymeric coating which stabilized SLNs. The preparation procedures and formulations were comprehensively optimized...
August 9, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28800465/oil-based-cyclo-oligosaccharide-nanodevices-for-drug-encapsulation
#10
Jennifer Noro, Ana Loureiro, Filipa Gonçalves, Nuno G Azoia, Seunho Jung, Carla Silva, Artur Cavaco-Paulo
New encapsulation nanodevices were synthesized by emulsification of cyclo-oligosaccharides fully substituted by hydrophobic palmitic chains. These highly hydrophobic compounds, acquire oily-like behaviour at moderate temperatures (∼50°C) and when submitted to ultrasound (US) can undergo emulsification. The improved emulsifying properties of modified cyclo-oligosaccharides are suitable to produce small and narrow sized nanoemulsions with ability to encapsulate amphiphilic molecules. Both encapsulation and delivery of a therapeutic drug, methotrexate (MTX), with amphiphilic character was assessed...
July 25, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28799853/effect-of-combination-of-high-intensity-ultrasound-treatment-and-dextran-glycosylation-on-structural-and-interfacial-properties-of-buckwheat-protein-isolates
#11
Feng Xue, Zhoushan Wu, Jinrong Tong, Jialun Zheng, Chen Li
This study investigated the effects of high-intensity ultrasound and glycosylation on the structural and interfacial properties of the Maillard reaction conjugates of buckwheat protein isolate (BPI). The covalent attachment of dextran to BPI was confirmed by examination of the Fourier-transform infrared spectra. Emulsifying properties of the conjugates obtained by ultrasound treatment were improved as compared to those obtained by classical heating. Structural feature analyses suggested that conjugates obtained by ultrasound treatment had less α-helix and more random coil, higher surface hydrophobicity and less compact tertiary structure as compared to those obtained by classical heating...
August 11, 2017: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/28799359/does-the-emulsification-procedure-influence-freezing-and-thawing-of-aqueous-droplets
#12
Astrid Hauptmann, Karl F Handle, Philipp Baloh, Hinrich Grothe, Thomas Loerting
Here we investigate the freezing and thawing properties of aqueous solutions in oil emulsions, with a particular focus on investigating the influence of the oil and surfactant and the stirring time of the emulsion. Specifically, we employ optical cryomicroscopy in combination with differential scanning calorimetry to study the phase behavior of emulsified 25 wt. % ammonium sulfate droplets in the temperature range down to 93 K. We conclude that the nucleation temperature does not vary with oil-surfactant combination, that is, homogeneous nucleation is probed...
December 7, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28799351/nmr-spectroscopy-study-of-local-correlations-in-water
#13
Francesco Mallamace, Carmelo Corsaro, Domenico Mallamace, Sebastiano Vasi, H Eugene Stanley
Using nuclear magnetic resonance we study the dynamics of the hydrogen bond (HB) sub-domains in bulk and emulsified water across a wide temperature range that includes the supercooled regime. We measure the proton spin-lattice T1 and spin-spin T2 relaxation times to understand the hydrophilic interactions that determine the properties of water. We use (i) the Bloembergen, Purcell, and Pound approach that focuses on a single characteristic correlation time τc, and (ii) the Powles and Hubbard approach that measures the proton rotational time τθ...
December 7, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28798377/peo-based-brush-type-amphiphilic-macro-raft-agents-and-their-assembled-polyhipe-monolithic-structures-for-applications-in-separation-science
#14
Aminreza Khodabandeh, R Dario Arrua, Fotouh R Mansour, Stuart C Thickett, Emily F Hilder
Polymerized High Internal Phase Emulsions (PolyHIPEs) were prepared using emulsion-templating, stabilized by an amphiphilic diblock copolymer prepared by reversible addition fragmentation chain transfer (RAFT) polymerization. The diblock copolymer consisted of a hydrophilic poly(ethylene glycol) methyl ether acrylate (PEO MA, average Mn 480) segment and a hydrophobic styrene segment, with a trithiocarbonate end-group. These diblock copolymers were the sole emulsifiers used in stabilizing "inverse" (oil-in-water) high internal phase emulsion templates, which upon polymerization resulted in a polyHIPE exhibiting a highly interconnected monolithic structure...
August 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28796363/physiochemical-properties-and-probiotic-survivability-of-symbiotic-corn-based-yogurt-like-product
#15
Cuina Wang, Huajie Zheng, Tingting Liu, Dawei Wang, Mingruo Guo
Corn is a major grain produced in northern China. Corn-based functional food products are very limited. In this study, a symbiotic corn-based yogurt-like product was developed. Corn milk was prepared through grinding, extrusion and milling, and hydration processes. Corn extrudate was prepared under the optimized conditions of corn flour particle size <180 μm, moisture content of 15% and extrusion temperature at 130 °C. The corn milk was prepared from 8% corn extrudate suspension and then milled twice with 0...
August 10, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28794309/enteral-formula-containing-egg-yolk-lecithin-improves-diarrhea
#16
Tetsuro Akashi, Ayano Muto, Yayoi Takahashi, Hiroshi Nishiyama
Diarrhea often occurs during enteral nutrition. Recently, several reports showed that diarrhea improves by adding egg yolk lecithin, an emulsifier, in an enteral formula. Therefore, we evaluated if this combination could improve diarrhea outcomes. We retrospectively investigated the inhibitory effects on watery stools by replacing a polymeric fomula with that containing egg yolk lecithin. Then, we investigated the emulsion stability in vitro. Next, we examined the lipid absorption using different emulsifiers among bile duct-ligated rats and assessed whether egg yolk lecithin, medium-chain triglyceride, and dietary fiber can improve diarrhea outcomes in a rat model of short bowel syndrome...
August 8, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28782582/development-and-in-vitro-characterization-of-a-papain-loaded-mucolytic-self-emulsifying-drug-delivery-system-sedds
#17
Christina Leichner, Claudia Menzel, Flavia Laffleur, Andreas Bernkop-Schnürch
The aim of the study was to create a self-emulsifying drug delivery system (SEDDS) with mucolytic properties based on incorporated papain for improved mucus permeation. In order to increase the lipophilicity of the enzyme and to dissolve it in SEDDS, hydrophobic ion pairing with sodium deoxycholate in a molar ratio of 20:1 (surfactant: enzyme) was performed. The yield of precipitated papain was 86.8±2.7% and the ion pair was loaded into the formulations to 1% (m/m). Suitable formulations were chosen according to their properties to dissolve the ion pair and characterized regarding droplet size and polydispersity index...
August 3, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28780460/nanoscale-trifunctional-bovine-hemoglobin-for-fabricating-molecularly-imprinted-polydopamine-via-pickering-emulsions-hydrogels-polymerization
#18
Yanhua Sun, Shian Zhong
In this work, a novel strategy was developed for the selective recognition of protein based on oil-in-water Pickering emulsions-hydrogels polymerization and interfacial imprinting method. For the first time, nanoscale trifunctional bovine hemoglobin (BHb) played three roles simultaneously during the process, including emulsifier, template protein and sacrificial material for further exposing recognition sites. Prior to acting as stabilizers, bovine hemoglobin colloidal particles (BCPs) were firstly prepared by acidification and heat denaturation...
July 29, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28780331/preparation-of-lipid-nanoparticles-with-high-loading-capacity-and-exceptional-gastrointestinal-stability-for-potential-oral-delivery-applications
#19
Taoran Wang, Jingyi Xue, Qiaobin Hu, Mingyong Zhou, Yangchao Luo
Exploitation of lipid nanoparticles for oral delivery of nutrients and drugs is limited by their poor stability under gastrointestinal tract and low loading capacity, unless a high concentration of synthetic surfactants is formulated. The main objective of present study is to design a series of new formulations for solid lipid nanoparticles (SLN) and nanostructured lipid carriers (NLC) that are suitable for potential oral delivery applications, using natural biopolymers, i.e. sodium caseinate (NaCas) as emulsifier and pectin as coating, with minimal addition of a synthetic surfactant, Tween 80...
July 26, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28775392/optimisation-of-octinyl-succinic-anhydride-starch-stablised-w1-o-w2-emulsions-for-oral-destablisation-of-encapsulated-salt-and-enhanced-saltiness
#20
Natalie Chiu, Amparo Tarrega, Christopher Parmenter, Louise Hewson, Bettina Wolf, Ian D Fisk
Sodium (salt) was encapsulated within the inner water phase of w1/o/w2 food emulsions externally stabilised by starch particles with the ultimate aim of enhancing saltiness perception. The physical properties of the starch particles were modified by octenyl succinic anhydride (OSA) treatment (0-3%) to vary the degree of hydrophobicity of the emulsifying starch. During oral processing native salivary amylase hydrolysed the starch and destabilised the o/w emulsion releasing the inner w/o phase and subsequently sodium into the oral cavity, resulting in a salty taste...
August 2017: Food Hydrocolloids
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