The Experts below are selected from a list of 12210 Experts worldwide ranked by ideXlab platform
Henri Cramail - One of the best experts on this subject based on the ideXlab platform.
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Organogels from trehalose difatty esters amphiphiles
Soft Matter, 2019Co-Authors: Geoffrey Hibert, Martin Fauquignon, Jean-françois Le Meins, Didier Pintori, Etienne Grau, Sébastien Lecommandoux, Henri CramailAbstract:Saccharide diesters have been recently shown to be excellent gelators of vegetable oils. In this paper, different fatty acid trehalose diesters were synthesized by a selective enzymatic transesterification performed only on the primary hydroxyl group of the trehalose. The resulting trehalose diesters demonstrated their ability to self-assemble in a large variety of edible vegetable oils with a minimum Gelation Concentration of 0.25 wt%/v. Microscopic analysis and X-ray scattering studies indicate that the gels are obtained by the self-assembly of trehalose diesters in crystalline fibers constituting the tridimensional network. The rheological study revealed that the properties of the gels depend on the kind of fatty acid grafted on the trehalose but are also influenced by the vegetable oil composition.
Magdalene Omoneka Abu - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of blends of wheat (Triticum aestivum) flour and African walnut (Tetracarpidium conophorum) flour in biscuit production
Croatian journal of food science and technology, 2019Co-Authors: A. A. Olapade, Magdalene Omoneka AbuAbstract:The use of underutilized crops has been the focus of recent research in developing countries like Nigeria because of inadequacy of protein supply in diets. In attempt to improve the use of underutilized crops, biscuit samples were produced from flour blends containing different combinations of African walnut flour and wheat flour. The 100% wheat flour served as control. The African walnut and wheat flours were mixed in ratios 10:90, 20:80, 30:70, 40:60 and 50:50%. The proximate composition, functional and pasting properties of the blends as well as physical and sensory properties of the biscuits were determined The results showed the increase in the level of protein, ash, fat and moisture content of the blends with increasing levels of walnut flour. The bulk density, water absorption and swelling power of the blends reduced, while oil absorption capacity, emulsion capacity and least Gelation Concentration increased with increasing levels of walnut flour. Variations exist in the pasting properties of the blends. The diameter of the biscuits increased with increase in the level of walnut flour, hence the spread ratio increased from 3.52 to 6.56. There were significant differences between the biscuit samples in terms of aroma, taste and appearance. However, biscuit sample with inclusion level of 30% walnut flour compared favourably with the control in terms of sensorial quality
Geoffrey Hibert - One of the best experts on this subject based on the ideXlab platform.
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Organogels from trehalose difatty esters amphiphiles
Soft Matter, 2019Co-Authors: Geoffrey Hibert, Martin Fauquignon, Jean-françois Le Meins, Didier Pintori, Etienne Grau, Sébastien Lecommandoux, Henri CramailAbstract:Saccharide diesters have been recently shown to be excellent gelators of vegetable oils. In this paper, different fatty acid trehalose diesters were synthesized by a selective enzymatic transesterification performed only on the primary hydroxyl group of the trehalose. The resulting trehalose diesters demonstrated their ability to self-assemble in a large variety of edible vegetable oils with a minimum Gelation Concentration of 0.25 wt%/v. Microscopic analysis and X-ray scattering studies indicate that the gels are obtained by the self-assembly of trehalose diesters in crystalline fibers constituting the tridimensional network. The rheological study revealed that the properties of the gels depend on the kind of fatty acid grafted on the trehalose but are also influenced by the vegetable oil composition.
Hongye Ye - One of the best experts on this subject based on the ideXlab platform.
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Development of Lignin Supramolecular Hydrogels with Mechanically Responsive and Self-Healing Properties
ACS Sustainable Chemistry & Engineering, 2015Co-Authors: Sing Shy Liow, Anis Abdul Karim, Hongye Ye, Kai LiAbstract:The development of functional polymers from renewable lignin is attractive due to the depletion of fossil fuel and increasing environmental usage. A series of poly(ethylene glycol) methyl ether methacrylate (PEGMA)-grafted lignin hyperbranched copolymers were prepared by atom transfer radical polymerization (ATRP). The chemical structures, molecular characteristic and thermal properties of these copolymers were evaluated and such copolymers were prepared in a range of molecular weights from 38.7 to 65.0 kDa by adjusting the PEGMA-to-lignin weight ratio. As a result from their hyperbranch architecture, their aqueous solutions were found to form supramolecular hydrogels with a very low critical Gelation Concentration of 1 wt % copolymers, in the presence of α-cyclodextrin (α-CD). The rheological properties of the supramolecular assemblies were investigated and these hydrogel systems showed tunable mechanical response and excellent self-healing capability. Combined with good biocompatibility, these new types...
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a thixotropic polyglycerol sebacate based supramolecular hydrogel showing ucst behavior
RSC Advances, 2015Co-Authors: Hongye YeAbstract:Polyglycerol sebacate (PGS) is a relatively new biodegradable and elastomeric material that exhibits superior biocompatibility, a modulus that is comparable to human soft tissue, and linear biodegradation. However, the high hydrophobicity, low water uptake percentage and extreme synthesis conditions of PGS pose as a hindrance to its use in cellular biology, biomedical and other applications. We were able to modify PGS using atom transfer radical polymerization (ATRP) by synthesizing a PGS macroinitiator, allowing us to improve PGS's properties or introduce new properties to PGS. This macroinitiator would enable the building of a robust platform of PGS-based copolymers with monomers in the methacrylates, styrenes and methacrylamide families. We demonstrated the feasibility of this macroinitiator by using PEGMEMA as the monomer to synthesize PGS–PEGMEMA and created a PGS–PEGMEMA/αCD supramolecular hydrogel system. This hydrogel exhibited a tunable, low UCST of less than 90 °C, low minimum Gelation Concentration of 5.2%, rapid Gelation and rapid self-healing ability with relatively high modulus (∼100 kPa) that is comparable to that of human soft tissue. This hydrogel system is injectable yet strong enough to provide support – features, making it a very suitable candidate as a vehicle for injectable sustained-release drug delivery, cell delivery, tissue engineering scaffold as well as for cosmetics and skincare applications.
Zhimou Yang - One of the best experts on this subject based on the ideXlab platform.
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Enzyme-triggered self-assembly of a small molecule: a supramolecular hydrogel with leaf-like structures and an ultra-low minimum Gelation Concentration
Nanotechnology, 2010Co-Authors: Huaimin Wang, Chunhua Ren, Zhijian Song, Ling Wang, Xuemei Chen, Zhimou YangAbstract:We report on the use of a phosphatase to assist the formation of leaf-like structures and a supramolecular hydrogel with an ultra-low minimum Gelation Concentration. The compound can gel water at a minimum Gelation Concentration of 0.01 wt%, which is the lowest Gelation Concentration reported up to now. The images obtained by transmission electron microscopy (TEM) reveal the existence of leaf-like structures serving as the matrix of the hydrogels. The stability of the hydrogels was studied and emission spectra were used to get information about the molecular packing in the leaf-like structures. Since lowering the Concentration of the gelator decreases the toxicity of the resulting hydrogels, ultra-low Concentration gels have potential uses as biocompatible biomaterials for, e.g., cell cultures, tissue engineering, and drug delivery.