Biopolymer-Based Structuring of Liquid Oil into Soft Solids and Oleogels Using Water-Continuous Emulsions as Templates

详细信息    查看全文

• 作者：Ashok R. Patel ; Pravin S. Rajarethinem ; Nick Cludts ; Benny Lewille ; Winnok H. De Vos ; Ans Lesaffer ; Koen Dewettinck
• 刊名：Langmuir
• 出版年：2015
• 出版时间：February 24, 2015
• 年：2015
• 卷：31
• 期：7
• 页码：2065-2073
• 全文大小：636K
• ISSN：1520-5827

文摘

Physical trapping of a hydrophobic liquid oil in a matrix of water-soluble biopolymers was achieved using a facile two-step process by first formulating a surfactant-free oil-in-water emulsion stabilized by biopolymers (a protein and a polysaccharide) followed by complete removal of the water phase (by either high- or low-temperature drying of the emulsion) resulting in structured solid systems containing a high concentration of liquid oil (above 97 wt %). The microstructure of these systems was revealed by confocal and cryo-scanning electron microscopy, and the effect of biopolymer concentrations on the consistency of emulsions as well as the dried product was evaluated using a combination of small-amplitude oscillatory shear rheometry and large deformation fracture studies. The oleogel prepared by shearing the dried product showed a high gel strength as well as a certain degree of thixotropic recovery even at high temperatures. Moreover, the reversibility of the process was demonstrated by shearing the dried product in the presence of water to obtain reconstituted emulsions with rheological properties comparable to those of the fresh emulsion.