title: Effects of ultrasound treatment on lipid self-association and properties of methylcellulose/stearic acid blending films.
abstract: The effects of ultrasound treatment (UT) on the properties of methylcellulose (MC)/stearic acid (SA) blending films were studied. Film-forming emulsions were prepared with different UT conditions and characterized with respect to viscosity. The lipid aggregation and distribution in the blending dispersions were studied by the micrographs of Transmission Electron Microscopy (TEM). The micrographs of both surface and cross-section of the films were observed by scanning electron microscope (SEM) and the tensile strength (TS), elongation at break (E), water vapor permeability (WVP) and contact angles of the resulting films were determined as well. The intensification of the UT condition led to a decrease of viscosity of the MC-SA blending emulsions, a more homogeneous lipid distribution and a denser internal microstructure of the resulting films. UT exposure affected the mechanical, moisture barrier and surface hydrophobic properties. The optimal values of both TS and E was obtained from the sample treated for 10min and 180W power, while the sample treated for 10min and 270W presented the lowest value of WVP. However, an excessive exposure of UT led to a decrease of the mechanical and moisture barrier performance. By observing and analyzing the SEM graphs and the contact angles of the film surfaces, it was found that UT within the appropriate bounds had a notably positive effect on improving the surface hydrophobic property of the MC-SA blending films.
authors.affiliation: Department of Chemistry, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China.
authors.forename: Tian
authors.initials: T
authors.lastname: Zhong
authors.affiliation: Department of Chemistry, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China.
authors.forename: Ran
authors.initials: R
authors.lastname: Huang
authors.affiliation: School of Biological and Agricultural Engineering, Jilin University, No. 5988 Renmin Street, Changchun 130025, Jilin, PR China.
authors.forename: Siyao
authors.initials: S
authors.lastname: Sui
authors.affiliation: Department of Food Science & Technology, School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China.
authors.forename: Zixuan
authors.initials: Z
authors.lastname: Lian
authors.affiliation: USDA, ARS, Horticultural Research Laboratory, 2001 S. Rock Rd, Ft. Pierce, FL 34945, USA.
authors.forename: Xiuxiu
authors.initials: X
authors.lastname: Sun
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, National Engineering Research Center of Facilities Agriculture, Tongji University, Shanghai 200092, PR China; School of Pharmacy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China. Electronic address: wanajun@tongji.edu.cn.
authors.forename: Ajun
authors.initials: A
authors.lastname: Wan
authors.affiliation: School of Pharmacy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China.
authors.forename: Huili
authors.initials: H
authors.lastname: Li
mesh_terms: D004655:Emulsions; D008055:Lipids / Q000737:chemistry; D008747:Methylcellulose / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D010539:Permeability; D012212:Rheology; D013227:Steam; D013229:Stearic Acids / Q000737:chemistry*; D014465:Ultrasonics; D014783:Viscosity
chemical_list: D004655:Emulsions; D008055:Lipids; D013227:Steam; D013229:Stearic Acids; C031183:stearic acid; D008747:Methylcellulose
keywords: Blending film; Methylcellulose; Self-association; Stearic acid; Ultrasound treatment