title: Structural changes and triacetin migration of starch acetate film contacting with distilled water as food simulant.
abstract: This work studied the structural changes and the migration of triacetin plasticizer in starch acetate films in the presence of distilled water as food simulant. Fourier-transform infrared spectroscopy result showed that the macromolecular interaction was enhanced to form compact aggregation of amorphous chains. The characterization of aggregation structures via wide and small angle X-ray scattering techniques indicated that the orderly microregion was compressed and the crystallites inside were "squeezed" to form interference and further aggregation. The compact aggregation structures restricted the mobility of macromolecules, triacetin and water molecules. The overall kinetic and the diffusion model analysis manifested that Fick's second law was the predominant mechanism for the short-term migration of triacetin. The increasing relaxation within film matrix caused the subsequent migration to deviate from Fick's law. The safe and reasonable application of the starch-based materials with restrained plasticizer migration could be accomplished by controlling the molecular interaction and aggregation structures.
authors.affiliation: Ministry of Education Engineering Research Center of Starch & Protein Processing, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, College of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510640, China; College of Chemistry and Environmental Engineering, Dongguan University of Technology, Dong Guan, 523808, China. Electronic address: zhujie2009@163.com.
authors.forename: Jie
authors.initials: J
authors.lastname: Zhu
authors.affiliation: Ministry of Education Engineering Research Center of Starch & Protein Processing, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, College of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510640, China.
authors.forename: Xiaoxi
authors.initials: X
authors.lastname: Li
authors.affiliation: Ministry of Education Engineering Research Center of Starch & Protein Processing, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, College of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510640, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Huang
authors.affiliation: Ministry of Education Engineering Research Center of Starch & Protein Processing, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, College of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510640, China.
authors.forename: Ling
authors.initials: L
authors.lastname: Chen
authors.affiliation: Ministry of Education Engineering Research Center of Starch & Protein Processing, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, College of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510640, China. Electronic address: felinli@scut.edu.cn.
authors.forename: Lin
authors.initials: L
authors.lastname: Li
mesh_terms: D000085:Acetates / Q000737:chemistry; D009038:Motion; D012997:Solvents / Q000737:chemistry*; D013213:Starch / Q000737:chemistry*; D014215:Triacetin / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D000085:Acetates; D012997:Solvents; D014867:Water; D013213:Starch; D014215:Triacetin
keywords: Film; Migration; Plasticizer; Starch acetate; Structural changes