title: Structure and properties of moisture-resistant konjac glucomannan films coated with shellac/stearic acid coating.
abstract: A series of moisture-resistant konjac glucomannan films were prepared by coating shellac/stearic acid emulsion on deacetylated konjac glucomannan films (dKGM). The effect of stearic acid content on structure and properties of the coated films were investigated by field emission scanning electron microscopy (FE SEM), Fourier transform infrared spectroscopy (FT-IR), ultraviolet spectroscopy (UV), water vapor permeability (WVP), water uptake, water contact angle, and tensile testing. The results revealed that shellac in the coating adhered intimately to the surface of dKGM film, and provided a substrate for the dispersion of stearic acid which played an important role in enhancement of the moisture barrier properties and mechanical properties of the coated films. The WVP of the coated films decreased from 2.63×10(-11) to 0.37×10(-11)g/(msPa) and the water contact angle increased from 68° to 101.2° when stearic acid content increased from 0wt% to 40wt%, showing the potential applications in food preservation.
authors.affiliation: Shandong Key Laboratory of Storage and Transportation Technology of Agricultural Products, Jinan 250103, China; College of Food Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
authors.forename: Xueqin
authors.initials: X
authors.lastname: Wei
authors.affiliation: College of Food Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China. Electronic address: pang3721941@163.com.
authors.forename: Jie
authors.initials: J
authors.lastname: Pang
authors.affiliation: Shandong Key Laboratory of Storage and Transportation Technology of Agricultural Products, Jinan 250103, China. Electronic address: zcf202@163.com.
authors.forename: Changfeng
authors.initials: C
authors.lastname: Zhang
authors.affiliation: College of Food Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
authors.forename: Chengcheng
authors.initials: C
authors.lastname: Yu
authors.affiliation: College of Food Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
authors.forename: Han
authors.initials: H
authors.lastname: Chen
authors.affiliation: College of Food Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
authors.forename: Bingqing
authors.initials: B
authors.lastname: Xie
mesh_terms: D008351:Mannans / Q000737:chemistry*; D008567:Membranes, Artificial; D012116:Resins, Plant / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013229:Stearic Acids / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D008351:Mannans; D008567:Membranes, Artificial; D012116:Resins, Plant; D013229:Stearic Acids; D014867:Water; C022901:(1-6)-alpha-glucomannan; C003934:shellac; C031183:stearic acid
keywords: Deacetylated konjac glucomannan; Moisture-resistant properties; Shellca; The coated film; Water vapor permeability