title: Physicochemical, mechanical and thermal properties of chitosan films with and without sorbitol.
abstract: The effect of sorbitol on the physicochemical, mechanical and thermal properties of chitosan films with different degrees of deacetylation (DD; i.e., DD85% and DD95%) was investigated. The thickness, moisture content (MC), water solubility (WS) and water-vapor permeability (WVP) of the films were evaluated. Sorbitol addition reduced MC, increased WS and significantly (p<0.01) reduced WVP of both film types. DD95% films had lower MC and WVP, and higher WS than DD85% films. Static (thermomechanical analysis) and dynamic (dynamic mechanical analysis) tests indicated that sorbitol increased the strain and decreased stress for both DD films, but DD95% could sustain higher strain and DD85% could sustain higher stress. Thermogravimetrics analysis and differential scanning calorimetry showed that sorbitol elicited a lower degradation temperature for both films, and that DD95% films exhibited higher thermal stability than DD85% films.
authors.affiliation: School of Tea and Food Technology, Anhui Agricultural University, 130 Chang Jiang West Road, Hefei 230036, China. Electronic address: liumeify@gmail.com.
authors.forename: Mei
authors.initials: M
authors.lastname: Liu
authors.affiliation: School of Tea and Food Technology, Anhui Agricultural University, 130 Chang Jiang West Road, Hefei 230036, China. Electronic address: zhouyibin@ahau.edu.cn.
authors.forename: Yibin
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: School of Tea and Food Technology, Anhui Agricultural University, 130 Chang Jiang West Road, Hefei 230036, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: School of Tea and Food Technology, Anhui Agricultural University, 130 Chang Jiang West Road, Hefei 230036, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Yu
authors.affiliation: School of Tea and Food Technology, Anhui Agricultural University, 130 Chang Jiang West Road, Hefei 230036, China.
authors.forename: Shengnan
authors.initials: S
authors.lastname: Cao
mesh_terms: D055598:Chemical Phenomena / Q000187:drug effects*; D048271:Chitosan / Q000737:chemistry*; D055595:Mechanical Phenomena / Q000187:drug effects*; D013012:Sorbitol / Q000494:pharmacology*; D013818:Thermogravimetry
chemical_list: D013012:Sorbitol; D048271:Chitosan
keywords: Chitosan film; Mechanical; Physicochemical; Sorbitol; Thermal properties