title: Physical, mechanical and antimicrobial properties of starch films incorporated with ε-poly-L-lysine.
abstract: Starch/ε-poly-L-lysine (ε-PL) composite films were prepared by combining 4% (w/v) gelatinized cornstarch and varying the level of ε-PL. The physical, mechanical and antimicrobial properties of these films were investigated. Fourier-transform infrared spectra (FT-IR) showed that the carbonyl group stretching vibration band of the ε-PL molecule shifted from 1646 cm(-1) to 1673 cm(-1) in the composite films. Differential scanning calorimetry (DSC) results indicated that there were sharp endothermal peaks at 215-230 °C for the composite films. These results indicated that there was an intense interaction between the two components. The films incorporated with ε-PL showed a higher tensile strength (TS) and elongation-at-break (E) than those of the starch film alone. These composite films exhibited effective inhibition against Escherichia coli and Bacillus subtilis, films containing 2% (w/w) ε-PL effectively suppressed the growth of the tested microbes (P<0.05). The starch/ε-PL films showed a low inhibitory effect on Aspergillus niger. This antimicrobial trend of the composite films was in agreement with the results of free ε-PL.
authors: Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin University of Science and Technology, Tianjin 300457, People's Republic of China. Electronic address: zhanglmd@126.com.
authors: Liming
authors: L
authors: Zhang
authors: College of Bioengineering, Tianjin University of Science and Technology, Tianjin 300457, People's Republic of China.
authors: Ruichao
authors: R
authors: Li
authors: College of Bioengineering, Tianjin University of Science and Technology, Tianjin 300457, People's Republic of China.
authors: Feng
authors: F
authors: Dong
authors: College of Bioengineering, Tianjin University of Science and Technology, Tianjin 300457, People's Republic of China.
authors: Aiying
authors: A
authors: Tian
authors: Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin University of Science and Technology, Tianjin 300457, People's Republic of China.
authors: Zhengjun
authors: Z
authors: Li
authors: Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin University of Science and Technology, Tianjin 300457, People's Republic of China.
authors: Yujie
authors: Y
authors: Dai
mesh_terms: D000890:Anti-Infective Agents / Q000494:pharmacology*; D008239:Lysine / Q000494:pharmacology*; D013213:Starch / Q000737:chemistry*
chemical_list: D000890:Anti-Infective Agents; D013213:Starch; D008239:Lysine
keywords: Antimicrobial activity; Composite film; Cornstarch; Physical properties; ε-Poly-l-lysine