Preparation of biopolymer film from chitosan modified with lipid fraction

作者：Souza Vanderlei C; Monte Micheli L; Pinto Luiz A A^*

来源：International Journal of Food Science and Technology, 2011, 46(9): 1856-1862.

DOI：10.1111/j.1365-2621.2011.02692.x

• Biopolymer films
• chitosan
• fatty acid
• fish oil
• lipids
• vegetable oil

Films formed from polysaccharides, as chitosan, present a high permeability in water vapour. In order to increase resistance to water vapour for chitosan-based films, different lipid fractions were incorporated into a filmogenic matrix: fish and vegetable oils, stearic and oleic acids. The chitosan showed a molecular weight of 150 kDa and a deacetylation degree of 86 +/- 1%. Results showed that incorporation of different lipid fractions decreased the water vapour permeability (WVP) (1.3-1.8 g mm m(-2) day(-1) kPa(-1)) as compared with pure chitosan film (3.8 g mm m(-2) day(-1) kPa(-1)). A higher reduction in WVP (65%) was found with the addition of refined fish oil to the continuous matrix of the films than with the addition of refined rice oil, oleic or stearic acid (50-60%). However, pure chitosan films showed better tensile strength (TS = 33 MPa) and elongation percentage (E = 18%) than lipids fraction-chitosan films (7-19 MPa and 7-13%, respectively).

• 出版日期2011-9