PERMEABILITY AND MECHANICAL-PROPERTIES OF CELLULOSE-BASED EDIBLE FILMS

Factors affecting barrier properties [oxygen permeability (OP) and wat er vapor permeability (WVP)] and mechanical properties [tensile streng th (TS) and elongation (E)] were investigated for methyl cellulose (MC ) and hydroxypropyl cellulose (HPC) films. OP, WVP and TS of MC and HP C films increased as the molecular weight (MW) of the cellulose increa sed. E of MC films increased as MW increased, but E of HPC films was h ighest for the intermediate MW of 370,000. OP, WVP and TS of MC films were not a function of thickness, but E slowly increased as film thick ness increased. OP and WVP of HPC films were not relatable to film thi ckness, but TS and E of HPC films slowly increased as film thickness i ncreased. TS decreased and E increased for both film types as concentr ation of plasticizers was increased. Plasticizers enhanced or retarded OP and WVP of cellulose-based films, depending on their concentration s.