Barrier, Mechanical and Optical Properties of Plasticized Yam Starch Films

MALI, S.; GROSSMANN, M.V.; GARCIA, M.A.; MARTINO, M.N.; ZARITZKY, N.E.

CARBOHYDRATE POLYMERS

Año: 2004 vol. 56 p. 129 - 135

0144-8617

Yam starch films were obtained by casting. Effect of different film thicknesses (0.07, 0.09, 0.11 mm) and concentrations of glycerol (1.30, 1.65 and 2.00% w/w) and starch (3.30, 3.65 and 4.00% w/w) on filmogenic solution were evaluated. Barrier, mechanical and optical properties of films were analyzed. Films were homogeneous and transparent without insoluble particles. Water vapor and O2 permeabilities increased with glycerol concentration. Opacity of yam starch films depended on film thickness, the higher the thickness, the more opaque the sample. Films with 4.00% w/w starch, 1.30% w/w glycerol and 0.11 mm thikness gave the highest puncture strength. Puncture deformation increased with glycerol content.