Open AccessEdible starch films and coatings characterization: scanning electron microscopy, water vapor, and gas permeabilities
Author(s) -
García María A.,
Martino Miriam N.,
Zaritzky Noemí E.
Publication year - 1999
Publication title -
scanning
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.359
H-Index - 47
eISSN - 1932-8745
pISSN - 0161-0457
DOI - 10.1002/sca.4950210508
Subject(s) - plasticizer , microstructure , scanning electron microscope , materials science , water vapor , chemical engineering , amylose , starch , composite material , coating , chemistry , organic chemistry , engineering
Effects of coating formulation (starch type and plasticizer) on microstructure, water vapor, and gas permeabilities of films and coatings were analyzed. Plasticizer addition was necessary for films and coatings integrity to avoid pores and cracks. A satisfactory correlation between microstructure observations by scanning electron microscopy, electronic thickness measurements, and water vapor and gas permeability determinations was observed. Films and coatings with high amylose content starches showed lower water vapor and gas permeabilities compared with films and coatings with medium amylose content starches. Films and coatings with sorbitol showed lower water vapor and gas permeabilities than those with glycerol, with the most effective plasticizer concentration being 20 g/l.