Abstract
The effect of pectin surface density (ρ s) on the engineering properties of high methoxyl (HM) pectin-based edible films was determined in order to explore the role of ρ s on structure and functional properties. Films at different ρ s values (2.5, 3.2, 3.8, 4.5, 5.1, 5.8 mg cm−2) were analyzed by means of microscopy, thermal, mechanical, and barrier (water vapor permeability WVP, oxygen permeability \( {\text{kP}}_{{{\text{O}}_2 }} \), carbon dioxide permeability \( {\text{kP}}_{{{\text{CO}}_2 }} \)) properties. Microscopy, thermal, and mechanical results showed that by increasing ρ s from 2.5 to 5.8 mg cm−2, the film structure does not change. HM pectin-based film has a tensile strength of 20 ± 7 MPa and an elastic modulus (E) equal to 2,400 ± 200 MPa. However, it is quite brittle as the elongation to break (e) is close to 1%. Although the film structure was unaffected by ρ s, WVP increased with the rise in ρ s while \( {\text{kP}}_{{{\text{O}}_2 }} \) and \( {\text{kP}}_{{{\text{CO}}_2 }} \) decreased. On the whole, HM pectin-based film showed barrier properties comparable to biodegradable commercial film and low selectivity.
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Giancone, T., Torrieri, E., Di Pierro, P. et al. Effect of Surface Density on the Engineering Properties of High Methoxyl Pectin-Based Edible Films. Food Bioprocess Technol 4, 1228–1236 (2011). https://doi.org/10.1007/s11947-009-0208-9
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DOI: https://doi.org/10.1007/s11947-009-0208-9