Tensile properties, barrier properties, and biodegradation in soil of compression—Molded gelatin‐dialdehyde starch films

Abstract

Glycerol (Gly)-plasticized gelatin (Ge) films crosslinked with dialdehyde starch (DAS) as environmentally friendly crosslinking agent were successfully produced by compression molding, demonstrating the capacity of gelatin of being transformed into films by using thermoplastic processes. The effect of DAS content on the color, light transmission, total soluble matter (TSM), water uptake (WU), water vapor permeability (WVP), oxygen permeability (OP) as well as biodegradability during soil burial was investigated. The addition of up to 10 wt % DAS (Ge-10DAS) generated transparent films, with reduced TMS, WU, WVP, and OP values but higher extensivity than the uncrosslinked counterpart. Further incorporating DAS into plasticized-gelatin matrix conducted to phase separation with detrimental effect of transparency and tensile properties. DAS-containing films degraded at slow rate than the uncrosslinked counterpart, suggesting that biotic attack during soil burial is restricted by covalent crosslinking points induced by DAS. Ge-10DAS films lost about 28% of their initial mass within the first 8 days of exposure to degrading medium; therefore, the material can be classified as rapidly degradable.

Soybean protein films. Characterization and potential as novel delivery devices of Duddingtonia flagrans chlamydospores

“…The larger diameter and 523 inhomogeneous distribution of the dispersed phase could be the main thing responsible 524 for the decreased tensile properties at high DAS content. This result agreed well with 525 that reported for gelatin films cross-linked with DAS (Martucci and Ruseckaite, 2009). 526…”

Keratin/Polyvinyl Alcohol Blend Films Cross-Linked by Dialdehyde Starch and Their Potential Application for Drug Release

“…For example, in drug-release applications, a high film integrity and stability in a humid environment are required over a relatively long period of time. Generally, cross-linking is the most common and useful method to reduce the TSM of protein-based films in water [37][38][39]. The TSM values obtained for the FK/PVA blended films cross-linked by DAS in water at 37 °C are listed in Figure 4.…”

“…Rhim et al reported that the TSM of cast soy protein isolate films was significantly reduced by up to 50% by adding DAS [26]. Martucci et al also reported that gelatin films with DAS-induced cross-linking exhibited a substantially lower solubility in water than films without a DAS treatment [39]. The soluble substance in the FK/PVA blend films could be the PVA, excessive DAS, and/or low molecular weight peptide chains that could not be cross-linked by DAS.…”

Effect of crosslinking on the properties of sodium caseinate films

“…The curves were fitted with the Peleg equation, 33,34 which relates the instantaneous M t to the initial moisture content (M 0 ), as shown in Eq. (3):…”