Enzymatic and soil burial degradation of corn starch/glycerol/sodium montmorillonite nanocomposites

Abstract

In this study, effects of glycerol (10, 20, and 30 wt%) and Sodium Montmorillonite (Na-MMT) (0%, 2.5%, and 5%) contents on the degradation of corn starch polymers were investigated. Films were prepared by casting corn starch solution using a modified method to enhance the nanoclay distribution. Biodegradability studies were performed by enzymatic and burial tests using pristine and enriched soils. The biodegradability of samples in pristine soil was faster, and all samples were fully degraded in 6 months. The effect of nanoparticles on the mass reduction in degradation was more pronounced than that of glycerol. In all glycerol concentrations, Na-MMT addition increased tensile strength. FTIR tests showed that degradability was related to glycerol leaching at first and then cleaving of α-1,4 bonds of starch, indicating the action of α-amylase produced by soil microorganisms. Good agreement between soil burial tests and enzymatic degradation was observed. An optimum Glycerol/Clay ratio was observed at which d-spacing and mechanical properties were maximum.

Multifunctional biocompatible films based on pectin‐Ag nanocomposites and PVA: Design, characterization and antimicrobial potential

“…The strong affinity of glycerol to water (due to the hydrophilic nature of plasticizer) acts as a strong driving force for leaching of glycerol from pectin‐Ag/PVA film immersed in PBS. The similar effect was also observed for glycerol‐containing films based on starch, 78 starch and chitosan, 79 starch and montmorillonite 80 . It should be noted that the final content of glycerol in the pectin‐Ag/PVA film was 32.75 wt%, which corresponds with the minimum weight loss (~30 wt%) typical for films based on poorly soluble PVA 145000.…”

“…The similar effect was also observed for glycerolcontaining films based on starch, 78 starch and chitosan, 79 starch and montmorillonite. 80 It should be noted that the final content of glycerol in the pectin-Ag/PVA film was 32.75 wt%, which corresponds with the minimum weight loss ($30 wt%) typical for films based on poorly soluble PVA 145000.…”

Recent developments of Madhuca indica (Mahua) oil-based polymers: A mini review

“…VOs are among the most significant renewable materials for polymers because of their widespread availability, natural biodegradability, low cost, minimal ecotoxicity and nontoxicity to humans. [11][12][13][14] The VOs are extracted from seeds or, less often, from other pieces of plants. India is rich in forest resources and has a wide variety of trees that produce a large number of oilseeds.…”

Mechanical and Degradation Properties of Thermoplastic Starch Reinforced Nanocomposites

“…C–H stretching bands (aliphatic compounds) for all the samples occurred in the range of 2800–3000 cm –1 . [ 26 ] The characteristic band of nano‐biocomposites appeared around 1031 cm –1 for TPSC3, and 1013 cm –1 for its degraded sample that attributed for silicate layers (Si─O─Si) stretching. Transmittance peak in the range of 1720–1750 cm –1 for TPSC0 and TPSC3 sample were obtained due to C = O stretching of starch (Xylan of hemicellulose), and were shifted and diminished respectively for their corresponding degraded samples.…”