Bio-Based Aerogels from Potato Residues for Glycine Storage and Controlled Release

Abstract

Biobased aerogels derived from starch offer a promising pathway for developing sustainable biomaterials. This study examines the use of starch extracted from potato peels to develop aerogels intended for glycine storage and controlled release. The reaction of starch with glutaraldehyde, used as a crosslinker, was demonstrated using Fourier-transform infrared spectroscopy, revealing the formation of hemiacetal bonds. Crosslinking enhanced thermal stability of the aerogels, as shown by thermogravimetric analysis, and improved their resistance to disintegration upon hydration. Glycine, an essential amino acid with agricultural and industrial applications, was loaded into the aerogels, and the release kinetics were evaluated under controlled conditions. Moreover, glycine acts as a neutralizing agent for residual glutaraldehyde, ensuring the suitability of the aerogel for applications where glutaraldehyde toxicity could be a concern. Structural characterization through scanning electron microscopy confirmed the porous architecture of the aerogels and revealed the presence of glycine crystals within the pores. These findings underscore the potential of crosslinked starch aerogels as eco-friendly carriers for bioactive molecules, paving the way for their application in agriculture and other fields.