Abstract: This specification describes the modification of starch-based nanoparticles (SNPs) by introducing one or more reactive chemical groups onto the surface of SNPs. In some examples, the SNPs are hydrophobic and have a size in the range of 10-50 nm. The SNPs may be adapted for the delivery of agrochemical agents to plants. The SNPs created herein are attractive since they are generated from a sustainable source and are generally regarded as safe (GRAS) in terms of their degradation products once they break down. In some examples, the SNPs are based on SNPs produced by existing industrial-scale production.

Abstract: The present application relates to in situ gelling hydrogel structures formed by the crosslinking of polysaccharide-based nanoparticles and functional polymers. Such systems can be designed to release the nanoparticles and/or encapsulated therapeutics either over time or in response to environmental stimuli.