1. Biodegradable and pH-responsive nanoparticles designed for site-specific delivery in agriculture.
- Author
-
Hill MR, MacKrell EJ, Forsthoefel CP, Jensen SP, Chen M, Moore GA, He ZL, and Sumerlin BS
- Subjects
- Agriculture methods, Aspartic Acid chemical synthesis, Aspartic Acid metabolism, Aspartic Acid toxicity, Biodegradable Plastics chemical synthesis, Biodegradable Plastics toxicity, Citrus metabolism, Hydrogen-Ion Concentration, Hydrophobic and Hydrophilic Interactions, Peptides chemical synthesis, Peptides chemistry, Peptides toxicity, Seeds drug effects, Seeds metabolism, Aspartic Acid analogs & derivatives, Biodegradable Plastics metabolism, Citrus drug effects, Nanoparticles chemistry, Peptides metabolism
- Abstract
We report the synthesis and characterization of pH-responsive polysuccinimide-based nanoparticles. Polysuccinimide (PSI), a precursor to biodegradable poly(aspartic acid), was synthesized from the condensation of l-aspartic acid and subsequently functionalized with primary amines to form random amphiphilic copolymers. The copolymers formed stable nanoparticles in aqueous medium via nanoprecipitation and were subsequently loaded with a model hydrophobic molecule to demonstrate their potential as controlled-release delivery vehicles. It was found that above pH 7, the hydrophobic succinimidyl units of the PSI nanoparticles hydrolyzed to release encapsulated materials. The release rate significantly increased at elevated pH and decreased with an increasing degree of functionalization. Finally, plant toxicity studies showed that the polymer materials exhibit little to no toxic effects at biologically relevant concentrations.
- Published
- 2015
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