Abstract: A slow releasing fertilizer system comprising polysaccharide-based hydrogel beads, and methods of making and using the same, are described.

Abstract: Uronate-containing polysaccharide hydrogels that can be photo-patterned are described. The method involves forming a hydrogel and imetal-coordinating it with a reducible metallic cation and exposing the hydrogel to light in a desired pattern. The exposure to light reduces the metallic cation and results in an irreversible change in the elastic moduli and pore size of the irradiated portions of the patterned hydrogel. The method aha the benefit of allowing the user to produce such a hydrogel in any pattern desired. Patterned hydrogels and cell substrates formed by this method are also described.

Abstract: The invention relates to a process for preparing polysaccharide-based microparticles with improved mechanical properties and hydrolytic stability. The spherical particles are useful as exfoliating agents in cosmetic formulations, in replacement of the newly banned plastic microbeads. The method comprises the preparation of hydrogel particles, drying of the particles, and a solid-state reaction that results in the covalent stabilization of the material. The invention also encompasses microparticles made using the method.