The invention provides a self-assembled microparticle having an acid having two or more acid groups and an organic base in a solvent. The microparticles may form into a macrostructure and provide a scaffold for cell culture. The particle is of micron scale. The microparticle may be obtained by contacting a bis-acid and organic base in a hydrophilic solvent, wherein the acid is insoluble or sparingly soluble in the hydrophilic solvent and the organic base is soluble in a hydrophilic solvent. The microparticles have antimicrobial activity and may be used in a wide range of consumer product applications, cell culture and medical products, such as wound dressings.
