摘要 |
Encapsulation of active materials in chitosan beads of uniform size and improved mechanical and chemical stability. The active material is suspended in an acidic aqueous solution of a chitosan having a molecular weight of less than 250,000, the suspension is added dropwise to a crosslinking solution of diphosphate and glyoxal hydrated and the resulting beads are cured. It is possible to coat the active material with oil prior to suspension. |