
Keywords: Spray-drying; Dry powder inhaler; Insulin; Mannitol; Sodium alginate; Chitosan; Recombinant human insulin (PubChem CID: 70678557); Mannitol (PubChem CID: 6251); Sodium citrate (PubChem CID: 6224); l-alanine (PubChem CID: 5950); Sodium alginate (PubChem CI