The microcapsules were synthesised by complex coacervation process by using biodegradable shell-forming polymers (type B) gelatine and CMC) containing TTO as a natural biocide oil. Previous studies have proved the antimicrobial activity of TTO encapsulated by complex coacervation to inhibit the growth of Klebsiella pneumoniae (Perez-Limin˜ana et al., 2012).