*2.3. Microencapsulation*

Leaf essential oil microencapsulated with β-cyclodextrin was using the co-precipitation method with slight revisions [35–37]. β-Cyclodextrin (5 g) was first dissolved in 300 mL different ratio of ethanol/water solution at 50 ◦C for 5 min; the solution was cooled down to 25 ◦C. Linalool/leaf essential oil (0.88 g) was dissolved in 10 mL ethanol; and then added to the β-cyclodextrin solution, stirred at 600 rpm for 1 h. The solution was kept in the refrigerator at 4 ◦C overnight; the co-precipitated microcapsules were filtered and then washed with 50 mL distilled water. Microcapsules were dried at 50 ◦C in the oven for 24 h. The yield of leaf oil microcapsules was calculated by the following Formula (1).

Yield (%) = microcapsules (g)/[β-cyclodextrin (g) + leaf essential oil (g)] × 100 (1)
