Abstract:

Essential oil extracted from Ginkgo biloba fruits by supcritical CO2 fluid extraction technique was microcapsulated by means of spray drying taking β-cyclodextrin and Arabic gum as wall materials and glycerol monostearate as stabilizer. The microcapsule formula and the spray drying parameters were optimized by orthogonal array design. The best material compositions for microencapsulation were as follows: Arabic gum/β-cyclodextrin ratio (m/m) 1:1, core material/wall materials (m/m) 1:3, material concentration (mass-volume percentage, core material plus wall materials to mixed solution) 25%, and addition amount of glyceryl monostearate 0.1%; the optimum spray drying parameters were as follows: feeding speed 30 ml/min, outlet temperature 180 ℃, and inlet temperature 80 ℃. Under the optimal conditions, the microencapsulation efficiency was 90.66%. The microcapsule products were fine yellow or yellowish particles, and the content of moisture, density, solubility and content of flavonodis were 2.28%, 0.82 g/cm3, 98.10% and 5.73 %, respectively.

Key words: essential oil from Ginkgo biloba fruits, flavonoids, microencapsulation, spray drying