Preparation Process Optimization and Quality Analysis of Bergamot Essential Oil Microcapsules
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Abstract:
In this study, the preparation process of microcapsules using bergamot essential oil as the raw material was optimized, including wall material combination, emulsification process (emulsifier composition and dosage, core-to-wall material ratio ) and spray drying conditions (inlet air temperature, atomizer frequency, feed flow rate). The optimal process parameters for microencapsulation of bergamot essential oil were first determined, and then the quality and microstructure of the resulting essential oil microcapsule products were analyzed. The results showed that the optimal conditions for preparing the bergamot essential oil microcapsules were: (1) The optimum ratio of wall material (arabic gum : β-cyclodextrin : maltodextrin) was 9:7:4 (g:g:g); (2) The optimum conditions for emulsification included the ratio of composite emulsifier (monoglyceride : sucrose ester) as 3:7 (g:g), a dosage of 0.8% for this composite emulsifier ,and the core-to-wall material ratio as 3:7 (g/g); (3) The optimized spray drying process was at an inlet air temperature of 180 ℃, atomizer frequency of 30 Hz, and feed flow rate of 55 mL/min. Under such optimal microcapsulation conditions, the obtained bergamot essential oil microcapsules possessed good sensory, physico-chemical and sustained release properties. The encapsulation rate and solubility of the products were as high as 85.32% and 93.25%, respectively, with the water content only at 2.65%. After being heated for 15 h, the products had only a volatilization rate of 12.24%, which was 79.47% lower than the unencapsulated products. The results of scanning electron microscopy showed that the obtained bergamot essential oil microcapsules were spherical in shape with smooth and continuous surfaces. Therefore, high-quality bergamot essential oil microcapsules could be produced under the optimized conditions.
