Microencapsulation of essential thyme oil by spray drying and its antimicrobial evaluation against Vibrio alginolyticus and Vibrio parahaemolyticus

Abstract The aims of this research were first, to evaluate the antibacterial potential of commercial thyme essential oil against V. alginolyticus and V. parahaemolyticys and second, using the spray drying technique to produce microcapsules. chemical compounds of thyme oil and microcapsules were identified and quantified being thymol the chemical component present at the highest concentration. Oil-in-water (O/W) emulsions were prepared and the microcapsules were obtained with a spray dryer using maltodextrin as wall material (ratio 1:4). Thyme oil and the microcapsules exhibited antimicrobial activity against V. parahaemolyticus and V. alginolyticus. The spray drying process did not affect the antimicrobial activity of thyme essentialoil.

摘要 本研究旨在实现两大目标：其一，评估商用百里香精油对溶藻弧菌（V. alginolyticus）与副溶血弧菌（V. parahaemolyticus）的抗菌活性；其二，采用喷雾干燥技术制备微胶囊。研究人员对百里香油及微胶囊中的化学成分进行了定性鉴定与定量分析，结果表明麝香草酚（thymol）为其中浓度最高的组分。实验制备了水包油（O/W）乳液，并以麦芽糊精作为壁材（质量比1:4），通过喷雾干燥机制备得到微胶囊。百里香油与所制得的微胶囊均对副溶血弧菌及溶藻弧菌表现出抗菌活性，且喷雾干燥工艺并未对百里香精油的抗菌活性产生影响。