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，评估商用麝香草精油对溶藻弧菌（Vibrio alginolyticus，简称V. alginolyticus）与副溶血弧菌（Vibrio parahaemolyticus，原文笔误作V. parahaemolyticys）的抗菌潜力；其二，采用喷雾干燥（spray drying）工艺制备微胶囊（microcapsules）。本研究对麝香草精油及其微胶囊的化学成分进行了定性与定量分析，结果显示百里香酚（thymol）为其中含量最高的化学组分。实验制备了水包油（oil-in-water, O/W）乳液，并以麦芽糊精（maltodextrin）作为壁材，物料比为1:4，通过喷雾干燥仪制备得到目标微胶囊。麝香草精油及其微胶囊均对副溶血弧菌与溶藻弧菌表现出抗菌活性，且喷雾干燥工艺并未影响麝香草精油的抗菌活性。