Microencapsulation of nutmeg essential oil by spray-drying with different wall materials

摘要

Nutmeg essential oil with volatile components is sensitive to oxygen,light,water and high temperature.Spray-drying is widely used as an encapsulation technique for improving compound stability during processing and storage.In this study,influence of encapsulated matrix on spray-dried nutmeg essential oil microcapsule was investigated using blends of maltodextrin and either gum Arabic(GA-MD),or octenyl succinic acid modified starch(OSA-MD)as wall materials.Characteristics of spray-dried powders from these 2 wall materials were evaluated and compared.Powder property analysis indicated that GA-MD microcapsules presented larger size,higher moisture and poorer flowability compared with OSA-MD microcapsules.Fourier transforms infrared spectroscopy and thermogravimetric analysis showed that both GA-MD and OSA-MD microcapsules improved the stability of nutmeg essential oil.However,GA-MD microcapsules exhibited higher storage stability than OSA-MD microcapsules.This research provided theoretical foundation for wall material choice of microcapsule and nutmeg essential oil utilization in food industry.