Authors:Luciana Fernandes, W. Oliveira, J. Sztatisz, and Cs. Novák
Microencapsulation of Lippia sidoides essential oil was carried out by spray drying. Blends of maltodextrin and gum arabic were used as carrier. Spray dried microparticles
were characterized using conventional (thermogravimetry, evolved gas analysis) and combined (thermogravimetry-mass spectrometry
analysis) thermal analysis techniques in order to evaluate the abilities of carriers with different compositions in retaining
and in releasing the core vs. dynamic heating. Thermal analysis was useful to evaluate the physico-chemical interactions between
the core and carriers and to determine the protective effect of the carriers on the evaporation of essential oil.
Authors:Luciana Fernandes, W. Oliveira, J. Sztatisz, I. Szilágyi, and Cs. Novák
Inclusion complexes of Lippia sidoides essential oil and β-cyclodextrin were obtained by slurry method and its solid powdered form was prepared using spray drying.
The influence of the spray drying, as well as the different essential oil:β-cyclodextrin ratio on the characteristics of the
final product was investigated. With regard to the total oil retention 1:10 mass/mass ratio as optimal was found between the
essential oil and β-cyclodextrin.
Thermoanalytical techniques (TG, EGD, TG-MS) were used to support the formation of inclusion complex and to examine their
physicochemical properties after accelerated storage conditions. It may be assumed that the thermal properties of the complexes
were influenced not only by the different essential oil/ β-cyclodextrin ratio but also by the storage conditions. In the aspect
of their thermal stabilities, complex prepared with 1:10 m/m ratio (essential oil:β-cyclodextrin) was the most stable one.