Microencapsulation of chia oil and sesame oil using sporopollenin as encapsulating agent
Keywords:
Apparent effective diffusion, biopolymer, encapsulation efficiency, Lycopodium clavatum L., release profiles, vacuum encapsulationAbstract
The objective of this work was to evaluate the sporopollenin derived from Lycopodium clavatum L. as an encapsulating agent in the encapsulating properties and release rates of chia oil and sesame oil. Four types of encapsulates were formulated using the vacuum microencapsulation process with a weight ratio of encapsulated material to encapsulating agent 1:3 to incorporate the oils using the unpurified and purified biopolymer. Micrographs of all encapsulant systems showed solid hemispherical structures of uniform size (~20 μm) with nanochannel-like cavities. Compared to unpurified sporopollenin, the purified sporopollenin presented a higher encapsulation percentage for chia oil (42%) and sesame oil (29%). The oil release profiles were adequately adjusted to the power-law type model, showing that the oil release mechanism is due to apparent effective diffusion, whose diffusivity values are in the order of 2×10-14 m2 /s, showing that the method of encapsulation and the structure of the sporopollenin directly influence this transport parameter. These results show that sporopollenin could be helpful as an encapsulating agent for bioactive compounds. Additionally, more robust studies are required to demonstrate its efficacy as an encapsulating agent in other encapsulation technologies.
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