New microencapsulation system for ascorbic acid using pea protein concentrate as coat protector.

Microencapsulation is essential to preserve biological activity of ascorbic acid (AA) and pea protein has not been used as a carrier in such processes. This work aimed to produce microparticles by a spray-drying process using pea protein (PPC) as wall material of AA and evaluate the retention of the core by HPLC, overall morphology SEM, size distribution by light scattering and release kinetics. Carboxymethylcellulose (CMC) and blends with maltodextrin (M) were produced for comparative analyses. The yields were compatible with the applied technology and the retention was above 84% for all materials. The PPC microparticles presented irregular and rough surfaces, CMC produced a regular and smooth surface and agglomeration was more intense in microparticles with M. Mean particle diameters were all below 8 microm. The microparticle release rates were lower than those with free AA, being best correlated to the Higuchi kinetic model. These results support the utilization of PPC for microencapsulation of AA.