Obtention and microencapsulation of bioactive brewer’s spent grain extracts to enrich cereal bars

ALONSO, SOFÍA; HERMIDA, CAROLINA; NAZARENO, MÓNICA; PIÑA, JULIANA; PACHECO, CONSUELO

Congreso; WCCE11 - 11th WORLD CONGRESS OF CHEMICAL ENGINEERING; 2023

Brewer’s spent grain (BSG) accounts for about 85% of the total brewery byproducts. Its disposal is of major concern because of the bulk quantities generated and its microbiological instability. It contains proteins, fiber and phenolic compounds, which have proven antioxidant power.The objectives of this work were to evaluate different extraction conditions in order to maximize total phenolic content (TPC) and total solids content (TSC) and to microencapsulate the obtained extracts to protect the bioactive compounds therein and functionalize a cereal bar.All extracts presented the same TPC content (2.03 ± 0.15 mgGAE/gds) except from the one obtained by UAE with a SLR of 1:10 -whose TPC content was lower-. Microencapsulated powders, dried at different inlet air temperature and total solid content, showed similar TPC (1.47 ± 0,05 mgGAE/gds), being the same as for the sprayed suspension, showing there was no significant degradation of phenolic compounds during drying. Both powders were mixed and incorporated into a cereal bar, increasing its antiradical activity (ARA) (from 1.28 ± 0.00 %/gds to 1.50 ± 0.04 %/gds), but showing no effect on the original TPC (1.54 ± 0.00 mgGAE/gds).It was possible to extract valuable compounds from an industrial residue and put them into powdered form as a strategy to stabilize them and functionalize a snack bar.