Physicochemical characterization and antimicrobial activity in novel systems containing buriti oil and structured lipids nanoemulsions

[Display omitted] •Nanoemulsions of buriti oil (NBO) and nanoemulsions of structured lipids (NBO6h, NBO24h) were prepared by high-pressure homogenization.•Use of nanoemulsion ofstructured lipid NBO24 h reduced droplet size.•Nanoemulsions (NBO24 h) had higher oxidative stability.•Nanoemulsion of structured lipid showed bacteriostatic activity. Buriti oil nanoemulsions were prepared using non-interesterified buriti oil or buriti oil interesterified for 6 or 24 h (NBO, NBO6h, and NBO24 h), respectively. The aim was to investigate the effects of interesterified oils on the physicochemical and biological properties of nanoemulsions. Samples were stored at 4 and 25 °C for 30 days, and their physicochemical properties and biological activities were evaluated. The mean droplet diameter of nanoemulsions ranged from 196 to 270 nm. NBO24 h had the smallest droplet size and was the most stable during the storage period. Furthermore, NBO24 h demonstrating the good oxidative stability, had a high antioxidant capacity, and was less susceptible to droplet aggregation. NBO and NBO24 h had similar biological activity against Gram-negative bacteria (Escherichia coli O157: H7); bacterial growth was inhibited by at least 60% at 3.12 mg mL−1. The nanoemulsions have interesting properties for the production of pharmaceutical, cosmetic, and food formulations with antimicrobial activity.