Lactobacillus plantarum strains for multifunctional oat-based foods

• Fermented oat-based foods are suitable substrates for delivery probiotic LAB.
• Riboflavin-overproducing LpB2 increased the vitamin B2 content of oat-based products.
• EPS-producing Lp90 seems to improve some rheological features.

Fermented oat-based foods offer attractive prospects within the market of non-dairy functional products, since they are suitable substrates for the delivery of probiotic microorganisms, and are significant sources of dietary fiber, both insoluble and soluble such as β-glucan, good quality fat and other phytochemicals important for human health.In the present work, whole oat flour was fermented with probiotic Lactobacillus plantarum strains to produce new functional foods with improved nutritional and technological features. Viability of the probiotic and the main technological, physico-chemical, nutritional and sensorial parameters were monitored at 7, 14 and 21 days of cold storage. The microbial survival was higher than 5x108 cfu g−1 at the end of the shelf life. After the fermentation step, viscosity was higher in products inoculated with the exopolysaccharide-producing L. plantarum strain Lp90. However, a subsequent viscosity reduction was detected in all the samples throughout the storage period, consistent with the observed concentration decrease of the oat β-glucan. Vitamin B2 content was about two-fold higher in products fermented by the riboflavin-overproducing LpB2, and in these samples the riboflavin concentration further increased during cold storage.