Encapsulation, with and without oil, of biofilm forming Lactobacillus fermentum UCO-979C strain in alginate-xanthan gum and its anti-Helicobacter pylori effect

•L. fermentum UCO-979C was encapsulated in alginate-xanthan gum with or without oil.•Capsules containing biofilms released probiotic when exposed to pH 3.0 for 90 min.•Probiotics released at pH 3.0 maintained its H. pylori inhibitory activity.•Bacterial counts were higher when capsules were kept at 4 °C instead of 25 °C.•Exopolysaccharides was higher in capsules without oil containing biofilm.