3.2. Determination of the antimicrobial activity of LAB
The study of antimicrobial activity between LAB allowed the selection of the strains with the highest inhibitory activity. Eighty strains, previously isolated from brewer's grains, were assayed for their antagonistic activity against other LAB. Fifty nine strains showed inhibition halos that ranged between 2.5 and 19.5 mm. Of these, eight strains (13.6%) exhibited inhibition halos lower than 5 mm, 26 (44%) showed halos between 5 and 10 mmand 25 strains had inhibition halos higher than 10 mm (42.4%). Those LAB which showed inhibition halos greater than 10 mm were selected for further studies (Table 1).