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The aim of this study was to select among lactic acid bacteria (LAB) and yeast a potential β-galactosidase producer, based on bioprocess parameters. From the selected microorganism,  different organic cheaper nitrogen sources (single and combined) with low cost for β-galactosidase production were evaluated.  Lactobacillus reuteri  B-14171 showed the highest enzymatic activity (1,286 U L −1 ), high productivity (28.78 U L h −1 ) and yield factor (82.32 U g −1 ), evidencing its potential for β-galactosidase production. All organic nitrogen sources tested were viable for the enzymatic production using  L. reuteri  B-14171. The MMRS casein (3.0 g L −1 ) + inactive beer yeast (3.0 g L −1 ) as nitrogen source increased the enzymatic activity (1269 U L −1 ) with 1.83 times lower production costs of culture medium when compared to MMRS-yeast extract B. The MMRS casein + inactive beer yeast has proved to be an innovative and cheaper nitrogen source for β-galactosidase production by  L. reuteri  B-14171.

international journal of food engineering

Increase in an Intracellular β-Galactosidase Biosynthesis Using  L. reuteri  NRRL B-14171, Inducers and Alternative Low-Cost Nitrogen Sources under Submerged Cultivation