Microbial activity of lactic acid bacteria and hydrogen producers mediated by pH and total solids during the consolidated bioprocessing of agave bagasse.

ABSTRACT: Lactic acid bacteria (LAB) coexist with Clostridium spp. in hydrogen production processes from complex substrates; however, the role of LAB is still unclear. This study analyzed the fermentation products in a wide range of initial pH (pH_i, 5.5-6.9) and total solids (TS%, 8-22%) to determine the activity of these two microbial groups over time (from 24 to 120 h). Agave bagasse served as the feedstock for hydrogen production via consolidated bioprocess (CBP), while the inoculum source was the indigenous mature microbiota. In the early stage of the CBP, hydrogen production from lactic acid occurred only at pH_i ≥ 6.0 (ρ = 0.0004) with no effect of TS%; lactic acid accumulated below this pH_i value. In this stage, lactic acid production positively correlated with

SUBMITTER: Dudek K 

PROVIDER: S-EPMC10789659 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature