Under conditions conductive to growth, Corynebacterium glutamicum showed higher lactate yield from glucose (1.62 +/- 0.04) in a bioelectrochemical reactor including 0.2 mM of anthraquinone 2,6-disulfonate with the electrode potential regulated at -0.6 V (vs. Ag/AgCl) than in a non-regulated environment (1.10 +/- 0.03), clarifying that low cathodic potential is beneficial for lactate production. (C) 2013, The Society for Biotechnology, Japan. All rights reserved.