Effect of reducing agents on the acidification capacity and the proton motive force of Lactococcus lactis ssp. cremoris resting cells.

摘要: Abstract Reducing agents are potential inhibitors of the microbial growth. We have shown recently that dithiothreitol (DTT), NaBH 4 and H 2 can modify proton motive force resting cells Escherichia coli by increasing membrane protons permeability [Eur. J. Biochem. 262 (1999) 595]. In present work, effect reducing on Lactococcus lactis ssp. cremoris , a species widely employed in dairy processes was investigated. DTT did not affect acidification nor ΔpH, contrast to previously reported E. . The Δ Ψ slightly increased (30 mV) at low pH (pH 4) presence 31 mM or 2.6 case Na S O small amounts (0.9 mM) drastically decreased range this product abolish ΔpH. These results discussed terms diversity action chemical reagents strain sensitivity.