Influence of pH and initial lactate concentration on the growth ofLactobacillus plantarum

✍ Scribed by Eric Giraud; Bertrand Lelong; Maurice Raimbault

• Publisher: Springer
• Year: 1991
• Tongue: English
• Weight: 326 KB
• Volume: 36
• Category: Article
• ISSN: 1432-0614
• DOI: 10.1007/bf00164706

✦ Synopsis

Fermentation yields of Lactobacillus plantarum were measured at controlled p H between 4.0 and 8.0 and initial lactate concentrations of 0-90 g/1. Optimal growth conditions at p H 6.0 without addition of lactate gave a growth rate of 0.57 h -1 and 20 g dry biom a s s / m o l ATP formed (YATP). The pH variations resulted in a decrease in growth rate but the effect on YATP was insignificant. The addition of lactate to the medium at 0 h resulted in linear decrease in the growth rate of the culture, and all the metabolic activities were completely inhibited at 110 g/l. The YATP and b i o m a s s / substrate yield (Yx/s) remained fairly steady up to 33 g lactate/l, beyond which both yields decreased considerably.