Growth characteristics ofGeotrichum ingenson propionic acid and acetic acid in batch and continuous culture

✍ Scribed by E. Vorster; S. G. Kilian; J. C. Preez

• Publisher: Springer
• Year: 1994
• Tongue: English
• Weight: 415 KB
• Volume: 10
• Category: Article
• ISSN: 1573-0972
• DOI: 10.1007/bf00367654

✦ Synopsis

Growth of Geotrichum ingens in batch cultures was completely inhibited by 47 g acetic acid/l or 33 g propionic acid/I. With mixtures of acetic and propionic acids, however, growth only ceased at 55 g/l. Acetic acid inhibited growth linearly, whereas propionic acid inhibited growth non-linearly. In continuous culture, two steady states at each dilution rate were observed at high dilution rates for acetic acid and propionic acid. The highest yield coefficient (0.69 g cells/g substrate) was achieved with propionic acid as substrate. On both substrates and their mixtures, the protein content of the biomass increased when the dilution rate was increased.