Batch fermentation model of propionic acid production by Propionibacterium acidipropionici in different carbon sources.
Propionic acid (PA) is widely used as additive in animal feed and also in the manufacturing of cellulose-based plastics, herbicides, and perfumes. Salts of propionic acid are used as preservative in food. PA is mainly produced by chemical synthesis. Nowadays, PA production by fermentation of low-cost industrial wastes or renewable sources has been an interesting alternative. In the present investigation, PA production by Propionibacterium acidipropionici ATCC 4965 was studied using a basal medium with sugarcane molasses (BMSM), glycerol or lactate (BML) in small batch fermentation at 30 and 36 degrees C. Bacterial growth was carried out under low dissolved oxygen concentration and without pH control. Results indicated that P. acidipropionici produced more biomass in BMSM than in other media at 30 degrees C (7.55 g l(-1)) as well as at 36 degrees C (3.71 g l(-1)). PA and biomass production were higher at 30 degrees C than at 36 degrees C in all cases studied. The best productivity was obtained by using BML (0.113 g l(-1) h(-1)), although the yielding of this metabolite was higher when using glycerol as carbon source (0.724 g g(-1)) because there was no detection of acetic acid. By the way, when using the other two carbon sources, acetic acid emerged as an undesirable by-product for further PA purification.
Coral
Jefferson
J
Biotechnology and Bioprocess Engineering Division, Federal University of Parana, 81531-970, Curitiba, Paraná, Brazil, jefferson_coral@ufpr.br.
Karp
Susan Grace
SG
Porto de Souza Vandenberghe
Luciana
L
Parada
José Luis
JL
Pandey
Ashok
A
Soccol
Carlos Ricardo
CR
D018533:Biomass; D003470:Culture Media; D005285:Fermentation; D005990:Glycerol / Q000378:metabolism; D019344:Lactic Acid / Q000378:metabolism; D008965:Molasses; D011422:Propionates / Q000378:metabolism*; D011424:Propionibacterium / Q000254:growth & development / Q000378:metabolism*; D013696:Temperature
D003470:Culture Media; D011422:Propionates; D019344:Lactic Acid; C029658:propionic acid; D005990:Glycerol