Pressure measurement to evaluate ethanol or lactic acid production during glucose fermentation by yeast or heterofermentative bacteria in pure and mixed culture

2001 ◽  
Vol 56 (5-6) ◽  
pp. 687-692 ◽  
Author(s):  
M. Wick ◽  
J.-M. Lebeault
Keyword(s):  
Lactic Acid ◽  
Mixed Culture ◽  
Pressure Measurement ◽  
Acid Production ◽  
Lactic Acid Production ◽  
Glucose Fermentation

scholarly journals Production of L-lactic acid from Cassava peel wastes using single and mixed cultures of Rhizopus oligosporus and Lactobacillus plantarum

2014 ◽  
Vol 20 (4) ◽  
pp. 457-461 ◽  
Author(s):  
Ogbonnaya Nwokoro
Keyword(s):  
Lactic Acid ◽  
Mixed Culture ◽  
Lactobacillus Plantarum ◽  
Acid Production ◽  
Lactic Acid Production ◽  
Reducing Sugar ◽  
Rhizopus Oligosporus ◽  
Mixed Culture Fermentation ◽  
Cassava Peels ◽  
Reducing Sugar Concentration

Production of L-lactic acid using cultures of Rhizopus oligosporus and Lactobacillus plantarum was investigated. Cassava peels were hydrolyzed by boiling for 1 h in either NaOH or HCl solutions followed by neutralization to a pH of 6.2. Reducing sugar produced from the hydrolysates increased with increasing concentrations of alkali or acid. Samples hydrolyzed with HCl produced a maximum reducing sugar concentration of 402 mg/g substrate while alkali hydrolyzed samples produced a maximum reducing sugar concentration of 213 mg/g substrate. Hydrolysates were amended with 0.5% ammonium sulphate solution and inoculated with either single or mixed cultures of Rhizopus oligosporus and Lactobacillus plantarum and incubated for 48 h for lactic acid production. The best lactic acid production of 50.2 g/100g substrate was observed in a mixed culture fermentation of acid hydrolyzed peels. Mixed culture fermentation of alkali hydrolyzed peels produced a maximum lactic acid concentration of 36.4 g/100g substrate. Un hydrolyzed cassava peels inoculated with a mixed culture of the microorganisms produced only 4.6 g/100g substrate. This work reports an efficient use of cassava peels for bio-product formation through microbial fermentation.

scholarly journals Lactic Acid Production in a Mixed-Culture Biofilm Reactor †

1993 ◽  
Vol 59 (1) ◽  
pp. 203-207 ◽  
Author(s):  
Ali Demirci ◽  
Anthony L. Pometto ◽  
Kenneth E. Johnson
Keyword(s):  
Lactic Acid ◽  
Mixed Culture ◽  
Acid Production ◽  
Lactic Acid Production ◽  
Biofilm Reactor
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