Development of cost-effective media to increase the economic potential for larger-scale bioproduction of natural food additives by Lactobacillus rhamnosus , Debaryomyces hansenii , and Aspergillus niger.
Yeast extract (YE) is the most common nitrogen source in a variety of bioprocesses in spite of the high cost. Therefore, the use of YE in culture media is one of the major technical hurdles to be overcome for the development of low-cost fermentation routes, making the search for alternative-cheaper nitrogen sources particularly desired. The aim of the current study is to develop cost-effective media based on corn steep liquor (CSL) and locally available vinasses in order to increase the economic potential for larger-scale bioproduction. Three microorganisms were evaluated: Lactobacillus rhamnosus , Debaryomyces hansenii , and Aspergillus niger . The amino acid profile and protein concentration was relevant for the xylitol and citric acid production by D. hansenii and A. niger , respectively. Metals also played an important role for citric acid production, meanwhile, D. hansenii showed a strong dependence with the initial amount of Mg(2+). Under the best conditions, 28.8 g lactic acid/L (Q(LA) = 0.800 g/L.h, Y(LA/S) = 0.95 g/g), 35.3 g xylitol/L (Q(xylitol) = 0.380 g/L.h, Y(xylitol/S) = 0.69 g/g), and 13.9 g citric acid/L (Q(CA) = 0.146 g/L.h, Y(CA/S) = 0.63 g/g) were obtained. The economic efficiency (E(p/euro)) parameter identify vinasses as a lower cost and more effective nutrient source in comparison to CSL.
Salgado
José Manuel
JM
Department of Chemical Engineering, University of Vigo (Campus Ourense), As Lagoas s/n, 32004 Ourense, Spain.
Rodríguez
Noelia
N
Cortés
Sandra
S
Domínguez
José Manuel
JM
D001234:Aspergillus niger / Q000737:chemistry / Q000378:metabolism*; D019343:Citric Acid / Q000032:analysis / Q000378:metabolism; D003362:Cost-Benefit Analysis; D003470:Culture Media / Q000032:analysis / Q000191:economics* / Q000378:metabolism; D055165:Debaryomyces / Q000737:chemistry / Q000378:metabolism*; D005285:Fermentation; D005503:Food Additives / Q000032:analysis / Q000378:metabolism*; D007218:Industrial Microbiology / Q000191:economics* / Q000379:methods*; D019344:Lactic Acid / Q000032:analysis / Q000378:metabolism; D052201:Lacticaseibacillus rhamnosus / Q000737:chemistry / Q000378:metabolism*; D014993:Xylitol / Q000032:analysis / Q000378:metabolism
D003470:Culture Media; D005503:Food Additives; D019343:Citric Acid; D019344:Lactic Acid; D014993:Xylitol