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Electronic Journal of Biotechnology

versión On-line ISSN 0717-3458

Resumen

KRZYWONOS, Magorzata  y  EBERHARD, Thomas. High density process to cultivate Lactobacillus plantarum biomass using wheat stillage and sugar beet molasses. Electron. J. Biotechnol. [online]. 2011, vol.14, n.2, pp.6-6. ISSN 0717-3458.

Background: Owing to the growing interest in biofuels, the concept of a biorefinery where biomass is converted to a variety of useful products is gaining ground. We here present how distillery waste is combined with a by-product from a sugar production, molasses, to form a medium for the growth of Lactobacillus plantarum with yields and biomass densities comparable with conventional industrial media. Such approach enables a cost-effective utilization of the problematic wastewater from ethanol and a by-product from sugar production. It is the first approach that attempts to find low-cost media for the production of Lactobacillus plantarum biomass. Results: This study suggests that sieved wheat stillage enriched by adding 1.77 g/l yeast extract and 10% molasses (v/v), with NH4OH used for pH adjustment, may be used as a media for large-scale cultivation of L. plantarum. Such composition of the medium permits a high density of lactic acid bacteria (1.6 x 1010 cfu/ml) to be achieved. Conclusions: The use of a fermentation medium consisting of distillery wastewater and molasses to obtain value-added products (such as LAB biomass and lactic acid) is a possible step for classical ethanol production to move towards a biorefinery model production in which all by and waste products are utilized to increase produced values and reduce waste production. This enables a cost-effective utilization of the problematic wastewater from ethanol and sugar production.

Palabras clave : distillery wastewater; high density fermentation; lactic acid bacteria; Lactobacillus plantarum; sugar beet molasses; wheat stillage.

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