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Lactobacillus reuteri CRL 1101 highly produces mannitol from sugarcane molasses as carbon source

  • Applied microbial and cell physiology
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An Erratum to this article was published on 04 August 2012


Mannitol is a natural polyol extensively used in the food industry as low-calorie sugar being applicable for diabetic food products. We aimed to evaluate mannitol production by Lactobacillus reuteri CRL 1101 using sugarcane molasses as low-cost energy source. Mannitol formation was studied in free-pH batch cultures using 3–10% (w/v) molasses concentrations at 37 °C and 30 °C under static and agitated conditions during 48 h. L. reuteri CRL 1101 grew well in all assayed media and heterofermentatively converted glucose into lactic and acetic acids and ethanol. Fructose was used as an alternative electron acceptor and reduced it to mannitol in all media assayed. Maximum mannitol concentrations of 177.7 ± 26.6 and 184.5 ± 22.5 mM were found using 7.5% and 10% molasses, respectively, at 37 °C after 24-h incubation. Increasing the molasses concentration from 7.5% up to 10% (w/v) and the fermentation period up to 48 h did not significantly improve mannitol production. In agitated cultures, high mannitol values (144.8 ± 39.7 mM) were attained at 8 h of fermentation as compared to static ones (5.6 ± 2.9 mM), the highest mannitol concentration value (211.3 ± 15.5 mM) being found after 24 h. Mannitol 2-dehydrogenase (MDH) activity was measured during growth in all fermentations assayed; the highest MDH values were obtained during the log growth phase, and no correlation between MDH activities and mannitol production was observed in the fermentations performed. L. reuteri CRL 1101 successfully produced mannitol from sugarcane molasses being a promising candidate for microbial mannitol synthesis using low-cost substrate.

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We acknowledge the financial support of CONICET (PIP2010-0062), FONCyT (Préstamo BID PICT2008-933) and CIUNT from Argentina. M. E. Ortiz is recipient of a doctoral fellowship from CONICET, Argentina.

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Correspondence to Fernanda Mozzi.

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Maria Eugenia Ortiz and María José Fornaguera contributed equally to the article.

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Ortiz, M.E., Fornaguera, M.J., Raya, R.R. et al. Lactobacillus reuteri CRL 1101 highly produces mannitol from sugarcane molasses as carbon source. Appl Microbiol Biotechnol 95, 991–999 (2012).

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