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The effect of maltose on dextran yield and molecular weight distribution

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Abstract

Dextran synthesis has been studied since the Second World War, when it was used as blood plasma expander. This polysaccharide composed of glucose units is linked by an α-1,6-glucosidic bond. Dextransucrase is a bacterial extra cellular enzyme, which promotes the dextran synthesis from sucrose. When, besides sucrose, another substrate (acceptor) is also present in the reactor, oligosaccharides are produced and part of the glucosyl moieties from glucose is consumed to form these acceptor products, decreasing the dextran yield. Although dextran enzymatic synthesis has been extensively studied, there are few published studies regarding its molecular weight distribution. In this work, the effect of maltose on yield and dextran molecular weight synthesized using dextransucrase from Leuconostoc mesenteroides B512F, was investigated. According to the obtained results, maltose is not able to control and reduce dextran molecular weight distribution and synthesis carried out with or without maltose presented the same molecular weight distribution profile.

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Abbreviations

D :

Dextran mass (moles of polymerised glucose)

DXT:

Dextran

\(\overline{{M{\rm w}}}\) :

Weight average molecular weight (g/mol)

\(\overline{{M{\rm n}}}\) :

Weight average molecular weight (g/mol)

\(\overline{{M{\rm p}}}\) :

Peak average molecular weight (g/mol)

S 0 :

Initial sucrose concentration (mM)

PDI:

Polydispersity index

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Acknowledgements

The authors acknowledge the Brazilian funding agencies CNPq, CAPES and FAEP for the financial support and to ARS Culture Bacterial Collection for the Leuconostoc mesenteroides strain used in this work.

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Authors and Affiliations

  1. Departamento de Tecnologia de Alimentos, Universidade Federal do Ceará, Caixa Postal 12168, Campus do Pici, Bloco 858, 60021-970, Fortaleza, CE, Brazil

    Sueli Rodrigues

  2. Departamento de Processos Químicos, Universidade Estadual de Campinas, Faculdade de Engenharia Química, Caixa Postal 6066, 13083-970, Campinas, SP, Brazil

    Liliane M. F. Lona & Telma T. Franco

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  1. Sueli Rodrigues
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  3. Telma T. Franco
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Correspondence to Sueli Rodrigues.

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Rodrigues, S., Lona, L.M.F. & Franco, T.T. The effect of maltose on dextran yield and molecular weight distribution. Bioprocess Biosyst Eng 28, 9–14 (2005). https://doi.org/10.1007/s00449-005-0002-7

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  • DOI: https://doi.org/10.1007/s00449-005-0002-7

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