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Production of arabitol from enzymatic hydrolysate of soybean flour by Debaryomyces hansenii fermentation

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Abstract

Arabitol is a low-calorie sugar alcohol with anti-cariogenic properties. Enzymatic hydrolysate of soybean flour is a new renewable biorefinery feedstock containing hexose, pentose, and organic nitrogen sources. Arabitol production by Debaryomyces hansenii using soybean flour hydrolysate was investigated. Effects of medium composition, operating conditions, and culture stage (growing or stationary phase) were studied. Production was also compared at different culture volumes to understand the effect of dissolved oxygen concentration (DO). Main factors examined for medium composition effects were the carbon to nitrogen concentration ratio (C/N), inorganic (ammonium) to organic nitrogen ratio (I/O-N), and sugar composition. Arabitol yield increased with increasing C/N ratio and a high I/O-N (0.8–1.0), suggesting higher yield at stationary phase of low pH (3.5–4.5). Catabolite repression was observed, with the following order of consumption: glucose > fructose > galactose > xylose > arabinose. Arabitol production also favored hexoses and, among hexoses, glucose. DO condition was of critical importance to arabitol production and cell metabolism. The yeast consumed pentoses (xylose and arabinose) only at more favorable DO conditions. Finally, arabitol was produced in fermentors using mixed hydrolysates of soy flour and hulls. The process gave an arabitol yield of 54%, volumetric productivity of 0.90 g/L-h, and specific productivity of 0.031 g/g-h.

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Funding

The funding support for this study was provided by research grants from the United Soybean Board (Projects 1475, 2475, and 5256).

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Correspondence to Lu-Kwang Ju.

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The authors declare that they have no conflict of interest.

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The article does not contain any studies with human participants or animals by any of the authors.

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Loman, A.A., Islam, S.M.M. & Ju, LK. Production of arabitol from enzymatic hydrolysate of soybean flour by Debaryomyces hansenii fermentation. Appl Microbiol Biotechnol 102, 641–653 (2018). https://doi.org/10.1007/s00253-017-8626-5

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  • DOI: https://doi.org/10.1007/s00253-017-8626-5

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