From the culture broth to the erythritol crystals: an opportunity for circular economy

The reduction of sugar intake by adults has been stated by the World Health Organization as an important strategy to reduce the risk of non-communicable diseases. Erythritol is a four-carbon sugar alcohol that is considered as a highly suitable substitution for sucrose. This review article covers ap...

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Bibliographic Details
Published in:Applied microbiology and biotechnology 2021-06, Vol.105 (11), p.4467-4486
Main Authors: Daza-Serna, Laura, Serna-Loaiza, Sebastián, Masi, Audrey, Mach, Robert Ludwig, Mach-Aigner, Astrid Rosa, Friedl, Anton
Format: Article
Language:English
Subjects:
Batch culture
Biomedical and Life Sciences
Biotechnology
Cell culture
Centrifugation
Chemical synthesis
Chromatography
Circular economy
Composition
Critical point
Crystallization
Crystals
Cultivation
Drying
Economics
Erythritol
Life Sciences
Membrane separation
Methods
Microbial Genetics and Genomics
Microbiology
Microorganisms
Mini-Review
Nutrients
Production processes
Separation
Substitutes
Substrates
Sucrose
Sugar
Waste management
Waste streams
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Summary:The reduction of sugar intake by adults has been stated by the World Health Organization as an important strategy to reduce the risk of non-communicable diseases. Erythritol is a four-carbon sugar alcohol that is considered as a highly suitable substitution for sucrose. This review article covers approaches for the separate stages of the biotechnological production of erythritol from cultivation to the downstream section. The first part focuses on the cultivation stage and compares the yields of erythritol and arising by-products achieved with different types of substrates (commercial versus alternative ones). The reported numbers obtained with the most prominently used microorganisms in different cultivation methods (batch, fed-batch or continuous) are presented. The second part focuses on the downstream section and covers the applied technologies for cell removal, recovery, purification and concentration of erythritol crystals, namely centrifugation, membrane separation, ion and preparative chromatography, crystallization and drying. The final composition of the culture broth and the preparative chromatography separation performance were identified as critical points in the production of a high-purity erythritol fraction with a minimum amount of losses. During the review, the challenges for a biotechnological production of erythritol in a circular economy context are discussed, in particular regarding the usage of sustainable resources and minimizing waste streams. Key points • Substitution of sucrose by erythritol can be a step towards a healthier society • Biotechnological production of erythritol should follow a circular economy concept • Culture broth composition and preparative chromatography are keys for downstreaming • Substrate, mother liquor and nutrients are challenges for circular economy
ISSN:0175-7598
1432-0614
DOI:10.1007/s00253-021-11355-2