Xyrofin Oy

Forskarpatent I Syd Ab

Scandinavian Technology Group Ab

Barbel Hahn-Hagerdal

Merja Elisa Penttila

Eckhard Boles

Ulla Airaksinen

Heikki Ojamo

Sirkka Keranen

Beate Wiedemann

Mats Walfridsson

Johan Hallborn

Kaisa Karhumaa

Marie-Francoise Gorwa-Grauslund

Jordi Planas

Folke Tjerneld

Astrain expressing both arabinose and xylose utilization pathways, and in particular to astrain fermenting both arabinose and xylose to ethanol, and more particularly astrain with overexpression or upregulation of xylose- or aldose reductase (XR, AR) with xylitol dehydrogenase (XDH) together with overexpression or upregulation of genes forming an arabinose utilization pathway. The invention encompasses both laboratory and industrial strain having these properties.

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The invention provides novel polymer conjugates that are especially useful in the separation of carboxylic acids from complex fermentation compositions. The polymer conjugates comprise polyethylene glycols or oxides and polyethyleneimine or polypropyleneimine in various ratios. The novel polymer conjugates permit enhanced extraction of carboxylic acids from fermentation systems not only through their use in partitioning the carboxylic acids from various polymeric components of the fermentation system, but also through their use in adjusting the pH of the system for optimal performance and separation.

Polymer conjugates of polyethylene glycols or oxides with

This invention relates to recombinant-DNA-technology. Specifically, this invention relates to new recombinant yeast strains transformed with xylose reductase and/or xylitol dehydrogenase enzyme genes. A yeast strain transformed with the xylose reductase gene is capable of reducing xylose to xylitol and consequently of producing xylitol in vivo. If both of these genes are transformed into a yeast strain, the resultant strain is capable of producing ethanol on xylose containing medium during fermentation. Further, the said new yeast strains are capable of expressing the said two enzymes. Xylose reductase produced by these strains can be used in an enzymatic process for the production of xylitol in vitro.

Xylose utilization by recombinant yeasts

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Lund, Sweden

Barbel Hahn-Hagerdal