TECHNOLOGY FOCUS - BIOLOGY - Preferred Components: The cell is a bacterium including Escherichia, Anabaena, Caulobacter, Gluconobacter, Rhodobacter, Pseudomonas, Paracoccus, Bacillus, Brevibacterium, Corynebacterium, Rhizobium, Flavobacterium, Klebsiella, Enterobacter, Lactobacillus, Lactococcus, Methylobacterium, Staphylococcus or Streptomyces, preferably Bacillus subtilis, Bacillus amyloliquefaciens, Bacillus licheniformis, Bacillus lentus, Bacillus megaterium, Bacillus halodurans, Bacillus pumilus, Gluconobacter oxydans, Caulobacter crescentus CB, Methylobacterium extorquens, Rhodobacter sphaeroides, Pseudomonas putida, Paracoccus zeaxanthinifaciens, Paracoccus denitrificans, Escherichia coli, Corynebacterium glutamicum, Staphylococcus carnosus, Streptomyces lividans, Sinorhizobium meliloti or Rhizobium radiobacter. The cell is yeast cell including Candida, Hansenula, Kluyveromyces, Pichia, Saccharomyces, Schizosaccharomyces or Yarrowia, preferably Kluyveromyces lactis, Saccharomyces cerevisiae, Hansenula polymorpha, Yarrowia lipolytica or Pichia pastoris. The filamentous fungal cell includes Aspergillus, Chrysosporium, Penicillium, Talaromyces or Trichoderma, preferably A. niger, A. awamori, A. foetidus, A. sojae, A. fumigatus, Talaromyces emersonii, A. oryzae, Chrysosporium lucknowense, Trichoderma reesei or Penicillium chrysogenum. The oxidoreductase catalyst is a cell free extract or a whole cell biocatalyst, of the cell.    TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preparation (Claimed): Preparation of the polypeptide having oxidoreductase activity comprises cultivating the cell under conditions which allow for expression of the polypeptide and, optionally, recovering the expressed polypeptide.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The furanic precursor of FDCA is 5-hydroxymethylfurfural (HMF) (preferred), 2,5-dihydroxymethyl furan (HMF alcohol) or HMF acid, where HMF is obtained from at least one hexose sugar by heating in the presence of acid and the hexose sugar is obtained from biomass. The furanic precursor of HMF acid is HMF or HMF alcohol. The coenzyme is nicotinamide adenine dinucleotide and/or pyrroloquinoline quinone and/or flavin adenine dinucleotide. EXAMPLE - No suitable example given.