Xylose-fermenting yeast mutants

Chemistry: molecular biology and microbiology – Micro-organism – per se ; compositions thereof; proces of... – Fungi

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435161, 435171, 4351721, 435921, 435938, C12P 706, C12N 1501, C12N 116

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051262665

ABSTRACT:
A growth medium is provided for mutant mixtures of Pichia stipitis or Candida shehatae that permits the growth of mutants which are the best xylose-to-ethanol fermenters in the mixture while inhibiting the growth of inefficient fermenters. The medium comprises a mixture of two compounds, the first compound selected from the group consisting of L-xylose, L-arabinose, D-arabinose, glycerol, erythritol, erythrose, 5- and 6-carbon polyols such as xylitol, L-arabinitol, D-arabinitol and mannitol, and wherein the second compound is ammonium tartarate or an inorganic nitrogen source compound such as ammonium chloride or ammonium sulfate.

REFERENCES:
patent: 4347317 (1982-08-01), Yoshimura et al.
patent: 4701414 (1987-10-01), van Dijken et al.
Jeffries Enz. Microb. Technol. 1984, vol. 6, Jun. (254-258) Mutants of Pachysolen tannophilus showing enhanced rates of growth and ethanol formation from D-xylose.
Difco Manual, 9th Edition, Detroit Michigan pp. 47-48 BAGG Broth.

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