Biotransformation of citronellol by the basidiomycete Cystoderma carcharias in an aerated-membrane bioreactor.
The basidiomycete Cystoderma carcharias transformed citronellol into 3,7-dimethyl-1,6,7-octanetriol as the main product. 3,7-Dimethyl-6,7-epoxy-1-octanol was identified as important intermediary product of the biotransformation, and the allylic diols 2,6-dimethyl-2-octene-1,8-diol, 3,7-dimethyl-5-octene-1,7-diol and 3,7-dimethyl-7-octene-1,6-diol were found to be minor products. Microbial formation of rose oxide, a flavour-impact component, was observed for the first time. The formation of the main products was inhibited by 70% after addition of 0.1 mmol l-1 cytochrome monooxygenase inhibitors. Formation of 3,7-dimethyl-1,6,7-octanetriol was effective in a bioreactor with aeration over a coil of a hydrophobic microporous polypropene capillary membrane. Production rates of up to 150 mg l-1 day-1 were reached and led to a product concentration of 866 mg l-1 (conversion rate: 52%). The total loss of the added volatile substrate via the exhaust air was 4.5% when this aeration method was used.
Onken
J
J
Institut für Lebensmittelchemie, Universität Hannover, Germany.
Berger
R G
RG
D000080462:Acyclic Monoterpenes; D000363:Agaricales / Q000378:metabolism*; D019149:Bioreactors; D001711:Biotransformation; D002849:Chromatography, Gas; D008567:Membranes, Artificial; D039821:Monoterpenes; D011126:Polypropylenes; D013729:Terpenes / Q000378:metabolism*
D000080462:Acyclic Monoterpenes; D008567:Membranes, Artificial; D039821:Monoterpenes; D011126:Polypropylenes; D013729:Terpenes; C007078:citronellol