title: A facile reactor process for producing 7,10-dihydroxy-8(E)-octadecenoic acid from oleic acid conversion by Pseudomonas aeruginosa.
abstract: Pseudomonas aeruginosa strain PR3 (NRRL B-18602) converts oleic acid to a novel compound, 7,10-dihydroxy-8(E)-octadecenoic acid (DOD). The bioconversion was scaled up in a 7-l bench-top, stirred-batch reactor to produce DOD for testing of potential industrial uses. Aeration was supplied continuously from the top through two ports on the headplate and periodically through a bottom sparger, in conjunction with the use of marine impellers for agitation. This unique aeration arrangement maintained the dissolved O2 concentration in the 40-60% range during the period of maximal bioconversion and it also avoided excessive medium foaming during the reaction. Furthermore, the level of dissolved O2 in the first 24 h of reaction played an important role in the initial rate of DOD production. DOD production reached a plateau after 72 h with a yield up to 100 g (or 50% recovery) from a total of 9 l medium from two reactors run simultaneously. The final culture broth was processed using newly adapted procedures in the pilot plant that included crystallization of DOD from ethyl acetate solution at -15 degrees C. The newly developed bioprocess will serve as a platform for the scale-up production of other value-added products derived from vegetable oils and their component fatty acids.
authors.affiliation: Microbial Genomics and Bioprocessing Research Unit, National Center for Agricultural Utilization Research, USDA-ARS, Peoria, IL 61604, USA. kuotm@ncaur.usda.gov
authors.forename: Tsung Min
authors.initials: TM
authors.lastname: Kuo
authors.forename: Karen J
authors.initials: KJ
authors.lastname: Ray
authors.forename: Linda K
authors.initials: LK
authors.lastname: Manthey
mesh_terms: D019149:Bioreactors / Q000382:microbiology*; D001711:Biotransformation; D019301:Oleic Acid / Q000378:metabolism*; D009829:Oleic Acids / Q000096:biosynthesis*; D010100:Oxygen / Q000378:metabolism*; D010865:Pilot Projects; D011550:Pseudomonas aeruginosa / Q000145:classification / Q000378:metabolism*; D011786:Quality Control; D013045:Species Specificity
chemical_list: C477043:7,10-dihydroxy-8-octadecenoic acid; D009829:Oleic Acids; D019301:Oleic Acid; D010100:Oxygen