title: Value-added lipid production from brown seaweed biomass by two-stage fermentation using acetic acid bacterium and thraustochytrid.
abstract: Thraustochytrid production of polyunsaturated fatty acids and xanthophylls have been generally sourced from crop-derived substrates, making the exploration of alternative feedstocks attractive since they promise increased sustainability and lower production costs. In this study, a distinct two-stage fermentation system was conceptualized for the first time, using the brown seaweed sugar mannitol as substrate for the intermediary biocatalyst Gluconobacter oxydans, an acetic acid bacterium, along with the marine thraustochytrid Aurantiochytrium sp. to produce the value-added lipids and xanthophylls. Jar fermenter culture resulted in seaweed mannitol conversion to fructose with an efficiency of 83 % by G. oxydans and, after bacteriostasis with sea salts, production of astaxanthin and docosahexaenoic acid by Aurantiochytrium sp. KH105. Astaxanthin productivity was high at 3.60 mg/L/day. This new system, therefore, widens possibilities of obtaining more varieties of industrially valuable products including foods, cosmetics, pharmaceuticals, and biofuel precursor lipids from seaweed fermentation upon the use of suitable thraustochytrid strains.
authors.affiliation: Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima, 739-8530, Japan.
authors.forename: Kim Hazel V
authors.initials: KH
authors.lastname: Arafiles
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Iwasaka
authors.forename: Yuri
authors.initials: Y
authors.lastname: Eramoto
authors.forename: Yoshiko
authors.initials: Y
authors.lastname: Okamura
authors.forename: Takahisa
authors.initials: T
authors.lastname: Tajima
authors.forename: Yukihiko
authors.initials: Y
authors.lastname: Matsumura
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Nakashimada
authors.forename: Tsunehiro
authors.initials: T
authors.lastname: Aki
mesh_terms: D019342:Acetic Acid / Q000378:metabolism*; D018533:Biomass; D019149:Bioreactors / Q000382:microbiology; D004281:Docosahexaenoic Acids / Q000302:isolation & purification / Q000378:metabolism*; D005285:Fermentation; D020600:Gluconobacter oxydans / Q000254:growth & development / Q000378:metabolism*; D050356:Lipid Metabolism; D008353:Mannitol / Q000378:metabolism*; D012624:Seaweed / Q000737:chemistry; D058009:Stramenopiles / Q000254:growth & development / Q000378:metabolism*; D024341:Xanthophylls / Q000302:isolation & purification / Q000378:metabolism
chemical_list: D024341:Xanthophylls; D004281:Docosahexaenoic Acids; D008353:Mannitol; C005948:astaxanthine; D019342:Acetic Acid