title: Evaluation of ethanol production and bioadsorption of heavy metals by various red seaweeds.
abstract: The objective of this study was to evaluate ethanol production and bioadsorption with four red seaweeds, Gelidium amansii, Gracilaria verrucosa, Kappaphycus alvarezii and Eucheuma denticulatum. To produce ethanol, thermal acid hydrolysis, enzymatic saccharification and fermentation was carried out. After pretreatment, 38.5, 39.9, 31.0 and 27.5 g/L of monosaccharides were obtained from G. amansii, G. verrucosa, K. alvarezii and E. denticulatum, respectively. Ethanol fermentation was performed with Saccharomyces cerevisiae KCCM 1129 adapted to 80 g/L galactose. The ethanol productions by G. amansii, G. verrucosa, K. alvarezii and E. denticulatum were 18.8 g/L with Y EtOH = 0.49, 19.1 g/L with Y EtOH = 0.48, 14.5 g/L with Y EtOH = 0.47 and 13.0 g/L with Y EtOH = 0.47, respectively. The waste seaweed slurries after the ethanol fermentation were reused to adsorb Cd(II), Pb(II) and Cu(II). Using langmuir isotherm model, Cu(II) had the highest affinity for waste seaweeds with the highest q max and electronegativity values among three heavy metals.
authors.affiliation: Department of Biotechnology, Pukyong National University, Busan, 48513, Korea.
authors.forename: In Yung
authors.initials: IY
authors.lastname: Sunwoo
authors.affiliation: Department of Biotechnology, Pukyong National University, Busan, 48513, Korea.
authors.forename: Chae Hun
authors.initials: CH
authors.lastname: Ra
authors.affiliation: Department of Biotechnology, Pukyong National University, Busan, 48513, Korea.
authors.forename: Gwi-Taek
authors.initials: GT
authors.lastname: Jeong
authors.affiliation: Department of Biotechnology, Pukyong National University, Busan, 48513, Korea. skkim@pknu.ac.kr.
authors.forename: Sung-Koo
authors.initials: SK
authors.lastname: Kim
mesh_terms: D000327:Adsorption; D000431:Ethanol / Q000378:metabolism*; D005285:Fermentation; D019216:Metals, Heavy / Q000378:metabolism*; D012624:Seaweed / Q000378:metabolism*
chemical_list: D019216:Metals, Heavy; D000431:Ethanol
keywords: Adaptation; Bioadsorption; Bioethanol; Red seaweeds