title: Lipid extraction from microalgae cell using persulfate-based oxidation.
abstract: In this study, persulfate, a solid-type oxidant, was adopted as a substitute for hydrogen peroxide in extracting lipid from microalgae biomass. Microalgae cells were concentrated at pH 3 and with 200mg/L of ferric chloride, conditions which can activate oxidants such as hydrogen peroxide and persulfate. At a persulfate concentration of 2mM and a reaction temperature of 90°C, exceedingly high extraction efficiency over 95% was obtained, which was higher than with 0.5% hydrogen peroxide at the same temperature. This result showed that persulfate is sufficiently powerful and incomparably cheap enough to replace the potent yet expensive oxidant. It appears that combining iron-based coagulation and persulfate-based lipid extraction is indeed a competitive approach that can possibly lighten the process burden for the microalgae-derived biodiesel production.
authors.affiliation: Department of Civil and Environmental Engineering, KAIST, 373-1, Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea.
authors.forename: Yeong Hwan
authors.initials: YH
authors.lastname: Seo
authors.affiliation: Department of Civil and Environmental Engineering, KAIST, 373-1, Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea.
authors.forename: Mina
authors.initials: M
authors.lastname: Sung
authors.affiliation: Clean Fuel Department, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 305-343, Republic of Korea.
authors.forename: You-Kwan
authors.initials: YK
authors.lastname: Oh
authors.affiliation: Department of Civil and Environmental Engineering, KAIST, 373-1, Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea. Electronic address: hanj2@kaist.ac.kr.
authors.forename: Jong-In
authors.initials: JI
authors.lastname: Han
mesh_terms: D056804:Biofuels; D018533:Biomass; D005591:Chemical Fractionation / Q000379:methods*; D002708:Chlorella / Q000737:chemistry*; D002712:Chlorides / Q000737:chemistry; D005290:Ferric Compounds / Q000737:chemistry; D006861:Hydrogen Peroxide / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D008055:Lipids / Q000737:chemistry / Q000302:isolation & purification*; D058086:Microalgae / Q000737:chemistry*; D010084:Oxidation-Reduction; D017670:Sodium Compounds / Q000737:chemistry; D013431:Sulfates / Q000737:chemistry; D013696:Temperature
chemical_list: D056804:Biofuels; D002712:Chlorides; D005290:Ferric Compounds; D008055:Lipids; D017670:Sodium Compounds; D013431:Sulfates; D006861:Hydrogen Peroxide; C024625:sodium persulfate; C024555:ferric chloride
keywords: Fenton-like reaction; Lipid extraction; Microalgae; Oxidation; Persulfate