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Lignocellulose-derived inhibitors improve lipid extraction from wet Rhodococcus opacus cells.

Bioresource technology (2015-07-05)
Kazuhiko Kurosawa, C Anthony Debono, Anthony J Sinskey
ABSTRACT

Extracting lipids from oleaginous microbial cells in a cost effective and environmentally compatible manner remains a critical challenge in developing manufacturing paradigms for advanced liquid biofuels. In this study, a new approach using microbial growth inhibitors from lignocellulose-derived feedstocks was used to extract lipids efficiently from wet cell mass of the oleaginous bacterium Rhodococcus opacus MITXM-61. Nine common lignocellulose-derived inhibitors for treatment of cells prior to solvent extraction were used and evaluated for their efficiency of lipid extraction from the cells. When the inhibitors were individually examined, formic acid and furfural showed the highest extraction efficiency of lipids from wet cell mass. Multiple extractions of lipids with methanol from wet cell mass pretreated with combined common inhibitors or hardwood hydrolysate comprising lignocellulose-derived inhibitors resulted in lipid recovery of greater than 85% of total lipids, a 1.7-fold increase of lipid extraction as compared to those in the absence of the inhibitors.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Methanol, anhydrous, 99.8%
Sigma-Aldrich
Methanol, HPLC Plus, ≥99.9%, poly-coated bottles
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2-Propanol, BioReagent, for molecular biology, ≥99.5%
Sigma-Aldrich
Methanol, suitable for HPLC, gradient grade, 99.93%
Sigma-Aldrich
2-Propanol, anhydrous, 99.5%
Sigma-Aldrich
Vanillin, ReagentPlus®, 99%
Sigma-Aldrich
Isopropyl alcohol, ≥99.7%, FCC, FG
Sigma-Aldrich
Furfural, 99%
Sigma-Aldrich
5-(Hydroxymethyl)furfural, ≥99%, FG
Sigma-Aldrich
2-Propanol, BioUltra, for molecular biology, ≥99.5% (GC)
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Acetic acid, natural, ≥99.5%, FG
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5-Hydroxymethyl-2-furaldehyde, 99%
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4-Hydroxybenzaldehyde, 98%
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D-(+)-Xylose, ≥99%
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Levulinic acid, 98%
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2-Propanol, electronic grade, 99.999% trace metals basis
Sigma-Aldrich
Vanillin, ≥97%, FCC, FG
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Vanillin, natural, ≥97%, FCC, FG
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Furfural, ≥98%, FCC, FG
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D-(+)-Xylose, ≥99%
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D-(+)-Xylose, BioXtra, ≥99%
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D-(−)-Arabinose, ≥98%
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Acetic acid, ≥99.5%, FCC, FG
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Syringaldehyde, 98%
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5α-Androstan-17β-ol-3-one, ≥97.5%
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Levulinic acid, ≥97%, FG
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Formic acid, ≥95%, FCC, FG
Sigma-Aldrich
Furfural, natural, ≥98%, FCC, FG
Sigma-Aldrich
Furfural, ACS reagent, 99%
Sigma-Aldrich
D-(+)-Xylose, BioUltra, ≥99.0% (sum of enantiomers, HPLC)