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Compositional shifts in lipid fractions during lipid turnover in Cunninghamella echinulata

Paper ID Volume ID Publish Year Pages File Format Full-Text
18181 42713 2007 7 PDF Available
Title
Compositional shifts in lipid fractions during lipid turnover in Cunninghamella echinulata
Abstract

The oleaginous fungus Cunninghamella echinulata when cultivated on a tomato waste hydrolysate medium accumulated 7.8 g l−1 of reserve lipid, while, after the exhaustion of the carbon source in the growth environment, 44% of this lipid was consumed and 3.2 g l−1 of lipid-free biomass were synthesized. It was demonstrated that lipid fractions and individual lipid classes varied in amount, relative proportions and fatty acid profile during the turnover phase. Triacylglycerols (TAG) were preferentially consumed as their percentage proportion decreased from 26.6 to 6.9% (w/w) of lipid-free biomass, while TAG structures containing more unsaturated fatty acids were partially discriminated. Consequently, the relative proportion of γ-linolenic acid (GLA) increased in TAG from 9.2% (end of the lipogenic phase) to 15.3% (w/w), whereas C16:0 decreased from 22.7 to 15.6% (w/w). Concomitantly membrane polar lipid fractions were synthesized during lipid turnover. During the transition, glycolipids plus sphingolipids fraction was enriched in polyunsaturated fatty acids, especially in GLA, while phospholipids fraction was enriched in GLA but not in C18:2.

Keywords
DAG, diacylglycerol; FA, fatty acid; FASF, fatty acid specific fluctuation (parameter used in the paper); FFAs, free fatty acids; G + S, glycolipids plus sphingolipids; GC, gas chromatography; GLA, γ-linolenic acid; MAG, monoacylglycerol; NL, neutral lipi
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Compositional shifts in lipid fractions during lipid turnover in Cunninghamella echinulata
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Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 40, Issue 5, 3 April 2007, Pages 1321–1327
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Price was $35.95
You save - $31
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