Cogongrass (Imperata cylindrica) Leaf Extract Counteracts the Effects of Nitrogen Limitation and Induces Changes in Biomass, Lipid, and Fatty Acid Profile in Chlorella vulgaris UMT-M1 and Scenedesmus sp. KS-2

This study assessed the feasibility of unhydrolyzed cogongrass as a medium fortificant for cultivation of Chlorella vulgaris UMT-M1 and Scenedesmus sp. KS-2. Nitrogen-limited media supplemented with 0.1–0.5% ( w / v ) cogongrass leaf extract induced changes in lipid content and produced effects that...

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Published in:Bioenergy research 2021-03, Vol.14 (1), p.61-69
Main Authors: Loh, Saw Hong, Yee, Willy, Lee, Sheryl Wan Yi, Tan, Ya Ting, Phua, Pamela Szu Phin, Cha, Thye San
Format: Article
Language:English
Subjects:
Algae
Analysis
Biodiesel fuels
Biofuels
Biomass
Biomedical and Life Sciences
Chlorella
Chlorella vulgaris
Cultivation
Depletion
Fatty acid composition
Fatty acids
Feasibility studies
Imperata cylindrica
Leaves
Life Sciences
Lipids
Medicine, Botanic
Medicine, Herbal
Microalgae
Nitrogen
Oleic acid
Palmitic acid
Plant biomass
Plant Breeding/Biotechnology
Plant Ecology
Plant extracts
Plant Genetics and Genomics
Plant Sciences
Polyunsaturated fatty acids
Saturated fatty acids
Scenedesmus
Unsaturated fatty acids
Wood Science & Technology
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description This study assessed the feasibility of unhydrolyzed cogongrass as a medium fortificant for cultivation of Chlorella vulgaris UMT-M1 and Scenedesmus sp. KS-2. Nitrogen-limited media supplemented with 0.1–0.5% ( w / v ) cogongrass leaf extract induced changes in lipid content and produced effects that appear to counteract the effects of nitrogen depletion, restoring lipid and fatty acid content to levels similar to nitrogen-replete media while biomass was decreased. While nitrogen-limited media led to an increase in total lipid, oleic acid (C18:1) and monounsaturated fatty acid (MUFA) content and a decrease in palmitic acid (C16:0), polyunsaturated fatty acid (PUFA) and saturated fatty acid (SFA) content, the presence of cogongrass extract evidently cancelled this effect. As a sole ingredient, cogongrass reduced biomass, C16:0, PUFA and SFA, but increased total oil, C18:1 and MUFA to levels similar to N-limited media. Unexpectedly, a 45.8% increase in lipid productivity in Scenedesmus sp. under N-limitation was observed, despite a reduction in biomass. This study demonstrates that the extract from cogongrass and likely from other plant sources could potentially be used as a medium fortificant for microalga cultivation for lipid production. It could also be used as part of a cultivation strategy towards the production of desired fatty acid composition for biodiesel applications. In addition, this study could spark new research for alternative medium fortificants for microalga cultivation from various unutilized or waste plant biomass resources.
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KS-2</atitle><jtitle>Bioenergy research</jtitle><stitle>Bioenerg. Res</stitle><date>2021-03-01</date><risdate>2021</risdate><volume>14</volume><issue>1</issue><spage>61</spage><epage>69</epage><pages>61-69</pages><issn>1939-1234</issn><eissn>1939-1242</eissn><abstract>This study assessed the feasibility of unhydrolyzed cogongrass as a medium fortificant for cultivation of Chlorella vulgaris UMT-M1 and Scenedesmus sp. KS-2. Nitrogen-limited media supplemented with 0.1–0.5% ( w / v ) cogongrass leaf extract induced changes in lipid content and produced effects that appear to counteract the effects of nitrogen depletion, restoring lipid and fatty acid content to levels similar to nitrogen-replete media while biomass was decreased. 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subjects Algae
Analysis
Biodiesel fuels
Biofuels
Biomass
Biomedical and Life Sciences
Chlorella
Chlorella vulgaris
Cultivation
Depletion
Fatty acid composition
Fatty acids
Feasibility studies
Imperata cylindrica
Leaves
Life Sciences
Lipids
Medicine, Botanic
Medicine, Herbal
Microalgae
Nitrogen
Oleic acid
Palmitic acid
Plant biomass
Plant Breeding/Biotechnology
Plant Ecology
Plant extracts
Plant Genetics and Genomics
Plant Sciences
Polyunsaturated fatty acids
Saturated fatty acids
Scenedesmus
Unsaturated fatty acids
Wood Science & Technology
title Cogongrass (Imperata cylindrica) Leaf Extract Counteracts the Effects of Nitrogen Limitation and Induces Changes in Biomass, Lipid, and Fatty Acid Profile in Chlorella vulgaris UMT-M1 and Scenedesmus sp. KS-2
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