Hydrothermal processing of agar waste to levulinic acid and fermentation of hydrolysate to bioethanol
Copyright © 2023 Elsevier Ltd. All rights reserved..
Increasing global energy consumption and depleting fossil-fuel reserves prompted the search for green alternatives. This study focuses on conversion of waste agar using different acids/alkalis (0.5% and 1%) as catalysts under varied temperature and time towards galactose (Gal), 5-hydroxymethylfurfural (HMF) and levulinic acid (LA) production in sequential reactions. The optimized process for agar depolymerisation was achieved using 1% acid (H2SO4/HCl) catalysed conditions with a maximum of 11 g/L Gal yield (121 °C; 15 min). Increase in temperature (150 °C) and time (180 min) with 1% HCl/H2SO4 catalyst resulted in improved LA production along with Gal and HMF. The hydrolysis process was optimised for the selective production of LA (10 g/L at 175 °C; 180 min). Further, galactose-rich hydrolysates were assessed for bioethanol production using Saccharomyces cerevisiae that resulted in 3 g/L ethanol. Thus, the study comprehensively demonstrates waste agar utilization to yield biochemicals/fuels in a circular bio-based economy approach.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2023 |
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| Erschienen: |
2023 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:382 |
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| Enthalten in: |
Bioresource technology - 382(2023) vom: 15. Aug., Seite 129063 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Suresh, G [VerfasserIn] |
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| Links: |
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| Themen: |
9002-18-0 |
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| Anmerkungen: |
Date Completed 05.06.2023 Date Revised 05.06.2023 published: Print-Electronic Citation Status MEDLINE |
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| doi: |
10.1016/j.biortech.2023.129063 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| 520 | |a Copyright © 2023 Elsevier Ltd. All rights reserved. | ||
| 520 | |a Increasing global energy consumption and depleting fossil-fuel reserves prompted the search for green alternatives. This study focuses on conversion of waste agar using different acids/alkalis (0.5% and 1%) as catalysts under varied temperature and time towards galactose (Gal), 5-hydroxymethylfurfural (HMF) and levulinic acid (LA) production in sequential reactions. The optimized process for agar depolymerisation was achieved using 1% acid (H2SO4/HCl) catalysed conditions with a maximum of 11 g/L Gal yield (121 °C; 15 min). Increase in temperature (150 °C) and time (180 min) with 1% HCl/H2SO4 catalyst resulted in improved LA production along with Gal and HMF. The hydrolysis process was optimised for the selective production of LA (10 g/L at 175 °C; 180 min). Further, galactose-rich hydrolysates were assessed for bioethanol production using Saccharomyces cerevisiae that resulted in 3 g/L ethanol. Thus, the study comprehensively demonstrates waste agar utilization to yield biochemicals/fuels in a circular bio-based economy approach | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Biorefinery | |
| 650 | 4 | |a Platform chemicals | |
| 650 | 4 | |a Pre-treatment | |
| 650 | 4 | |a Process optimization | |
| 650 | 4 | |a Saccharification | |
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| 700 | 1 | |a Mohan, S Venkata |e verfasserin |4 aut | |
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