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Multi-product biorefinery from Arthrospira platensis biomass as feedstock for bioethanol and lactic acid production

Esquivel-Hernandez, Diego A; Pennacchio, Anna; Torres-Acosta, Mario A; Parra-Saldivar, Roberto; de Souza Vandenberghe, Luciana Porto; Faraco, Vincenza; (2021) Multi-product biorefinery from Arthrospira platensis biomass as feedstock for bioethanol and lactic acid production. Scientific Reports , 11 (1) , Article 19309. 10.1038/s41598-021-97803-5. Green open access

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Abstract

With the aim to reach the maximum recovery of bulk and specialty bioproducts while minimizing waste generation, a multi-product biorefinery for ethanol and lactic acid production from the biomass of cyanobacterium Arthrospira platensis was investigated. Therefore, the residual biomass resulting from different pretreatments consisting of supercritical fluid extraction (SF) and microwave assisted extraction with non-polar (MN) and polar solvents (MP), previously applied on A. platensis to extract bioactive metabolites, was further valorized. In particular, it was used as a substrate for fermentation with Saccharomyces cerevisiae LPB-287 and Lactobacillus acidophilus ATCC 43121 to produce bioethanol (BE) and lactic acid (LA), respectively. The maximum concentrations achieved were 3.02 ± 0.07 g/L of BE by the MN process at 120 rpm 30 °C, and 9.67 ± 0.05 g/L of LA by the SF process at 120 rpm 37 °C. An economic analysis of BE and LA production was carried out to elucidate the impact of fermentation scale, fermenter costs, production titer, fermentation time and cyanobacterial biomass production cost. The results indicated that the critical variables are fermenter scale, equipment cost, and product titer; time process was analyzed but was not critical. As scale increased, costs tended to stabilize, but also more product was generated, which causes production costs per unit of product to sharply decrease. The median value of production cost was US$ 1.27 and US$ 0.39, for BE and LA, respectively, supporting the concept of cyanobacterium biomass being used for fermentation and subsequent extraction to obtain ethanol and lactic acid as end products from A. platensis.

Type: Article
Title: Multi-product biorefinery from Arthrospira platensis biomass as feedstock for bioethanol and lactic acid production
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/s41598-021-97803-5
Publisher version: https://doi.org/10.1038/s41598-021-97803-5
Language: English
Additional information: Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Keywords: AQUEOUS 2-PHASE EXTRACTION, LIFE-CYCLE ASSESSMENT, GREEN EXTRACTION, ECONOMIC-ANALYSIS, ETHANOL-PRODUCTION, NATURAL-PRODUCTS, WASTE-WATER, LACTOBACILLUS, MICROALGAE, SPIRULINA
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Biochemical Engineering
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
URI: https://discovery.ucl.ac.uk/id/eprint/10150217
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