Strategy for biological co-production of levulinic acid and polyhydroxyalkanoates by using mixed microbial cultures fed with synthetic hemicellulose hydrolysate

• Published in: Bioresource technology Vol. 309; p. 123323
• Main Authors: Pinto-Ibieta, F., Cea, M., Cabrera, F., Abanto, M., Felissia, F.E., Area, M.C., Ciudad, G.
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01-08-2020
• Subjects: Bioreactors; Hemicellulose hydrolysate; Levulinic acid biological production; Levulinic Acids; Mixed microbial cultures; Polyhydroxyalkanoates; Polyhydroxyalkanoates and levulinic acid co-production; Polysaccharides; Levulinic acid biological production; Mixed microbial cultures; Polyhydroxyalkanoates and levulinic acid co-production; Hemicellulose hydrolysate
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2020.123323

•SHH was used as substrate for LA and PHA production.•LA and PHA-producing microorganisms were selected using a SBR feed with SHH.•Co-production of LA and PHA was possible using synthetic HH enriched with acetate.•Levulinic acid production reached 37% w/w.
Hemicellulose hydrolysates (HH), which could be an interesting carbon source to feed mixed microbial cultures (MMC) able to accumulate high value-added compounds. This research focused on the evaluation of a culture strategy to achieve the simultaneous biological production of Levulinic Acid (LA) and Polyhydroxyalcanoates (PHA) by MMC fed with a synthetic HH (SHH). The culture strategy involves the use of sequential batch reactors (SBR) to select microorganisms capable of producing LA and PHA. This work proved that the cultivation strategy used allowed the biological production of LA, reaching 37%w/w when the SHH was composed of 85% pentoses. In addition, the simultaneous biological production of LA and PHB was possible when the SHH was enriched with acetate (45% pentoses − 50% acetate). Finally, this study showed that the composition of the SHH impacts directly on the selected microorganism genus and the type and quantity of the value-added compounds obtained.