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- Title
Biotechnological conversion of spent coffee grounds into lactic acid.
- Authors
Hudeckova, H.; Neureiter, M.; Obruca, S.; Frühauf, S.; Marova, I.
- Abstract
Abstract: This work investigates the potential bioconversion of spent coffee grounds (SCG) into lactic acid (LA). SCG were hydrolysed by a combination of dilute acid treatment and subsequent application of cellulase. The SCG hydrolysate contained a considerable amount of reducing sugars (9·02 ± 0·03 g l−1, glucose; 26·49 ± 0·10 g l−1 galactose and 2·81 ± 0·07 g l−1 arabinose) and it was used as a substrate for culturing several lactic acid bacteria (LAB) and LA‐producing <italic>Bacillus coagulans</italic>. Among the screened micro‐organisms, <italic>Lactobacillus rhamnosus </italic>CCM 1825 was identified as the most promising producer of LA on a SCG hydrolysate. Despite the inhibitory effect exerted by furfural and phenolic compounds in the medium, reasonably high LA concentrations (25·69 ± 1·45 g l−1) and yields (98%) were gained. Therefore, it could be demonstrated that SCG is a promising raw material for the production of LA and could serve as a feedstock for the sustainable large‐scale production of LA. Significance and Impact of the Study: Spent coffee grounds (SCG) represent solid waste generated in millions of tonnes by coffee‐processing industries. Their disposal represents a serious environmental problem; however, SCG could be valorized within a biorefinery concept yielding various valuable products. Herein, we suggest that SCG can be used as a complex carbon source for the lactic acid production.
- Subjects
BIOCONVERSION; CELLULASE; LACTIC acid biotechnology; FERMENTATION; POLYLACTIC acid; COFFEE industry
- Publication
Letters in Applied Microbiology, 2018, Vol 66, Issue 4, p306
- ISSN
0266-8254
- Publication type
Article
- DOI
10.1111/lam.12849