IntroductionLactic acid (LA) is valuable substance widely used in food, pharmaceutical, cosmetic and chemical industries. One of the main applications of LA is as a monomer for the production of the biodegradable polymer polylactic acid, which represents a promising alternative to traditional petroleum‐based plastics (Abdel‐Rahman and Sonomoto ). Industrial LA production is predominantly performed by microbial fermentation (Lu et al. ); nevertheless, high substrate costs remain a major economic factor for the large‐scale production of LA. Moreover, widely used refined sugars and starch compete with food resources and feed supply. Hence, alternative inexpensive substrates such as lignocellulosic biomass are recommended for the reasonable and sustainable process of LA production (Kuo et al. ). However, utilization of these complex materials usually requires pretreatment and hydrolysis prior to fermentation (Jönsson and Martín ).Spent coffee grounds (SCG) are solid residues generated during the preparation of coffee beverage or the manufacturing of instant coffee. On an average, about 650 kg of SCG is produced by manufacturing from one tonne of green coffee (Mussatto et al. ). The SCG consists mainly of hemicelluloses (30–40 wt.%), particularly mannans, galactans and arabinans. The cellulose content is about 10 wt.%. Other substances present in SCG are lignin (approx. 30 wt.%) and
Letters in Applied Microbiology – Wiley
Published: Jan 1, 2018
Keywords: ; ; ; ; ; ;
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