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Abstract
Lactic acid, traditionally obtained through fermentation processes, presents numerous applications in the chemical industry. Among these is the production of polymers, more specifically biodegradable polylactic acid (PLA). Development of processes that use low cost substrates, such as bioproduction of lactic acid, could improve the economic viability of bioprocesses. Thus, the present work reports investigation of hemicellulose hydrolysate from sugarcane bagasse as a sole carbon source for lactic acid production by Lactobacillus pentosus ATCC 8041. Initially, sugarcane bagasse was pretreated with acid in a solid:liquid ratio of 1:2.8 (1 g of bagasse: 2.8 mL of sulfuric acid solution 1 % v/v) and at a temperature of 121°C for 27 minutes. Then, concentration of both the hemicellulose hydrolysate and the yeast extract in MRS medium were optimized usingResponse Surface Methodology through software STATISTICA 6.0. Once the optimal conditions (40 % of hemicellulose hydrolysate and 5 g/L of yeast extract) were validated, fermentations were carried out in anaerobic conditions at 37°C and 120 rpm. After 48h, 19.17 g/L of lactic acid were produced, corresponding to a volumetric productivity of 0.40 g/L.h1. Findings of this work demonstrate that hemicellulose hydrolysate from sugarcane bagasse is a promising carbon source for lactic acid production.
Highlights
Lignocellulosic materials are a natural and renewable source of feedstock that can be used for production of more value-added products
When lignocellulosic materials undergo through acid pretreatment, which uses dilute acid, a fraction rich in xylose, named hemicellulose hydrolysate (HH), is obtained
Despite being a monosaccharide, xylose fermentation is more difficult when compared to glucose’s, since fewer microorganisms have the ability to assimilate it. Another obstacle concerning use of hemicellulose hydrolysate is related to the presence of metabolic inhibitors, such as furfural, 5-hydroxymethylfurfural (HMF) and acetic acid, which are formed during pretreatment (Deshavath et al, 2017; Kumar, Barrett, Delwiche, & Stroeve, 2009; Gonzales, Sivagurunathan, & Kim, 2016) use of HH, and its further conversion to value-added products, is the objective of many researches in the area
Summary
Lignocellulosic materials are a natural and renewable source of feedstock that can be used for production of more value-added products. Despite being a monosaccharide, xylose fermentation is more difficult when compared to glucose’s, since fewer microorganisms have the ability to assimilate it Another obstacle concerning use of hemicellulose hydrolysate is related to the presence of metabolic inhibitors, such as furfural, 5-hydroxymethylfurfural (HMF) and acetic acid, which are formed during pretreatment (Deshavath et al, 2017; Kumar, Barrett, Delwiche, & Stroeve, 2009; Gonzales, Sivagurunathan, & Kim, 2016) use of HH, and its further conversion to value-added products, is the objective of many researches in the area. This should represent USD 9.8 billion in the global market (De Oliveira, Komesu, Rossell & Maciel Filho, 2018). The present work reports the investigation of hemicellulose hydrolysate from sugarcane bagasse as the sole carbon source for lactic acid production by Lactobacillus pentosus ATCC 8041
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