Ideal conditions of microwave-assisted acid pretreatment of sugarcane straw allow fermentative butyric acid production without detoxification step

•Waste sugarcane straw is a suitable feedstock for fermentation after pretreatment.•Microwave pretreatment leads to hydrolysates with low inhibitors concentrations.•Ideal pretreatment conditions are 162 °C and 0.6% sulfuric acid (w/v) for 2 min.•The pretreatment conditions spare acid, time, and the...

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Bibliographic Details
Published in:Bioresource technology 2021-06, Vol.329, p.124929-124929, Article 124929
Main Authors: Fonseca, Bruna Constante, Reginatto, Valeria, López-Linares, Juan Carlos, Lucas, Susana, García-Cubero, M. Teresa, Coca, Mónica
Format: Article
Language:English
Subjects:
Box-Behnken design
Butyric Acid
Clostridium beijerinckii
Fermentation
Hydrolysis
Microwave pretreatment
Microwaves
Saccharum
Sugarcane processing
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Summary:•Waste sugarcane straw is a suitable feedstock for fermentation after pretreatment.•Microwave pretreatment leads to hydrolysates with low inhibitors concentrations.•Ideal pretreatment conditions are 162 °C and 0.6% sulfuric acid (w/v) for 2 min.•The pretreatment conditions spare acid, time, and the detoxification stage.•Hydrolysate fermentation by strain Br21 provided high butyric acid yield. Sugarcane straw (SCS) was pretreated with dilute sulfuric acid assisted by microwave to magnify fermentable sugars and to minimize the concentration of inhibitors in the hydrolysates. The optimum conditions for maximum recovery of sugars were 162 °C and 0.6% (w/v) H2SO4. The low level of inhibitors, such as acetate (2.9 g/L) and total phenolics (1.4 g/L), in the SCS slurry from the pretreatment stage allowed the enzymatic hydrolysis and fermentation steps to occur without detoxification. Besides consuming the total sugar content (31.0 g/L), Clostridium beijerinckii Br21 was able to use acetate from the SCS hydrolysate, to give butyric acid at high conversion factor (0.49 g of butyric acid /g of sugar). The optimized pretreatment conditions spared acid, time, and the detoxification stage, making bio-butyric acid production from SCS extremely attractive.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2021.124929