Dilute Acid Hydrolysis of Sweet Sorghum Bagasse and Fermentability of the Hemicellulosic Hydrolysate

Camargo, D.; Sydney, Eduardo Bittencourt; Leonel, Lillian Vieira; Pintro, Tania Claudia; Sene, Luciane

doi:10.1590/0104-6632.20190361s20170643

Cited by 16 publications

(8 citation statements)

References 56 publications

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“…Activated charcoal treatment is a commonly used detoxification method. The excellent capacity of activated charcoal treatment for the removal of furans and phenols was reported in the detoxification of olive tree biomass [19], sweet sorghum bagasse [29], palm press fiber [30], Agave lechuguilla [31], and brewers' spent grain [32].…”

Section: Composition and Detoxification Of Eop Hydrolysatementioning

confidence: 97%

Production of Ethanol from Hemicellulosic Sugars of Exhausted Olive Pomace by Escherichia coli

et al. 2020

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Exhausted olive pomace (EOP) is the main residue generated in olive oil industries, after the extraction of the residual oil from olive pomace with hexane. This work studies the ethanol production from hemicellulosic sugars of EOP. The fermentability of the sugar solution, resulting from the acid pretreatment of EOP, was evaluated using Escherichia coli SL100, although a detoxification step was required before fermentation. Overliming and activated charcoal detoxification were tested to minimize the presence of inhibitory compounds in the hydrolysate and to achieve a fermentable medium. E. coli assimilated all sugars in both detoxified hydrolysates and achieved ethanol yields of about 90% of the theoretical one. However, the fermentation time was much shorter when the hydrolysate had been detoxified with activated charcoal (20 h versus 120 h).

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Section: Composition and Detoxification Of Eop Hydrolysatementioning

confidence: 97%

Production of Ethanol from Hemicellulosic Sugars of Exhausted Olive Pomace by Escherichia coli

et al. 2020

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“…On the contrary, acetic acid is only reduced on a very low level (only 4%), as activated charcoal detoxification is able to effectively reduce inhibitors, such as HMF, furfural, formic acid, and phenols, but there is not much evidence that this method is effective for acetic acid reduction [22]. Substantial furan and phenolic compound reductions by activated charcoal detoxification were also achieved from hydrolysates of the brewery's spent grain [23], sweet sorghum bagasse [24], olive tree pruning biomass [25], and corn pericarp [26].…”

Section: Eop Hydrolysate Composition and Detoxificationmentioning

confidence: 99%

Xylitol Production from Exhausted Olive Pomace by Candida boidinii

et al. 2020

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In this work, the production of xylitol from a hemicellulosic hydrolysate of exhausted olive pomace (EOP), a residue originated in the olive oil production process by Candida boidinii, was assessed. The hydrolysate was obtained by dilute acid pretreatment of EOP at 170 °C and 2% H2SO4 (w/v). A previous detoxification step of the hydrolysate was necessary, and its treatment with activated charcoal and ion-exchange resin was evaluated. Prior to fermentation of the hydrolysate, fermentation tests in synthetic media were performed to determine the maximum xylitol yield and productivity that could be obtained if inhibitory compounds were not present in the medium. In addition, the glucose existing in the media exerted a negative influence on xylitol production. A maximum xylitol yield of 0.52 g/g could be achieved in absence of inhibitor compounds. Fermentation of the hemicellulosic hydrolysate from EOP after detoxification with ion-exchange resin resulted in a xylitol yield of 0.43 g/g.

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“…There is a direct correlation between the severity of a pretreatment process and the amount of by-products that are generated, which suggests a preference for lower severity pretreatments [21][22][23]. On the other hand, the severity of the pretreatment process is correlated to the sugar recoveries [20].…”

Section: Introductionmentioning

confidence: 99%

“…The conversion of lignocellulose-derived sugar into by-products not only decreases the yield of desired products, but also inhibits processing of pretreated materials through enzymatic hydrolysis and microbial bioconversion, by lowering the performance of the yeast or bacterial strains that convert these sugars to fuels and chemicals [24]. Acetic acid is not a degradation product as such but originates from the cleavage of the acetyl group in hemicellulose: however, acetic acid is also capable of inhibiting cell growth and productivity [21,22].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, by-product formation from pretreatment can be limited by optimising the pretreatment conditions, while still achieving acceptable sugar yields, either as individual sugars such as xylose or glucose, or a combination thereof, from the combined pretreatment-hydrolysis process [23]. Monosaccharides liberated during the pretreatment process may participate in the degradation reactions [21,22], where xylose, the main product of hemicellulose hydrolysis, dehydrates into furfural. Cellulose, on the other hand, which is less susceptible to chemical hydrolysis, can be converted to 5hydroxymethylfurfural (5-HMF) during pretreatment, once glucose becomes available, rendering it unsuitable for downstream biochemical processes [21,22].…”

Section: Introductionmentioning

confidence: 99%

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Maximizing total sugar recovery from pretreatment-hydrolysis of sweet sorghum bagasse through cultivar selection and process optimization

Bedzo

Diedericks

McIntosh

et al. 2023

Preprint

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The nature of a sweet sorghum cultivar influences the recovery of sugars from the bagasse during pretreatment. The sugars recovered are used in applications for conversion to high-value products such as alcohols, organic acids, and other fuels and chemicals. The severity of the pretreatment used plays a crucial role in the yield and quality of the sugars that can be recovered. Therefore, a strategic approach was taken to lower the severity of the pretreatment process to a combined severity factor (CSF) value of 0.48, whilst maintaining a high level of total-sugar recovery (i.e. 68% (w/w) and higher). This was achieved by screening 23 sweet sorghum cultivars for high-performance characteristics at low-severity conditions and optimizing the pretreatment process conditions. The pretreatment conditions included time, temperature, and acid concentration ranges of 5 to 60 min, 150 to 210 oC, and 0.00% to 0.96% (w/w) H2SO4, respectively. Cultivar AP6 was identified as the best performer, producing the highest total sugar yield of 78.17%. A reduction in total by-product formation from 4.79 to 2.79 g/100 g biomass was also observed. Three preferred cultivars selected for pilot scale pretreatment using steam explosion resulted in maximum total sugar recoveries that exceeded 80% (w/w). Cultivar engineering/selection provides an opportunity to utilize lignocelluloses that will liberate sugars at desired yields while reducing the generation of by-products by implementing low severity pretreatments.

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Dilute Acid Hydrolysis of Sweet Sorghum Bagasse and Fermentability of the Hemicellulosic Hydrolysate

Cited by 16 publications

References 56 publications

Production of Ethanol from Hemicellulosic Sugars of Exhausted Olive Pomace by Escherichia coli

Production of Ethanol from Hemicellulosic Sugars of Exhausted Olive Pomace by Escherichia coli

Xylitol Production from Exhausted Olive Pomace by Candida boidinii

Maximizing total sugar recovery from pretreatment-hydrolysis of sweet sorghum bagasse through cultivar selection and process optimization

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