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- Title
Maximizing Total Sugar Recovery from Low Severity Pretreatment-Hydrolysis of Sweet Sorghum Bagasse Through Cultivar Selection and Process Optimization.
- Authors
Bedzo, Oscar K. K.; Diedericks, Danie; McIntosh, Paul; Rorke, Daneal C. S.; van Rensburg, Eugene; Görgens, Johann F.
- Abstract
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 0.00–0.96% (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 selection provides an opportunity to utilize sweet sorghum bagasse that will liberate sugars at desired yields while reducing the generation of by-products by implementing low severity pretreatments.
- Subjects
SORGO; BAGASSE; PROCESS optimization; ORGANIC acids; SUGARS; SUGAR; CULTIVARS
- Publication
BioEnergy Research, 2024, Vol 17, Issue 1, p234
- ISSN
1939-1234
- Publication type
Article
- DOI
10.1007/s12155-023-10642-2