Role and importance of solvents for the fractionation of lignocellulosic biomass

Thoresen, Petter Paulsen; Lange, Heiko; Christakopoulos, Paul; Μάτσακας, Λεωνίδας

doi:10.1016/j.biortech.2022.128447

Cited by 13 publications

(1 citation statement)

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“…Hereby, the recalcitrant structure of lignocellulose is broken up through the application of elevated temperature and pressure. As lignin is more soluble in organic solvents (Jääskeläinen et al 2017 ), these are used during hydrothermal pretreatments to effectively remove lignin from the remaining biomass in the so-called organosolv processes (Paulsen Thoresen et al 2023 ; Parot et al 2022 ). Varriale et al showed a 41.1% increase in carbohydrate yield from enzymatic hydrolysis of mixed wood chips after an organosolv treatment compared to untreated material (Varriale et al 2022 ).…”

Section: Resultsmentioning

confidence: 99%

Municipal green waste as substrate for the microbial production of platform chemicals

Volkmar,

Maus,

Weisbrodt

et al. 2023

Bioresour. Bioprocess.

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In Germany alone, more than 5·106 tons of municipal green waste is produced each year. So far, this material is not used in an economically worthwhile way. In this work, grass clippings and tree pruning as examples of municipal green waste were utilized as feedstock for the microbial production of platform chemicals. A pretreatment procedure depending on the moisture and lignin content of the biomass was developed. The suitability of grass press juice and enzymatic hydrolysate of lignocellulosic biomass pretreated with an organosolv process as fermentation medium or medium supplement for the cultivation of Saccharomyces cerevisiae, Lactobacillus delbrueckii subsp. lactis, Ustilago maydis, and Clostridium acetobutylicum was demonstrated. Product concentrations of 9.4 gethanol L−1, 16.9 glactic acid L−1, 20.0 gitaconic acid L−1, and 15.5 gsolvents L−1 were achieved in the different processes. Yields were in the same range as or higher than those of reference processes grown in established standard media. By reducing the waste arising in cities and using municipal green waste as feedstock to produce platform chemicals, this work contributes to the UN sustainability goals and supports the transition toward a circular bioeconomy. Graphical Abstract

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