Effect of functional groups in acid constituent of deep eutectic solvent for extraction of reactive lignin

Tan, Yee Tong; Ngoh, Gek Cheng; Chua, Adeline Seak May

doi:10.1016/j.biortech.2019.02.010

Cited by 190 publications

(80 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A rigorous study of the impact of different HBDs on lignin extraction (when paired with choline chloride), determined that lactic acid resulted in the highest lignin yield, exceeding the 8 other carboxylic acids investigated . Numerous authors have published their findings on the influence of lactic acid to choline chloride ratio on the delignification of biomass .…”

Section: Discussionmentioning

confidence: 99%

Deep Eutectic Solvent Extraction of High‐Purity Lignin from a Corn Stover Hydrolysate

et al. 2020

View full text Add to dashboard Cite

A lactic acid/chlorine chloride‐based deep eutectic solvent (DES) was used for the extraction of high‐purity lignin (up to 94.7 %) in high yield (up to 75 %) from the hydrolysis/fermentation residue corn stover hydrolysate (CSH), which was generated from a pilot‐plant‐scale biorefinery. A range of extraction conditions were investigated, which involved varying reaction temperature, time, and DES composition. The relationship between lignin yield, purity, and structural characteristics with DES treatment conditions was determined. The extraction of high‐purity lignin from hydrolysis/fermentation residues presents a promising approach for enhancing the economic feasibility of a lignocellulose biorefinery. It was also determined that DES extraction can produce lignin with a controlled range of molecular weight and functional group content.

show abstract

Section: Discussionmentioning

confidence: 99%

Deep Eutectic Solvent Extraction of High‐Purity Lignin from a Corn Stover Hydrolysate

et al. 2020

View full text Add to dashboard Cite

show abstract

“…DESs selected for this study include a mixture of the hydrogen bond acceptor choline chloride (ChCl) with various hydrogen bond donors. These mixtures include ChCl : lactic acid (1 : 10 mole ratio), ChCl : malic acid (1 : 1 mole ratio), ChCl : citric acid (1 : 2 mole ratio), ChCl : oxalic acid (1 : 1 mole ratio), ChCl : acetic acid (1 : 2 mole ratio), ChCl : succinic acid (1 : 2 mole ratio), ChCl : urea (1 : 2 mole ratio), ChCl : malonic acid (1 : 1 mole ratio), ChCl : 1,4‐butanediol (1 : 2 mole ratio), and ChCl : glycerol (1 : 1 mole ratio) …”

Section: Resultsmentioning

confidence: 99%

2D HSQC Chemical Shifts of Impurities from Biomass Pretreatment

Bryant

Yoo

et al. 2020

ChemistrySelect

View full text Add to dashboard Cite

Two dimensional (2D) heteronuclear single quantum coherence (HSQC) nuclear magnetic resonance (NMR) is a powerful analytical method which can be used to elucidate the structure of biomass. During processing, biomass is typically subjected to some form of chemical treatment which can be performed with a variety of compounds. The presence of these compounds, even in trace amounts, has the potential to contaminate the sample and lead to misinterpretation of the HSQC spectra. Here we report the chemical shifts of 29 compounds commonly used in biomass processing which have the potential to contaminate the biomass samples and lead to the misinterpretation of peaks associated with biomass (Populus trichocarpa) pretreated via autohydrolysis. The identification of these chemical shifts could serve as a valuable tool in preventing errors in characterizing biomass via HSQC.

show abstract

“…The effect of newly synthesized DESs in pretreatment was investigated with rice straw. ChCl:LAC was regarded as a positive control since it had been applied in pretreatment of rice straw and lignin extraction [39,40]. Total sugars including glucose, xylose and arabinose were determined.…”

Section: Evaluation Of Eacl:lac In the Pretreatment Of Lignocellulosimentioning

confidence: 99%

Facilely reducing recalcitrance of lignocellulosic biomass by a newly developed ethylamine-based deep eutectic solvent for biobutanol fermentation

Xing

et al. 2020

Biotechnol Biofuels

View full text Add to dashboard Cite

Background Biobutanol is promising and renewable alternative to traditional fossil fuels and could be produced by Clostridium species from lignocellulosic biomass. However, biomass is recalcitrant to be hydrolyzed into fermentable sugars attributed to the densely packed structure by layers of lignin. Development of pretreatment reagents and processes for increasing surface area, removing hemicellulose and lignin, and enhancing the relative content of cellulose is currently an area of great interest. Deep eutectic solvents (DESs), a new class of green solvents, are effective in the pretreatment of lignocellulosic biomass. However, it remains challenging to achieve high titers of total sugars and usually requires combinatorial pretreatment with other reagents. In this study, we aim to develop novel DESs with high application potential in biomass pretreatment and high biocompatibility for biobutanol fermentation. Results Several DESs with betaine chloride and ethylamine chloride (EaCl) as hydrogen bond acceptors were synthesized. Among them, EaCl:LAC with lactic acid as hydrogen bond donor displayed the best performance in the pretreatment of corncob. Only by single pretreatment with EaCl:LAC, total sugars as high as 53.5 g L−1 could be reached. Consecutive batches for pretreatment of corncob were performed using gradiently decreased cellulase by 5 FPU g−1. At the end of the sixth batch, the concentration and specific yield of total sugars were 58.8 g L−1 and 706 g kg−1 pretreated corncob, saving a total of 50% cellulase. Utilizing hydrolysate as carbon source, butanol titer of 10.4 g L−1 was achieved with butanol yield of 137 g kg−1 pretreated corncob by Clostridium saccharobutylicum DSM13864. Conclusions Ethylamine and lactic acid-based deep eutectic solvent is promising in pretreatment of corncob with high total sugar concentrations and compatible for biobutanol fermentation. This study provides an efficient pretreatment reagent for facilely reducing recalcitrance of lignocellulosic materials and a promising process for biobutanol fermentation from renewable biomass.

show abstract

Effect of functional groups in acid constituent of deep eutectic solvent for extraction of reactive lignin

Cited by 190 publications

References 41 publications

Deep Eutectic Solvent Extraction of High‐Purity Lignin from a Corn Stover Hydrolysate

Deep Eutectic Solvent Extraction of High‐Purity Lignin from a Corn Stover Hydrolysate

2D HSQC Chemical Shifts of Impurities from Biomass Pretreatment

Facilely reducing recalcitrance of lignocellulosic biomass by a newly developed ethylamine-based deep eutectic solvent for biobutanol fermentation

Contact Info

Product

Resources

About