Extraction of High-Purity Lignins via Catalyst-free Organosolv Pulping from Low-Input Crops

Rumpf, Jessica; Tung, Xuan; Burger, René; Monakhova, Yulia B.; Schulze, Margit

doi:10.1021/acs.biomac.0c00123

Cited by 39 publications

(49 citation statements)

References 68 publications

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“…winter [55][56][57][58][59][60]. The results regarding the monolignol ratio are in good accordance with HSQC NMR data reported for lignins isolated from Miscanthus crops [31,52,[61][62][63][64][65] with the exception of the polysaccharide-lignin-linkages not found here in this study. This is most likely due to the mild catalyst-free organosolv pulping method used.…”

supporting

confidence: 90%

“…The organosolv process as a digestion method has proven itself in every case: it delivers pure lignins, free of sugar residues. The reproducibility of the catalyst-free process has recently been confirmed in another study [31]. If the differences in the lignins are not sufficient as a criterion for the preference for a particular genotype, one can judge based on the harvest yield or other criteria specifically relating to the plant itself, e.g.…”

Section: Resultsmentioning

confidence: 89%

“…In the following, the organosolv process, the determination of the chemical composition according to the NREL procedure as well as the HSQC NMR analyses are described. Further details could be found in the corresponding studies reported by our group [30,31,43,44].…”

Section: Methodsmentioning

confidence: 92%

“…phenylcoumaran (α-O-4'/β-5'), spirodienone (β-1'/β-O-4')). Reprinted from [31] under open access license.…”

mentioning

confidence: 99%

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Lignins Isolated via Catalyst-free Organosolv Pulping from Miscanthus x giganteus, M. sinensis, M. robustus and M. nagara: A Comparative Study

Schulze¹,

Bergs²,

Monakhova³

et al. 2021

Preprint

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As a low-input crop, Miscanthus offers numerous advantages that, in addition to agricultural applications, permits its exploitation for energy, fuel, and material production. Depending on the Miscanthus genotype, season, and harvest time as well as plant component (leaf versus stem), correlations between structure and properties of the corresponding isolated lignins differ. Here, a comparative study is presented between lignins isolated from M. x giganteus, M. sinensis, M. robustus and M. nagara using a catalyst-free organosolv pulping process. The lignins from different plant constituents are also compared regarding their similarities and differences regarding monolignol ratio and important linkages. Results showed that the plant genotype has the weakest influence on monolignol content and interunit linkages. In contrast, structural differences are more significant among lignins of different harvest time and/or season. Analyses were performed using fast and simple methods such as nuclear magnetic resonance (NMR) spectroscopy. Data was assigned to four different linkages (A: b-O-4 linkage, B: phenylcoumaran, C: resinol, D: b-unsaturated ester). In conclusion, A content is particularly high in leaf-derived lignins at just under 70 % and significantly lower in stem and mixture lignins at around 60 % and almost 65 %. The second most common linkage pattern is D in all isolated lignins, the proportion of which is also strongly dependent on the crop portion. Both stem and mixture lignins, have a relatively high share of approximately 20 % or more (maximum is M. sinensis Sin2 with over 30 %). In the leaf-derived lignins, the proportions are significantly lower on averageStem samples should be chosen highest possible lignin content is desired, specifically from the M. x giganteus genotype which revealed lignin contents up to 27 %.

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supporting

confidence: 90%

Section: Resultsmentioning

confidence: 89%

Section: Methodsmentioning

confidence: 92%

“…phenylcoumaran (α-O-4'/β-5'), spirodienone (β-1'/β-O-4')). Reprinted from [31] under open access license.…”

mentioning

confidence: 99%

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Lignins Isolated via Catalyst-free Organosolv Pulping from Miscanthus x giganteus, M. sinensis, M. robustus and M. nagara: A Comparative Study

Schulze¹,

Bergs²,

Monakhova³

et al. 2021

Preprint

Self Cite

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“…According to Martens [163], S. hermaphrodita also has the potential to be used in the manufacturing of natural fibre products, such as alternative turf, and it could even be used as raw material to produce 3D printing resin. Rumpf et al [164] found that through organosolv pulping, they could achieve a high quality lignin yield of 15.7% from S. perfoliatum that could be used to manufacture biodegradable plastics.…”

Section: Forage and Fibrementioning

confidence: 99%

Two Novel Energy Crops: Sida hermaphrodita (L.) Rusby and Silphium perfoliatum L.—State of Knowledge

et al. 2020

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Current global temperature increases resulting from human activity threaten many ecosystems and societies, and have led to international and national policy commitments that aim to reduce greenhouse gas emissions. Bioenergy crops provide one means of reducing greenhouse gas emissions from energy production and two novel crops that could be used for this purpose are Sida hermaphrodita (L.) Rusby and Silphium perfoliatum L. This research examined the existing scientific literature available on both crops through a systematic review. The data were collated according to the agronomy, uses, and environmental benefits of each crop. Possible challenges were associated with high initial planting costs, low yields in low rainfall areas, and for Sida hermaphrodita, vulnerability to Sclerotinia sclerotiorum. However, under appropriate environmental conditions, both crops were found to provide large yields over sustained periods of time with relatively low levels of management and could be used to produce large energy surpluses, either through direct combustion or biogas production. Other potential uses included fodder, fibre, and pharmaceutical uses. Environmental benefits included the potential for phytoremediation, and improvements to soil health, biodiversity, and pollination. The review also demonstrated that environmental benefits, such as pollination, soil health, and water quality benefits could be obtained from the use of Sida hermaphrodita and Silphium perfoliatum relative to existing bioenergy crops such as maize, whilst at the same time reducing the greenhouse gas emissions associated with energy production. Future research should examine the long-term implications of using Sida hermaphrodita and Silphium perfoliatum as well as improve knowledge on how to integrate them successfully within existing farming systems and supply chains.

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Mechanochemical Tailoring of Lignin Structure: Influence of Different Particle Sizes in the Organosolv Process

Bergrath,

Zeppetzauer,

Rumpf

et al. 2024

Macromolecular Bioscience

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The autocatalyzed ethanolic organosolv process is gaining increasing attention for the sulfur‐free isolation of lignin, which is subsequently used as a renewable substitute for various fossil‐based applications. For the first time, the mechanochemical influence of seven different particle sizes of two different biomasses on the respective organosolv lignin structure is examined. Wine pruning (Pinot Noir) and wine pomace (Accent) are used for organosolv process with particle sizes ranging from 2.0–1.6 mm to less than 0.25 mm. As particle size decreases, the weight‐average molecular weight increases, while the total phenol content decreases significantly. Additionally, the distribution of the lignin‐typical monolignols and relevant substructures, as determined by two‐dimensional heteronuclear nuclear magnetic resonance spectra single quantum coherence (HSQC), is observed. The degree of grinding of the biomass has a clear chemical–structural influence on the isolated HG and HGS organosolv lignins. Therefore, it is crucial to understand this influence to apply organosolv lignins in a targeted manner. In the future, particle size specifications in the context of the organosolv process should be expressed in terms of distribution densities rather than in terms of a smaller than specification.

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Extraction of High-Purity Lignins via Catalyst-free Organosolv Pulping from Low-Input Crops

Cited by 39 publications

References 68 publications

Lignins Isolated via Catalyst-free Organosolv Pulping from Miscanthus x giganteus, M. sinensis, M. robustus and M. nagara: A Comparative Study

Lignins Isolated via Catalyst-free Organosolv Pulping from Miscanthus x giganteus, M. sinensis, M. robustus and M. nagara: A Comparative Study

Two Novel Energy Crops: Sida hermaphrodita (L.) Rusby and Silphium perfoliatum L.—State of Knowledge

Mechanochemical Tailoring of Lignin Structure: Influence of Different Particle Sizes in the Organosolv Process

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