TY  - JOUR
U1  - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed)
A1  - Bergs, Michel
A1  - Monakhova, Yulia
A1  - Diehl, Bernd W.
A1  - Konow, Christopher
A1  - Völkering, Georg
A1  - Pude, Ralf
A1  - Schulze, Margit
T1  - Lignins Isolated via Catalyst-Free Organosolv Pulping from Miscanthus x giganteus, M. sinensis, M. robustus and M. nagara: A Comparative Study
JF  - Molecules
N2  - 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: β-O-4 linkage, B: phenylcoumaran, C: resinol, D: β-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 average. Stem samples should be chosen if the highest possible lignin content is desired, specifically from the M. x giganteus genotype, which revealed lignin contents up to 27%. Due to the better frost resistance and higher stem stability, M. nagara offers some advantages compared to M. x giganteus. Miscanthus crops are shown to be very attractive lignocellulose feedstock (LCF) for second generation biorefineries and lignin generation in Europe.
KW  - Lignin
KW  - Miscanthus sinensis
KW  - Miscanthus nagara
KW  - Miscanthus robustus
KW  - Miscanthus x giganteus
KW  - low-input crops
KW  - monolignol ratio
UN  - https://nbn-resolving.org/urn:nbn:de:hbz:1044-opus-53259
SN  - 1420-3049
SS  - 1420-3049
U6  - https://doi.org/10.3390/molecules26040842
DO  - https://doi.org/10.3390/molecules26040842
PM  - 33562747
VL  - 26
IS  - 4
SP  - 21
S1  - 21
PB  - MDPI
CY  - Basel
ER  -