(1) Ragauskas, A. J.; Beckham, G. T.; Biddy, M. J.; Chandra, R.;Chen, F.; Davis, M. F.; Davison, B. H.; Dixon, R. A.; Gilna, P.; Keller,M.; Langan, P.; Naskar, A. K.; Saddler, J. N.; Tschaplinski, T. J.; Tuskan, G. A.; Wyman, C. E. Lignin valorization: improving lignin processing in the biorefinery. Science 2014, 344, 1246843.
(2) Ando, H.; Sakaki, T.; Kokusho, T.; Shibata, M.; Uemura, Y.; Hatate, Y. Decomposition behavior of plant biomass in hot- compressed water. Ind. Eng. Chem. Res. 2000, 39, 3688−3693.
(3) Yu, Y.; Lou, X.; Wu, H. Some recent advances in hydrolysis of biomass in hot-compressed water and its comparisons with other hydrolysis methods. Energy Fuels 2008, 22, 46−60.
(4) Tirtowidjojo, S.; Sarkanen, K. V.; Pla, F.; McCarthy, J. L. Kinetics of organosolv delignification in batch- and flow-through reactors. Holzforschung 1988, 47, 177−183.
(5) Erdocia, X.; Prado, R.; Corcuera, M. Ã.; Labidi, J. Influence of reaction conditions on lignin hydrothermal treatment. Front. Energy Res. 2014, 2, 1−7.
(6) Phaiboonsilpa, N.; Saka, S. Two-step hydrolysis of Japanese cedar as treated by semi-flow hot-compressed water. J. Wood Sci. 2010, 56, 331−338.
(7) Yamazaki, J.; Minami, E.; Saka, S. Liquefaction of beech wood in various supercritical alcohols. J. Wood Sci. 2006, 52, 527−532.
(8) Rabemanolontsoa, H.; Saka, S. Comparative study on chemical composition of various biomass species. RSC Adv. 2013, 3, 3946− 3956.
(9) Leng, L.; Yang, L.; Leng, S.; Zhang, W.; Zhou, Y.; Peng, H.; Li, H.; Hu, Y.; Jiang, S.; Li, H. A review on nitrogen transformation in hydrochar during hydrothermal carbonization of biomass containing nitrogen. Sci. Total Environ. 2021, 756, 143679.
(10) Fan, Y.; Hornung, U.; Dahmen, N.; Kruse, A. Hydrothermal liquefaction of protein-containing biomass: study of model com- pounds for Maillard reactions. Biomass Convers. Biorefin. 2018, 8, 909−923.
(11) Zeb, H.; Riaz, A.; Kim, J. Effective conversion of the carbohydrate-rich macroalgae (Saccharina japonica) into bio-oil using low-temperature supercritical methanol. Energy Convers. Manage. 2017, 151, 357−367.
(12) Takada, M.; Minami, E.; Kawamoto, H. Topochemistry of the delignification of Japanese beech (Fagus crenata) wood by super- critical methanol treatment. ACS Omega 2021, 6, 20924−20930.
(13) Björkman, A. Studies on finely divided wood. Part 1. Extraction of lignin with neutral solvents. Sven Papperstidn 1956, 59, 477−485.
(14) Wise, L. E.; Murphy, M.; Daddieco, A. A. Chlorite holocellulose, its fractionation and bearing on summative wood analysis and on studies on the hemicelluloses. Pap. Trade 1946, 29, 210−218.
(15) Saka, S.; Ueno, T. Chemical conversion of various celluloses to glucose and its derivatives in supercritical water. Cellulose 1999, 6, 177−191.
(16) Ishikawa, Y.; Saka, S. Chemical conversion of cellulose as treated in supercritical methanol. Cellulose 2001, 8, 189−195.
(17) Dence, C. W., 1992. The Determination of Lignin. Lin, S. Y., Dence, C. W. (Eds.), Methods in Lignin Chemistry; Springer Verlag: Berlin, pp. 33−58.
(18) Shuai, L.; Saha, B. Towards high-yield lignin monomer production. Green Chem. 2017, 19, 3752−3758.
(19) Pielhop, T.; Larrazábal, G. O.; Studer, M. H.; Brethauer, S.; Seidel, C.-M.; Rudolf von Rohr, P. Lignin repolymerisation in spruce autohydrolysis pretreatment increases cellulase deactivation. Green Chem. 2015, 17, 3521−3532.
(20) Kruse, A.; Maniam, P.; Spieler, F. Influence of proteins on the hydrothermal gasification and liquefaction of biomass. 2. Model compounds. Ind. Eng. Chem. Res. 2007, 46, 87−96.
(21) Titirici, M.-M.; Antonietti, M.; Baccile, N. Hydrothermal carbon from biomass: a comparison of the local structure from poly- to monosaccharides and pentoses/hexoses. Green Chem. 2008, 10, 1204.
(22) Lundquist, K.; Lundgren, R.; Danielsen, J.; Haaland, A.; Svensson, S. Acid degradation of lignin. Acta Chem. Scand. 1972, 26, 2005−2023.