@article{monogioudi_permi_filpponen_lienemann_li_argyropoulos_buchert_mattinen_2011, title={Protein analysis by P-31 NMR spectroscopy in ionic liquid: Quantitative determination of enzymatically created cross-links}, volume={59}, number={4}, journal={Journal of Agricultural and Food Chemistry}, author={Monogioudi, E. and Permi, P. and Filpponen, I. and Lienemann, M. and Li, B. and Argyropoulos, D. and Buchert, J. and Mattinen, M. L.}, year={2011}, pages={1352–1362} }
 @article{li_filpponen_argyropoulos_2010, title={Acidolysis of Wood in Ionic Liquids}, volume={49}, ISSN={["0888-5885"]}, DOI={10.1021/ie1000983}, abstractNote={Three wood species including Eucalyptus grandis (E. grandis), Southern pine (S. pine), and Norway spruce thermomechanical pulp (N. spruce TMP) were dissolved in the ionic liquid (IL) 1-allyl-3-methylimidazolium chloride ([Amim]Cl), and then they were pretreated with small amounts of hydrochloric acid, as a function of time. The materials regenerated from the IL solutions were determined to contain significantly higher amounts of lignin than the original wood. Detailed analyses of the recovered IL revealed the presence of typical wood degradation compounds, such as 5-hydroxymethylfurfural, furan-2-carboxylic acid, catechol, methylcatechol, methylguaiacol, acetoguaiacone, and acetol. The acidic pretreatment of these wood species in IL resulted in not only the near-complete hydrolysis of cellulose and hemicelluloses but also in a significant amount of lignin degradation. Aqueous reactions (under identical acid concentrations) showed a remarkably lower efficiency, demonstrating that ILs offer a unique environ...}, number={7}, journal={INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH}, author={Li, Bin and Filpponen, Ilari and Argyropoulos, Dimitris S.}, year={2010}, month={Apr}, pages={3126–3136} }
 @article{li_asikkala_filpponen_argyropoulos_2010, title={Factors Affecting Wood Dissolution and Regeneration of Ionic Liquids}, volume={49}, ISSN={["0888-5885"]}, DOI={10.1021/ie901560p}, abstractNote={Three wood species, eucalyptus grandis (E. grandis), southern pine (S. pine), and Norway spruce thermomechanical pulp (N. spruce TMP) were pretreated by dissolution in the ionic liquid (IL) 1-allyl-3-methylimidazolium chloride ([AMIM]Cl). The wood was regenerated from the ionic liquid in high yield and the recycling of the ionic liquid was nearly quantitative. The lignin contents and the efficiencies of cellulase enzymatic hydrolyses of the regenerated wood were examined offering an understanding into the IL pretreatment efficiency. The components that remained within the recycled ILs were qualitatively characterized by 31P NMR spectroscopy. Wood density, pulverization intensity, and the nature of the regeneration nonsolvents were investigated as factors affecting the overall process. An increase in the wood density decreased the efficiency of the pretreatment, whereas extended pulverization periods decreased the yield of the regenerated wood after the IL pretreatment,with more glucose being released duri...}, number={5}, journal={INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH}, author={Li, Bin and Asikkala, Janne and Filpponen, Ilari and Argyropoulos, Dimitris S.}, year={2010}, month={Mar}, pages={2477–2484} }
 @article{mattinen_filpponen_jarvinen_li_kallio_lehtinen_argyropoulos_2009, title={Structure of the Polyphenolic Component of Suberin Isolated from Potato (Solanum tuberosum var. Nikola)}, volume={57}, ISSN={["1520-5118"]}, DOI={10.1021/jf9020834}, abstractNote={Suberin is present in the underground parts of vegetables and in the bark of trees. Characterization of suberin and the structure of its polyphenolic component have been hampered by insolubility of the polymers. Thus, enzymatically isolated and extractive free suberin enriched fraction from potato, Solanum tuberosum var. Nikola, and the chemically further fractionated phenolics were characterized in solid state by FTIR, DSC, and elemental analysis to identify the groups and to verify success of isolation. For MW and quantitative determination of the groups, polymers were solubilized in ionic liquid derivatized and analyzed by GPC and (31)P NMR. Suberin enriched fraction, MW = ca. 44 x 10(3) g/mol, is a mixture of carbohydrates and polyesters of aliphatic long chain hydroxy fatty acids and diacids linked via ester bonds to the phenolics, MW = ca. 27 x 10(3) g/mol, formed by guaiacyl- and p-hydroxyphenyl structures. Phenolics in peels may be important sources of antioxidants for various applications.}, number={20}, journal={JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY}, author={Mattinen, Maija-Liisa and Filpponen, Ilari and Jarvinen, Riika and Li, Bin and Kallio, Heikki and Lehtinen, Pekka and Argyropoulos, Dimitris}, year={2009}, month={Oct}, pages={9747–9753} }