The development of semipermeable membranes has led to a wide use of ultrafiltration (UF) in many fields, including, the isolation and fractionation of technical lignins (Zinovyev et al., 2017, Sulaeva et al., 2019, Sevastyanova et al., 2014). UF also allows for the quantitative isolation of lignosulfonates with high purity (Sumerskii et al., 2015).
The application of membranes with different molecular weight cut-offs provides selected lignin fractions with low dispersity, which are of interest both for analytical purposes and in development of lignin applications.
ALICE core facility offers analytical and preparative scale lignin purification by means of UF with molecular-weight cut-off of 1, 3, 5, 10, 30 and 100 kDa.
Additionally, ALICE offers a novel approach for isolation of lignosulfonates from spent sulphite liquor by an adsorption method (Sumerskii et al., 2015). We offer this method in three variants: small analytical scale, preparative scale, and large preparative scale, allowing to isolate up to 1 gram, 10 grams, and 100 grams of purified lignosulfonate, respectively.
Sevastyanova, O., Helander, M., Chowdhury, S., Lange, H., Wedin, H., Zhang, L., Ek, M., Kadla, J. F., Crestini, C. & Lindström, M. E. (2014)
Tailoring the molecular and thermo–mechanical properties of kraft lignin by ultrafiltration.
Journal of Applied Polymer Science, 131, 40799. doi: 10.1002/app.40799
Sulaeva, I., Vejdovszky, P., Henniges, U., Mahler, A. K., Rosenau, T., & Potthast, A. (2019).
Molar Mass Characterization of Crude Lignosulfonates by Asymmetric Flow Field-Flow Fractionation.
ACS Sustainable Chemistry & Engineering, 7(1), 216-223. doi: 10.1021/acssuschemeng.8b02856
Sumerskii, I., Korntner, P., Zinovyev, G., Rosenau, T., & Potthast, A. (2015).
Fast track for quantitative isolation of lignosulfonates from spent sulfite liquors.
Rsc Advances, 5(112), 92732-92742. doi:10.1039/c5ra14080c
Zinovyev, G., Sumerskii, I., Korntner, P., Sulaeva, I., Rosenau, T., & Potthast, A. (2017).
Molar mass-dependent profiles of functional groups and carbohydrates in kraft lignin.
Journal of Wood Chemistry and Technology, 37(3), 171-183. doi: 10.1080/02773813.2016.1253103