Laccase modified lignosulfonates as novel binder in pigment based paper coating formulations

The impact of lignin sulfonation on its reactivity with laccase and laccase/HBT

“…Remarkably, when lignosulfonate is used as a substrate, both laccase and LMS incubations are shown to induce polymerization. 4,6,22,23,34 To date, there was no mechanistic explanation for this observation, since the effects of laccase and LMS have only been investigated on polymeric lignosulfonate. These studies reported changes in molecular weight or overall changes in chemical structure, but did not describe detailed reaction pathways.…”

“…Depending on the intended application, lignin can be valorized via different routes, such as polymerization, depolymerization and grafting. [6][7][8] Preferably, valorization should occur via sustainable approaches, such as enzymatic modifications. One of the few enzymes known to be active toward lignin is laccase (E.C.…”

Enzyme Catalyzed Copolymerization of Lignosulfonates for Hydrophobic Coatings

“…Presenting a potential alternative to fossilbased binders used e.g., in paper coating formulations where styrene-butadiene or styrene-acrylate latex are used. The findings were, that the produced LS polymers performed nearly as good as the actually used latex-based binders (Ortner et al, 2018). However, a possible way to improve the performance would be an increase in hydrophobicity, since penetration of the LS containing coatings into hydrophilic cellulose would then be reduced which is beneficial.…”

“…As stated before, a novel combination of processes was developed in our group, that enables extensive laccase mediated polymerization of LS when a steady external oxygen supply is granted resulting in an increased dispersibility (Nugroho Prasetyo et al, 2010;Ortner et al, 2015Ortner et al, , 2018Huber et al, 2016). Recently, the best conditions for this laccase mediated polymerization process of LS to achieve big polymers in a short time were investigated (Weiss et al, 2020).…”

“…In the sulfite pulping process lignosulfonates (LS) are produced, resulting in a water-soluble form of lignin through the introduction of sulfonate groups during the pulping process (Constant et al, 2016;Li and Takkellapati, 2018). A possible application thereof was recently demonstrated by our group, where surface coatings were synthesized through laccase mediated polymerization of LS (Ortner et al, 2018).…”