Selected Examples for Peroxidase-Initiated Polymerizations

To date, approximately 40 publications reporting on peroxidase-catalyzed polymerizations are available. The biocatalyst of choice for these works clearly is HRP. Other catalysts such as soybean peroxidase [30], manganese peroxidase [8], or hematin [15] have been used scarcely. Furthermore, most of these deal with the polymerization of acrylamide and styrene as a model compounds (Table 6.3). 

Avery creative application of the system HRP/H202/Acac for graft polymerization of acryl amide on starch was reported recently by Biswas and coworkers [39], Thus, a biocatalytic alternative route to the established cerium( IV)-based routes to poly(acrylate)-grafted starch with applications as superabsorbers [44] or performance additives in paper making [45] or textile sizing [46] was reported. Under non-optimized conditions grafting efficiencies of up to 65% are reported. The 

0 General [13,16, 20, 22] Mediator-free [28] Various [i-di kelone mediators [25] Immobilized enzyme [38] Water in SCC02 polymerizations [19] Surfactants [21] Poly acrylamide starch graft polymers[39[. 

Obviously, the biocatalytic grafting mechanism differs significantly from the chemical mechanism [47] and further studies will be necessary to clarify the mechanism. 

Next to their natural phenolic substrates, laccases also accept a range of non-phenolic substrates such as ABTS, syringaldazine, and TEMPO and derivates 

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