Solubilization and mineralization of lignin by white rot fungi

Article Abstract:

The conditions affecting the production of soluble products and CO2 in several species of white rot fungi were determined by monitoring radiolabelled carbon products and CO2 as well as the activities of lignin peroxidase (LiP) and manganese peroxidase (MnP). The results showed that nutrient nitrogen could inhibit lignin degradation in all species. However, other conditions can regulate the process leading to soluble products and CO2 in a manner that suggests separate regulatory pathways. Other factors, like manganese and pH have different effects on different species.

Physiological aspects, Microbial metabolism, Wood-decaying fungi

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Stabilization of lignin peroxidases in white rot fungi by tryptophan

Article Abstract:

The stabilization of lignin peroxidases (LiP) in white rot fungi by tryptophan was investigated to identify L-tryptophan (TRP) substrates for LiP oxidation. The TRP stimulation considered two possibilities such as direct induction of LiP gene expression and protection against inactivation. Results show that supplementation of various cultures of white rot fungi with tryptophan have a large stimulatory effect on lignin peroxidase activity levels.

Tryptophan

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Effects of manganese peroxidase on residual lignin of softwood kraft pulp

Article Abstract:

Manganese peroxidase can be used to increase the bleachability of kraft pulps. It is hypothesized that the bleaching action is brought about by residual lignin chelation by the magnesium ion. However, studies have shown that manganese peroxidase partially oxidize lignin enhancing the extraction of residual lignin by alkali. Manganese peroxidase does not degrade lignin into soluble fragments.

Bleaching, Wood-pulp, Wood pulp

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