Degradation of lignosulfonic and tannic acids by ligninolytic soil fungi cultivated under icroaerobic conditions

Abstract

Soil fungi were evaluated regarding their ability to degrade lignin-related compounds by producing the ligninolytic enzymes. Lignosulfonic and tannic acids were used as sole carbon sources during 30 days under microaerobic and very-low-oxygen conditions. The fungi produced lignin-peroxidase, manganese-peroxidase and laccase. Expressive degradations was observed by C 18 reversed-phase HPLC, indicating the biodegradation potential of these fungi,showing more advantages than obligate anaerobes to decontaminate the environment when present naturally.

Pretreatment strategies for delignification of sugarcane bagasse: a review

“…These microorganisms produce several ligninolytic enzymes (laccases, manganese peroxidases and lignin peroxidases) that catalyze one-electron oxidation of lignin units, producing aromatic radicals (Giardina et al 2000). Lignin degradation is mainly attributed to the secondary metabolism, or to restricted availability of nitrogen, carbon, or sulphur, and it is normally not degraded as sole carbon and energy sources, requiring additional co-substrates such as cellulose, hemicellulose or glucose (Silva et al 2010). Some white-rot fungi preferentially attack lignin more readily than hemicellulose and cellulose.…”

Combined biodegradation and ozonation for removal of tannins and dyes for the reduction of pollution loads

“…The dyes from textile industry were degraded to the level of 70% by A. niger sp. (Ali et al 2008(Ali et al , 2009Silva et al 2010) 3.3 Ozone treatment for wattle extract, chrome tannin, dye, and a mixture of these compounds To enhance the biodegradation rate, ozonation was carried out with the earlier biodegraded samples and the results are presented in Tables 1 and 2. The wattle extract sample that had been initially treated with A. niger shows COD of 4,010 ppm before the start of ozonation.…”

“…The direct discharge of effluents from tanneries into bodies of water has grown environmental problems. Most of these waste waters are extremely complex mixtures containing inorganic and organic compounds (Silva et al 2010). The environmental committee has recommended the need to dilute the raw waste water to 100-150 times with fresh water in order to prevent the damage of acqua lives.…”

Characterization of the Oxidative Enzyme Potential in Wild White Rot Fungi From Misiones (Argentina)

“…Phenoloxidase activity (PhOX) is noticed by the agar color change of samples grown on solid MEA supplemented with 0.5% w/v tannic acid (Bavendamm 1928, Serrano Silva et al 2010. After seven days of incubation at 28°C, a dark brown color around the mycelium is considered a positive result (Rayner and Boddy, 1988).…”