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Tannin biodegradation

The second group of tannins are the condensed tannins, or polymeric proanthocyanidins (2). These are composed offlavonoid units, and are more recalcitrant to biodegradation than hydrolysable tannins. Of these, the... [Pg.559]

In 1913, Knudson (17) reported that tannic acid (the commercial name of the Chinese gall tannin) could be degraded by a strain of Aspergillus niger previously the French scientist Pottevin (in 1900) had named this enzyme tannase (10). Since then, most of the progress on elucidating the mechanisms of hydrolysable tannin biodegradation has occurred since 1960. [Pg.560]

Condensed tannins were considered to be highly recalcitrant to biodegradation until Basaraba (3) reported that some bacterial isolates could utilize wattle tannin as both a carbon and energy source. Later, Lewis and Starkey... [Pg.562]

Microbial Degradation of Catechin. Since (+) catechin is a possible biodegradation product from condensed tannins, its utilization and bioconversion have been extensively examined by several research groups using fungi, bacteria and yeasts. [Pg.564]

Some microorganisms degrading condensed tannins have been isolated and described, but no reports on the mechanism of the depolymerization process, or the enzymes involved in biodegradation, have appeared. It must be stressed that condensed tannin degradation may be associated with other... [Pg.564]

Phenols of enviromnental interest are derived from a wide variety of industrial sources, or present as biodegradation products of humic substances, tannins, and lignins, and as degradation products of many chlorinated phenoxyacid herbicides and organophosphorous pesticides. Phenols, especially chlorophenols, are persistent, and toxic at a few pg/1. Therefore, phenols are hsted at the US-EPA hst of priority pollutants and the EU Directive 76/464/EEC as dangerous substances. The samples to be analysed can be surface waters or industrial effluents. [Pg.200]

Tannins and tannic acid occur naturally in plants. Essentially all wood and plant tissue contain tannins. Therefore, biodegradation is expected to be the major environmental fate process for tannic acid. [Pg.2527]

Taylor, J., Bean, S. R., loerger, B. P., and Taylor, J. R. N. (2007). Preferential binding of sorghum tannins with gamma-kafirin and the influence of tannin binding on kafirin digestibility and biodegradation. /. Cereal Sci. 46, 22-31. [Pg.51]

Tannins are recalcitrant molecules and resist microbial attack [12]. Condensed tannins are more resistant fhan hydrolyzable tannins [13], and are toxic to a variety of microorganisms. However, there are several reports by various workers regarding the role of fungi in biodegradation of tannins. [Pg.260]

Otuk and Deschamps [26], for the first time, reported the capacity of yeasts to degrade a condensed tannin. The biodegradation of wattle tannin with six strains of yeasts, isolated from decaying bark samples, was tested. [Pg.263]

Hillis, W. E., Biosynthesis of tannins, in Biosynthesis and Biodegradation of Wood Components (T. Higuchi, ed.), 325-347, Academic Press, Orlando, FL, 1985. [Pg.213]

Munz et al. (2009) evaluated the role of tannins in both conventional activated sludge processes (ASP) and MBR. They found similar values in the removal of natural and synthetic tannins by comparing the two treatments. Further, in both processes the nitrification process presented extremely reduced kinetics. Finally, the inhibition of the nitrifying biomass was attributed to the whole wastewater rather than the non-biodegradable fraction. [Pg.754]

Hillis W E 1985 Biosynthesis of tannins. In Biosynthesis and biodegradation of wood components. Academic Press New York, 325-347... [Pg.641]

Bhat TK, Makkar HPS, Singh B (1996) Isolation of a tarmin-protein complex-degrading fungus from faeces of hiU cattle. J Appl Microbiol 22 257-258 Bhat TK, Singh B, Sharma OP (1998) Microbial degradation of tannins - a cruient perspective. Biodegradation 9 343-357... [Pg.257]


See other pages where Tannin biodegradation is mentioned: [Pg.225]    [Pg.482]    [Pg.364]    [Pg.559]    [Pg.560]    [Pg.562]    [Pg.565]    [Pg.565]    [Pg.198]    [Pg.4146]    [Pg.1351]    [Pg.206]    [Pg.121]    [Pg.79]    [Pg.97]    [Pg.301]    [Pg.265]    [Pg.261]    [Pg.128]    [Pg.383]    [Pg.356]    [Pg.47]    [Pg.299]    [Pg.468]    [Pg.252]   
See also in sourсe #XX -- [ Pg.260 , Pg.265 ]




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