Mechanisms by Which Soluble Humic Substances Alter the Kinetics of Pentachlorophenol Transformation by Trametes versicolor Laccase

2011 ◽  
Vol 28 (11) ◽  
pp. 819-825 ◽  
Author(s):  
Apaporn Siripornprasarn ◽  
Ekawan Luepromchai ◽  
Mark A. Nanny
Keyword(s):  
Humic Substances ◽  
Trametes Versicolor ◽  
Kinetics Of

Kinetics of the sulfate radical-mediated photo-oxidation of humic substances

2007 ◽  
Vol 40 (1) ◽  
pp. 19-24 ◽  
Author(s):  
Pedro M. David Gara ◽  
Gabriela N. Bosio ◽  
Mónica C. Gonzalez ◽  
Daniel O. Mártire
Keyword(s):  
Humic Substances ◽  
Sulfate Radical ◽  
Photo Oxidation ◽  
Kinetics Of

scholarly journals Biosorption of Cr(VI) from Aqueous Solutions UsingTrametes Versicolor PolyporusFungi

2008 ◽  
Vol 5 (3) ◽  
pp. 499-510 ◽  
Author(s):  
M. Venkata Subbaiah ◽  
S. Kalyani ◽  
G. Sankara Reddy ◽  
Veera M. Boddu ◽  
A. Krishnaiah
Keyword(s):  
Trametes Versicolor ◽  
Isotherm Models ◽  
Model Parameters ◽  
Kinetics Of Adsorption ◽  
Chromium Vi ◽  
Adsorption Isotherm Models ◽  
Adsorption Data ◽  
Naoh Solution ◽  
Sorption Parameters ◽  
Kinetics Of

Removal of chromium(VI) from aqueous solution was studied using abundantly availabletrametes versicolor polyporusfungi as biosorbing medium under equilibrium and column flow conditions. Various sorption parameters such as contact time, effect of pH, concentration of Cr(VI) and amount of biomass on the adsorption capacity of the biosorbent were studied. The equilibrium adsorption data were fitted to Freundlich and Langmuir adsorption isotherm models and the model parameters are evaluated. In addition, the data were used to predict the kinetics of adsorption. The results indicated that the adsorption of Cr(VI) on fungi followed second order kinetics. The column flow adsorption data were used to predict break through curves. The fungi loaded with Cr(VI) was regenerated with 0.1 M NaOH solution and the regenerated biomass was used in the subsequent adsorptiondesorption cycles. The experimental results demonstrated that thetrametes versicolor polyporusfungi could be used as sorbent for immobilizing Cr(VI).

KINETICS OF SINGLE AND MULTIPLE METAL ION SORPTION PROCESSES ON HUMIC SUBSTANCES

Soil Science ◽  
1996 ◽  
Vol 161 (8) ◽  
pp. 509-520 ◽  
Author(s):  
X. Jin ◽  
G. W. Bailey ◽  
Y. S. Yu ◽  
A. T. Lynch
Keyword(s):  
Humic Substances ◽  
Metal Ion ◽  
Ion Sorption ◽  
Kinetics Of

scholarly journals Enzymatic Transformation and Bonding of Sulfonamide Antibiotics to Model Humic Substances

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
J. Schwarz ◽  
H. Knicker ◽  
G. E. Schaumann ◽  
S. Thiele-Bruhn
Keyword(s):  
Humic Substances ◽  
Trametes Versicolor ◽  
Agricultural Soils ◽  
Covalent Binding ◽  
Extraction Procedure ◽  
Resonance Spectroscopy ◽  
Substituted Phenols ◽  
Scanning Calorimetry ◽  
Enzymatic Transformation ◽  
Bound Residue

Sulfonamides are consumed as pharmaceutical antibiotics and reach agricultural soils with excreta used as fertilizer. Subsequently, nonextractable residues rapidly form in soil, which has been researched in a couple of studies. To further elucidate conditions, strength, and mechanisms of the fixation to soil humic substances, three selected sulfonamides were investigated using the biochemical oligomerization of substituted phenols as a model for the humification process. Catechol, guaiacol, and vanillin were enzymatically reacted using laccase fromTrametes versicolor. In the presence of the substituted phenols alone, the concentration of sulfonamides decreased. This decrease was even more pronounced when additional laccase was present. Upon the enzymatic oligomerization of the substituted phenols to a humic-like structure the sulfonamides were sorbed, transformed, sequestered, and nonextractable bound. Sulfonamides were transformed depending on their molecular properties. Fractions of different bonding strength were determined using a sequential extraction procedure. Isolated nonextractable products were analyzed by chromatographic, spectroscopic, and calorimetric methods to identify coupling and bonding mechanisms of the sulfonamides. Differential scanning calorimetry measurements suggested cross-linking of such incorporated sulfonamides in humic oligomers. Nuclear magnetic resonance spectroscopy measurements showed clear differences between the vanillin-sulfapyridine oligomer and the parent sulfapyridine indicating bound residue formation through covalent binding.

Metabolization and degradation kinetics of the urban-use pesticide fipronil by white rot fungus Trametes versicolor

2016 ◽  
Vol 18 (10) ◽  
pp. 1256-1265 ◽  
Author(s):  
Jordyn M. Wolfand ◽  
Gregory H. LeFevre ◽  
Richard G. Luthy
Keyword(s):  
Trametes Versicolor ◽  
Degradation Kinetics ◽  
Transformation Products ◽  
White Rot ◽  
White Rot Fungus ◽  
Kinetics Of

The urban-use pesticide, fipronil, is metabolized to novel transformation products by white rot fungusT. versicolor.

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