@article{ijebb2015331,
author={{Ite, Aniefiok E. and Semple, Kirk T.},
title={The Effect of Flavonoids on the Microbial Mineralisation of Polycyclic Aromatic Hydrocarbons in Soil},
journal={International Journal of Environmental Bioremediation & Biodegradation},
volume={3},
number={3},
pages={66--78},
year={2015},
url={http://pubs.sciepub.com/ijebb/3/3/1},
issn={2333-8636},
abstract={The effect of flavonoids (flavone, morin hydrate and 3-hydroxyflavone)on the microbial mineralisation of polycyclic aromatic hydrocarbons (PAHs) in soil slurry by the indigenous microbial communities has been investigated. The rates and extents of <SUP>14</SUP>C每PAHs (<SUP>14</SUP>C每naphthalene, <SUP>14</SUP>C每phenanthrene and <SUP>14</SUP>C每pyrene)mineralisation in artificially spiked soils were monitored in the absence and presence of flavonoids applied at three different concentrations (50, 100 and 200 米g kg<SUP>-1</SUP>) either as single compounds or as a mixture of flavonoids (flavone, morin hydrate and 3-hydroxyflavone at a 1:1:1 ratio). Respirometric and microbial assays were monitored in fresh (0 d) and pre每incubated (28 d) artificially spiked soils following amendment with flavonoids. The highest extents of<SUP>14</SUP>C每naphthalene, <SUP>14</SUP>C每phenanthrene and <SUP>14</SUP>C每pyrenemineralisation (<i>P</i>&lt; 0.001) were obtained in fresh artificially spiked soils amended with 100 米g kg<SUP>-1</SUP>3-hydroxyflavonecompared to those obtained in unamended soils. However, amendment of fresh artificially spiked soils with higher concentrations of morin hydrate (≡ 100 米g kg<SUP>-1</SUP>) inhibited mineralisation of<SUP>14</SUP>C每pyrene by indigenous microbial communities.Apart from naphthalene and pyrene spiked soils amended with morin hydrate, pre每incubated artificially spiked soils amended with 100 米g kg<SUP>-1</SUP><SUP> </SUP>flavonoids had the highest extents of microbial mineralisation of PAHs compared to those obtained in unamended soils. The results obtained showed enhanced microbial mineralisation of <SUP>14</SUP>C每PAHs in fresh artificially spiked soils amended with 50 每 100 米g kg<SUP>-1 </SUP>flavonoidsand in addition, low molecular weight PAHs (containing &lt; 4 aromatic rings) exhibited higher extents of microbial mineralisation compared to high molecular weight PAH.Depending on its (bio) available concentration and solubility in soil, flavonoids can either stimulate or inhibit mineralisation of PAHs by indigenous soil microbial communities. This study suggests that phytochemical每microbe interactions are essential drivers of ecosystem functions relevant for the biodegradation of petroleum每derived or organic contaminants in soils.},
doi={10.12691/ijebb-3-3-1}
publisher={Science and Education Publishing}
}