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JSIR Vol.66 [2007] >
JSIR Vol.66(08) [August 2007] >
| Title: | Production of an antioxidant naphthoquinone pigment by Comamonas testosteroni during growth on naphthalene |
| Authors: | Patel, K C
Patel, M A
Chauhan, Kishor
Anto, Hema
Trivedi, Ujjval |
| Keywords: | Antioxidant
FRAP assay
Naphthalene
Naphthoquinone
Red pigment |
| Issue Date: | Aug-2007 |
| Publisher: | CSIR |
| Abstract: | A cell bound red pigment was synthesized by an indigenous petroleum contaminated soil isolate, Comamonas testosteroni,
during growth on naphthalene as a sole source of carbon and energy. Ferric ion supplementation in the medium inhibited the
pigment production. UV-visible spectrum of the pigment in ethanol showed absorption maxima at 251, 289, 318, 328, 333 and
362 nm and a broad peak at 479 nm. Ethanolic solution of pigment showed development of crystals on storage. Chemical
analysis, FTIR and NMR spectroscopy studies revealed it as a novel isoprenoid quinone, a 2-methyl naphthoquinone with
phytyl side chain. Ferric reducing/antioxidant power assay proved its in vitro antioxidant activity. Both pigment and ferric ions
are proposed to have protective role against superoxide radical generated through intense activity of flavin containing naphthalene
dioxygenase during naphthalene metabolism. |
| Page(s): | 605-610 |
| ISSN: | 0022-4456 |
| Source: | JSIR Vol.66(08) [August 2007]
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