Production of pigments from the tropical marine-derived fungi Talaromyces albobiverticillius : New resources for natural red-colored metabolites

Abstract : Filamentous fungi produce many chemical classes of metabolites bound to be used in various fields of industrialapplications such as food, cosmetics, paper, textiles, medicine, biodegradation, waste remediation, etc. In thistrend, scientists are actively looking for new fungal strains synthesizing original molecules with new potenti-alities. The present study is focused on pigment production from Talaromyces albobiverticillius strains, which wererecently isolated from marine environments around Reunion Island, Indian Ocean. This study demonstrates theirability to produce a range of colored compounds exhibiting specific orange/red hues under submerged fermentation in potato dextrose broth (PDB), both seen in the mycelia and liquid medium. For the most promisingstrain, maximum levels of extracellular orange-yellow pigments (22.39 UA at 470 nm) and red pigments (18.67UA at 500 nm) were attained in 8 days with an initial pH of 5.0 at 24 °C. Among the 12 components of the colorhue, two compounds were produced in larger amounts in comparison with the total pigmented extracts (com-pound 4, red colored, presents two absorbance maxima: λ1= 422 nm, λ2= 511 nm; and compound 8, orangecolored, absorbs at λ1= 469.8 nm as a maximum). The color characteristics of the extracellular fungal products measured by L*a*b* quantitative colorimetric system indicated variations between the three strains productions,as well as between the intracellular and extracellular colored molecules produced. An evolution of the coloredcompounds synthesized is thus highlighted, in relation with the growth phases of the fungus. These resultsprovide information about the future directions towards large-scale cultivation of these fungi, which mightsupport the industrial applications of the red pigments.
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http://hal.univ-reunion.fr/hal-01865698
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Submitted on : Saturday, September 1, 2018 - 8:06:52 AM
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Mekala Venkatachalam, Hélène Magalon, Laurent Dufossé, Mireille Fouillaud. Production of pigments from the tropical marine-derived fungi Talaromyces albobiverticillius : New resources for natural red-colored metabolites. Journal of Food Composition and Analysis, Elsevier, 2018, 70, pp.35 - 48. ⟨10.1016/j.jfca.2018.03.007⟩. ⟨hal-01865698⟩

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