The production and analysis of carotenoid preparations from some strains of xylotrophic Basidiomycetes


  • A. K. Velygodska Donetsk National University
  • O. V. Fedotov Donetsk National University
Keywords: antibacterial activity, antioxidant activity, surface cultivation, extraction

Abstract

The aim of the study was selection of optimal conditions for obtaining carotenoid drugs of mycelium origin from the basidiomycete strains Laetiporus sulphureus Ls-08, Fomes fomentarius Ff-1201 and Fistulina hepatica Fh-18 and the study of antibacterial and total antioxidant activity of these compounds. The strains were surface grown on a glucose-peptone medium modified for each producer. The homogenized pigments of the mycelium strains were extracted with ethanol and the solvent was separated under vacuum at 60 ºC. The absorption spectra of the carotenoid drugs were recorded for alcoholic solutions at 350–500 nm. The antibacterial activity of the carotenoids was determined by the agar diffusion method, and the total antioxidant activity was determined by the DPPH-method. It was found that the optimum temperature for carotenoid extraction is 60 °C. The absorption spectra of carotenoid drugs showed three peaks in 420, 450 and 470 nm. These results respond to the β-carotene absorption spectra. The highest antioxidant activity was noted for carotenoid drugs from F. hepatica Fh-18 and L. sulphureus Ls-08 strains obtained at an extraction temperature of 40 and 60 °C respectively. The antibacterial activity of carotenoid drugs against the test cultures was not species dependent. Carotenoid drugs with a 20% concentrate obtained from the L. sulphureus Ls-08 strain had the highest antibacterial activity against the test cultures Staphylococcus aureus and Escherichia coli. Carotenoids from the mycelium of F. hepatica Fh-18 had the highest antibacterial activity against the test culture Candida albicans. Extraction temperature of 60 °C is optimal for mycelial yield of carotenoids from the studied strains. All preparations of carotenoids exhibited antibacterial activity against the test microorganism cultures. The carotenoid drugs obtained at 40 and 60 °C from the strains F. hepatica Fh-18 and L. sulphureus Ls-08 respectively showed the highest antioxidant activity. 

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Published
2016-07-04
Section
Articles