Abstract
The aim of this work was to compare the production of carotenes and ergosterol by red yeasts grown on pine lignocellulose substrates. The yeast strains Rhodotorula aurantiaca and Sporobolomyces shibatanus were grown on the liquid fraction of steam pretreated pine (210 °C, catalyst SO2). Biomass production on a pine hydrolysate was lower than on glucose. The highest content of carotenoids and ergosterol in the cells of R. aurantiaca grown on pine hydrolysate was about 1.7 mg g-1 and 0.8 mg g-1 (dwt), respectively, and in S. shibatanus about 0.9 mg g-1 and 0.1 mg g-1, respectively. Hemicellulose hydrolysates may contain many compounds that have inhibitory effects on microorganisms. In this work, the influences of some inhibitors were assessed by cultivating yeasts on media with a representative addition of the selected compounds. From these tests, furfural appears to be the most critical inhibitor, whereas acetic acid and 5-hydroxymethyl furfural (HMF) do not affect the growth so much. (Less)
Highlights
Carotenoids, such as unsaturated isoprene derivates, are the most distributed class of pigments in nature with orange, yellow or red colour
Media with different ratios of hydrolysate and glucose were used for cultivation of these yeasts
The effect of adaptation of the yeast to the medium containing pine hydrolysate was investigated by comparing cultivations with yeasts pregrown on synthetic medium and with yeasts pregrown on a medium containing hydrolysate
Summary
Carotenoids, such as unsaturated isoprene derivates, are the most distributed class of pigments in nature with orange, yellow or red colour. These pigments have a wide range of industrial applications. They provide attractive colour and antioxidant activity in food products, and some pigments act as vitamin A precursors in food and animal feed. Β-carotene has specific functions, such as photoprotection by light absorbing capacity, and acts as a precursor of vitamin A and specific hormones. It reduces cell damage[4]
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