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Title
Lignin as a carbon source for the cultivation of some Rhodotorula species
Authors
ANCA ROXANA HAINAL ADINA MIRELA CAPRARU IRINA VOLF and VALENTIN I. POPA
Received
May 6, 2011
Published
Volume 46 Issue 1-2 January-February
Keywords
Rhodotorula spp., lignin, biomass, carotenoid pigments, FTIR spectroscopy
Abstract
The paper presents the results obtained in the cultivation of two strains of Rhodotorula spp. yeast producing carotenoid pigments, in a medium with different lignin concentrations. Lignins separated from wheat straw (L1) and from Sarkanda grass (L2), provided by Granit Recherche Développement SA, Lausanne, Switzerland, were used for the study. The evolution of yeasts in the culture media in which lignins represented the carbon source was observed as to wet biomass yield, pH and content of carotenoid pigments. At the end of the cultivation process, the residual lignin was recovered by precipitation and subjected to FTIR spectroscopic investigations, to highlight the structural changes caused by these microorganisms. It was found out that biomass yield and carotenoid pigment biosynthesis were influenced by the presence of lignins, which were deeply modified from a structural point of view.
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