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Studies from Vienna University of Technology Add New Findings in the Area of Biological Pigments

May 20, 2014

By a News Reporter-Staff News Editor at Life Science Weekly -- Investigators discuss new findings in Biological Factors. According to news originating from Vienna, Austria, by NewsRx correspondents, research stated, "Extreme halophilic archaea are a yet unexploited source of natural carotenoids. At elevated salinities, however, material corrosivity issues occur and the performance of analytical methods is strongly affected."

Our news journalists obtained a quote from the research from the Vienna University of Technology, "The goal of this study was to develop a method for identification and downstream processing of potentially valuable bioproducts produced by archaea. To circumvent extreme salinities during analysis, a direct sample preparation method was established to selectively extract both the polar and the nonpolar lipid contents of extreme halophiles with hexane, acetone and the mixture of MeOH/MTBE/water, respectively. Halogenated solvents, as used in conventional extraction methods, were omitted because of environmental considerations and potential process scale-up. The HPLC-MS/MS method using atmospheric pressure chemical ionization was developed and tuned with three commercially available C-40 carotenoid standards, covering the wide polarity range of natural carotenoids, containing different number of OH-groups. The chromatographic separation was achieved on a C-30 RP-HPLC column with a MeOH/MTBE/water gradient. Polar lipids, the geometric isomers of the C-50 carotenoid bacterioruberin, and vitamin MK-8 were the most valuable products found in bioreactor samples. In contrast to literature on shake flask cultivations, no anhydrous analogues of bacterioruberin, as by-products of the carotenoid biosynthesis, were detected in bioreactor samples. This study demonstrates the importance of sample preparation and the applicability of HPLC-MS/MS methods on real samples from extreme halophilic strains."

According to the news editors, the research concluded: "Furthermore, from a biotechnological point-of-view, this study would like to reveal the relevance of using controlled and defined bioreactor cultivations instead of shake flask cultures in the early stage of potential bioproduct profiling."

For more information on this research see: Identification of lipophilic bioproduct portfolio from bioreactor samples of extreme halophilic archaea with HPLC-MS/MS. Analytical and Bioanalytical Chemistry, 2014;406(9-10):2421-2432. Analytical and Bioanalytical Chemistry can be contacted at: Springer Heidelberg, Tiergartenstrasse 17, D-69121 Heidelberg, Germany. (Springer -; Analytical and Bioanalytical Chemistry -

The news correspondents report that additional information may be obtained from B. Lorantfy, Vienna Univ Technol, Inst Chem Technol & Analyt, A-1060 Vienna, Austria. Additional authors for this research include T. Renkecz, C. Koch, G. Horvai, B. Lendl and C. Herwig (see also Biological Factors).

Keywords for this news article include: Vienna, Europe, Austria, Polyenes, Terpenes, Carotenoids, Cyclohexenes, Hydrocarbons, Cycloparaffins, Organic Chemicals, Biological Factors, Biological Pigments

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Source: Life Science Weekly

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