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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 76 (1971), S. 299-307 
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Die Bildung von flüchtigen Gärungsnebenprodukten durch Milchsäurebakterien wurde gaschromatographisch durch Analyse des Dampfraumes über den Kulturlösungen und Analyse von Ätherextrakten untersucht. Da von den meisten Substanzen nur sehr geringe Mengen gebildet werden, war es wegen des Vorkommens störender Substanzen in den Medien erforderlich, zur Kultur der Organismen synthetische Nährlösungen zu verwenden. In den Kulturlösungen der 3 homofermentativen Milchsäurebakterien Lactobacillus plantarum, Pediococcus cerevisiae und P. pentosaceus wurden nur Acetaldehyd, Acetoin, Diacetyl, sowie Spuren von 2- oder 3-Methyl-1-butanol, Isobutanol und 2 nicht identifizierte Substanzen gefunden. Bei den heterofermentativen Arten Lactobacillus brevis und Leuconostoc oenos wurde (neben Äthanol) zusätzlich die Bildung von sehr geringen Mengen von Propanol, i-Propanol, Essigsäureäthylester, n-Hexanol, 2,3-Butandiol, n-Octanol, n-Nonanol (oder Phenylacetaldehyd) und einiger weiterer Verbindungen nachgewiesen.
    Notes: Summary The formation of volatile by-products of fermentation by several strains of lactic acid bacteria was investigated by gas liquid chromatography. Since only very small amounts of volatile compounds were formed, the synthetic media used for the growth of the bacteria had to be stripped by vacuum distillation from substances interfering with the analysis. The culture solutions were analysed by gas chromatography using both the head-space-technique and extraction with ethyl ether. The homofermentative species Lactobacillus plantarum, Pediococcus pentosaceus, and P. cerevisiae were found to form small amounts of acetaldehyde, acetoin, diacetyl and traces of 2- or 3-methyl-1-butanol, isobutanol and two compounds that were not identified. In the culture solutions of the heterofermentative species L. brevis and Leuconostoc oenos a greater number of substances could be detected. These bacteria formed, besides ethanol and the products of the homofermentative organisms, small amounts of propanol, isopropanol, ethylacetate, n-hexanol, 2,3-butandiol, n-octanol and a few unidentified compounds.
    Type of Medium: Electronic Resource
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