Journal of Microbiology

Journal Article

A rapid and simple method for identifying bacterial polar lipid components in wet biomass: Tuan Manh Nguyen , Jaisoo Kim; J. Microbiol. 2017;55(8):635-639. Published online July 4, 2017; DOI: https://doi.org/10.1007/s12275-017-7092-1

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There are marked differences between wet and freeze-dried cells with regard to the identification of polar lipid components. The determination of the polar lipid composition of freeze-dried cells is well established. However, several approaches to identifying polar lipid components in wet cells have met with limited success owing to the presence of non-polar compounds in the extracts, resulting in a lipid composition with a narrow scope. In this study, we surveyed the lipid profiles of the wet biomasses of three Gram-positive (Microbacterium lacticum, Rhodococcus koreensis, and Streptomyces longwoodensis) and two Gram-negative (Pseudomonas aeruginosa and Novosphingobium capsulatum) bacteria; the results were comparable in quality to those obtained using a standard freeze-dried approach. Moreover, our improved method ensures simple lipid extraction. Overall, the results of the analysis showed minor lipid profile differences between the two approaches with regard to quantity, and lipid identification was consistent in both methods for all species.

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Analysis of cellular fatty acid methyl esters (FAMEs) for the identification of leuconostoc strains isolated from kimchi: Lee, Jung Sook , Chun, Chang Ouk , Kim, hong Joong , Joo, Yun Jung , Lee, Hun Joo , Park, Chan Sun , Ahn, Jong Seog , Park, Yong Ha , Mheen, Tae Ickc; J. Microbiol. 1996;34(3):225-228.

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Abstract: The cellular fatty acid methyl esters (FAMEs) analysis data obtained for clusters defined at a Euclidian distance of 17.5, in the classification of lactic acid bacteria isolated from kimchi, described by Lee et al. (4), was used for the identification of 79 Leuconostoc isolates. The test strains were isolated using a selective isolation medium specific for the genus Leuconostoc. These strains were then characterized according to their fatty acid profiles. The results show that all seventy nine test strains were identified to the known Leucomostock clusters B, C, and D. Cluster B had the highest relative amount of the saturated fatty acid 16 : 0. The saturated fatty acid 16 : 0 and summed feature 9 were found as a major components in cluster C, which had a higher level of summed feature 9 than cluster B. Cluster D is characterized by the highest relative amount of the unsaturated fatty acid 18 : 1 w9c. It is suggested that FAMEs analysis can be successfully applied in the identification of lactic acid bacteria isolated from kimchi.

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