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. 1984 Sep;159(3):900–904. doi: 10.1128/jb.159.3.900-904.1984

Heterogeneity of lipid A: comparison of lipid A types from different gram-negative bacteria.

I Mattsby-Baltzer, P Gemski, C R Alving
PMCID: PMC215744  PMID: 6384185

Abstract

Chloroform-soluble purified lipid A preparations from 10 sources, including five Escherichia coli strains (EH100, K-12, O127, O111, RCDC), two Salmonella strains (Salmonella typhimurium, Salmonella minnesota R595), Shigella sonnei II, and a hybrid of Shigella flexneri and E. coli K-12, were compared with lipid A from S. flexneri. Purified lipid A from S. flexneri was earlier found to be composed of eight fractions. The various lipid A preparations were assayed by thin-layer chromatography. Chromatograms were stained for phosphate or carbohydrate by molybdenum blue or orcinol, respectively. The number of major bands found for each lipid A preparation varied between 7 and 10, depending on the source. Comparable bands, based on Rf, were found among all of the different lipid A preparations, but the quantity of each band varied between the sources of lipid A. Four bands (designated 2, 3, 7, and 8) were abundant in every preparation. Variations of conditions used for preparing lipid A, such as changing of hydrolysis time, did not affect the appearance of lipid A on thin-layer chromatography. Change in the type of acid used for hydrolysis also did not affect the band pattern, but it did change the quantitative amounts of the various bands to some degree.

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Selected References

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