Separation and quantification of muropeptides with high-performance liquid chromatography
- PMID: 3056100
- DOI: 10.1016/0003-2697(88)90468-x
Separation and quantification of muropeptides with high-performance liquid chromatography
Abstract
About 80 different muropeptides, the subunits which comprise the polymer murein of Escherichia coli, were resolved by high-performance liquid chromatography. The muropeptides were released from isolated murein by complete digestion with muramidase from Chalaropsis spec. The separation method is based on reversed phase chromatography of the sodium borohydride-reduced compounds using ODS (C18) columns and a linear gradient elution with sodium phosphate buffer and methanol as organic modifier. The effect of temperature, pH, ionic strength, and the steepness of the gradient and of different support materials on the separation of the muropeptides was investigated. The new method represents a major improvement over previous methods with respect to resolution, sensitivity, and speed. Analytical as well as preparative separations can be realized. Quantitative analysis of murein composition is achieved by a linear gradient from 50 mM sodium phosphate, pH 4.31, to 75 mM sodium phosphate, pH 4.95, containing 15% methanol for 135 min on a 250 X 4.6 mm 3-micron Hypersil ODS column at 55 degrees C using a flow rate of 0.5 ml/min. With uv detection at 205 nm about 20 micrograms of murein per analysis is sufficient. The detection limit per compound is about 5 ng. A method for the evaluation of the analytical data allowing a convenient comparison of different muropeptide pattern is described.
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