Rapid microprocedure for isolating detergent-insoluble outer membrane proteins from Haemophilus species

A rapid microprocedure for isolating detergent (sodium N-lauroyl sarcosinate)-insoluble major outer membrane proteins from Haemophilus species produced results qualitatively identical to those obtained with a commonly used preparative isolation procedure. Proteins isolated by both procedures were compared by sodium dodecyl sulfate-polyacrylamide gel electrophoresis after staining with Coomassie brilliant blue R-250. The time for outer membrane protein isolation was substantially reduced with the rapid procedure, allowing a larger number of membrane preparations to be obtained rapidly for routine analysis.