Polyacrylamide gel electrophoresis and infrared spectroscopy of vibrio biotypes.

Polyacrylamide gel electrophoresis and infrared spectroscopy were used to study the relationship between Vibrio cholerae (classical), Vibrio cholerae (El Tor), and nonagglutinable (NAG) vibrios. Acid extracts of the different strains produced type-specific electrophoretic patterns, and the infrared spectra revealed broad absorption maxima which largely correspond to those found in other organisms. With the exception of the NAG vibrios, the infrared spectra of cholera El Tor vibrios were identical. Strain-specific differences were found in the exoprotein spectra of these organisms by the sodium dodecyl sulphate - polyacrylamide gel electrophoretic technique.