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Caffeine is used here to illustrate modifier-enhanced DMS resolution in reaction-chamber DMS. Peaks are shifted and separated by the introduction of about 1% v/v isopropanol or n-propanol in the transport gas stream in the reaction chamber. The caffeine concentration (100 uM) is large, resulting in a significant cluster peak (rightmost peak). (A) no modifier, (B) 1% isopropanol, (C) 1% n-propanol. The multiple peaks with n-propanol may indicate multiple conformations.
