Abstract
Over the past decade, electrospray mass spectrometry (ESMS) has emerged as one of the most useful analytical tools for characterising peptides and proteins. As originally conceived, it was a technique that performed best at flow rates of a few microlitres per minute. Such flow rates are significantly lower than those utilised in standard analytical [4.6-mm internal diameter (ID) column] and microbore (2.1-mm ID column) chromatography. As a result, a flurry of activity ensued on the part of mass spectrometer manufacturers in order to design electrospray (ES) interfaces that would accommodate higher flow rates.
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