Capillary and nano-LC/MS/MS
NanoESI MS can be coupled to high performance liquid chromatography (HPLC)
using a variety of sizes of liquid chromatographs. We have maximized the sensitivity
of the QSTART XL by performing chromatographic separations on a UltimateT nano-
HPLC, from Dionex/LC Packings. A relatively large volume of sample (1-25 l) can
then be loaded onto an appropriate reverse-phase column (e.g., C8, C18) that can
be separated into its various component parts by eluting with a gradient at 100-2000
nl/min. This reduces sample preparation time and loss during analysis. Examples
whereby this could enhance the information gathered includes an enzymatic digest
of protein that can be analyzed by LC/MS for peptide mapping/sequencing. LC/MS
can be used for the quantitative analysis of trace samples including metabolites or
contaminants. LC/MS/MS is almost the best method available to study
pharmacokinetics, the fate of drugs, pesticides and insecticides. Not only can it
quantitate the amount of specimen in a mixture but also elucidate the structures of
the specimen. Furthermore, 2D chromatographic methodology utilizing the multiple
micro-valves integrated into the UlimateT have improved proteomic analysis of
complex mixtures. Information-dependent acquisition (IDAT) allows for on-the-fly
MS/MS based on switching criteria as desired greatly increasing the amount and
types of data obtained including specific peptide information in a mixture or targeted
modifications.
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