Application of high performance liquid chromatography combined with diode‐array detection for analysis of proteins and peptides in human cerebrospinal fluid

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Abstract
Different strategies for HPLC separation, including molecular sieving, ion‐exchange, and hydrophobic interaction as well as reversed phase chromatography, were used to study molecular components in human cerebrospinal fluid (CSF). The separations were followed by photodiode‐array UV detection, which is a recently developed technique allowing a direct and rapid discrimination between peptides and proteins differing in their content of aromatic amino acids. By the various HPLC techniques in conjunction with diode‐array detection it was possible to identify and characterize several protein and peptide components present in CSF. The procedure also allowed quantitative analysis of CSF proteins using minute amounts of the fluid.