[Determination of hydroxyproline in rat kidney tissue by HPLC with pre-column derivatization].

Objective: To establish a pre-column derivatization HPLC method for quantitation of hydroxyproline (Hyp) in rat kidney tissue by reversed-phase assay.

Methods: Rat kidney samples were hydrolyzed in 6 mol x L⁻¹ HCl under 110 degree for 24 h, then 9-fluorenylmethyl chloroformate (FMOC) was added for the pre-column reaction. The HPLC analysis was performed on a Phenomenex C₁₈ column using sodium acetate buffer, methanol and acetonitrile as mobile phase with a flow rate of 1.