Determination of polyamines in human urine by precolumn derivatization with benzoyl chloride and high-performance liquid chromatography coupled with Q-time-of-flight mass spectrometry.

A simple and sensitive HPLC/Q-TOF MS method for simultaneous determination of 1,3-diaminopropane, putrescine, cadaverine, spermidine, spermine and acetyl-spermine in human urine was developed in electrospray-ionization source by positive ion mode. The samples were firstly pretreated by 10% HClO(4) and then derivatized by benzoyl chloride with 1,6-diaminohexane as internal standard. The derived polyamines were separated on a C(18) column by a gradient elution with methanol-water, and then sensitively detected with Q-TOF MS. The limits of detection for polyamines ranged from 0.02 to 1.0 ng ml(-1) with excellent linearity within the range from 1 to 1000 ng ml(-1) except acetyl-spermine from 5 to 1000 ng ml(-1). The intra- and inter-day R.S.D. for all polyamines were 2.0-14.7% and 3.9-12.9%, respectively. The method was applied to determine the polyamines in human urine from 10 cancer patients and 15 healthy volunteers. Results showed that the mean levels of polyamines in urine of patients were all higher than those in healthy volunteers. The cluster analysis was used to establish the distinction mode between cancer sufferers and healthy individuals.