Polyamine-pyridoxal Schiff bases in urine

Area of Science:

• Biochemistry
• Analytical Chemistry
• Human Physiology

Background:

• Schiff bases are formed from the condensation of amines and aldehydes/ketones.
• Polyamines and their derivatives are biologically significant molecules found in various bodily fluids.
• Pyridoxal and pyridoxal phosphate are forms of Vitamin B6 involved in numerous metabolic processes.

Purpose of the Study:

• To identify and quantify Schiff bases derived from diamines and polyamines with pyridoxal or pyridoxal phosphate in human urine.
• To develop and validate analytical methods for the sensitive detection of these specific Schiff bases.

Main Methods:

• Gas chromatography/mass spectrometry (GC/MS) with selected ion monitoring was employed for detection.
• Synthetic standards were used to establish reliable analytical procedures.
• Derivatization techniques including borohydride reduction, phosphate hydrolysis, chromatographic separation, and trifluoroacetylation were utilized.

Main Results:

• Schiff bases of 1,3-diaminopropane, putrescine, cadaverine, spermidine, and spermine with pyridoxal/pyridoxal phosphate were identified in human urine.
• The developed methods enabled the conversion of these Schiff bases into stable derivatives for GC/MS analysis.
• Estimated levels of these polyamine-pyridoxal Schiff bases were found to be in the picomole per milliliter range.

Conclusions:

• The study successfully identified and quantified specific Schiff bases in human urine using advanced analytical techniques.
• The developed methodology provides a sensitive means for assessing the presence and levels of these compounds.
• The findings contribute to understanding the metabolic fate of polyamines and Vitamin B6 in humans.