Contamination in HPLC quantified benzaldehyde is from polypropylene microtubes.

Area of Science:

• Biochemistry
• Enzymology
• Vascular Biology

Background:

• Semicarbazide-sensitive amine oxidase (SSAO) is a copper-containing enzyme found in vascular smooth muscle cells.
• SSAO deaminates primary amines, producing aldehydes and peroxides, potentially contributing to vascular damage.
• Accurate quantification of SSAO activity is crucial for understanding its role in vascular health.

Purpose of the Study:

• To investigate a source of high background benzaldehyde levels observed during SSAO activity assays.
• To evaluate the impact of different vial materials on assay accuracy.
• To recommend optimal conditions for reliable SSAO activity measurement.

Main Methods:

• SSAO activity was quantified by measuring benzaldehyde production.
• Fluorescent derivatization and High-Performance Liquid Chromatography (HPLC) were employed for analysis.
• Derivatization was performed in both polypropylene and borosilicate glass tubes at 95°C for 45 minutes.

Main Results:

• One batch of polypropylene vials exhibited significant background benzaldehyde, interfering with SSAO assay results.
• Borosilicate glass vials did not show this contamination issue.
• Contamination was not linked to shipping, handling, or assay reagents, suggesting a manufacturing-related issue.

Conclusions:

• Variations in the commercial production of polypropylene vials can introduce contaminants affecting biochemical assays.
• Borosilicate glass vials are a reliable alternative for aldehyde production assays.
• Using borosilicate vials is recommended to ensure accurate SSAO activity measurements.