Methods for detecting residues of cleaning agents during cleaning validation

Area of Science:

• Analytical Chemistry
• Pharmaceutical Science

Background:

• Cleaning validation ensures removal of cleaning agent residues to acceptable levels.
• Surfactant-based cleaning agents in diluted states pose challenges for sensitive analytical detection.
• Need for simple, rapid, and sensitive analytical methods for cleaning validation.

Purpose of the Study:

• To compare the sensitivity and practicality of four analytical methods for detecting cleaning agent residues.
• To evaluate visual foam detection, pH, conductivity, and total organic carbon (TOC) analysis.
• To determine the most effective method for various cleaning agent formulations.

Main Methods:

• Comparison of visual foam detection, pH, conductivity, and TOC analysis.
• Testing on serial dilutions of Vips Neutral, RBS-25, Debisan, and Perform cleaning agents.
• Using TOC as a reference method for evaluating other techniques.

Main Results:

• Visual foam detection identified Vips Neutral, Debisan, and Perform at concentrations as low as 10 µg/mL.
• RBS-25 required higher concentrations (200 µg/mL) for detection, likely due to low-foaming surfactants.
• TOC analysis was less sensitive but provided quantitative results; foam detection was semi-quantitative.

Conclusions:

• Visual foam detection offers high sensitivity, speed, and simplicity for analyzing common cleaning agents.
• Method sensitivity is dependent on the specific cleaning agent's formulation.
• Visual foam detection is a practical, cost-effective alternative for routine cleaning validation.