Optical Density Value and Ratio as Novel Indexes for Nanoemulsion Sterile Filtration Process Control or...

Area of Science:

• Pharmaceutical Sciences
• Chemical Engineering

Background:

• Sterile filtration is crucial for removing microorganisms in nanoemulsion preparation.
• Current sterile filtration methods lack effective process control parameters.
• Existing nanoemulsion characterization techniques have limitations.

Purpose of the Study:

• To establish a simple and rapid approach for nanoemulsion sterile filtration process control.
• To utilize optical density (OD) detection as a process control parameter.
• To correlate OD with nanoemulsion content and monitor filtration integrity.

Main Methods:

• Continuous monitoring of optical density (OD) or OD ratio of the filtrate during sterile filtration.
• Exploration of the correlation between OD and nanoemulsion content.
• Determination of OD ratio for emulsion stability testing.
• Comparison of OD ratio sensitivity with particle size detection.

Main Results:

• A strong correlation was found between OD and nanoemulsion content, reducing sterile filtration loss.
• The OD ratio showed significant changes after sterile filtration, indicating its utility for monitoring leakage.
• OD ratio proved more sensitive and convenient than particle size detection for stability monitoring.

Conclusions:

• Optical density detection serves as an effective process control parameter for nanoemulsion sterile filtration.
• The OD ratio can be reliably used as a characterization index for nanoemulsion stability.
• This approach overcomes limitations of existing methods, improving process control and characterization.