Quantification of oil/water emulsion stability kinetics using image analysis: ImageScan method.

Area of Science:

• Physical Chemistry
• Colloid and Surface Science

Background:

• Emulsion stability is crucial in various industries, requiring accurate and efficient assessment methods.
• Traditional methods for evaluating emulsion stability can be time-consuming and costly.

Purpose of the Study:

• To develop and validate a kinetic, cost-effective, image-based method (ImageScan) for quantifying oil-in-water (O/W) emulsion stability.
• To establish ImageScan as a reliable tool for determining emulsion half-life time (HLT).

Main Methods:

• Oil-in-water emulsions were prepared using commercial emulsifiers.
• Images were captured using a desktop scanner over time.
• The Image Stability Index (ISI) was calculated from the relative gravitational volume (rGV), and half-life time (HLT_i) was determined using the ImageScan^EM program.

Main Results:

• The ImageScan method demonstrated a strong correlation (r = 0.9019, p < 0.05) with traditional kinetic and turbidimetric methods (HLT_t).
• Bland-Altman analysis showed a 95% agreement limit between HLT_i and HLT_t values.
• The method effectively quantifies and identifies instability layers in emulsions.

Conclusions:

• The ImageScan method provides a validated, kinetic, and cost-effective approach for assessing O/W emulsion stability.
• ImageScan facilitates accurate quantification and identification of emulsion instability.
• This technique offers a valuable alternative for routine emulsion stability testing.