A multivariate method to predict the water vapour diffusion rate through polypropylene packaging.

Area of Science:

• Pharmaceutical Sciences
• Materials Science
• Chemical Engineering

Background:

• Semipermeable containers, like polypropylene, allow water diffusion during storage.
• Understanding water diffusion is crucial for predicting the shelf-life of pharmaceutical products.
• X-ray and MR contrast agents are widely used and stored in such containers.

Purpose of the Study:

• To develop a mathematical method for estimating water diffusion rate constants through polypropylene.
• To assess the impact of various factors on diffusion rates and predict product shelf-life.
• To provide an early-stage stability assessment tool for contrast agents.

Main Methods:

• Evaluation of water diffusion rates for Visipaque (X-ray) and Omniscan (MR) contrast agents.
• Development of a mathematical model using partial least squares regression.
• Analysis of variables including temperature, humidity, surface area, wall thickness, concentration, and fill volume.

Main Results:

• A predictive model with good cross-validated ability (r = 0.99) was developed for both contrast agents.
• The model effectively estimated the logarithmic rate constant for water diffusion.
• The influence of key variables on diffusion was quantified.

Conclusions:

• The developed mathematical method enables accurate prediction of water diffusion rates in contrast agent packaging.
• This approach facilitates early-stage shelf-life prediction under various environmental conditions.
• The findings support enhanced product stability assessment and formulation development.