Comparative biophysical study of clinical surfactants using constrained drop surfactometry

Area of Science:

• Pulmonary medicine and biophysics
• Neonatal care and respiratory physiology

Background:

• Neonatal respiratory distress syndrome (RDS) is managed with surfactant replacement therapy.
• Current clinical surfactants are animal-derived (bovine or porcine), including Survanta, Infasurf, Curosurf, and Alveofact.
• Understanding the biophysical properties of these surfactants is crucial for optimizing treatment.

Purpose of the Study:

• To comprehensively examine and compare the in vitro biophysical properties of four clinical surfactant preparations.
• To correlate chemical composition, film structure, and biophysical functionality.
• To provide insights for developing more effective surfactant treatments for RDS and other respiratory conditions.

Main Methods:

• Constrained drop surfactometry (CDS) was used to assess biophysical properties.
• Physiologically relevant conditions were employed.
• Assessed properties included adsorption rate, surface activity (quasi-static and dynamic), resistance to meconium inhibition, and film morphology.

Main Results:

• Distinct in vitro biophysical properties were observed among the four surfactants.
• Survanta showed a lower adsorption rate at 1 mg/mL compared to others.
• Infasurf, Curosurf, and Survanta demonstrated excellent dynamic surface activity at 10 mg/mL, while Alveofact showed the poorest.
• Alveofact's suboptimal activity correlated with a monolayer-predominant morphology, unlike the multilayers formed by others.
• Curosurf exhibited superior resistance to meconium inhibition.

Conclusions:

• The study highlights significant differences in the biophysical behavior of animal-derived clinical surfactants.
• Correlations between composition, structure, and function provide a basis for personalized surfactant therapy.
• Findings support the development of improved and fully synthetic surfactant preparations.