Surfactant Function
Surfactant Function - Related Videos
09:34
Extraction and Characterization of Surfactants from Atmospheric Aerosols
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Cited by 26 •
2017
Methods are presented for the targeted extraction of surfactants present in atmospheric aerosols and the determination of their absolute concentrations and surface tension curves in water, including their Critical Micelle Concentration (CMC).
10:28
Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids
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Cited by 15 •
2014
This paper demonstrates the experimental procedure to measure terminal settling velocities of spherical particles in surfactant-based shear thinning viscoelastic fluids. Fluids over a wide range of rheological properties are prepared and settling velocities are measured for a range of particle sizes in unbounded fluids and fluids between parallel walls.
07:20
Lavage-induced Surfactant Depletion in Pigs As a Model of the Acute Respiratory Distress Syndrome (ARDS)
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Cited by 21 •
2016
Repeated pulmonary lavages in anesthetized pigs induce lung injury resembling major aspects of human acute respiratory distress syndrome (ARDS). For this purpose the lungs are repeatedly lavaged with 0.9% saline at 37 °C. The goal of the protocol is a reproducible mitigation of gas exchange and hemodynamics for research in ARDS.
06:22
Surfactant Depletion Combined with Injurious Ventilation Results in a Reproducible Model of the Acute Respiratory Distress Syndrome (ARDS)
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Cited by 5 •
2021
A combination of surfactant washout using 0.9% saline (35 mL/kg body weight, 37 °C) and high tidal volume ventilation with low PEEP to cause moderate ventilator induced lung injury (VILI) results in experimental acute respiratory distress syndrome (ARDS). This method provides a model of lung injury with low/limited recruitability to study the effect of various ventilation strategies for extended periods.
06:31
Studying Surfactant Effects on Hydrate Crystallization at Oil-Water Interfaces Using a Low-Cost Integrated Modular Peltier Device
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Cited by 2 •
2020
We present a protocol to study the formation of hydrates in the presence of nonionic surfactants on the interface of a water droplet submerged in cyclopentane. The protocol consists of building a low-cost, programmable, temperature regulator. The temperature control system is combined with visualization techniques and internal pressure measurements.
FAQs
Phospholipids form the main surface-active layer at the air–liquid interface, while associated proteins contribute to the properties and behavior of that layer. Together, these components allow pulmonary surfactant to spread across the alveolar surface and reduce surface tension. Their combined action helps maintain a stable interface as the lung repeatedly expands and contracts during breathing.
During exhalation, the alveolar surface becomes especially vulnerable to forces that favor collapse. Pulmonary surfactant lowers surface tension at this stage, helping keep alveoli open rather than allowing them to collapse. By stabilizing the air–liquid interface, it also reduces the mechanical work required for the lungs to inflate again during the next breathing cycle.
Surfactant performance depends not only on its presence but also on the composition of its phospholipids and associated proteins. If that composition is altered, the material may not stabilize the alveolar interface effectively. The resulting impairment can increase difficulty with lung inflation and interfere with efficient gas exchange, linking molecular composition to respiratory function.
Surfactant function is relevant wherever a biological surface separates or contacts different phases, such as the air and liquid present in the alveoli. Amphipathic molecules modify interactions at these boundaries, allowing a more stable interface. In biology, this provides a way to connect molecular properties with the physical behavior of tissues exposed to gases and liquids.
Investigating surfactant production and activity can show how the lung acquires and maintains the ability to support breathing. This is particularly relevant to respiratory development, because inadequate production or unsuitable composition can compromise alveolar stability and gas exchange. Such studies also help connect developmental changes in pulmonary surfactant with disease affecting newborn respiratory function.
Surfactant function provides a framework for examining why injured lungs may have impaired mechanical performance or gas exchange. Researchers can consider whether surfactant production or composition has been disrupted and how that disruption affects the alveolar interface. This context supports investigations into therapies for lung injury, while also linking treatment goals to restoration of effective surface stabilization.