text: There are a number of types of pulmonary surfactants available. Ex-situ measurements of surface tension and interfacial rheology can help to understand the functionality of pulmonary surfactants.
  Synthetic pulmonary surfactants
  # Colfosceril palmitate (Exosurf) - a mixture of DPPC with hexadecanol and tyloxapol added as spreading agents
  # Pumactant (Artificial Lung Expanding Compound or ALEC) - a mixture of DPPC and PG
  # KL-4 - composed of DPPC, palmitoyl-oleoyl phosphatidylglycerol, and palmitic acid, combined with a 21 amino acid synthetic peptide that mimics the structural characteristics of SP-B.
  # Venticute - DPPC, PG, palmitic acid and recombinant SP-C
  # Lucinactant - DPPC, POPG, and palmitic acid.
  Animal derived surfactants
  # Beractant
  ## (Alveofact) - extracted from cow lung lavage fluid
  ## (Survanta) - extracted from minced cow lung with additional DPPC, palmitic acid, and tripalmitin
  ##(Beraksurf) -extracted from minced calf lung with additional DPPC, palmitic acid, and tripalmitin
  # Calfactant (Infasurf) - extracted from calf lung lavage fluid
  # Poractant alfa (Curosurf) - extracted from material derived from minced pig lung
  # Ovinactant (Varasurf) - extracted from material derived from minced sheep lung