Pharmaceutical Research

, Volume 7, Issue 11, pp 1127–1133 | Cite as

Nebulization of Liposomes. I. Effects of Lipid Composition

  • Ralph W. Niven
  • Hans Schreier


A series of multilamellar liposome dispersions was prepared from lipids of soy phosphatidylcholine or hydrogenated soy phosphatidylcholine containing from 0 to 30 mol% of either cholesterol, steary-lamine, or dipalmitoyl phosphatidylglycerol. The liposome dispersions were aerosolized with a Collison nebulizer for 80 min at an output flow rate of 4.7 liters of air/min. The effects of nebulization on the vesicles were determined by monitoring the release of encapsulated 5,6-carboxyfluorescein (CF) from dispersions containing ≈200 µg of total CF, of which 93.1 ± 2.4% (N = 18) was initially encapsulated. In all experiments CF was released from the liposomes while being aerosolized, and this ranged from a mean of 12.7 ± 3.8 to 60.9 ± 1.9% of the encapsulated CF, depending upon the lipid composition. The lipid concentration in the dispersions did not affect the rate or percentage release of CF over a range of ≈0.5 to 50 mg per nebulized dispersion. If liposomes are to be used as drug carriers in an inhalation aerosol a lipid composition should be employed which will minimize the release of encapsulated drug caused by nebulization.

aerosols carboxyfluorescein liposomes multilamellar vesicles nebulizers 


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Copyright information

© Plenum Publishing Corporation 1990

Authors and Affiliations

  • Ralph W. Niven
    • 1
  • Hans Schreier
    • 1
  1. 1.Department of Pharmaceutics, College of PharmacyUniversity of FloridaGainesville

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