Abstract
Purpose. The purpose of this study was to investigate the utility of a purified, semisynthetic saponin, DS-1, prepared by deacylation of a naturally occurring saponin from the bark of the Quillaja saponaria Molina tree, as a permeation enhancer for mucosal delivery of the aminoglycosides, gentamicin and tobramycin.
Methods. Gentamicin or tobramycin formulations, with and without DS-1, were administered to rats nasally, ocularly, and rectally. Serum aminoglycoside levels following mucosal application were compared with those administered intramuscularly. Gentamicin formulations, with and without DS-1, were administered intranasally to mice 60 minutes after a lethal bacterial challenge. To ascertain nasal irritation potential, DS-1 nosedrops were administered to rats twice daily for 7 days in the right nostril only. Comparison of the left (internal control) and right nostril was made with a control group that received only buffer.
Results. Significant transport across mucous membranes was only observed in formulations containing DS-1. This effect on drug delivery was transient. Administration of an intranasal gentamicin/ DS-1 formulation reversed the lethal bacterial challenge in mice, demonstrating that biological activity was retained after absorption. Nasal irritation was not observed in groups receiving DS-1 nose-drops, which were identical to control groups.
Conclusions. DS-1 has potential as a transmucosal delivery agent for the aminoglycoside antibiotics.
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Recchia, J., Lurantos, M.H.A., Amsden, J.A. et al. A Semisynthetic Quillaja Saponin as a Drug Delivery Agent for Aminoglycoside Antibiotics. Pharm Res 12, 1917–1923 (1995). https://doi.org/10.1023/A:1016235705448
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DOI: https://doi.org/10.1023/A:1016235705448