Abstract
Recently, vast efforts towards sustainability have been made in the pharmaceutical industry. In conventional oil-in-water (O/W) cream formulations, various petroleum-based excipients, namely mineral oil and petrolatum, are commonly used. Natural or synthetic excipients, derived from vegetable sources, were explored as alternatives to petroleum-based excipients in prototype topical creams, with 1% (w/w) lidocaine. A conventional cream comprised of petroleum-derived excipients was compared to creams containing sustainable excipients in terms of key quality and performance attributes, physicochemical properties, and formulation performance. The petrolatum-based control formulation had the highest viscosity of 248.0 Pa·s, a melting point of 42.7°C, a low separation index at 25°C of 0.031, and an IVRT flux of 52.9 µg/cm2/h. Formulation SUS-4 was the least viscous formulation at 86.9 Pa·s, had the lowest melting point of 33.6°C, the highest separation index of 0.120, and the highest IVRT flux of 139.4 µg/cm2/h. Alternatively, SUS-5 had a higher viscosity of 131.3 Pa·s, a melting point of 43.6°C, a low separation index of 0.046, and the lowest IVRT flux of 25.2 µg/cm2/h. The cumulative drug permeation after 12 h from SUS-4, SUS-5, and the control were 126.2 µg/cm2, 113.8 µg/cm2, and 108.1 µg/cm2, respectively. The composition of the oil-in-water creams had influence on physicochemical properties and drug release; however, skin permeation was not impacted. Sustainable natural or synthetic excipients in topical cream formulations were found to be suitable alternatives to petroleum-based excipients with comparable key quality attributes and performance attributes and should be considered during formulation development.
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Acknowledgements
The authors would like to acknowledge David Nieto, a former Pfizer Summer Student worker 2021, that established correlations between sensorial attributes and instrumental measurements for topical cream formulations.
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This work was funded by Pfizer Inc.
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Conceptualization: Gates and Badruddoza; data curation: Gates, Zahid, and Walsh; formal analysis: Gates and Badruddoza; funding acquisition: Gates and Badruddoza; investigation: Gates and Badruddoza; methodology: Gates, Badruddoza, Yeoh, and Zahid; project administration: Gates and Badruddoza; resources and supervision: Nurunnabi, Shah, Yeoh; visualization: Gates and Walsh; roles/writing original draft: Gates and Zahid; and writing—review and editing: Gates, Badruddoza, and Shah
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Gates, D., Badruddoza, A.Z.M., Zahid, M.I. et al. Sustainable Alternatives to Petroleum-Derived Excipients in Pharmaceutical Oil-in-Water Creams. AAPS PharmSciTech 25, 68 (2024). https://doi.org/10.1208/s12249-024-02784-z
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DOI: https://doi.org/10.1208/s12249-024-02784-z