Abstract
Suspension-based matrix transdermal delivery systems (TDSs) are specialized systems that maintain a continuous driving force for drug delivery over prolonged wear. The pressure-sensitive adhesive (PSA) is the most critical constituent of such systems. Our study aimed to determine the effect of different mixing methods on the performance of silicone PSA-based suspension TDSs. Lidocaine suspension TDSs were prepared using conventional slow rotary mixing, high-speed homogenization, bead-mill homogenization, vortex shaking, and by an unguator. Resultant TDSs were tested for tack, shear, and peel properties and correlated to coat weight, content uniformity, microstructure, and in vitro permeation across dermatomed human skin. Every mixing method tested caused a significant reduction in peel. However, bead-mill homogenization resulted in significant loss of all adhesive properties tested, while unguator-mixed TDSs retained most properties. Good linear correlation (R2 = 1.000) between the shear properties of the TDSs with the average cumulative amount of lidocaine permeated after 24 h was observed, with no significant difference between percutaneous delivery from slow rotary-mixed systems (1334 ± 59.21 μg/cm2) and unguator-mixed systems (1147 ± 108.3 μg/cm2). However, significantly lower delivery from bead-mill homogenized systems (821.1 ± 28.00 μg/cm2) was noted. While many factors affect TDS performance, careful consideration must also be given to the processing parameters during development as they have been shown to affect the resultant system’s therapeutic efficacy. Extensive mixing with bead-mill homogenization demonstrated crystallization of drug, loss in adhesive properties, coat weight, and film thickness, with reduced transdermal delivery of lidocaine from the prepared system.
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Sonalika Arup Bhattaccharjee—conceptualization, data curation, formal analysis, investigation, methodology, writing (original draft preparation, review and editing), and visualization. Madhura Kale—investigation. Ngan Le—investigation. Ajay K. Banga—conceptualization, resources, supervision, and writing (review and editing).
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Bhattaccharjee, S.A., Kale, M., Le, N. et al. Impact of Different Mixing Methods on the Performance of Suspension-Based Transdermal Delivery Systems. AAPS PharmSciTech 22, 150 (2021). https://doi.org/10.1208/s12249-021-02022-w
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DOI: https://doi.org/10.1208/s12249-021-02022-w