Screening Methodologies for the Development of Spray-Dried ASDs

Pharmaceutical Research, August 2014

Purpose

To present a new screening methodology intended to be used in the early development of spray-dried amorphous solid dispersions.

Methods

A model that combines thermodynamic, kinetic and manufacturing considerations was implemented to obtain estimates of the miscibility and phase behavior of different itraconazole-based solid dispersions. Additionally, a small-scale solvent casting protocol was developed to enable a fast assessment on the amorphous stability of the different drug-polymer systems. Then, solid dispersions at predefined drug loads were produced in a lab-scale spray dryer for powder characterization and comparison of the results generated by the model and solvent cast samples.

Results

The results obtained with the model enabled the ranking of the polymers from a miscibility standpoint. Such ranking was consistent with the experimental data obtained by solvent casting and spray drying. Moreover, the range of optimal drug load determined by the model was as well consistent with the experimental results.

Conclusions

The screening methodology presented in this work showed that a set of amorphous formulation candidates can be assessed in a computer model, enabling not only the determination of the most suitable polymers, but also of the optimal drug load range to be tested in laboratory experiments. The set of formulation candidates can then be further fine-tuned with solvent casting experiments using a small amount of API, which will then provide the decision for the final candidate formulations to be assessed in spray drying experiments.

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In an interview with Executiva, a portuguese media outlet focused on women´s leadership, Diane Villax, co-founder and long-standing leader of Hovione, reflects on her journey and the company’s development over more than six decades. Diane Villax’s career began at a time when few women worked outside the home. At 19, she joined a trading company as a foreign languages correspondent, where she developed essential business skills — including commercial correspondence, banking and export procedures — that later proved instrumental in helping her husband, Ivan Villax, establish Hovione in 1959. From its earliest days operating in the family home in Lisbon, Hovione adopted an international outlook. The company’s first major customers were in Japan, setting demanding quality standards that helped shape its long-term position in global markets. Over the following decades, Hovione expanded its footprint with the construction of its first manufacturing site in Loures (1969), followed by expansion to Macau (1986), the United States (New Jersey, early 2000s) and Ireland (Cork). The company grew into a global organization with more than 2,500 employees — including over 300 scientists — and a reputation as a preferred supplier to leading pharmaceutical companies worldwide. Throughout the interview, Diane highlights the values that have guided the company’s development: a commitment to excellence, a strong work ethic, and a focus on quality and long-term relationships. Although she did not have formal business training, she learned “on the job” and brought discipline, precision and structure to her role — particularly in the company’s early financial and administrative leadership. Now in her nineties and an active member of Hovione’s Board of Directors, Diane Villax remains engaged with the company’s evolution and governance, reflecting a continued commitment to its long-term development. Her story reflects entrepreneurial drive, resilience and long-term leadership — and offers insight into the values that have shaped Hovione’s trajectory for more than six decades. Read the full interview at Executiva.pt (in portuguese).

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Executiva, 23 February 2026