Accelerative Solid-State Oxidation Behaviour of Amorphous and Partially Crystalline Venetoclax

Area of Science:

• Pharmaceutical Sciences
• Solid-State Chemistry
• Drug Degradation Studies

Background:

• Solid-state degradation is critical for understanding drug-excipient interactions.
• Venetoclax (VEN) stability is a key concern for its formulation and efficacy.
• Oxidative stress is a common degradation pathway for pharmaceuticals.

Purpose of the Study:

• To investigate the solid-state degradation of Venetoclax (VEN) under different oxidative stress conditions.
• To compare the stability of partially crystalline (PC-VEN) and amorphous (A-VEN) forms of VEN.
• To evaluate the suitability of Peroxydone™ complex and urea peroxide (UHP) as oxidative stress agents.

Main Methods:

• Solid-state forced degradation of VEN using Peroxydone™ complex and UHP.
• Analysis of VEN stability over 32 hours under varying temperature and crystallinity conditions.
• Identification and quantification of degradation products, including N-oxide VEN.

Main Results:

• PC-VEN exhibited greater stability with Peroxydone™, while A-VEN was more stable with UHP.
• The formation of N-oxide VEN, a key degradation product, differed significantly between the two oxidative stress conditions.
• Peroxydone™ complex offered higher reproducibility and stability for impurity screening.

Conclusions:

• The solid-state stability of VEN is highly dependent on the specific oxidative stressor and the drug's crystalline form.
• Understanding these differential degradation pathways is crucial for predicting excipient incompatibilities.
• Peroxydone™ complex is a promising tool for assessing solid-state oxidative stability and impurity profiles.