It was a fantastic webinar, today. I am interested in the prediction of nitrosamine formation with insilico software, Zeneth. The presenter, Rachael, explained that impurity nitrite in the acesulfame K is inevitable due to its manufacturing process. We should pay attention to such excipients.
Thank you for your feedback and question. Please find below the response from the speaker, Rachel Hemingway:
“Thank you for your kind words Yosuke, I’m glad you enjoyed the webinar. For transparency the example I showed regarding an assessment of the potential interaction between varenicline and acesulfame potassium was purely illustrative – what I mean by that, is that I don’t know that this is actually a ‘good’ pairing for a formulation in an industrial setting. However, the point around acesulfame potassium containing a nitrite impurity comes directly from data in the nitrites database i.e., at least one member of the nitrites consortium has detected nitrite in acesulfame potassium. On that basis yes, I think that where there is data for nitrite levels in excipients be that from experimental data, literature data or the nitrites database this should be a consideration when doing a nitrosamine risk assessment. I direct you to this paper for more information: A Nitrite Excipient Database: A Useful Tool to Support N-Nitrosamine Risk Assessments for Drug Products, Boetzel et al, J. Pharm. Sci., 2023, 112, 1615-1624.”
The recording and slides of the last presentation by Dr. Garry Scivens were updated. It was a fantastic webinar. He focused on the volatility of nitrite and the effect of humidity in the air on nitrosamine formation. He also demonstrated the availability of the ASAP approach for predicting long-term stability.
He approached nitrosamine formation in solid-state drug products from several scientific angles. It may look a bit complex, but it is worth looking at. I want to know more. Great Presentation!!
Thank you Yosukemino for the notification regarding dr Scrivens presentation. It is really interesting.
I remark some ingenious experimental work, fresh ideas and a few intriguing results presented on the slides.
I love the idea about studying the solid phase reactivity of the APIs, additionally to the standard NAP and IQ solution tests.
The effect of humidity on the loss of nitrite from MCC is a surprising result
The fact the API base is more reactive toward nitrosating agents is counterintuitive, as mentioned in the presentation, and against the concept that HCl in the salt form, for example, is a proton source needed to convert NO2- in active species and Cl- a catalyst. I understand that when it is about volatile nitrosating species reacting with solid API, but not when it is about MCC+API mixture.
Moreover, the results in the presence of the basic excipient MgCO3 are also intriguing. A CH2O catalyzed reaction occurs or there is only MgCO3 with high nitrite content and the free-base API present in the formulation?