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The recommended source is Sigma Aldrich, product number N7634.

Source Sigma Aldrich
Product ID N7634
Mol Weight 346.33
Purity ≥98 %
Quantity 1 g
Cost 40.6
Storage Store at +2-8 °C
Stability Nifedipine is expected to be stable for at least two years when stored at 2-8 °C. Nifedipine solutions are unstable and extremely photosensitive. Decomposition parameters of photodegradation have been reported. The compound is converted to a nitrosophenylpyridine derivative when exposed to daylight or certain wavelengths of artificial light; exposure to UV light may lead to the formation of a nitrophenylpyridine derivative. Solutions should be prepared immediately before use in the dark or under light of wavelength greater than 420 nm. Protect solutions from light and air. Studies in an electrolyte solution indicated that nifedipine degraded more rapidly at 25 °C than at 4 °C even when solutions were protected from light. The concentration declined to about 90% of the orginal value within 6 hours of preparation.

Authors of this ToxBank wiki page

David Bower
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