The electroreductions of NAD and NADP coenzymes have been studied in acidic media (5 M H,SO, to pH = 2) by DP and dc polarography. Tafel slopes and reaction orders were obtained from i-E curves traced at potentials corresponding to the foot of the polarographic waves. The results show that, at very
A note on the mechanism of electroreduction of isoniazid in acidic media
✍ Scribed by José Miguel Rodríguez Mellado; Rafael Marín Galvín
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 162 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0013-4686
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✦ Synopsis
Ahstraet-The electroreduction of isoniazid was studied at pH < 6. On the basis of polarographic and voltammetric measurements and by regarding the Tafel slopes and reaction orders, it was concluded that in a very strongly acidic medium the rate-determining step of the process is the loss of an ammonia molecule to yield isonicotinamide, whereas at pH > 2 the process is controlled by the second onaelectron transfer, which is irreversible.
📜 SIMILAR VOLUMES
The polarographic reduction of uranyl ion in nitric acid solution are found to be one electron reduction mechanism at lower acid concentration (0.1 M HNO,) and two electron mechanism at high acid concentration (2 M HNO,). Methanol shifted the half wave potentials to more negative values and increase