alexa Nafronyl ion-selective membrane electrodes and their use in pharmaceutical analysis.
Engineering

Engineering

Journal of Biosensors & Bioelectronics

Author(s): Ionescu MS, Badea V, Baiulescu GE, Coofre VV

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Abstract A simple potentiometric method is described for the rapid determination of nafronyl-drugs in pharmaceutical preparations such as tablets. Nafronyl ion-selective membrane electrodes with either the nafronyl-dipicrylamine ion-pair complex in 1,2-dichloroethane or the nafronyl-dinonylnaphthalenesulphonic acid ion-pair complex in a PVC matrix as electroactive materials were used. Both electrodes exhibit near-Nernstian responses to protonated-nafronyl activity from 10(-2) to about 10(-5)M, in pH ranges that depend on the nature of the electroactive material used in the membrane. Nafronyl in the mg-range can be determined by potentiometric titration with sodium tetraphenylborate solution, with a relative standard deviation of less than 2.0\%. No interference from any excipients in the tablets was observed.
This article was published in Talanta and referenced in Journal of Biosensors & Bioelectronics

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