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This study presents the  in vivo  electrochemical monitoring of pH using boron doped diamond (BDD) microelectrode and silver needles for potential application in medical diagnosis. Accurate calibration curve for pH determination were obtained through  in vitro  electrochemical measurements. The increase induced in stomach pH by treatment with pantoprazole was used to demonstrate that it is possible to monitor the pH  in vivo  using the simple and noninvasive system proposed herein. Using the results of the  in vivo  and  in vitro  experiments, a quantitative analysis of the increase in stomach pH is also presented. It is proposed that the catheter-free pH monitoring system presented in this study could be potentially employed in any biological environment.

In vivo pH monitoring using boron doped diamond microelectrode and silver needles: Application to stomach disorder diagnosis