JOURNAL ARTICLE
VALIDATION STUDIES
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Attenuated Total Reflectance Fourier Transformation Infrared spectroscopy fingerprinted online monitoring of the kinetics of circulating Butyrylcholinesterase enzyme during metabolism of bambuterol.

We have described a continuous flow ATR-FTIR method for measuring some of the Butyrylcholinesterase enzyme kinetics (Km and Vmax ). This is done by developing a circulating system to be close as much as possible to the human circulation using human serum as a source of the enzyme with adjusted pH, isotonicity and temperature to give the maximum affinity of the enzyme towards its substrate (bambuterol). The experiment was running continuously for 90 min to monitor the production of terbutaline from the zero time of its appearance with a measured spectrum in each minute using ZnSe prism. The method was selective and successful for determination of Vmax to be 8.16 × 10-8  mol/min/ml and Km to be 2.28 × 10-5  mol, showing high affinity of the enzyme towards its prodrug substrate Bambuterol. This study critically probes the quantitative ability of the ATR-FTIR method for terbutaline, which was validated according to ICH guidelines showing high accuracy 100.39% and high selectivity towards the produced terbutaline, as the produced spectrums considered as fingerprint of each compound.

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