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Related Concept Videos

Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at the...
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Adrenergic stimulation generally impacts cardiac rate and rhythm. Specifically, stimulation of the β-adrenoceptors triggers an increase in intracellular calcium ion influx and pacemaker currents, which may cause arrhythmias. Catecholamines like adrenaline also demonstrate β2-adrenoceptor-mediated hypokalemia, impacting cardiac action potential and disrupting the normal cardiac rhythm. Class II antiarrhythmic drugs are β-adrenoceptor antagonists or β-blockers, which indirectly block calcium...
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β receptors are classified into three subclasses: β1, β2, and β3. β1 receptors are primarily located in the heart and kidneys. When they get activated, they increase heart rate, contractility, and renin release. This process enhances blood pressure and aids in stress management. In contrast, β2 receptors are situated mainly in the lungs, blood vessels, and skeletal muscles. Upon activation, they trigger smooth muscle relaxation, causing bronchodilation and vasodilation. This widens airways and...
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Plastic membrane electrodes responsive to beta-blocker drugs.

Z R Zhang1, D Yi Mao, Y X Li

  • 1Department of Chemistry, Shanghai Teacher's University, 10 Guilin Road, Shanghai, People's Republic of China.

Talanta
|July 1, 1990
PubMed
Summary

New ion-selective electrodes provide accurate detection of beta-blocker drugs like metoprolol, propranolol, and timolol. These electrodes offer reliable quantification in various solutions and pharmaceutical products.

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Area of Science:

  • Analytical Chemistry
  • Electrochemistry
  • Pharmaceutical Analysis

Background:

  • Beta-blockers, including metoprolol, propranolol, and timolol, are crucial pharmaceuticals.
  • Accurate quantification of these drugs is essential for therapeutic efficacy and patient safety.
  • Existing analytical methods may require complex sample preparation or lack specificity.

Purpose of the Study:

  • To develop and characterize novel ion-selective PVC membrane electrodes for metoprolol, propranolol, and timolol.
  • To evaluate the performance, including response linearity and selectivity, of these newly constructed electrodes.
  • To demonstrate the utility of these electrodes for direct potentiometric determination of beta-blockers in different matrices.

Main Methods:

  • Construction of ion-selective electrodes using poly(vinyl chloride) (PVC) membranes.
  • Incorporation of ion-pair complexes, specifically dinonylnaphthalenesulphonate or tetra(2-chlorophenyl)borate, as active components.
  • Performance evaluation using potentiometric measurements, including assessment of near-Nernstian responses and selectivity coefficients.

Main Results:

  • The developed electrodes exhibited near-Nernstian responses for metoprolol, propranolol, and timolol down to 10(-5)M.
  • High selectivity of the electrodes against various inorganic and organic cations was achieved.
  • Successful direct potentiometric determination of beta-blocker drugs in aqueous solutions and pharmaceutical preparations was demonstrated.

Conclusions:

  • Ion-selective PVC membrane electrodes based on specific ion-pair complexes offer a sensitive and selective method for beta-blocker analysis.
  • These electrodes provide a reliable and straightforward approach for the direct potentiometric determination of metoprolol, propranolol, and timolol.
  • The developed methodology holds promise for routine quality control and therapeutic drug monitoring.