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Voltammetry of Several Natural and Synthetic Opioids at a Polarized Ionic Liquid Membrane
Author(s) -
Langmaier Jan,
Maier Vítězslav,
Samec Zdeněk
Publication year - 2021
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.202100701
Subject(s) - chemistry , gibbs free energy , solvation , ionic bonding , voltammetry , cyclic voltammetry , ion , thermodynamics , organic chemistry , electrochemistry , electrode , physics
Cyclic voltammetry is used to examine the transfer of the protonated forms of several natural and synthetic opioids including fentanyl and its analogs, morphine, heroin and codeine, across the polarized interface between an aqueous electrolyte solution and an ionic liquid (IL) membrane. Besides demonstrating the possibility of an amperometric detection and determination, the voltammetric measurements provide the values of the ion partition coefficients and the standard Gibbs energy of ion transfer, along with the partition coefficients for the neutral opioids, which follow the sequence corresponding to the opioid analgesic potency. A correlation between the partition coefficients for the neutral and protonated opioids points to their common basis, which is the difference between the solvation energies of the partitioned species in water and IL phase. A comparison of the experimental and theoretical values of the standard Gibbs energy of ion transfer suggests that the solvophobic interactions play a key role.