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Properties of Enantiomers and Optical Activity02:24

Properties of Enantiomers and Optical Activity

It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
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A racemic mixture, or racemate, is an equimolar mixture of enantiomers of a molecule that can be separated using their unique interaction with chiral molecules or media. Racemic mixtures are denoted by the (±)- prefix. This ‘optical rotation descriptor’ applies to the whole solution of a racemic mixture rather than a specific stereoisomer. Enantiomers typically have the same physical and chemical properties. Hence, they are not easily separable. However, enantiomers can exhibit different...
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Tianeptine: enantiomeric separations, structural assignment, and biological interactions.

Saba Aslani1, Jordan Nafie2, M Farooq Wahab1

  • 1Department of Chemistry and Biochemistry, University of Texas at Arlington, 700 Planetarium Place, Arlington, TX, 76019, United States.

Talanta
|May 8, 2025
PubMed
Summary

Tianeptine, known as "gas station heroin," has dangerous opioid-like effects. This study developed chiral HPLC methods to separate tianeptine enantiomers, revealing S-tianeptine binds more strongly to human serum albumin.

Keywords:
Absolute configuration determinationFast chiral separationsPreparative chiral separationTianeptine enantiomersVibrational circular dichroism

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Area of Science:

  • Pharmacology
  • Analytical Chemistry
  • Forensic Science

Background:

  • Tianeptine, an atypical antidepressant, is misused recreationally for opioid-like effects.
  • Its unrestricted availability leads to severe adverse events and fatalities.
  • The therapeutic and toxic effects of tianeptine's single enantiomers remain understudied.

Purpose of the Study:

  • To develop enantioselective high-performance liquid chromatography (HPLC) methods for tianeptine separation.
  • To enable analytical and preparative purification of individual tianeptine enantiomers.
  • To investigate the enantiomeric ratio and protein binding of tianeptine.

Main Methods:

  • Development of normal phase and polar ionic mode enantioselective HPLC methods.
  • Utilization of two chiral stationary phases: WhelkoShell and NicoShell.
  • Analysis of absolute configurations using vibrational circular dichroism (VCD) spectroscopy.
  • Extraction of tianeptine from recreational products using ethanol.
  • Assessment of enantioselective protein binding using HPLC-UV.

Main Results:

  • Successful analytical and preparative separation of tianeptine enantiomers was achieved.
  • The elution order of enantiomers was consistent across both chiral stationary phases.
  • Absolute configurations were determined with 99% confidence using VCD.
  • Ethanol extraction provided a robust method for analyzing tianeptine in various products.
  • S-tianeptine exhibited a higher binding affinity to human serum albumin compared to its enantiomer.

Conclusions:

  • Enantioselective HPLC methods are crucial for studying tianeptine's distinct enantiomer effects.
  • The developed methods allow for reliable separation, purification, and quantitation of tianeptine enantiomers.
  • Understanding enantiomer-specific protein interactions, like with albumin, is vital for predicting tianeptine's pharmacological and toxicological profiles.