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Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
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Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
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The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
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New approaches in sensitive chiral CE.

Laura Sánchez-Hernández1, Miguel Guijarro-Diez, María Luisa Marina

  • 1Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, Faculty of Biology, Environmental Sciences and Chemistry, University of Alcalá, Alcalá de Henares, Madrid, Spain.

Electrophoresis
|October 18, 2013
PubMed
Summary

Capillary electrophoresis (CE) offers great chiral separation potential but suffers from low sensitivity with UV detection. Recent advances focus on sample treatment, preconcentration, and alternative detection methods to improve sensitivity for chiral analysis.

Keywords:
Chiral analysisIn-capillary sample preconcentrationOff-line/on-line sample treatmentOn-column/end-column detectionSensitivity improvement

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Area of Science:

  • Analytical Chemistry
  • Separation Science

Background:

  • Capillary electrophoresis (CE) is a powerful technique for chiral separations, offering high efficiency and resolution.
  • A major limitation of CE for chiral analysis is low sensitivity, particularly when using UV detection due to short optical path lengths.

Purpose of the Study:

  • To review recent methodological and instrumental advances (June 2011-May 2013) for enhancing sensitivity in chiral analysis by CE.
  • To summarize achieved sensitivity levels and applications of developed methods for enantioseparated analytes.

Main Methods:

  • Review of literature focusing on sample treatment strategies (on-line and off-line).
  • Investigation of in-capillary sample preconcentration techniques.
  • Exploration of alternative detection systems beyond UV-Vis, including fluorescence, conductimetry, electrochemiluminescence, and mass spectrometry (MS).

Main Results:

  • Various strategies significantly improve sensitivity in chiral CE.
  • Alternative detection methods and preconcentration techniques overcome UV detection limitations.
  • Developed methodologies enable sensitive enantioseparation and analysis.

Conclusions:

  • Significant progress has been made in enhancing sensitivity for chiral separations using CE.
  • The integration of advanced sample handling and detection technologies is key to overcoming CE's sensitivity challenges in chiral analysis.