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Related Concept Videos

Chirality02:25

Chirality

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Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
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Chirality at Nitrogen, Phosphorus, and Sulfur02:30

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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 with Multiple Chiral Centers02:25

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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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Supercritical Fluid Chromatography01:18

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Supercritical fluid chromatography (SFC) provides a beneficial substitute for gas chromatography (GC) and liquid chromatography (LC) for certain samples because it merges the top attributes of both techniques. SFC allows the separation and analysis of compounds that GC or LC does not easily manage. These compounds are traditionally nonvolatile or thermally unstable, making GC unsuitable and lacking functional groups required for HPLC analysis.
SFC utilizes a supercritical fluid mobile phase,...
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Fischer Projections02:18

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Learning to draw Fischer projections of molecules and understanding their relevance plays a crucial role in the visual depiction of organic molecules. A Fischer projection is a two-dimensional projection on a planar surface to simplify the three-dimensional wedge–dash representation of molecules. This is especially helpful in the case of molecules with multiple chiral centers that can be difficult to draw. Here, all the bonds of interest are represented as horizontal or vertical lines.
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Prochirality02:05

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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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Label-Free SERS Fingerprinting for Chiral Discrimination Using Chiral Two-Dimensional Superlattice.

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Summary

This study introduces a direct, label-free surface-enhanced Raman scattering (SERS) method for chiral discrimination using a tantalum disulfide (TaS2) superlattice. This technique achieves highly sensitive detection of enantiomers in biological samples like saliva.

Keywords:
TaS2 chiral superlatticesl- and d-glucose detectionlabel-free SERStwo-dimensional superlattices

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Area of Science:

  • Chirality and enantiomer analysis
  • Advanced materials science
  • Spectroscopic techniques

Background:

  • Chiral discrimination is vital in pharmaceuticals and biology.
  • Current surface-enhanced Raman scattering (SERS) methods require indirect detection, limiting versatility.
  • Developing direct, label-free chiral sensing is a significant challenge.

Purpose of the Study:

  • To develop a direct, label-free SERS method for sensing biologically relevant enantiomers.
  • To utilize a two-dimensional transition metal dichalcogenide (TaS2) based chiral superlattice for enantiospecific molecular fingerprinting.
  • To achieve sensitive and accurate chiral discrimination without supplementary selectors.

Main Methods:

  • Fabrication of a chiral superlattice using tantalum disulfide (TaS2).
  • Direct label-free SERS measurements of enantiomers.
  • Application of the method to detect l- and d-glucose in saliva samples.

Main Results:

  • Achieved clear enantiodiscrimination of l- and d-glucose with a detection limit of 8 × 10^-10 M.
  • Demonstrated noninvasive identification of enantiomers in actual saliva samples.
  • Enabled multiplex quantification of enantiomeric ratios with high predictive accuracy.

Conclusions:

  • The TaS2-based chiral superlattice enables direct, label-free SERS sensing for versatile chiral discrimination.
  • This method offers high sensitivity and accuracy for analyzing biologically important enantiomers.
  • The approach has potential applications in pharmaceutical analysis, diagnostics, and fundamental biological studies.