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Chirality in Nature

Chirality in Nature

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.

Chirality

Chirality

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...

¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons

¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons

Replacing each alpha-hydrogen in chloroethane by bromine (or a different functional group) yields a pair of enantiomers. Such protons are called prochiral or enantiotopic and are related by a mirror plane. Enantiotopic protons are chemically equivalent in an achiral environment. Because most proton NMR spectra are recorded using achiral solvents, enantiotopic hydrogens yield a single signal.
In chiral compounds such as 2-butanol, replacing the methylene hydrogens at C3 produces a pair of...

Prochirality

Prochirality

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...

Properties of Enantiomers and Optical Activity

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,...

Chirality at Nitrogen, Phosphorus, and Sulfur

Chirality at Nitrogen, Phosphorus, and Sulfur

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.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...

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Related Experiment Video

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Engineering Molecular Recognition with Bio-mimetic Polymers on Single Walled Carbon Nanotubes

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Published on: January 10, 2017

Nanophotonic Approaches for Chirality Sensing.

Lauren A Warning, Ali Rafiei Miandashti, Lauren A McCarthy

¹College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China.

|October 5, 2021

Summary

Chiral nanophotonic materials offer ultrasensitive detection of biomolecules, reaching attomolar concentrations. These advancements in nanomaterial-enhanced chirality sensing have significant implications for medical diagnostics and drug testing.

Keywords:

biosensing chiral sensing circular dichroism metamaterial nanomaterials plasmonics self-assembly single-particle spectroscopy superchiral

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Last Updated: Oct 18, 2025

Engineering Molecular Recognition with Bio-mimetic Polymers on Single Walled Carbon Nanotubes

Engineering Molecular Recognition with Bio-mimetic Polymers on Single Walled Carbon Nanotubes

Published on: January 10, 2017

A Micropatterning Assay for Measuring Cell Chirality

A Micropatterning Assay for Measuring Cell Chirality

Published on: March 11, 2022

Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates

Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates

Published on: March 5, 2019

Area of Science:

Nanophotonics
Chirality Sensing
Biomolecule Detection

Background:

Chiral nanophotonic materials enhance light focusing at the nanoscale.
This nanoscale light manipulation increases sensitivity to molecular signatures.
Current nanomaterial-enhanced chirality sensing achieves attomolar detection limits.

Purpose of the Study:

To review the development of chiral nanomaterials for biosensing.
To discuss their application in detecting biomolecules and environmental stimuli.
To explore advancements in achieving single-molecule chirality sensing.

Main Methods:

Discussion of superchiral near-field generation in dielectric and plasmonic metamaterials.
Review of plasmon-coupled circular dichroism mechanisms in plasmonic nanoparticles.
Exploration of hotspot-enhanced plasmon-coupled circular dichroism for biosensing.
Analysis of single-particle spectroscopic methods.

Main Results:

Chiral nanostructures, both dielectric and plasmonic, enable superchiral near-field generation.
Plasmonic nanoparticles exhibit plasmon-coupled circular dichroism, enhancing chiroptical signals.
Hotspot-enhanced plasmon-coupled circular dichroism significantly improves biosensing sensitivity.
Single-particle spectroscopy approaches the goal of single-molecule chirality sensing.

Conclusions:

Chiral nanophotonic materials are highly effective for sensitive biomolecule detection.
These materials are crucial for applications in pharmaceuticals, forensics, and medicine.
Future outlooks focus on advancing nanophotonic chiral systems for enhanced sensing capabilities.