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Chiral Plasmonic Nanoparticle Assisted Raman Enantioselective Recognition
Xueping Sun1, Huanjun Kong1, Qinghai Zhou1
1The Education Ministry Key Lab of Resource Chemistry, College of Chemistry and Materials Science, Shanghai Normal University, Shanghai 200234, China.
Analytical Chemistry
|May 26, 2020
Summary
Chiral gold nanoparticles with surface enhanced Raman scattering (SERS) activity enable enantioselective recognition. These nanomaterials selectively detect cystine enantiomers, offering a novel method for chiral analysis.
Area of Science:
- Plasmonic Nanomaterials
- Chiral Chemistry
- Spectroscopy
Background:
- Chirality is crucial in biological and chemical systems.
- Developing selective methods for enantiomer recognition is essential.
- Surface-enhanced Raman scattering (SERS) offers high sensitivity for molecular detection.
Purpose of the Study:
- To develop a novel enantioselective recognition method using chiral plasmonic nanomaterials.
- To investigate the surface enhanced Raman scattering (SERS) activity of chiral gold nanoparticles (Au NPs).
- To demonstrate the selective detection of cystine enantiomers.
Main Methods:
- Synthesized chiral gold nanoparticles (Au NPs) with defined handedness (d- or l-) detached from inorganic chiral silica.
- Utilized these chiral Au NPs as substrates for surface enhanced Raman scattering (SERS) analysis.
- Measured and compared Raman scattering signal intensities of d- and l-cystine in the presence of chiral Au substrates.
Main Results:
- Chiral Au NPs exhibited intrinsic chirality and significant SERS activity.
- A notable difference in SERS signal intensity was observed for cystine enantiomers based on their handedness matching the Au NPs.
- Signal intensities for same-handed enantiomers were over three times higher than for opposite-handed enantiomers.
Conclusions:
- Chiral plasmonic metallic nanomaterials provide a powerful platform for enantioselective recognition.
- This study presents a novel method for enantioselective recognition using ordinary Raman spectroscopy.
- The developed technique offers enhanced selectivity and sensitivity for chiral analysis.
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