Chiral molecular imprinting-based SERS detection strategy for absolute enantiomeric discrimination

Maryam Arabi, Abbas Ostovan, Yunqing Wang (), Rongchao Mei, Longwen Fu, Jinhua Li, Xiaoyan Wang and Lingxin Chen ()
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Maryam Arabi: Chinese Academy of Sciences
Abbas Ostovan: Chinese Academy of Sciences
Yunqing Wang: Chinese Academy of Sciences
Rongchao Mei: Chinese Academy of Sciences
Longwen Fu: Chinese Academy of Sciences
Jinhua Li: Chinese Academy of Sciences
Xiaoyan Wang: Chinese Academy of Sciences
Lingxin Chen: Chinese Academy of Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-14

Abstract: Abstract Chiral discrimination is critical in environmental and life sciences. However, an ideal chiral discrimination strategy has not yet been developed because of the inevitable nonspecific binding entity of wrong enantiomers or insufficient intrinsic optical activities of chiral molecules. Here, we propose an “inspector” recognition mechanism (IRM), which is implemented on a chiral imprinted polydopamine (PDA) layer coated on surface-enhanced Raman scattering (SERS) tag layer. The IRM works based on the permeability change of the imprinted PDA after the chiral recognition and scrutiny of the permeability by an inspector molecule. Good enantiomer can specifically recognize and fully fill the chiral imprinted cavities, whereas the wrong cannot. Then a linear shape aminothiol molecule, as an inspector of the recognition status is introduced, which can only percolate through the vacant and nonspecifically occupied cavities, inducing the SERS signal to decrease. Accordingly, chirality information exclusively stems from good enantiomer specific binding, while nonspecific recognition of wrong enantiomer is curbed. The IRM benefits from sensitivity and versatility, enabling absolute discrimination of a wide variety of chiral molecules regardless of size, functional groups, polarities, optical activities, Raman scattering, and the number of chiral centers.

Date: 2022
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DOI: 10.1038/s41467-022-33448-w

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