4.8 Article

Construction and Research of Multiple Stimuli-Responsive 2D Photonic Crystal DNA Hydrogel Sensing Platform with Double-Network Structure and Signal Self-Expression

期刊

ANALYTICAL CHEMISTRY
卷 94, 期 14, 页码 5530-5537

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.1c04390

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资金

  1. National Natural Science Foundation of China [21874037, 21906077]
  2. China Postdoctoral Science Foundation [2021M690053]

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A stimuli-responsive 2D PhC DN-DNA hydrogel sensing platform was developed by combining the signal self-expression of 2D PhC array with the selective recognition of PAM/DNA DN hydrogel. The hydrogel showed good detection performance for pH and Ag+/Cys, with the Debye diffraction ring diameter correlated with the concentration of Ag+/Cys.
The stimuli-responsive DNA hydrogel has attracted wide attention in the fields of chemical and biological sensing. However, it is still a challenge to integrate characteristics with low-cost, high mechanical strength, and signal self-expression into a DNA hydrogel simultaneously. Herein, a stimuli-responsive 2D photonic crystal double network DNA hydrogel (2D PhC DN-DNA hydrogel) sensing platform is developed via combining the signal self-expression of 2D PhC array with the selective recognition of polyacrylamide (PAM)/DNA DN hydrogel. The change of DNA configuration induced by specific target triggers the change of 2D PhC DN-DNA hydrogel volume, leading to a shift of the Debye diffraction ring diameter. In order to verify the feasibility of this strategy, the 2D PhC DN-DNA hydrogel with C- rich sequences is chosen as a proof-of-concept. The results indicate that the hydrogel has good detection performance for pH and Ag+/Cys. And the Debye diffraction ring diameter of the hydrogel is correlated with the concentration of the Ag+/Cys in the range of 0.5-20 mu M. Compared with previously pure DNA hydrogel sensing platform, the 2D PhC DN-DNA hydrogel features low-cost preparation process and label-free determination. Meanwhile, only a laser pointer and a ruler are needed for the determination of targets, which shows that the hydrogel has application prospect in the development of portable response equipment.

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