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. 2021 May 6;6(9):2100020. doi: 10.1002/admt.202100020

Figure 1.

Figure 1

A) Fabrication of colorimetric‐based glucose test‐strip by casting the indicated solutions on cellulose substrates. Adapted with permission.[ 15 ] Copyright 2020, Elsevier. B) The formation of a one‐step glucose sensor by integrating threonine−PEI dots with GOx as an enzyme‐fluorescent sensing probe. Adapted with permission.[ 18 ] Copyright 2020, American Chemical Society. C) The fundamental principle of the CDs/Fe3O4@APBA system for blood glucose determination. Adapted with permission.[ 24 ] Copyright 2020, Elsevier. D) The preparation of the Au‐ND/glucose/Ag NPs sandwich system based on the SERS principle. Adapted with permission.[ 25 ] Copyright 2021, RSC Pub.