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. 2019 Jun 11;9:8497. doi: 10.1038/s41598-019-43288-2

Figure 1.

Figure 1

Scheme for the EDC/NHS facilitated conjugation for RB-AuNPs. The Carboxylic groups in the RB molecules are first activated by EDC and then conjugated with the amine groups on the surface of the AuNPs, in the presence of NHS as the catalyst.