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. 2021 Sep 18;22(18):10116. doi: 10.3390/ijms221810116

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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(a) Ratiometric fluorescence detection of ascorbic acid (AA) based on the “OFF” and “ON” step of a nanoprobe that contains a blue-emitting carbon dot (CD) and red-emitting, silica-coated QDs (QDs@SiO₂) [62]. (b) Fluorescence detection of serotonin (5-HT) using hybrid QDs, silica, and molecularly imprinted polymers (QDs@SiO₂@MIPs) [63]. (c) Selective recognition of malachite green (MG) using MIP-coated QDs [64]. (d) Specific recognition and fluorescence quantification of bovine serum albumin (BSA) using epitope MIP (EMIP) coated QDs [65].