Journal
CHINESE CHEMICAL LETTERS
Volume 34, Issue 6, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cclet.2022.107998
Keywords
Carbon quantum dots; Biomass waste; Biological imaging; Bioresource conversion; Green extraction
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In the context of the circular economy, biomass waste can be converted into value-added materials and energy to reduce pollution and waste disposal costs. This study developed low-cost and environmentally friendly carbon quantum dots (CQDs) from peach leaf waste, which showed excellent fluorescence properties and stability, making them a potential candidate for biological imaging.
In the context of the circular economy, the huge amounts of biomass waste should be converted into value-added materials and energy to diminish pollution, atmospheric CO2 levels and costly waste dis-posal. Biological imaging usually uses expensive and toxic chemicals e.g., organic dyes, semiconductor quantum dots, calling for safer, greener, cheaper fluorescent probes for biological imaging in vitro and in vivo . In these regards, carbon quantum dots (CQDs)-based fluorescent probes using biomass waste as a precursor may have much higher potential. Here we transformed the biomass waste of peach leaves into value-added fluorescent CQDs through a low-cost and green one-step hydrothermal process. The obtained CQDs show excitation-dependent photoluminescence properties with a fluorescence lifetime of 5.96 ns and a quantum yield of 7.71% without any passivation. In addition, the CQDs have a fine size of 1.9 nm with good hydrophilicity and high fluorescent stability over pH 4.0-11.0 range. Fluorescence imaging of in vitro cell cultures and in vivo with zebrafish show that CQDs possess ultra-low toxicity and remarkable performance for biological imaging. Even when CQDs present at a concentration as high as 500 mu g/mL, the organism can still maintain more than 90% activity both in vitro and in vivo , and present bright fluorescence. The cheaper, greener, ultra-low toxicity CQDs developed in this work is a potential candidate for biological imaging in vitro and in vivo . (c) 2023 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.
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