Journal
ANALYTICAL CHEMISTRY
Volume 94, Issue 14, Pages 5667-5673Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.2c00315
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Funding
- National Natural Science Foundation of China [22104059]
- Natural Science Foundation of Jiangsu Province [BK20190507]
- College Students' Innovative Entrepreneurial Training Plan Program [202123XX05]
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An aptamer-based nonenzymatic autonomous DNA walking machine has been developed for monitoring trace malathion contamination. The machine shows high stability, sensitivity, and biocompatibility, and can be applied to actual samples.
Intensive applications of toxic malathion pesticides bring a vital threat to the environment and health. Hence, a credible and sensitive strategy is urgently needed for the respective detection of malathion. In this work, an aptamer-based nonenzymatic autonomous DNA walking machine was fabricated for monitoring trace malathion contamination in cells and foods. Along with the machine walking driven by malathion-triggered reaction entropy, multiple fluorescent signal outputs were thermodynamically generated for signal amplification. The proposed stable DNA nanomachine achieved satisfactory results with a detection limit of 81.9 pg L-1 for testing malathion, which could be applied to actual samples including apple juice, paddy water, and paddy soil. Furthermore, the high stability, sensitivity, and biocompatibility of the nanomachine enabled monitoring of the malathion contamination in living cells and bioaccumulation in lettuce without additional purification. Consequently, with these excellent performances, it is strongly anticipated that the DNA walking machine has tremendous potential to be extended to general platforms against pesticides to avoid malathion-contaminated agricultural production for environmental safety and human health.
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