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Introduction: The authors write that other methods are expensive, complex, tedious, time-consuming, and require complex sample pretreatment or need expensive equipment.  I do not agree.  The other methods (HPLC or chemiluminescence) are simple and inexpensive. These methods are not "sophisticated" but can be routinely performed by technicians.  Also, they do not require a complex nanomaterial to be prepared. Fluorometry is particularly expensive, in contrast.  Fluorometers do not come for less than 25,000 $ and require substantial operational skills.  The authors should discuss existing methods in a more balanced way.

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Many detection methods are sensitive and specific, like high performance liquid chromatography (HPLC)£¬ liquid chromatography-mass spectrometry (LC-MS)£¬ultra-fast liquid chromatography and photodiode array detection £¬and chemiluminescence (CL) . But they are expensive, time-consuming, and demand well-trained operators and complex pretreatment. All these negative characters limit their application. Therefore, a fast, low-cost and approachable method is vital for food quality and market surveillance.
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