Application of benzothiazole derivatives in anti-counterfeiting and food detection
A technology of benzothiazole and derivatives, which is applied in the application field of benzothiazole derivatives, can solve the problems of limiting the practical application of sensing materials and the limited sensing ability, and achieves the effect of realizing multiple anti-counterfeiting and accurate multiple anti-counterfeiting.
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Embodiment 1
[0052] Example 1: Aggregation-induced fluorescence enhancement of benzothiazole derivatives (1).
[0053] Take 3 μL of the benzothiazole derivative (1) mother liquor and add it to 3 mL of acetonitrile and deionized water mixed solvent (the volume ratio of acetonitrile and water is: 10:1, 8:2, 6:4, 4:6, 2: 8, 0:10), to detect changes in fluorescence intensity, see figure 1 . Detect the fluorescence emission intensity at 513nm at different water contents in the mixed solvent of acetonitrile and deionized water. Take the content of deionized water as the horizontal axis and the fluorescence intensity at 513nm as the vertical axis to draw a graph. When the content of deionized water is greater than 90%, the Sudden increase in fluorescence, see figure 2 . The aggregation-induced fluorescence enhancement effect of benzothiazole derivatives (1) can be used for solid-state fluorescence applications.
Embodiment 2
[0054] Example 2: Fluorescence analysis of the benzothiazole derivative (1) in deionized water with the pH value first increasing and then decreasing.
[0055] Take 100 μL of the benzothiazole derivative (1) mother liquor and add it to 100 mL of deionized water. The pH meter measures its pH value as 5.52, and adjusts the pH value to 7.62, 9.10, 10.01, 11.60, and 13.03 with 1M and 0.1M sodium hydroxide solutions, respectively. , to detect fluorescence emission peaks and intensity changes. As the pH value gradually increased to 10.01, the fluorescence emission peak gradually blue-shifted from 513nm to 458nm, accompanied by fluorescence enhancement; as the pH value continued to increase to 13.03, the fluorescence emission peak gradually red-shifted from 458nm to 497nm. Accompanied by a decrease in fluorescence intensity, see image 3 . Thereafter, the pH values were adjusted to 12.41, 10.42, 9.38, 7.90, 5.61, and 2.95 with 1M and 0.1M hydrochloric acid solutions, respectively...
Embodiment 3
[0056] Example 3: Fluorescence analysis of the benzothiazole derivative (1) in deionized water with the pH value first decreasing and then increasing.
[0057] Take 100 μL of the benzothiazole derivative (1) mother liquor and add it to 100 mL of deionized water. The pH meter measures its pH value as 5.53, and adjusts the pH value to 3.61 and 1.97 with 1 M and 0.1 M hydrochloric acid solutions, respectively, and detects the fluorescence emission peak and intensity change . As the pH value gradually decreases to 1.97, the fluorescence emission peak at 513nm shows an overall downward trend; see Figure 5 . Thereafter, the pH values of the solutions were gradually increased to 2.59, 7.25, 9.97, 11.00, and 12.81, respectively. When the pH value increased to 9.97, the fluorescence emission peak gradually blue-shifted from 513nm to 458nm, accompanied by fluorescence enhancement; as the pH continued to increase to 12.81, the fluorescence emission peak gradually red-shifted from 45...
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