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oe1(光电查) - 科学论文

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?? 中文（中国） ▾

  • Selective detection of folic acid in the midst of other biomolecules using water-soluble AgInS2 quantum dots

    摘要： We herein report the detection of folic acid (FA) via the fluorometric method using water-soluble AgInS2 quantum dots (QDs). The optical analysis showed that the addition of FA to AgInS2 QDs results in significant, blue-shifted photoluminescence emission. A linear plot of the blueshift in the photoluminescence wavelength position against FA concentration was obtained in the range of 0.03–33 μM with the detection limit of 52 nM. Interference study showed the selective detection of FA in the presence of other biomolecules. The as-synthesized AgInS2 QDs can be employed as an optical sensor for the rapid detection of FA in aqueous solutions.

    关键词： photoluminescence,fluorometric method,optical sensor,AgInS2 quantum dots,folic acid

    更新于2025-09-12 10:27:22

  • Study on the preparation of water-soluble AgInS2 quantum dots and their application in the detection of ciprofloxacin

    摘要： Water-soluble AgInS2 quantum dots (AIS QDs) were prepared by hot-injection method with thioglycolic acid (TGA) as the stabilizer. The fluorescence of as-prepared AIS QDs could be quenched effectively by ciprofloxacin. Herein, a method for the content determination of ciprofloxacin based on the fluorescence quenching effect was explored. The experimental results showed that the particle size of AIS QDs prepared at pH = 4 was about 3–8 nm, and the maximum fluorescence emission wavelength was centered at 626 nm at λex = 500 nm. The measured concentration range of ciprofloxacin could be adjusted by varying the amount of AIS QDs solution. When 0.40 mL AIS QDs solution was used for the content determination of ciprofloxacin, a good linearity relationship was achieved between the quenched efficiency of AIS QDs fluorescence and the concentration of ciprofloxacin in the range of 1.0–19.5 μg/mL, the correlation coefficient was 0.996, the detection limit of ciprofloxacin was 0.12 μg/mL, and the blank spike recoveries were in the range of 96.7–103.3%. The method is of wide detection range, excellent selectivity, high sensitivity and easy operability, could be applied for the content determination of ciprofloxacin in drugs.

    关键词： AgInS2 quantum dots,Ciprofloxacin,Fluorescence quenching,Content determination

    更新于2025-09-12 10:27:22