Sulfur-doped carbon quantum dot fluorescence sensitization method for testing norfloxacin
A technology of carbon quantum dots and norfloxacin, which is applied in the field of sulfur-doped carbon quantum dots for fluorescence-enhanced detection of norfloxacin, achieving high sensitivity, specificity, high sensitivity, and high fluorescence quantum yield
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Embodiment 1
[0023] Embodiment 1: the content determination operation steps of norfloxacin in the blood are as follows:
[0024] (1) Preparation of water-soluble sulfur-doped fluorescent carbon quantum dots (S-CQDs): Weigh 2.0g sodium poly(4-styrenesulfonic acid-copolymerization-maleic acid) into 100mL ultrapure water, and ultrasonicate for 5min Form a colorless and transparent solution, transfer it to a polytetrafluoroethylene reactor, heat at 220°C for 5 h, and after natural cooling, first filter it with a filter membrane with a pore size of 0.22 μm, and then perform dialysis treatment with a dialysis bag with a molecular weight cut-off of 3000 Da for 24 h , to obtain water-soluble sulfur-doped fluorescent carbon quantum dots;
[0025] (2) Drawing of the standard working curve: 8 norfloxacin with concentrations of 0.01, 0.05, 0.1, 0.2, 0.5, 1, 5, 10 μmol / L were prepared using pH5.0 citric acid-disodium hydrogen phosphate buffer solution Standard solution, and set the volume at 5 mL; add...
Embodiment 2
[0028] Embodiment 2: the content determination steps of norfloxacin in the urine sample are:
[0029] (1) Preparation of water-soluble sulfur-doped fluorescent carbon quantum dots: The preparation method of water-soluble sulfur-doped fluorescent carbon quantum dots is to weigh 3.0 g poly(4-styrenesulfonic acid-copolymerization-maleic acid) sodium and add 100mL of ultrapure water, ultrasonic 8min to form a colorless transparent solution, and transferred to a polytetrafluoroethylene reactor, heated at 200 ℃ for 8h, after natural cooling, first filter with a filter membrane with a pore size of 0.22μm, and then filter with a molecular weight cut-off of 3500Da The dialysis bag was dialyzed for 24 hours to obtain water-soluble sulfur-doped fluorescent carbon quantum dots;
[0030] (2) drawing of standard working curve: with embodiment 1 step (2);
[0031] (3) Urine sample preparation: Take 5 mL of urine, add 1 g of activated carbon, vortex and mix for 1 min, let it stand and filter...
Embodiment 3
[0033] Embodiment 3: the content determination steps of norfloxacin in the milk sample are:
[0034] (1) Preparation of water-soluble sulfur-doped fluorescent carbon quantum dots: The preparation method of water-soluble sulfur-doped fluorescent carbon quantum dots is to weigh 5.0 g poly(4-styrenesulfonic acid-copolymerization-maleic acid) sodium and add 100mL of ultrapure water, ultrasonic 10min to form a colorless transparent solution, and transferred to a polytetrafluoroethylene reactor, heated at 240 ℃ for 6h, after natural cooling, first filter with a filter membrane with a pore size of 0.22μm, and then filter with a molecular weight cut-off of 3200Da The dialysis bag was dialyzed for 24 hours to obtain water-soluble sulfur-doped fluorescent carbon quantum dots.
[0035] (2) drawing of standard working curve: with embodiment 1 step (2);
[0036] (3) Milk sample preparation: Take 5 mL of milk, add 10 mL of methanol-water-formic acid (28:72:0.1, v / v) extract and 1 mL of 4% tr...
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