Method for highly sensitive quantitative detection of quantum dot fluorescence immunochromatographic assay
A fluorescence immunochromatography, quantitative detection technology, applied in the direction of measurement devices, analytical materials, instruments, etc., can solve the problems of low sensitivity, difficult to distinguish background and signal, unclear fluorescence quantitative method, etc., to improve sensitivity and improve detection sensitivity. Effect
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Embodiment 1
[0071] Example 1: Double-antibody sandwich determination of human chorionic gonadotropin (hCG)
[0072] (1) Synthesis and modification of quantum dots
[0073] Take 0.2375g of selenium powder, 2.60mL of octadecene and 1.57mL of tri-n-octylphosphine, add them in turn to a 25ml small reagent bottle, heat the mixed liquid in the bottle and shake repeatedly until the selenium powder is completely dissolved, and then the selenium precursor is obtained. Another 0.0368g of cadmium oxide, 0.342g of stearic acid and 3.8ml of octadecene were added to the three-necked flask in sequence, and heated under the protection of nitrogen until the cadmium oxide was completely dissolved. Lower the temperature to cool the solution to solidify. Take 2.25g of octadecylamine and 0.95g of trioctylphosphine oxide, put them into a three-necked flask, and heat to melt the solid, continue to heat to 280°C, inject 4.2mL of selenium precursor, and raise the temperature to 240°C to make the CdSe quantum dot...
Embodiment 2
[0086] Embodiment 2: Competitive method is measured organophosphorus
[0087] (1) Quantum dot synthesis and modification
[0088] For the synthesis of CdTe quantum dots, add absolute ethanol and primary water to the reactor containing appropriate amount of Te powder and sodium borohydride in the ratio of 2:1 by volume, and react in a water bath at 60°C under nitrogen gas until black Te The powder is completely gone. Add a slight excess of 0.5mol / L H 2 SO 4 , yielding H 2 Te is absorbed by NaOH solution to obtain NaHTe aqueous solution.
[0089] CdCl under nitrogen 2 2.5 H 2 O was dissolved in 100mL ultrapure water, then added mercaptopropionic acid, and 0.5mol / L NaOH solution was added dropwise under stirring to adjust the pH of the solution to 11.2, and finally 0.1mmol NaHTe solution was injected, wherein Cd: Te: mercaptopropionic acid The ratio is 1.0:0.5:2.4. The resulting mixed solution was heated to reflux at 100° C. under nitrogen to obtain CdTe quantum dots, whi...
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