Preparation method of alpha-oxoglutarate fluorescent/ultraviolet molecular probe and application of alpha-oxoglutarate fluorescent/ultraviolet molecular probe to biological samples
A ketoglutaric acid and molecular probe technology, applied in the field of analytical chemistry, to achieve the effect of reducing error sources, sensitive detection, and reducing background interference
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Embodiment 1
[0077] Example 1: Preparation of fluorescent / ultraviolet molecular probes for alpha-ketoglutarate
[0078] Dissolve 0.3g of NBD-Cl into 50mL of chloroform, then add 50mL of hydrazine hydrate-methanol solution with a volume concentration of 0.6%, mix well, and stir at room temperature for 30min to obtain a brown precipitate, which is filtered, and the filter cake is washed with ethyl acetate and dried. 0.29 g of a brown product was obtained, which was a fluorescent / ultraviolet molecular probe for alpha-ketoglutarate (probe HNBD), and the yield was 97%.
[0079] The fluorescent / ultraviolet molecular probe effect judgment index of the prepared alpha-ketoglutarate is as follows:
[0080] Detection sensitivity: the detection limit is 0.9 μmol / L; the fluorescence enhancement factor is 20-60 times;
[0081] Absorption wavelength changes: Absorption moves 100nm to red light during detection;
[0082] Dual-channel color change: the color changes from light green to red under fluoresc...
Embodiment 2
[0087] Example 2: Detection of alpha-ketoglutarate content in serum (using the fluorescent / ultraviolet molecular probe for alpha-ketoglutarate prepared in Example 1)
[0088] Serum samples from cancer patients (esophageal cancer, right breast cancer, right colon cancer, and rectal cancer) were added to alpha-ketoglutarate standard products to make alpha-ketoglutarate serum models (100 μM) as test objects:
[0089] Prepare the solution
[0090] Preparation of probe HNBD stock solution: Accurately weigh the fluorescent / ultraviolet molecular probe of alpha-ketoglutaric acid and dissolve it in anhydrous acetonitrile to prepare a concentration of 2×10 -4 Probe HNBD stock solution of M;
[0091] Preparation of alpha-ketoglutaric acid (α-KA) stock solution: accurately weigh alpha-ketoglutaric acid and dissolve it in anhydrous acetonitrile to prepare a concentration of 1×10 -3 alpha-ketoglutarate stock solution of M;
[0092] Preparation of serum stock solution: mix serum and anhyd...
Embodiment 3
[0102] Example 3: Visual monitoring of alpha-ketoglutarate in serum samples (samples are the same as in Example 2)
[0103] The method is: mix the serum sample to be tested with anhydrous acetonitrile at a volume ratio of 5:1, centrifuge at 5000rpm for 20min, take the supernatant and pass it through a 0.2μm membrane, take 200μL of the obtained supernatant and add 100μL of the probe HNBD stock solution in turn and 200 μLalpha-ketoglutaric acid stock solution, then dilute to 1000 μL with PBS buffer solution of pH 7.4, store the resulting solution at 37°C for 60 min, and observe and image under a fluorescent microscope. The colors are: green under ultraviolet light, fluorescent light The bottom is light red, which proves that it contains alpha-ketoglutarate.
[0104] The preparation method of the probe HNBD stock solution and the alpha-ketoglutarate stock solution is the same as in Example 2.
[0105] Depend on Figure 7 For blank + HNBD samples, it can be seen that there is no...
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