Colloidal gold kit for detecting beta-stimulant drug and preparation method thereof
A stimulant and colloidal gold technology, which is applied in the colloidal gold kit for detecting β-stimulant drugs and its preparation field, can solve the problem of low sensitivity of capillary electrophoresis, low stability of enzyme-linked immunosorbent method, and chromatographic operation process. cumbersome and other problems, to achieve the effect of improved sensitivity, low cost, and fast chromatography
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Embodiment 1
[0032] Example 1 A colloidal gold kit for detecting β-agonist drugs
[0033] 1) Preparation of colloidal gold solution: take 1% chloroauric acid solution and dilute it 100 times with double distilled water, heat, stir and boil, add 1% trisodium citrate, continue heating and stirring until the color of the solution turns red, stop heating, and cool to room temperature to obtain a colloidal gold solution.
[0034] 2) Preparation of colloidal gold markers: Add β-agonist polyclonal antibody and ractopamine monoclonal antibody to the colloidal gold solution while stirring, then add 5% bovine serum albumin, centrifuge for 15min, take the precipitate and add PBS buffer solution with pH 7.4, centrifuged for 15min to obtain the precipitate, continue the above operation 2-4 times, dissolve the precipitate with PBS buffer solution containing 2% BSA, filter to obtain the colloidal gold marker, add the colloidal gold marker to the micro Wells, freeze-dried to obtain gold-labeled microwell...
Embodiment 2
[0037] Example 2 The method of detecting ractopamine residues in raw milk and fresh milk with the colloidal gold kit of the above-mentioned β-stimulant drugs:
[0038] 1) Take 100 μL of milk sample and add it to the gold standard microwell, place it on a 50°C incubator and incubate for 5 minutes, and blow it with a small dropper to completely dissolve the red substance in the well;
[0039] 2) Insert the reagent strip into the gold-labeled microwell and incubate for 5 minutes;
[0040] 3) Take out the reagent strip from the microwell of the gold standard, and directly visually test the color intensity of the reagent strip, or interpret it with a matching colloidal gold reader;
[0041] 4) Interpretation of results
[0042] Such as image 3 Shown in a: Negative (-): The color of the T1 line is darker or the same as that of the C line, which is negative, indicating that the residual concentration of ractopamine in the sample is lower than the detection limit or there is no rac...
Embodiment 3
[0044] Example 3 Operation method for detecting salbutamol residues in raw milk and fresh milk with the colloidal gold kit of the above-mentioned β-agonist drugs
[0045] 1) Take 100 μL of milk sample and add it to the gold standard microwell, place it on a 50°C incubator and incubate for 5 minutes, and blow it with a small dropper to completely dissolve the red substance in the well;
[0046] 2) Insert the reagent strip into the gold-labeled microwell and incubate for 5 minutes;
[0047] 3) Take out the reagent strip from the microwell of the gold standard, and directly visually test the color intensity of the reagent strip, or interpret it with a matching colloidal gold reader;
[0048] 4) Interpretation of results
[0049] Such as image 3 Shown in middle b: Negative (-): The color of the T2 line is darker or as dark as that of the C line, indicating that the salbutamol drug residue concentration in the sample is lower than the detection limit or there is no salbutamol dr...
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