Colloidal gold immune test paper strip for cubilose and preparation method for colloidal gold immune test paper strip
A technology of colloidal gold and test strips, which is applied in measurement devices, instruments, scientific instruments, etc., can solve the problems of low specificity of detection technology, cumbersome detection operation, and narrow application range, and achieves good anti-matrix interference effect and detection. Simple operation and wide range of effects
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Embodiment 1
[0033] Example 1 Separation and purification of target antigen.
[0034] The target antigen is bird's nest sialoglycoprotein, which consists of two proteins with the same antigenic determinant but different degrees of glycosylation modification, with molecular weights of 106 kDa and 128 kDa, respectively, and the isoelectric point ≤ 3.0.
[0035] The bird's nest was ultrasonically extracted with 7M urea for 10 minutes, centrifuged to take the supernatant, and separated and purified using a liquid phase focuser. The target protein was precipitated at the positive electrode and washed with deionized water to obtain the target protein. The target protein was verified by SDS-PAGE and 2-D PAGE, the results are as follows figure 1 As shown, no other foreign protein bands were seen, and the purity met the immune requirements.
Embodiment 2
[0036] Example 2 Preparation and purification of anti-sialoglycoprotein antibody.
[0037] Female balb / c mice were immunized with bird's nest sialoglycoprotein for 6 weeks, 3 in each group. For the first immunization injection, 100 μL of 100 μg / mL immune antigen was fully emulsified with the same amount of complete Freund’s adjuvant, and injected directly into the intraperitoneal cavity. After an interval of two weeks, take the sampled antigen, emulsify it with 100 μL of incomplete adjuvant, and inject it in the same way.
[0038] One day before cell fusion or on the same day, the Kunming rats were killed by pulling the neck, soaked in 70% alcohol, and disinfected the body surface; the Kunming rats were fixed on the wax board with pins, the abdomen was cut open on the ultra-clean workbench, and the peritoneum was picked up with small tweezers. Inject 5mL of RPMI-1640 complete culture solution (obtained by adding 15% volume percentage concentration of fetal bovine serum to G...
Embodiment 3
[0045] Example 3 Preparation of colloidal gold.
[0046] Take 1ml of 1% chloroauric acid solution, add 99ml of ultrapure water to form a final concentration of 0.01% chloroauric acid solution, after heating and boiling, take 1.6ml of 1% trisodium citrate and quickly add it to the boiling chloroauric acid solution at one time, Continue heating until the solution turns from light yellow to blue-black and finally bright red. After the color is stable, continue heating for 5 minutes, cool at room temperature, adjust pH to 5.9-6.2, and dilute to 100 mL with ultrapure water.
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