Dihydrocapsaicin artificial hapten and artificial antigen as well as preparation methods thereof
A technology of dihydrocapsaicin and artificial hapten, applied in the field of immunochemistry, can solve the problems of high detection cost, complicated operation, long cycle and the like, and achieve the effects of high sensitivity, strong specificity and high affinity
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[0034] Example 1
[0035] Preparation of dihydrocapsaicin artificial hapten
[0036] Weigh 5.86g of N-(4-hydroxy-3-methoxybenzyl)nonanamide, 2.36g of maleic anhydride and 0.49g of N,N'-dicyclohexylcarbodiimide, 25mL of dichloromethane in React for 0.5h at room temperature in the reaction flask, then place the above reaction solution in an ice bath to control the temperature within the range of 0~5℃, take 0.30g of 4-dimethylaminopyridine and 4mL of dichloromethane and place it in a constant pressure drop Mix thoroughly in the funnel, slowly add dropwise to the reaction flask, 0.5h dripping is completed, after the dripping is completed, keep the room temperature and 25℃ and continue to stir for 6 hours, filter the reaction solution, and distill under reduced pressure to remove the solvent to obtain a pale yellow oil Then, the crude product was passed through silica gel column chromatography, column chromatography reagent: a mixed solution of petroleum ether and ethyl acetate with a ...
Example Embodiment
[0039] Example 2
[0040] Preparation of dihydrocapsaicin artificial antigen
[0041] Weigh 6 mg of dihydrocapsaicin hapten (E)-4-[2-methoxy-4-(nonamidomethyl)phenoxy]-4-oxo-2-butenoic acid, and then weigh 10mg NHS, Dissolve 0.2mL DMF in the reaction device, and carry out the reaction at room temperature (25-27°C) under magnetic stirring for 1 hour; weigh 20 mg of DCC and dissolve it in 200uL DMF, add dropwise to the above reaction device, react at room temperature for 4 hours, and a white precipitate is formed , Let stand overnight, centrifuge at 8000r / min, 5min, and take the supernatant;
[0042] The supernatant was slowly added dropwise to 10ml of 2mg / mL bovine serum albumin phosphate buffer solution and stirred at room temperature for 12h; the bovine serum albumin phosphate buffer solution was bovine serum albumin with 0.2M pH 8 is obtained by dissolving in phosphate buffer. Then it was dialyzed with 0.01M PBS buffer for 72 hours, and the dialysate was replaced once in 4-8 hou...
Example Embodiment
[0043] Example 3
[0044] Preparation of Dihydrocapsaicin Antiserum
[0045] Using 400 uL of the dihydrocapsaicin artificial antigen prepared in Example 2 as the immunogen, it was mixed with an equal volume of Freund's complete adjuvant to emulsify completely, and 4 Balb / c mice were immunized and injected subcutaneously on the back. The first immunization was emulsified with Freund's complete adjuvant, and the subsequent emulsification with incomplete adjuvant, each 100ug / time, the interval between the first immunization and the second immunization was 4 weeks, and the interval between each immunization was 3 weeks, and a total of 4 immunizations. Starting from the second immunization, collect blood from the tail of the mice 7-10 days after each immunization, about 25μL per mouse, place the blood sample at 37°C for half an hour, centrifuge at 5,000r / min for 1min, take the supernatant and mix with equal volume of glycerol ,Store at -20℃ for later use for potency testing.
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