Fluorescent immunochromatographic test paper for detecting human apoe-ε4 protein and preparation method thereof
A technology of fluorescent immunochromatography and test strips, which is applied in the direction of biological testing, material inspection products, etc., can solve the problem of no human ApoE protein, etc., and achieve improved detection sensitivity and result reliability, good sensitivity, and increased fluorescence signal-to-background ratio Effect
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Embodiment 1
[0106] Example 1: Preparation of ApoE-ε4 epitope peptides (1) and (2).
[0107] The preparation method uses chemical synthesis method: ApoE-ε4 epitope peptides (1) and (2) are respectively synthesized by solid-phase method using the American ABI431A automatic peptide synthesizer. The purity of the epitope peptide was assessed by high performance liquid chromatography, and the concentration of the peptide was determined. The molecular weights of the antigenic epitope peptides (1) and (2) of the present invention are 2187.32 and 2909.12 respectively, which are determined by mass spectrometry, and the synthesized polypeptide sequences are identified by polypeptide sequence determination.
[0108] 1. Synthesis of ApoE-ε4 epitope peptides (1) and (2)
[0109] The above peptides were synthesized by solid-phase method. The main idea of solid-phase peptide synthesis is: first connect the carboxyl group of the carboxyl-terminal amino acid of the peptide chain to be synthesized with...
Embodiment 2
[0197] Embodiment 2: the ApoE-ε4 antigen epitope peptide (1) and (2) obtained in Example 1 are connected with carrier protein to prepare ApoE-ε4 antigen (1) and (2), utilize gained antigen (1) and (2) Animals are immunized separately to prepare specific monoclonal antibodies and polyclonal antibodies using the antigen (1), and specific monoclonal antibodies and polyclonal antibodies are prepared using the antigen (2).
[0198] 1. Antigen preparation: ApoE-ε4 peptides (1) and (2) were respectively linked with carrier protein KLH (keyhole limpet hemocyanin) (obtained from sigma company) by BDB (Bis-diazotizedbenzidine dichloride) method to prepare ApoE - ε4 antigen (1) and (2).
[0199] Take 10.0mg of ApoE-ε4 peptide (1) or (2), dissolve it with 1ml 0.1M PBS buffer (pH 7.4); dissolve 10mg of KLH with 20ml of 0.2M borate buffer (pH 9.0); then Mix the two, cool to 0°C, take BDBCl 2110 μL, reacted at room temperature for 1.5 h, dialyzed overnight, then aliquoted, and stored at -2...
Embodiment 3
[0214] Example 3: Specific Identification of Human ApoE-ε4 Monoclonal Antibody (1) and (2)
[0215] Detection was performed by ELISA. Human ApoE-ε4 protein, S-100B protein, and neuron-specific enolase NSE (all purchased from Shanghai Lianshuo Co., Ltd.) were used as detection antigens to coat ELISA plates, and the prepared ApoE-ε4 monoclonal clones were detected by ELISA respectively. For the specific reaction of antibodies (1) and (2) with the human ApoE-ε4 protein, normal BALB / c mouse serum was used as negative control, and PBS solution was used as blank control.
[0216] Results: ApoE-ε4 monoclonal antibodies (1) and (2) only react positively with ApoE-ε4 (P / N>2.1), but negatively react with S-100B protein and neuron-specific enolase NSE , indicating that the ApoE-ε4 monoclonal antibodies (1) and (2) of the present invention have specificity respectively.
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