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Human procalcitonin immunodetection kit, and preparation method and application thereof

A detection kit, a technology for human calcitonin, applied in the biological field, can solve the problems of insufficient detection sensitivity, long reaction time, expensive experimental instruments, etc.

Active Publication Date: 2015-07-22
DYNAMIKER BIOTECH TIANJIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) Gel method, this method is troublesome and difficult to form automatic detection;
[0007] (2) Enzyme-linked immunosorbent assay, the traditional ELISA method has complex detection operations, long reaction time and low sensitivity;
[0008] (3) Radioimmunoassay, which has a long reaction time, unstable test results, poor repeatability, and radioactive contamination problems;
[0009] (4) Immunoluminescence method, which has strong specificity and high sensitivity, but requires expensive experimental instruments;
[0010] (5) colloidal gold chromatography, this method has low sensitivity, can only be qualitative but cannot be quantitatively detected by experiment;
This kind of product adopts two-step method in the detection, and the detection speed is slow, which leads to long detection time, and the detection accuracy is also insufficient; and this kind of method usually uses PCT monoclonal antibody or polyclonal antibody, and the detection sensitivity is insufficient. It is often impossible to establish a standard curve with good linearity at lower concentrations, resulting in the inability to detect lower concentrations of PCT test samples

Method used

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  • Human procalcitonin immunodetection kit, and preparation method and application thereof
  • Human procalcitonin immunodetection kit, and preparation method and application thereof
  • Human procalcitonin immunodetection kit, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0114] Embodiment 1: the preparation of PCT antigen

[0115] (1) Take 1 mg PCT full-length antigen;

[0116] (2) Prepare 2ml of enzymatic solution: Prohormone Convertase (PC), Carboxypeptidase (CP), Aminopeptidase (AP), Pepeitdyl Glycine Amidating Monooxygenase (Pepeitdyl Glycine Amidating Monooxygenase) -oxygenase, PAM) each 30IU / g dissolved in 20mM Tris, 500mM NaCl, pH7.4 buffer.

[0117] (3) Add enzymatic hydrolysis solution, enzymatic hydrolysis in water bath at 37°C for 2 hours;

[0118] (4) Separately couple three monoclonal antibodies against N-terminal (N-proCT), calcitonin (CT) and calcitonin (Katacalcin, KAT) antigens to the chromatographic column, and enzymatically digest The solution was sequentially filtered for affinity purification to obtain three antigens: N-terminal (N-proCT), calcitonin (CT) and anti-procalcitonin (Katacalcin, KAT). The specific steps are as follows:

[0119] a The above antibodies were bound to protein A microbeads respectively. 2 mg of ...

Embodiment 2

[0130] Example 2, detection of PCT epitope peptides

[0131] Specific identification of immune response to PCT antigen polypeptide by Western blot: take the final purified procalcitonin polypeptide for 15% SDS-PAGE identification, and use the anti-PCT monoclonal antibody produced by Abcam to perform western blot analysis on it, using Millipore Immobilon The Western Chemiluminescent HRP Subscrate system developed the color, and the results showed that a clear band can be seen where the anti-PCT monoclonal antibody binds to the PCT protein.

Embodiment 3

[0132] Embodiment 3, the preparation of PCT epitope peptide antigen

[0133] The related antigen obtained in Example 1 is coupled with related macromolecular substances to improve its immunogenicity: the PCT N-terminal (N-proCT), calcitonin (Calcitonin, CT) and calcitonin (Katacalcin, KAT) is coupled with latex microspheres, KLH, BSA, GST, etc., and part of the coupling needs to add a cross-linking agent to promote the improvement of its cross-linking rate. The obtained antigenic polypeptide fragments can be used to immunize animals.

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Abstract

The invention provides a human procalcitonin immunodetection kit, comprising: an enzyme-labeled plate coated by PCT monoclonal multi-antibody; at least two PCT standard reagent bottles, wherein each of the PCT standard reagent bottles is filled with a PCT standard substance of a different concentration; and an enzyme-labeled reagent bottle which is filled with the enzyme-labeled PCT monoclonal multi-antibody. The immunodetection kit provided by the invention has good sensitivity and specificity; the results of the kit highly accord with the results of a reference reagent; the kit can provide accurate and reliable detections, is simple and easily practicable to operate and is rapid and sensitive in detection; a microplate reader used in the invention is simple and popular; and the kit provides an effective tool for detection of human procalcitonin.

Description

technical field [0001] The invention relates to a detection method for human procalcitonin, in particular to a vde immune detection kit, belonging to the biological field. Background technique [0002] Procalcitonin (PCT) is a calcitonin propeptide substance without hormone activity, a glycoprotein with a molecular mass of 13kD, consisting of 116 amino acids, including N-residue, calcitonin, and calcitonin. 1-57 are N-stumps, 60-92 are calcitonin, and 96-116 are calcitonin. Since 1996, PCT has been used as a new type of differential diagnosis tool for the diagnosis of bacterial infection and its secondary complications. In terms of the diagnosis of such diseases as sepsis, septic shock and severe systemic inflammatory reactions, and the follow-up observation of the process, PCT diagnosis It has obvious advantages and high specificity. The sepsis diagnostic criteria of the International Sepsis Conference in 2001 has already used PCT as one of the diagnostic indicators. In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/68G01N33/531
CPCG01N33/531G01N33/68
Inventor 周泽奇
Owner DYNAMIKER BIOTECH TIANJIN
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