Electrochemical immunosensor electric signal marker for prostate specific antigen detection and detection method
A prostate-specific, immunosensor technology, applied in the detection of prostate-specific antigen, electrochemical immunosensor signal markers for prostate-specific antigen detection and the detection field, can solve the problems of high cost, instability, difficult preparation, etc., and reduce the threshold of entities , convenient detection, obvious effect of electrical signal
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Embodiment 1
[0031] Example 1: Preparation of secondary antibody / carbon nanotube / protease complex
[0032] A1: Pretreatment of carbon nanotubes;
[0033] 20 mg of multi-walled carbon nanotubes were boiled with 50 mL of 2 M nitric acid for 12 hours, cooled and washed by centrifugation three times at 14,000 rpm for 5 minutes each time. Then heat the centrifuged multi-walled carbon nanotubes in 50 mL of nitric acid / sulfuric acid (volume ratio 1:3) mixed solution for 12 hours at a temperature of 60-120°C, then centrifuge and wash several times until the pH is close to 7, and finally The centrifuge is vacuum-dried to obtain shorter carbon nanotubes;
[0034] A2: Preparation of secondary antibody / carbon nanotube / protease complex;
[0035] Add the carbon nanotubes (1.5 mg) obtained in A1 into 1 mL of MES buffer solution, sonicate for 30 minutes, then add 1 mL of MES (pH 7.4, 10 mM) buffer solution containing 0.4 M EDC and 0.1 M NHS, and centrifuge. Discard the excess EDC and NHS, add 150 μL of...
Embodiment 2
[0036] Example 2: Activity Analysis of Secondary Antibody / Carbon Nanotube / Protease Complex
[0037] Mix 5 μL of the secondary antibody / carbon nanotube / protease complex obtained in step A2 with 100 μL of PBS buffer solution (pH 7.4, 0.2 M) containing 2 mM polypeptide GARGGH, and react at room temperature for 1 hour, then wash the reaction solution with PBS without 0.5 mM copper ions was diluted to 500 μL, and then centrifuged at 14,000 rpm. The supernatant was tested by mass spectrometry. The test model of mass spectrometry was negative ion model. From figure 2 It can be seen that the synthesized secondary antibody / carbon nanotube / protease complex can catalyze the hydrolysis of the polypeptide GARGGH, and the main peak at 268.1035 Da is the mass spectrum peak of the hydrolyzed product GGH ( figure 2 ), which indicated that trypsin modified to carbon nanotubes could catalyze the hydrolysis of polypeptide GARGGH; when copper ions were added, a new mass spectrum peak appeared a...
Embodiment 3
[0038] Example 3: Sensor Response to Prostate Specific Antigen
[0039] B: Preparation of working electrode
[0040] B1: Carboxylated graphene was modified on the surface of the glassy carbon electrode, that is, 5 μL of 0.5 mg / mL carboxylated graphene solution was dropped onto the surface of the glassy carbon electrode with a diameter of 3 mm, and dried naturally;
[0041] B2: Preparation of the primary antibody-modified electrode, that is, soak the electrode obtained in B1 in PBS buffer solution containing 0.4 M EDC and 0.1 M NHS for 15 minutes, rinse the surface of the electrode with secondary water, and dry it with nitrogen; then 10 μL The primary antibody was dripped onto the surface of the electrode, and after reacting for 2 hours, rinse the electrode with secondary water, then soak the electrode in PBS solution containing 0.1% BSA (w / v) for 30 minutes, take out the electrode, and rinse the electrode surface with secondary water, Blow dry with nitrogen;
[0042] B3: To ...
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