A single-molecule protein detection chip and method based on ultramicroelectrode array electrochemiluminescence
A protein detection and single-molecule technology, which is applied in the direction of material analysis, measuring devices, and scientific instruments through electromagnetic means, can solve the problems of unstable reaction process, complex device preparation, and high difficulty of preparation, so as to improve the capture rate and uniformity , fast and sensitive response to signals, and the effect of improving detection sensitivity
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Embodiment 1
[0085] Example 1 Preparation of immune complex-modified microbeads and ruthenium-labeled functionalization
[0086] In order to ensure that each microbead binds at most one single-molecule protein and increase the intensity of electrochemiluminescence, an immune complex modified microbead and ruthenium-labeled functionalization method were designed. It mainly includes carboxylated microbeads activated by carbodiimide-N-hydroxysuccinimide (EDC-NHS) coupled with primary antibody, bovine serum albumin (BSA) blocks the immune active site, captures the target protein in the sample and Combined with ruthenium-labeled secondary antibody to form immune complex modified microbeads:
[0087] Specifically:
[0088] 1) 2.8 μm magnetic microbeads modified with carboxyl groups (10mL solution contains 6×10 8 ~7×10 8 microbeads) as the carrier to carry out sufficient carboxylation on the outside of the chip;
[0089] Prepare N-hydroxysuccinimide (NHS) with phosphate buffer (0.01M, pH 7.4)...
Embodiment 2
[0093] Example 2 Design and preparation of a single-molecule protein detection chip
[0094] Design the specific structure of the single-molecule protein detection chip (see image 3 ): The basic microwell structural unit used to accommodate 2.8 μm microbeads is a semi-elliptical inclined groove microwell. axis, the inclination angle of the chute, etc., to construct the standard elliptic equation; the semi-major axis of the semi-ellipse is a, the semi-minor axis is b, and the inclination angle of the chute is α. According to the calculation, its size requirements need to meet the standard Ellipse equation:
[0095]
[0096] x and y are the coordinates of any point on the semi-ellipse, and the length of the semi-major axis of the semi-ellipse is a, then we can know a according to the formula 2 =4R 2 / sin 2 α, the length of the semi-minor axis is b, then it can be known that b is calculated according to the formula 2 =4R 2 The tilt angle of the / 3 tilted microwell is α,...
Embodiment 3
[0099] Embodiment 3 Research on the Specific Dimensions of the Microwell Array Unit
[0100] Firstly, it is determined that the SU-8 inclined microwell array prepared on the ITO electrode is 4000 rows × 20 columns, and the potential difference at both ends of a single microwell depends on the ratio of the length of the microwell to the distance between the two copper wires. When the potential difference is large enough, an oxidation or reduction reaction occurs on the electrode surfaces at both ends of the microwell, causing electrochemiluminescence. The highest potential is obtained when the drop point of the microbead is close to the semi-short axis. Therefore, the specific dimensions of the designed microwell array unit are 10 μm in the semi-major axis and 1.6 μm in the semi-minor axis. When an external voltage is applied across the ITO electrodes and a solution exists in the microwell array, a potential gradient is generated due to resistance. Because the resistance of t...
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