Development of a C-reactive Protein Quantification Method Based on Flow Rate Measurement of an Ink Solution Pushed out by Oxygen Gas Generated by Catalase Reaction

Overview

Journal Mikrochim Acta

Specialties Biotechnology
Chemistry

Date 2023 Dec 13

PMID 38091091

Authors

Kuizhi Qu

Kazuhiro Morioka

Konoka Nakamura

Shoji Yamamoto

Akihide Hemmi

Atsushi Shoji

Hizuru Nakajima

Affiliations

Soon will be listed here.

Abstract

A novel determination method for protein biomarkers based on on-chip flow rate measurement was developed using a microchip with organic photodiodes (OPDs). This quantitative method is based on the flow rate measurement of an ink solution pushed out by oxygen gas generated through catalase reaction. The amount of oxygen gas generated in the sample reservoir is dependent on the concentration of the analyte; therefore, the flow rate of the ink solution is also dependent on the concentration of the analyte. The concentration of the analyte can thus be estimated by measurement of the ink solution flow rate. The ink solution flow rate was estimated by measuring the migration time of the ink solution between two points using two OPDs placed below the microchannel. The principle of this method was demonstrated by the measurement of catalase using the microchip. In addition, the developed method was applied to the determination of C-reactive protein (CRP), a biomarker of inflammation, based on a catalase-linked immunosorbent assay (C-LISA). The limit of detection for CRP was 0.20 µg/mL. The method was also applied to the determination of CRP in human serum, and the quantitative values obtained by this method were in excellent agreement with those obtained by the conventional enzyme-linked immunosorbent assay (ELISA) method. The developed method does not require a photodetector with high sensitivity and is thus capable of downsizing; therefore, this will be useful for on-site analyses such as point-of-care testing and field measurements.

Citing Articles

Overview of Gas-Generating-Reaction-Based Immunoassays.

Yu Z, Deng D, Liang S, Huang Y, Yi X Biosensors (Basel). 2024; 14(12.

PMID: 39727844 PMC: 11726966. DOI: 10.3390/bios14120580.

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