A Highly Sensitive Immunochromatographic Strip Test for Rapid and Quantitative Detection of Saikosaponin d

Author: Zhang Yue   Xiao Wei   Kong Hui   Cheng Jinjun   Yan Xin   Zhang Meiling   Wang Qingguo   Qu Huihua   Zhao Yan  

Publisher: MDPI

E-ISSN: 1420-3049|23|2|338-338

ISSN: 1420-3049

Source: Molecules, Vol.23, Iss.2, 2018-02, pp. : 338-338

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Abstract

A quantitative lateral-flow immunoassay using gold nanoparticles (AuNPs) conjugated with a monoclonal antibody (MAb) against saikosaponin d (SSd) was developed for the analysis of SSd. The AuNPs were prepared in our laboratory. The AuNPs were polyhedral, with an average diameter of approximately 18 nm. We used the conjugation between AuNPs and MAbs against SSd to prepare immunochromatographic strips (ICSs). For the quantitative experiment, the strips with the test results were scanned using a membrane strip reader, and a detection curve (regression equation, y = −0.113ln(x) + 1.5451, R2 = 0.983), representing the averages of the scanned data, was obtained. This curve was linear from 96 ng/mL to 150 μg/mL, and the IC50 value was 10.39 μg/mL. In this study, we bring the concept of POCT (point-of-care testing) to the measurement of TCM compounds, and this is the first report of quantitative detection of SSd by an ICS.

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