A magnetic bead array-based fluorescence immunoassay platform for robust cancer biomarker analysis in clinical blood samples

IF 2.3 4区 工程技术 Q2 INSTRUMENTS & INSTRUMENTATION Microfluidics and Nanofluidics Pub Date : 2024-04-29 DOI:10.1007/s10404-024-02728-w
Jieung Oh, Ho-Seong Han, Hyundoo Hwang, Joo H. Kang
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Abstract

The reliable conjugation of antibodies to a solid matrix is crucial for robust immunoassays in microfluidic devices. Various magnetic particles (MPs) have been employed due to their high surface-to-volume ratios and ease of magnetic manipulation, providing a reliable surface for antibody immobilization. However, achieving uniform positioning of MPs across the channel surface has been challenging due to inadequate magnetic forces or magnetic field uniformity. Here, we present the utilization of Halbach magnetic arrays to enable consistent deployment of MPs on the microfluidic surface, thereby facilitating robust immunoassay capabilities. Using finite element method magnetics (FEMM) simulations, we predicted that incorporating Halbach magnetic arrays beneath the microfluidic channels would create more uniform and augmented magnetic flux density gradients over the surface. Subsequently, we applied this platform to assess cancer biomarkers in patients’ blood plasma and achieved statistically reliable results, comparable to those obtained using an FDA-approved device. We detected three cancer biomarkers, including prostate-specific antigen (PSA), alpha-fetoprotein (AFP), and carcinoembryonic antigen (CEA). The limit of detection (LOD) of three biomarkers were < 1 ng/mL, ranging from 0.38–0.95 ng mL−1. This platform provided within-run, between-run, and between-day precisions for the three cancer biomarkers, ranging from 0.37–9.87%. This advancement holds significant promise for improving the accuracy and performance of immunoassays in various microfluidic diagnostic applications.

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基于磁珠阵列的荧光免疫分析平台,用于临床血液样本中癌症生物标记物的可靠分析
抗体与固体基质的可靠结合对于在微流控装置中进行稳健的免疫测定至关重要。各种磁性颗粒(MPs)因其高表面体积比和易于磁性操作而被广泛使用,为抗体固定提供了可靠的表面。然而,由于磁力不足或磁场不均匀,要在通道表面实现 MPs 的均匀定位一直是个挑战。在此,我们介绍利用哈尔巴赫磁阵列在微流体表面实现 MPs 的一致部署,从而促进强大的免疫测定功能。利用有限元法磁学(FEMM)模拟,我们预测在微流控通道下方安装哈尔巴赫磁阵列可在表面形成更均匀的增强磁通密度梯度。随后,我们将这一平台用于评估患者血浆中的癌症生物标志物,并取得了统计上可靠的结果,与使用美国食品及药物管理局批准的设备所取得的结果相当。我们检测了三种癌症生物标记物,包括前列腺特异性抗原(PSA)、甲胎蛋白(AFP)和癌胚抗原(CEA)。三种生物标记物的检测限(LOD)均为1纳克/毫升,范围为0.38-0.95纳克毫升-1。该平台为三种癌症生物标记物提供了运行内、运行间和日间精确度,精确度范围为 0.37-9.87%。这一进步为提高各种微流控诊断应用中免疫测定的准确性和性能带来了巨大希望。
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来源期刊
Microfluidics and Nanofluidics
Microfluidics and Nanofluidics 工程技术-纳米科技
CiteScore
4.80
自引率
3.60%
发文量
97
审稿时长
2 months
期刊介绍: Microfluidics and Nanofluidics is an international peer-reviewed journal that aims to publish papers in all aspects of microfluidics, nanofluidics and lab-on-a-chip science and technology. The objectives of the journal are to (1) provide an overview of the current state of the research and development in microfluidics, nanofluidics and lab-on-a-chip devices, (2) improve the fundamental understanding of microfluidic and nanofluidic phenomena, and (3) discuss applications of microfluidics, nanofluidics and lab-on-a-chip devices. Topics covered in this journal include: 1.000 Fundamental principles of micro- and nanoscale phenomena like, flow, mass transport and reactions 3.000 Theoretical models and numerical simulation with experimental and/or analytical proof 4.000 Novel measurement & characterization technologies 5.000 Devices (actuators and sensors) 6.000 New unit-operations for dedicated microfluidic platforms 7.000 Lab-on-a-Chip applications 8.000 Microfabrication technologies and materials Please note, Microfluidics and Nanofluidics does not publish manuscripts studying pure microscale heat transfer since there are many journals that cover this field of research (Journal of Heat Transfer, Journal of Heat and Mass Transfer, Journal of Heat and Fluid Flow, etc.).
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