Magnetic supercluster particles for highly sensitive magnetic biosensing of proteins.

Magnetic supercluster particles for highly sensitive magnetic biosensing of proteins.
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DOI:
10.1007/s00604-022-05354-x
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发表时间:
2022-06-14
期刊:
影响因子:
5.7
通讯作者:
Lee, Jung-Rok
Lee, Jung-Rok
中科院分区:
化学2区
文献类型:
--
作者:
Kim, Songeun;Kim, Junyoung;Im, Jisoo;Kim, Minah;Kim, Taehyeong;Wang, Shan X.;Kim, Dokyoon;Lee, Jung-Rok

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本文报道了一种通过增加生物传感器上磁标签的有效磁矩来提高当前巨磁电阻(GMR)生物传感器检测限的策略。利用湿化学技术制备了由~ 1000个超顺磁芯组成的磁性超团簇粒子(MSPs),并利用该粒子将GMR生物传感器对生物素作为靶分子的检测限提高到17.6 zmol。除信号换能器外,该值比使用同一组试剂进行的常规比色测定低4个数量级以上。MSPs在免疫分析中的适用性通过同时检测血管内皮生长因子(VEGF)和c反应蛋白(CRP)在双分析格式进一步证明。MSPs在信号强度和检测极限方面优于市售磁性纳米颗粒。在线版本包含补充材料,可在10.1007/s00604-022-05354-x获得。
A strategy is reported to improve the detection limits of current giant magnetoresistance (GMR) biosensors by augmenting the effective magnetic moment that the magnetic tags on the biosensors can exert. Magnetic supercluster particles (MSPs), each of which consists of ~ 1000 superparamagnetic cores, are prepared by a wet-chemical technique and are utilized to improve the limit of detection of GMR biosensors down to 17.6 zmol for biotin as a target molecule. This value is more than four orders of magnitude lower than that of the conventional colorimetric assay performed using the same set of reagents except for the signal transducer. The applicability of MSPs in immunoassay is further demonstrated by simultaneously detecting vascular endothelial growth factor (VEGF) and C-reactive protein (CRP) in a duplex assay format. MSPs outperform commercially available magnetic nanoparticles in terms of signal intensity and detection limit. The online version contains supplementary material available at 10.1007/s00604-022-05354-x.
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