Biosensing by Direct Observation of Leaky Waveguide Modes

Biosensing by Direct Observation of Leaky Waveguide Modes
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通过直接观察泄漏波导模式进行生物传感

DOI:
10.1088/1742-6596/1919/1/012002
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发表时间:
2021
期刊:
Conference Series
影响因子:
--
通讯作者:
Gupta R
Gupta R
中科院分区:
--
文献类型:
--
作者:
Gupta R

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在折射率比覆盖层高0.001-0.01的波导中,用楔形光束照射时,可以直接观察到泄漏波导的谐振角为指数衰减的干涉条纹。这项工作首次表明,这样的LWs可以实现使用丙烯酰胺与N-(3-氨丙基)甲基丙烯酰胺盐酸盐(APMA)共聚的水凝胶。以聚乙二醇二丙烯酸酯(PEGDA,Mn:700Da)交联4.5%丙烯酰胺/APMA制成的LWs对100 kDa和300 kDa的典型生物分子具有约59%和约56%的孔率,因此被选择用于以蛋白A-生物素(PAB)为生物分子识别元件的免疫球蛋白G(IgG)的生物传感。丙烯酰胺/APMA LW对IgG的检测限为3.69±0.37 nM,这至少是本工作中使用的PAB-IgG结合配偶体的解离常数的1/100。未来的工作将探讨丙烯酰胺/APMA LW的临床相关分析物的生物传感的应用。
The resonance angles of leaky waveguides (LWs) can be observed directly as exponentially decaying interference fringes in waveguides with refractive index that is 0.001–0.01 higher than cover, and when illuminated with wedge-shaped light beam. This work for the first time shows that such LWs can be realised using hydrogels of acrylamide copolymerised with N-(3-aminopropyl) methacrylamide hydrochloride (APMA). LWs made of 4.5%(w: v) acrylamide/APMA crosslinked with poly (ethylene glycol) diacrylate (PEGDA, M n: 700Da) were∼ 59% and∼ 56% porous to 100kDa and 300kDa species, which are typical molecular weights of biomolecules, and hence were selected for biosensing of immunoglobulin G (IgG) with protein A–biotin (PAB) as biomolecular recognition element. The limit of detection of the acrylamide/APMA LW for IgG was 3.69±0.37 nM, which is at least 1/100 th of the dissociation constant of the PAB-IgG binding partners used in this work. Future work will investigate the application of acrylamide/APMA LW for biosensing of clinically relevant analytes.
DOI: 10.1016/j.snb.2020.127776
发表时间: 2020-04-15
影响因子: 8.4
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发表时间: 2010-11-22
期刊: OPTICS EXPRESS
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DOI: 10.1039/c3an36714b
发表时间: 2013
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影响因子: --
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