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用于生物成像应用的近红外共振和非共振拉曼报告基团的多重检测潜力。

Multiplexing potential of NIR resonant and non-resonant Raman reporters for bio-imaging applications.

机构信息

Department of Biomedical Engineering, University of Southern California, 3650 McClintock Ave, Los Angeles, CA 90089, USA.

USC Michelson Center for Convergent Bioscience, University of Southern California, 1002 Childs Way, Los Angeles, CA 90089, USA.

出版信息

Analyst. 2023 Nov 20;148(23):5915-5925. doi: 10.1039/d3an01298k.

Abstract

Multiplexed imaging, which allows for the interrogation of multiple molecular features simultaneously, is vital for addressing numerous challenges across biomedicine. Optically unique surface-enhanced Raman scattering (SERS) nanoparticles (NPs) have the potential to serve as a vehicle to achieve highly multiplexed imaging in a single acquisition, which is non-destructive, quantitative, and simple to execute. When using laser excitation at 785 nm, which allows for a lower background from biological tissues, near infrared (NIR) dyes can be used as Raman reporters to provide high Raman signal intensity due to the resonance effect. This class of imaging agents are known as surface-enhanced resonance Raman scattering (SERRS) NPs. Investigators have predominantly utilized two classes of Raman reporters in their nanoparticle constructs for use in biomedical applications: NIR-resonant and non-resonant Raman reporters. Herein, we investigate the multiplexing potential of five non-resonant SERS: BPE, 44DP, PTT, PODT, and BMMBP, and five NIR resonant SERRS NP flavors with heptamethine cyanine dyes: DTTC, IR-770, IR-780, IR-792, and IR-797, which have been extensively used for biomedical imaging applications. Although SERRS NPs display high Raman intensities, due to their resonance properties, we observed that non-resonant SERS NP concentrations can be quantitated by the intensity of their unique emissions with higher accuracy. Spectral unmixing of five-plex mixtures revealed that the studied non-resonant SERS NPs maintain their detection limits more robustly as compared to the NIR resonant SERRS NP flavors when introducing more components into a mixture.

摘要

多重成像技术可以同时检测多种分子特征,对于解决生物医学领域的众多挑战至关重要。光学独特的表面增强拉曼散射(SERS)纳米颗粒(NPs)有可能成为在单次采集实现高度多重成像的载体,这种方法是非破坏性的、定量的,且易于执行。当使用允许来自生物组织的背景更低的 785nm 激光激发时,可以将近红外(NIR)染料用作拉曼报告物,由于共振效应,提供高的拉曼信号强度。这类成像剂被称为表面增强共振拉曼散射(SERRS) NPs。研究人员主要利用两类拉曼报告物在其纳米颗粒构建体中用于生物医学应用:NIR 共振和非共振拉曼报告物。在此,我们研究了五种非共振 SERS 的多重成像潜力:BPE、44DP、PTT、PODT 和 BMMBP,以及五种 NIR 共振 SERRS NP 风味的七甲川氰染料:DTTC、IR-770、IR-780、IR-792 和 IR-797,这些染料已广泛用于生物医学成像应用。尽管 SERRS NPs 显示出高的拉曼强度,但由于其共振特性,我们观察到非共振 SERS NP 浓度可以通过其独特发射的强度更准确地定量。五种混合物的光谱解混表明,与 NIR 共振 SERRS NP 风味相比,所研究的非共振 SERS NPs 在混合物中引入更多成分时,其检测限更稳健。

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