相关实验视频

Updated: Jul 25, 2025

Detection of Bacteria Using Fluorogenic DNAzymes

Detection of Bacteria Using Fluorogenic DNAzymes

Published on: May 28, 2012

基于共价DNA的近红外光生物传感器

Justus T Metternich^1,2, Janus A C Wartmann¹, Linda Sistemich¹

¹Department of Chemistry, Ruhr-University Bochum, 44801 Bochum, Germany.

Journal of the American Chemical Society

|June 27, 2023

概括

我们开发了一种使用半导体单壁碳纳米管 (SWCNTs) 进行分子识别和信号传导的新共价方法.

科学领域:

材料科学
纳米技术
生物医学工程

背景情况:

半导体单壁碳纳米管 (SWCNT) 是用于生物传感的近红外 (NIR) 光体.
目前基于SWCNT的传感器的非共价修改方法在分子识别和信号可靠性方面存在局限性.
开发稳定可靠的SWCNT生物传感器需要改进表面功能化策略.

研究的目的:

为SWCNT引入一种新的共价功能化策略,以创建强大的NIR光生物传感器.
通过关氨酸量子缺陷的共价变化不会损害SWCNT的光.
为各种分析物开发特定和稳定的生物传感器建立一个多功能平台.

主要方法:

单链DNA (ssDNA) 探针与SWCNT的共价连接,使用关氨酸量子缺陷作为点.
使用ssDNA序列与互补的核酸进行杂交,作为捕获探针.
研究捕获探针长度对SWCNT光调节在杂交时的影响.
将额外的识别单元纳入 ssDNA 序列以提高传感器功能.

主要成果:

在不影响NIR光 (> 1000 nm) 的情况下,成功开发了一种新的共价化学方法来实现SWCNT功能化.
对SWCNTs的ssDNA探针进行DNA杂交导致显著的光调节,信号强度随探针长度增加 (20 > 10 ≫ 6个基).
共价策略为开发先进的NIR光生物传感器提供了增强的稳定性和通用途径.

结论:

共价关氨酸量子缺陷化学提供了一个合理的设计概念,用于创建基于SWCNT的稳定和多功能生物传感器.
这种方法克服了非对应方法的局限性,使得可靠的分子识别和信号传导成为可能.
开发的平台显示了检测临床相关点的潜力,例如细菌和SARS-CoV-2尖端蛋白.

更多相关视频

Synthesis of Wavelength-shifting DNA Hybridization Probes by Using Photostable Cyanine Dyes

Synthesis of Wavelength-shifting DNA Hybridization Probes by Using Photostable Cyanine Dyes

Published on: July 6, 2016

Author Spotlight: Advancements in DNA Nanosensors – Addressing Sensitivity and Selectivity Challenges in Molecular Detection

Author Spotlight: Advancements in DNA Nanosensors – Addressing Sensitivity and Selectivity Challenges in Molecular Detection

Published on: February 9, 2024

相关概念视频

Labeling DNA Probes

Labeling DNA Probes

DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...

FISH - Fluorescent In-situ Hybridization

FISH - Fluorescent In-situ Hybridization

Fluorescence in situ hybridization, or FISH, was developed in the early 1980s and has quickly become one of the most widely used techniques in cytogenetics. Labeled probes are used to bind complementary DNA or RNA sequences on a chromosome or in a region within a cell. Earlier, the probes could only be obtained by cloning or reverse transcription of a DNA template. Currently, the probe oligonucleotides can be synthesized synthetically. Additionally, with the advancement of optical techniques,...