生物传感器
费斯特共振能量转移
荧光
适体
光子上转换
分析物
检出限
化学
胶体金
纳米传感器
生物物理学
纳米技术
纳米颗粒
材料科学
分子生物学
发光
生物化学
生物
光电子学
色谱法
物理
量子力学
作者
Ling Yang,Chun‐Tao Che,Mengfan Guo,Chunhai Fan,Lina Sun,Shanshan Chen
出处
期刊:ACS omega
[American Chemical Society]
日期:2024-11-12
卷期号:9 (47): 47156-47166
被引量:3
标识
DOI:10.1021/acsomega.4c07608
摘要
MicroRNAs (miRNAs), a class of small molecules with important regulatory functions, have been widely used in biosensing as biomarkers for the early diagnosis of various diseases (such as osteoporosis). Therefore, it is necessary to develop a miRNA detection platform with high sensitivity and specificity. Herein, an upconversion biosensor based on fluorescent resonant energy transfer (FRET) for the detection of miRNAs was developed. Gold nanoparticles (AuNPs, fluorescence acceptors) were conjugated with aptamers, while upconversion nanoparticles (UCNPs, fluorescence donors) were functionalized with the corresponding complementary DNA (cDNA). The upconversion luminescence (UCL) is quenched vis FRET due to the good overlap between UCNP fluorescence emission and AuNP absorption. In the presence of the target miRNA, the aptamers preferentially bind to the miRNA, thereby dissociating the UCNP-cDNA from the AuNP-aptamers, resulting in the recovery of the UCL. The UCL recovery efficiency increased in a miRNA concentration-dependent manner, which supported the principle of miRNA quantification. The UCNP-based FRET biosensor exhibited sensitive detection of miRNA-21 (as a model analyte) with low limit of detection of 5.91 pM. In addition, depending on the near-infrared excitation and a simple complementary binding reaction during the detection process, the designed biosensor not only effectively eliminated the autofluorescence but also reduced the detection time.
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