Journal
ANALYTICA CHIMICA ACTA
Volume 1284, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.aca.2023.341990
Keywords
miRNA detection; Metal-organic framework; Biomacromolecules; Luminescent biosensing; Fluorescence quenching
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A portable, sensitive, and stable sensing platform based on a smartphone was developed to detect miRNA. The platform utilized a photoinduced electron transfer process to quench fluorescence, enabling sensitive detection of miRNA with a detection limit of 0.32 pM, even distinguishable by the naked eye. Furthermore, the platform demonstrated high selectivity and accurate analysis of miRNA expression levels in cancer cell samples.
MicroRNAs (miRNAs) are important biomacromolecules used as biomarkers for the diagnosis of several diseases. However, current detection strategies are limited by expensive equipment and complicated procedures. Here, we develop a portable, sensitive, and stable (Eu-MOF)-based sensing platform to detect miRNA via smartphone. The Eu-MOF absorbs the carboxyfluorescein (FAM)-tagged probe DNA (pDNA) to generate hybrid pDNA@Eu-MOF, which can efficiently quench the fluorescence of FAM through a photoinduced electron transfer (PET) process. When integrated with a smartphone, the nonemissive pDNA@ Eu-MOF hybrid could be utilized as a portable and sensitive platform to sense miRNA (miR-892b) with a detection limit of 0.32 pM, which could be even distinguished by the naked eye. Moreover, this system demonstrates high selectivity for identifying miRNA family members with single-base mismatches. Furthermore, the expression levels of miRNA in cancer cell samples could be analyzed accurately. Therefore, the proposed method offers a promising guideline for the design of MOFbased sensing strategies and expands their potential applications for diagnostic purposes.
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