Plasmonic colorimetry and G-quadruplex fluorescence-based aptasensor: A dual-mode, protein-free and label-free detection for OTA
文献类型: 外文期刊
作者: Ming Li;Youxin Qiu;Guoxing Liu;Yu Xiao;Ye Tian;Song Fang
作者机构:
关键词: Dual-mode detection;G-quadruplex;Gold nanoparticle;Ochratoxin A;Surface plasmon resonance
期刊名称: Food Chemistry
ISSN: 0308-8146
年卷期: 2024 年 448 卷
页码:
收录情况: SCIE(2024版) ; ; EI(2024版)
摘要: G-quadruplexes (G4) have received significant attention in the field of aptasensors owing to their unique physicochemical characteristics. A dual-mode, protein-free and label-free aptamer sensor based on plasmonic colorimetry and G4 fluorescence (PC@GF-aptasensor) was proposed for ochratoxin A (OTA). Colorimetry mode was achieved through the surface plasmon resonance (SPR) effect, which related to the OTA-Apt-based G4–OTA. The fluorescence mode was reflected by the insertion of thioflavin T (ThT) into G4–OTA. The OTA could be interpreted via three readouts: (1) naked eye (LOD of 2.0 ng mL−1), (2) smartphone (LOD of 1.65 ng mL−1), and (3) spectrofluorometer (LOD of 0.93 ng mL−1). The PC@GF-aptasensor exhibited several advantages, such as a standardised recognition group, simplified operation, low background signal, and practicality. The proposed PC@GF-aptasensor integrated SPR-based multicolour interpretation and ThT-inserted fluorescence reflection to obtain a dual-mode optical biosensor, which may provide valuable insights for the development of other targets with G4-based aptamers.
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