适体
碳二亚胺
化学
共价键
赭曲霉毒素A
检出限
分析物
组合化学
纳米技术
色谱法
材料科学
真菌毒素
有机化学
分子生物学
食品科学
生物
作者
Mingzhen Zhu,Liang Feng
标识
DOI:10.1016/j.snb.2022.132859
摘要
Ochratoxin A (OTA) is the most common mycotoxin contaminant that is widely distributed in food products. Herein, a sensitive and rapid sensing platform was constructed based on triple-helix molecular switch and CMC-EDC/NHS covalent immobilized paper. The aptamer-based triple-helix molecular switch (THMS) released signal transduction probe (STP) upon the addition of OTA, which was then enriched on the TR512-peptide functionalized paper modified with CMC-EDC/NHS chemistry. The sensing platform achieved a lower detection limit of 0.012 ng/mL with the linear range of 0.025–100 ng/mL. Notably, the sensing could be finished in less than 15.5 min without complex concentration process or expensive equipment. Additionally, the TR512-peptide based fusion protein was strongly-immobilized on the paper substrate via carbodiimide coupling, which prevented the fusion protein from leaching and enabled a large amount of solution molecules to bind with the fusion protein (up to 1 mL). Finally, a full-set of device was developed and applied in real samples with good accuracy. Taken together, the sensing platform integrating THMS with functionalized paper possesses practical application prospects in food samples and may offer a new protocol for the detection of multifarious target analytes by virtue of altering the aptamer sequence in THMS.
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