Ratiometric Luminescent Detection of Bacterial Spores with Terbium Chelated Semiconducting Polymer Dots

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• 作者：Qiong Li ; Kai Sun ; Kaiwen Chang ; Jiangbo Yu ; Daniel T. Chiu ; Changfeng Wu ; Weiping Qin
• 刊名：Analytical Chemistry
• 出版年：2013
• 出版时间：October 1, 2013
• 年：2013
• 卷：85
• 期：19
• 页码：9087-9091
• 全文大小：292K
• 年卷期：v.85,no.19(October 1, 2013)
• ISSN：1520-6882

文摘

We report a ratiometric fluorescent sensor based on semiconducting polymer dots chelated with terbium ions to detect bacterial spores in aqueous solution. Fluorescent polyfluorene (PFO) dots serve as a scaffold to coordinate with lanthanide ions that can be sensitized by calcium dipicolinate (CaDPA), an important biomarker of bacterial spores. The absorption band of PFO dots extends to deep UV region, allowing both the reference and the sensitizer can be excited with a single wavelength (275 nm). The fluorescence of PFO remains constant as a reference, while the Tb³⁺ ions exhibit enhanced luminescence upon binding with DPA. The sharp fluorescence peaks of 尾-phase PFO dots and the narrow-band emissions of Tb³⁺ ions enable ratiometric and sensitive CaDPA detection with a linear response over nanomolar concentration and a detection limit of 0.2 nM. The Pdots based sensor also show excellent selectivity to CaDPA over other aromatic ligands. Our results indicate that the Tb³⁺ chelated Pdots sensor is promising for sensitive and rapid detection of bacterial spores.