Details

Autor(en) / Beteiligte

• Long, Ruiqing
• Li, Te
• Tong, Chaoying
• Wu, Lihui
• Shi, Shuyun

Titel

Molecularly imprinted polymers coated CdTe quantum dots with controllable particle size for fluorescent determination of p-coumaric acid

Ist Teil von

• Talanta (Oxford), 2019-05, Vol.196, p.579-584

Ort / Verlag

Netherlands: Elsevier B.V

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A facile and sensitive fluorescent sensor based on coating molecularly imprinted polymers onto the surface of CdTe quantum dots (CdTe-QDs@MIPs) was successfully fabricated for selective determination of p-coumaric acid (pCA) for the first time by the strategy of charge transfer principle. MIPs layer was synthesized by one-pot sol-gel reaction using 3-(aminopropyl) triethoxysilane (APTES) as functional monomer and tetraethyl orthosilicate (TEOS) as crosslinker. Controllable particle size of CdTe-QDs@MIPs was formed by simply adjusting the polymerization time. Smaller particle size (about 56 nm) at polymerization time of 5 min reduced embedded sites, and then resulted in fast response (within only 4 min), and high sensitivity (limit of detection, LOD low to 6.74 μg L−1) for pCA. Different parameters during synthesis and determination procedures affecting the fluorescent probe were optimized. The fluorescent intensity of CdTe-QDs@MIPs was remarkably quenched by pCA compared to CdTe-QDs@NIPs with an imprinting factor of 27.0. Finally, the fluorescence quenching analysis showed excellent linear ranges from 20 to 1000 μg L−1 (R2, 0.9964) with distinguished selectivity, and batch-to-batch relative standard deviation (RSD) was 3.8%. The proposed method was applied successfully for the determination of pCA in pineapple juice and kiwi juice with satisfactory recoveries from 92.7% to 106.0%, and precisions below 8.1%. The proposed fluorescent sensor exhibited simple and rapid preparation and detection procedures, high sensitivity and excellent selectivity. It is envisioned that the resultant CdTe-QDs@MIPs offered a new way of rapid and sensitive analysis of pCA in real complex samples. [Display omitted] •CdTe-QDs@MIPs probe was developed for the detection of p-coumaric acid.•Particle size increased linearly with the increasing of polycondensation time.•Small particle size favored fast response and high sensitivity.•CdTe-QDs@MIPs exhibited high specificity and sensitivity for p-coumaric acid.•The probe was applied for the detection of p-coumaric acid in fruit juices.