Carbon dots coated with vitamin B-12 as selective ratiometric nanosensor for phenolic carbofuran

• Type: Article in International Scientific Journal
• Date: 2017

Authors

Campos, BB (Author) Other; Contreras Caceres, R (Author) Other; Bandosz, TJ (Author) Other; Jimenez Jimenez, J (Author) Other; Rodriguez Castellon, E (Author) Other; Joaquim C G E Esteves da Silva (Author) FCUP; Algarra, M (Author) Other

Journal

Title: Sensors and Actuators, B: Chemical

Vol. 239

Pages: 553-561

ISSN: 0925-4005

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 44 Citations

Scopus - 47 Citations

Other information

Authenticus ID: P-00K-RWJ

DOI: 10.1016/j.snb.2016.08.055

Abstract (EN): A carbon quantum dots (CQDs) based ratiometric nanosensor exhibiting dual emission fluorescence was developed. The spherical fluorescent carbon nanoparticles were obtained from lactose using a hydrothermal method. Under a single excitation at 355 nm they showed the typical blue emission at 417 nm and a red emission at 550 nm attributed to the coating effect of vitamin B-12. The latter is explained by the fluorescence resonance energy transfer (FRET) and it consists of 61% of total emission. Upon the presence of carbofuran phenol 3-Keto, a phenolic metabolite of carbofuran, the red emission was quenched, resulting in a ratiometric fluorescence response in the blue range. This ratiometric nanosensor exhibited a good selectivity to carbofuran phenol 3-Keto. The ratio of I-412/I-550 linearly decreased with an increasing carbofuran phenol 3-Keto concentration in the range 9.8 mu M-1.40 x 10(-4) M. A detection limit for carbofuran phenol 3-Keto pesticide was 12.2 mu M. The pesticide tested was extracted from soy sauce. Recovery values ranged from 98% to 114% with RSD values from 1.50% to 6.50%.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9