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Determination of Total Aflatoxin Using Cysteamine-Capped Cds Quantum Dots As a Fluorescence Probe Publisher



Tayebi M1 ; Tavakkoli Yaraki M1 ; Ahmadieh M1 ; Tahriri M2, 3, 4 ; Vashaee D5 ; Tayebi L2, 6
Authors
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Authors Affiliations
  1. 1. Department of Chemical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
  2. 2. Marquette University School of Dentistry, Milwaukee, 53233, WI, United States
  3. 3. Dental Biomaterials Department, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
  4. 4. Biomaterials Group, Faculty of Biomedical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
  5. 5. Electrical and Computer Engineering Department, North Carolina State University, Raleigh, 27606, NC, United States
  6. 6. Department of Engineering Science, University of Oxford, Oxford, OX1 3PJ, United Kingdom

Source: Colloid and Polymer Science Published:2016


Abstract

Aflatoxins form a class of potent carcinogens that contaminate a wide range of food products and can be fatal to humans and livestock. We have designed cysteamine-capped CdS quantum dots (QDs) to serve as aflatoxin photodetectors for use in agricultural industries. Water-soluble CdS QDs are synthesized through growth in a poly(vinyl alcohol) matrix using a chemical precipitation method. The prepared QDs are then characterized with X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), dynamic light scattering (DLS), and transmission electron microscopy (TEM) analyses. The obtained results revealed that these CdS QDs have a 1- to 2-nm crystalline size, hexagonal wurtzite structure, and spherical morphology with a diameter less than 10 nm. Photoluminescence spectroscopy (PL) is performed to study the CdS QDs interactions with a standard solution of aflatoxins (B1, B2, G1, and G2 in a ratio of 5:1:5:1) in order to determine their effectiveness as aflatoxin detectors. A green emission peak is observed at 508 nm, with an intensity enhancement positively correlated with total aflatoxin concentration. The lower limit of detection for total aflatoxin concentration is found to be 0.05 ppb, well below international contamination allowances for food products. PL variations with aflatoxin concentration are best described by a Langmuir-type equation in the concentration range of this study (2.4–48 ppb). © 2016, Springer-Verlag Berlin Heidelberg.
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