Determination of total aflatoxin using cysteamine-capped CdS quantum dots as a fluorescence probe

Mahnoush Tayebi; Mohammad Tavakkoli Yaraki; Mahnaz Ahmadieh; Mohammadreza Tahriri; Daryoosh Vashaee; Lobat Tayebi

doi:10.1007/s00396-016-3903-x

Determination of total aflatoxin using cysteamine-capped CdS quantum dots as a fluorescence probe

Mahnoush Tayebi, Mohammad Tavakkoli Yaraki^*, Mahnaz Ahmadieh, Mohammadreza Tahriri^*, Daryoosh Vashaee, Lobat Tayebi

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

31 Citations (Scopus)

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).

Original language	English
Pages (from-to)	1453-1462
Number of pages	10
Journal	Colloid and Polymer Science
Volume	294
Issue number	9
DOIs	https://doi.org/10.1007/s00396-016-3903-x
Publication status	Published - Sept 2016
Externally published	Yes

Keywords

CdS QDs
Aflatoxin
Photoluminescence
Cysteamine
Determination

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10.1007/s00396-016-3903-x

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title = "Determination of total aflatoxin using cysteamine-capped CdS quantum dots as a fluorescence probe",

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).",

keywords = "CdS QDs, Aflatoxin, Photoluminescence, Cysteamine, Determination",

author = "Mahnoush Tayebi and {Tavakkoli Yaraki}, Mohammad and Mahnaz Ahmadieh and Mohammadreza Tahriri and Daryoosh Vashaee and Lobat Tayebi",

year = "2016",

month = sep,

doi = "10.1007/s00396-016-3903-x",

language = "English",

volume = "294",

pages = "1453--1462",

journal = "Colloid and Polymer Science",

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AU - Tayebi, Mahnoush

AU - Tavakkoli Yaraki, Mohammad

AU - Ahmadieh, Mahnaz

AU - Tahriri, Mohammadreza

AU - Vashaee, Daryoosh

AU - Tayebi, Lobat

PY - 2016/9

Y1 - 2016/9

N2 - 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).

AB - 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).

KW - CdS QDs

KW - Aflatoxin

KW - Photoluminescence

KW - Cysteamine

KW - Determination

U2 - 10.1007/s00396-016-3903-x

DO - 10.1007/s00396-016-3903-x

M3 - Article

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VL - 294

SP - 1453

EP - 1462

JO - Colloid and Polymer Science

JF - Colloid and Polymer Science

IS - 9

ER -

Determination of total aflatoxin using cysteamine-capped CdS quantum dots as a fluorescence probe

Abstract

Keywords

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