1 research outputs found
Antibody-Free Colorimetric Detection of Total Aflatoxins in Rice Based on a Simple Two-Step Chromogenic Reaction
The prevalently used immunoassays
for fast screening of aftatoxins
(AFs) usually cannot meet the requirement for simultaneous determination
of total AFs (aflatoxin B<sub>1</sub> + aflatoxin B<sub>2</sub> +
aflatoxin G<sub>1</sub> + aflatoxin G<sub>2</sub>) due to the deficiency
of highly group-specific antibodies. This paper describes a two-step
chromogenic reaction based method to quantitatively detect total AFs
in rice using colorimetric measurement without antibody. In the method,
colorless AFs transform into green-colored indophenol products through
the reaction with sodium hydroxide and 2,6-dibromoquinone-4-chloroimide
(DBQC) successively, allowing selectively determining total AFs up
to 3.9 μg/kg over other competitive mycotoxins under optimal
conditions by a UV–vis spectrophotometer. In addition, the
colorimetric measurement results of the rice samples agree well with
that of a standard HPLC method, demonstrating the good reliability
and applicability of the method. Uniquely, the method has potential
for on-site detection of total AFs in rice when using a nylon membrane-based
device