Colorimetric Analysis of Ochratoxin A in Beverage Samples.
This manuscript describes the use of a portable and low cost fluorescence setup to quantify the concentration of ochratoxin A (OTA) in beverage samples using an in-house developed system and different color models. It is reported that OTA is naturally fluorescent, for that reason an ultraviolet light at 365 nm was used to excite the samples and a Complementary Metal Oxide Semiconductor (CMOS) sensor was used to get a photograph of the OTA under excitation conditions, which is controlled by an executable interface designed in MATLAB. For each concentration of OTA, the coordinates with respect to each model color were obtained and plotted to quantify the mycotoxin present in the sample. It was possible to observe that despite the fact no extraction column was employed, the Red, Green, Blue (RGB) model shows a proportional relation to the evaluated concentrations. Despite the fact more analysis and other methods are required to quantify the OTA concentration, the brightness and a,b for the color-opponent dimensions (L*a*b) and Hue, Saturation, Value (HSV) tests provide results whereby it is possible to identify the concentration of OTA in beverage samples such as beer and wine.
Bioelectronics Section, Department of Electrical Engineering, CINVESTAV-IPN, Mexico City 07360, Mexico. dbueno@cinvestav.mx.|Université de Perpignan Via Domitia, BAE, Building S 52 Av. Paul Alduy, Perpignan Cedex 66860, France. dbueno@cinvestav.mx.
Diana
D
Bueno
Bioelectronics Section, Department of Electrical Engineering, CINVESTAV-IPN, Mexico City 07360, Mexico. fvaldez@cinvestav.mx.
Luis F
LF
Valdez
Bioelectronics Section, Department of Electrical Engineering, CINVESTAV-IPN, Mexico City 07360, Mexico. mgutierrez@cinvestav.mx.
Juan Manuel
JM
Gutiérrez Salgado
Université de Perpignan Via Domitia, BAE, Building S 52 Av. Paul Alduy, Perpignan Cedex 66860, France. jlmarty@univ-perp.fr.
Jean Louis
JL
Marty
Bioelectronics Section, Department of Electrical Engineering, CINVESTAV-IPN, Mexico City 07360, Mexico. rmunoz@cinvestav.com.
Roberto
R
Muñoz
D001515:Beer / Q000032:analysis; D001628:Beverages / Q000032:analysis*; D003124:Colorimetry / Q000379:methods*; D009793:Ochratoxins / Q000032:analysis*; D014920:Wine / Q000032:analysis
D009793:Ochratoxins; C025589:ochratoxin A
CIELab; CIEXYZ; HSV; OTA; RGB; YCbCr; beer; model color; wine