Partial least-squares with residual bilinearization for the spectrofluorimetric determination of pesticides. A solution of the problems of inner-filter effects and matrix interferents

The Analyst ◽  
2006 ◽  
Vol 131 (9) ◽  
pp. 1012 ◽  
Author(s):  
Gisela N. Piccirilli ◽  
Graciela M. Escandar
Keyword(s):  
Least Squares ◽  
Partial Least Squares ◽  
Spectrofluorimetric Determination ◽  
Inner Filter Effects ◽  
Filter Effects

scholarly journals Simultaneous Determination of Pesticides in Fruits by Using Second-Order Fluorescence Data Resolved by Unfolded Partial Least-Squares Coupled to Residual Bilinearization

2018 ◽  
Vol 2018 ◽  
pp. 1-17 ◽  
Author(s):  
Mercedes Villar Navarro ◽  
Miguel Angel Cabezón ◽  
Patricia C. Damiani
Keyword(s):  
Least Squares ◽  
Simultaneous Determination ◽  
Partial Least Squares ◽  
Multivariate Calibration ◽  
Second Order ◽  
World Health ◽  
Official Control ◽  
Inner Filter Effects ◽  
Filter Effects

In the present work, a chemometric-assisted spectrofluorimetric method has been developed for the simultaneous determination of natural fluorescent pesticides, carbaryl, carbendazim, and thiabendazole, in orange and banana. Only a simple extraction with methanol was required as sample pretreatment. Emission-excitation fluorescence matrices were obtained and resolved by using a second-order multivariate calibration method based on unfolded partial least-squares combined with residual bilinearization (U-PLS/RBL) for achieving “second-order advantage.” In this way, pesticides were determined in fruits even in the presence of inner filter effects, background interactions, strong spectral overlapping, and unexpected components. U-PLS can cope with effects that cause trilinearity loss such as, inner filter effects, including background in the calibration set; meanwhile, RBL allows to resolve the presence of unexpected components. The extraction technique was validated against a commonly applied technique based on the use of ethyl acetate and sodium sulfate. Besides, results obtained for real samples were statistically compared with those obtained by using HPLC. LODs of 0.038, 0.054, and 0.018 mg·kg−1 and 0.044, 0.072, and 0.020 mg·kg−1 were obtained for carbaryl, carbendazim, and thiabendazole in banana and orange samples, respectively; values were in accordance with the MRLs (Maximum Residue Limits) established by different official control organizations such as National Food Safety and Quality Service (SENASA), Codex Alimentarius (based on Food and Agriculture Organization (FAO) of the United Nations and World Health Organization (WHO), and Environmental Protection Agency (EPA).

Second-Order Advantage Achieved by Unfolded-Partial Least-Squares/Residual Bilinearization Modeling of Excitation−Emission Fluorescence Data Presenting Inner Filter Effects

2006 ◽  
Vol 78 (23) ◽  
pp. 8051-8058 ◽  
Author(s):  
Diego Bohoyo Gil ◽  
Arsenio Muñoz de la Peña ◽  
Juan A. Arancibia ◽  
Graciela M. Escandar ◽  
Alejandro C. Olivieri
Keyword(s):  
Least Squares ◽  
Partial Least Squares ◽  
Second Order ◽  
Inner Filter Effects ◽  
Filter Effects
Sign in / Sign up

Export Citation Format

Share Document