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A simple, low cost and fast sample preparation method for fluorine determination by ISE in leguminous seeds and oilseeds

2023; Elsevier BV; Volume: 429; Linguagem: Inglês

10.1016/j.foodchem.2023.136916

1873-7072

Paola Capernedo Crestani, Thiago Castanho Pereira, Eliana Torres Freitas Larruscain, Conrado R. Laureano, Érico M.M. Flores, Fábio A. Duarte,

Molecular Sensors and Ion Detection

This work presents the first report of the application of microwave-induced combustion in disposable vessels (MIC-DV) as a simple and fast sample preparation step for fluoride determination by ion-selective electrode (ISE) in leguminous seeds and oilseeds samples. Several experimental conditions of MIC-DV were evaluated, such as sample mass, absorbing solution, volume of combustion igniter, purging time with oxygen, and the use of successive combustion cycles. The accuracy of MIC-DV/ISE method was evaluated by comparing the results obtained by microwave-induced combustion and determination by ion chromatography, with agreements ranged from 94 to 106%. The method allowed to achieve relatively low limits of quantification (8.3 to 16 µg g-1) comparing to AOAC method (40 µg g-1), besides the use of small amounts of reagents, less handling of digests, making the method greener and with portable features comparing to other methods.