Comparison of ICP-OES and GFAAS techniques for determination mineral content in wheat and wheat products matrix

Abstract

In modern society, it has become necessary that every food product possess nutritional label. One part of the nutritional value of food is micronutrients, especially minerals. They can be determined by different analytical techniques such as inductively coupled flame atomic absorption spectroscopy (FAAS), graphite furnace atomic absorption spectrometry (GFAAS), plasma-optical emission spectroscopy (ICP-OES) and inductively coupled plasma-mass-spectrometry (ICP MS). These techniques differ according to the number of elements that can be determined, the levels of determination, the number of samples that can be determined and the sample volume. Wheat contain substantial share of minerals iron (Fe) and Zinc (Zn). A lot of human population especially woman and children’s in poor countries suffers from deficient of these micronutrients. Therefore is necessary to measure their content in wheat and wheat products such as different kinds of bread that are staple food. Therefore, the aim of the study was to determine Fe and Zn in wheat grain and milling streams by GFAAS and ICP-OES to compare them.

U savremenom društvu postalo je neophodno da svaki prehrambeni proizvod ima nutritivnu oznaku. Jedan deo nutritivne vrednosti hrane čine mikronutrijenti, a pogotovo minerali. Oni se mogu odrediti različitim analitičkim tehnikama kao što je induktivno spregnuta plamena atomska apsorpciona spektroskopija (FAAS), atomska apsorpciona spektrometrija sa razaranjem uzorka u grafitnoj peći (GFAAS), plazma-optička emisiona spektroskopija (ICP-OES) i induktivno spregnuta plazma-masena spektrometrija (ICP-MS). Ove tehnike se razlikuju prema broju elemenata koje mogu odrediti, koncentraciji uzorka i broju uzoraka koji se mogu odrediti kao i zapremini uzorka koja je potrebna za analizu. Pšenica sadrži značajan udeo minerala gvožđa (Fe) i cinka (Zn). Veliki broj lјudi, posebno žena i dece u siromašnim zemlјama, pati od nedostatka ovih mikronutrijenata. Zbog toga je neophodno odrediti sadržaj ovih minerala u pšenici i pšeničnim proizvodima kao što su različite vrste hleba koji su osnovna hrana. Stoga je cilј studije bio da se pomoću GFAAS i ICP OES odredi sadržaj Fe i Zn u zrnu pšenice i proizvodima mlevenja kako bi se mogli uporediti rezultati dobijeni pomoću ove dve tehnike.