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This paper describes the application of two techniques, ANAA and PIXE, used in the analyses of some availa- ble commercial food containing regular and genetically modified ingredients, as well as soybens cultivated with regular and genetically modified seeds (GMS). The aim of this work is determine their elemental composition to perform a comparative analysis. The elemental composition results of both types of food, obtained by the two techniques, were in agreement for all elements. Our results show the same elemental composition for all food samples but the quantitative analysis between soybeans seeds (regular and GM) suggested that the product made with GMS have higher concentration values, mainly for Cl, P and Zn, while for industrialized food, made with genetically modified products, a low concentration values were measured for most of the elements. The importance of essential elements to human health has stimulated the analysis of their occurrence in a wide variety of foodstuffs. In the early 80's, the first experiment involving the transgenic vegetables gave rise to the research on gene- tically modified food (GMF) production. Since then, some benefits in cellular biology as well as in agriculture were ob- tained. The knowledge obtained permits production of vege- tables with modified quantities of lipids and proteins in se- eds, virus and plagues resistance and also allows cultivation on salty soils and swamps. According to recent statistics, about 60% of world population consumes GMF and almost 22 million acres are cultivated with transgenic species in the world. Particularly, the analysis related to GMF consumed by the Brazilian population is important due to an increase in its consumption. Considering the increasing demand of GMF and the new developments related to its world produc- tion, in the beginning of the 90's the Organization for Econo- mic Cooperation and Development (1) established the concept of substantial equivalence (2, 3) to be used as a guide for safe evaluation of GMF. Since then, this guide has been implemen- ted by the Food and Agriculture Organization (3-5), together with many other regulatory agencies in several countries, in- cluding the European Commission. The purpose of this study is to check the elemental composition of food containing ge- netically modified ingredients as well as soybeans cultivated with regular and GMS to perform a comparative analyses, al- lowing to verify if there are significant modifications in their elemental composition.

Multielemental analysis of genetically modified food using ANAA and PIXE techniques