tailieunhanh - Analysis of Pesticides in Food and Environmental Samples - Chapter 7

Các chất ô nhiễm hữu cơ hiện diện trong thực phẩm nguồn gốc động vật có thể được phân loại vào hai lớn loại: chất gây ô nhiễm và dư lượng. Chất gây ô nhiễm (ví dụ, dioxin hay polychlorinated biphenyls) là những chất thêm vào đó là cố ý không để các loại thực phẩm và đó có thể nhập vào thực phẩm của họ TRONG quá trình sản xuất, chế biến, bảo quản, đóng gói, | 7 Determination of Pesticides in Food of Animal Origin Antonia Garrido Frenich Jose Luis Martinez and Adrian Covaci CONTENTS Introduction. 177 Sample Sample Extraction Techniques. 187 Cleanup and Fractionation. 190 Analytical Techniques. 191 Gas Chromatography. 191 Enantioselective Gas Chromatography. 193 Liquid Chromatography. 194 Immunoassays. 195 Electroanalytical Techniques. 196 Internal Quality Control. 196 Basic Activities of IQC in Pesticide Analysis. 196 Internal Quality Control Measures . 197 Application to Real Samples . 198 Organochlorine Pesticides . 198 Organophosphorus Pesticides . 199 Other Pesticides. 199 Emerging Issues in Analytical Acknowledgments. 201 INTRODUCTION Organic pollutants present in foods of animal origin can be classified into two large categories contaminants and residues. Contaminants . dioxins or polychlorinated biphenyls are substances that are not added deliberately to the foods and that can enter into foods during their production process transformation storage packed 2007 by Taylor Francis Group LLC. transport or fraudulent practices. Residues are compounds that can occur in foodstuffs as a consequence of intentional usage of phytosanitary or veterinary products during plant or animal production. Therefore pesticides found incorporated or onto the surface of foods belong to the residues group. Pesticides are a group of chemicals used either to directly control pest populations or to prevent or reduce pest damage on crops landscape or animals. In consequence pesticides may be present in fresh or processed animal foods if animals have been fed with contaminated feed or water or from practices involving pesticides in places where animals are living stables beehives or in food-processing factories. Pesticides are classified into several classes according to the .