Identification key for selection of the matrix type to which a sample belongs within the context of GMO analysis

Analysis of food or feed samples by DNA-based methods first needs a sample preparation before DNA extraction. Due to the large variety of types of food and feed samples, methods must be adapted to the matrices encountered. Within an accreditation scheme, auditors frequently require a clear decision system enabling the technical staff to determine which method has to be used to perform the sample preparation and the DNA extraction. In this paper, we present an identification key that easily determines the type of matrix and the subsequent operations. The method presented is used in the framework of GMO analysis but could be extended to a wide variety of other DNA-based methods applied to food and feed products.