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.

通过基于DNA的方法分析食品或饲料样品首先需要进行样品制备，然后再进行DNA提取。由于食物和饲料样品的种类繁多，因此必须对所遇到的基质进行调整。在认证计划中，审核员经常需要一个清晰的决策系统，使技术人员能够确定必须使用哪种方法来进行样品制备和DNA提取。在本文中，我们提出了一个识别键，可以轻松确定矩阵的类型和后续操作。提出的方法用于转基因生物分析的框架中，但可以扩展到适用于食品和饲料产品的多种其他基于DNA的方法。