ISO 21571:2005提供了DNA提取/纯化和定量的一般要求和具体方法。附件A和B中描述了这些方法。 ISO 21571:2005适用于食品基质，但也适用于其他基质，如谷物和饲料。 它被设计为基于核酸的分析方法的一个组成部分，特别是关于定性分析方法的ISO 21569和关于定量分析方法的ISO 21570。

ISO 21571:2005 provides general requirements and specific methods for DNA extraction/purification and quantification. These methods are described in Annexes A and B. ISO 21571:2005 has been established for food matrices, but could also be applicable to other matrices, such as grains and feed. It has been designed as an integral part of nucleic-acid-based analytical methods, in particular ISO 21569 on qualitative analytical methods, and ISO 21570 on quantitative analytical methods.