ISO 5765-1 | IDF 79-1: 2002 - Dried milk, dried ice-mixes and processed cheese - Determination of lactose content - Part 1: Enzymatic method utilizing the glucose moiety of the lactose.This standard specifies an enzymatic method for the determination of the lactose content of all types of dried milk, of ice mixes in dry form in the presence of other carbohydrates and reducing substances, and of processed cheese.