该方法适用于谷物和谷物制品，以及某些粗纤维含量低于1%的产品。它包括用乙酸、硝酸和三氯乙酸的混合物煮沸（在任何必要的研磨和脱脂后）。然后在过滤坩埚上分离和洗涤不溶性残渣。干燥和称量不溶残渣，并测定焚烧时的质量损失。

The method is applicable to cereals and cereal products as well as to certain products containing less the 1 % of crude fibre. It consists in boiling with a mixture of acetic acid, nitric acid and trichloroacetic acid (after any necessary grinding and defatting). Then separation and washing of the insoluble residue on a filter crucible. Drying and weighing of the insoluble residue, and determination of the loss of mass on incineration.