Impact of amino acid availability on the protein digestibility corrected amino acid score

A significant change in the assessment of dietary protein quality occurred with the introduction of the protein digestibility corrected amino acid score (PDCAAS).PDCAAS combines traditional chemical scoring of a protein with a biological assessment of AA availability. This paper focuses on several issues relating to determining the availability of AAs in a protein. The impact of using ileal versus faecal, and true versus real digestibility coefficients to assess protein quality is discussed.