The distribution pattern of 3',5'-cyclic adenosine monophosphate(cAMP) during the production of concentrated apple juice was investigated. HPLC was employed to determine the cAMP content in apple pomace left after juice extraction with water or aqueous ethanol and in concentrated apple juice. The change trend of cAMP content in concentrated apple juice was analyzed as a function of dilution factor and soluble solid content. Distribution coefficient(DCcAMP) was calculated to describe the distribution regular...