Verification of authenticity of apple juice

A series of instrumental analyses is described for verification of apple juice authenticity. Liquid chromatography is used to determine sugars and individual phenolics, atomic absorption spectroscopy is used to determine potassium, standard AOAC methods are used to test for polyphenolics and formol indexes, and stable carbon isotope ratio analysis (SCIRA) is used to detect high fructose corn syrup. These tests will identify fraudulent but not poorly processed apple juice.