Abstract
Abstract Phenolic amines tyramine, octopamine, synephrine, β-methoxyoctopamine, and β-methoxysynephrine are isolated on a cation exchange resin and quantitatively determined by GLC of their trifluoroacetyl derivatives. Recoveries of 80–85% for tyramine and 90–100% for the four other phenolic amines were obtained for standards and for standards added to orange or apple juices. Phenolic amines were not detected in commercial apple juices. Synephrine was found in all commercial orange juice samples at levels of 12.5 to 23.4 mg/L juice. Another component, apparently a phenolic amine, was found in all orange juices examined.
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