Study on determination of pyrroloquinoline quinine derivatives in various foods

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In the present study, we examined the determination of pyrroloquinoline quinone(PQQ) derivatives in various foods that are commonly consumed daily. The samples were analyzed using efficient extraction, accurate identification and quantification followed by high performance liquid chromatography-tandem mass spectrometry. The PQQ amino acid derivatives were identified with low concentration in various foods. The imidazopyrroloquinoline concentrations ranged from several ng/g-several hundred ng/g(or ml); other PQQ derivatives were in the range of several ng/g or ml.